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e2holmes's library 96 articles

 
 

ICES datch data

  [CiTO]
posted to data time_series by e2holmes on 2011-03-02 03:25:01 **
 

JISAO Climate data links

  [CiTO]
posted to data time_series by e2holmes on 2011-03-02 03:23:33 **
 

A comparison of models for predicting population persistence

  [CiTO]
Ecological Modelling In Management, Control and Decision Making for Ecological Systems, Vol. 201, No. 1. (10 February 2007), pp. 19-26, doi:10.1016/j.ecolmodel.2006.07.018

Abstract

We consider a range of models that may be used to predict the future persistence of populations, particularly those based on discrete-state Markov processes. While the mathematical theory of such processes is very well-developed, they may be difficult to work with when attempting to estimate parameters or expected times to extinction. Hence, we focus on diffusion and other approximations to these models, presenting new and recent developments in parameter estimation for density dependent processes, and the calculation of extinction times for ...

 

Flawed population viability analysis can result in misleading population assessment: A case study for wolves in Algonquin park, Canada

  [CiTO]
Biological Conservation, Vol. 141, No. 3. (March 2008), pp. 669-680, doi:10.1016/j.biocon.2007.12.010

Abstract

For many populations and species, population viability analysis (PVA) plays a critical role in developing defensible conservation strategies and recovery plans. Although technical aspects of PVA have been well scrutinized, misapplication of PVA and misinterpretation of its results have received less attention. To illustrate potential hazards of improper use of PVA we reanalyzed data from a recent study on viability of wolves in Algonquin Provincial Park (APP), Ontario, Canada. The original PVA predicted extirpation of wolves from APP and prompted both ...

 

Reliability of Absolute and Relative Predictions of Population Persistence Based on Time Series

  [CiTO]
Conservation Biology, Vol. 18, No. 5. (2004), pp. 1224-1232, doi:10.1111/j.1523-1739.2004.00285.x

Abstract

Conventional population viability analysis (PVA) is often impractical because data are scarce for many threatened species. For this reason, simple count-based models are being advocated. The simplest of these models requires nothing more than a time series of abundance estimates, from which variance and autocorrelation in growth rate are estimated and predictions of population persistence are generated. What remains unclear, however, is how many years of data are needed to generate reliable estimates of these parameters and hence reliable predictions of ...

 

Risk-Based Viable Population Monitoring Monitoreo de Poblaciones Viables con Base en Riesgos

  [CiTO]
Conservation Biology, Vol. 19, No. 6. (December 2005), pp. 1908-1916, doi:10.1111/j.1523-1739.2005.00283.x
posted to assessment exponential_growth_model extinction forecasting population prediction_intervals pva random_walk risk_prediction by e2holmes  on 2010-01-11 21:49:26 read along with 1 person sviscido

Abstract

We describe risk-based viable population monitoring, in which the monitoring indicator is a yearly prediction of the probability that, within a given timeframe, the population abundance will decline below a prespecified level. Common abundance-based monitoring strategies usually have low power to detect declines in threatened and endangered species and are largely reactive to declines. Comparisons of the population's estimated risk of decline over time will help determine status in a more defensible manner than current monitoring methods. Monitoring risk is a ...

 

Noise and determinism in synchronized sheep dynamics

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Nature, Vol. 394, No. 6694. (13 August 1998), pp. 674-677, doi:10.1038/29291
posted to moran_effect spatial_autocorrelation spatial_synchrony by e2holmes on 2010-01-06 00:32:11 **

Abstract

A major debate in ecology concerns the relative importance of intrinsic factors and extrinsic environmental variations in determining population size fluctuations1, 2, 3, 4, 5, 6. Spatial correlation of fluctuations in different populations caused by synchronous environmental shocks2,7,8 is a powerful tool for quantifying the impact of environmental variations on population dynamics8,9. However, interpretation of synchrony is often complicated by migration between populations8,10. Here we address this issue by using time series from sheep populations on two islands in the St ...

 

The Moran effect: a cause of population synchrony

  [CiTO]
Trends in Ecology & Evolution, Vol. 14, No. 1. (1 January 1999), pp. 1-2, doi:10.1016/s0169-5347(98)01498-0
posted to spatial_autocorrelation spatial_synchrony by e2holmes on 2010-01-06 00:29:37 **
 

Dispersal, Environmental Correlation, and Spatial Synchrony in Population Dynamics

  [CiTO]
The American Naturalist, Vol. 155, No. 5. (2000), pp. 628-636, doi:10.2307/3078985
posted to spatial_autocorrelation spatial_synchrony by e2holmes on 2010-01-06 00:22:30 **

Abstract

Many species exhibit widespread spatial synchrony in population fluctuations. This pattern is of great ecological interest and can be a source of concern when the species is rare or endangered. Both dispersal and spatial correlations in the environment have been implicated as possible causes of this pattern, but these two factors have rarely been studied in combination. We develop a spatially structured population model, simple enough to obtain analytic solutions for the population correlation, that incorporates both dispersal and environmental correlation. ...

 

SPATIAL SYNCHRONY IN POPULATION DYNAMICS*

  [CiTO]
Annual Review of Ecology, Evolution, and Systematics, Vol. 35, No. 1. (2004), pp. 467-490, doi:10.1146/annurev.ecolsys.34.011802.132516
posted to spatial_autocorrelation spatial_synchrony by e2holmes on 2010-01-06 00:02:06 **

Abstract

▪ Abstract  Spatial synchrony refers to coincident changes in the abundance or other time-varying characteristics of geographically disjunct populations. This phenomenon has been documented in the dynamics of species representing a variety of taxa and ecological roles. Synchrony may arise from three primary mechanisms:(a) dispersal among populations, reducing the size of relatively large populations and increasing relatively small ones; (b) congruent dependence of population dynamics on a synchronous exogenous random factor such as temperature or rainfall, a phenomenon known as the ...

 

Spatial Autocorrelation: Trouble or New Paradigm?

  [CiTO]
Ecology, Vol. 74, No. 6. (September 1993), pp. 1659-1673, doi:10.2307/1939924
posted to spatial_autocorrelation spatial_synchrony by e2holmes  on 2010-01-06 00:01:34 ** along with 10 people and 1 group aidankeane dekay23 dmajka falkogl gr650 liucun mcwimberly noamross renreff sunjinguf GeospatialAnalysis

Abstract

Autocorrelation is a very general statistical property of ecological variables observed across geographic space; it most common forms are patches and gradients. Spatial autocorrelation, which comes either from the physical forcing of environmental variables or from community processes, presents a problem for statistical testing because autocorrelated data violate the assumption of independence of most standard statistical procedures. The paper discusses first how autocorrelation in ecological variables can be described and measured, with emphasis on mapping techniques. Then, proper statistical testing in ...

 

Estimating environmental effects on population dynamics: consequences of observation error

  [CiTO]
Oikos, Vol. 118, No. 5. (2009), pp. 675-680, doi:10.1111/j.1600-0706.2008.17250.x

Abstract

Within the paradigm of population dynamics a central task is to identify environmental factors affecting population change and to estimate the strength of these effects. We here investigate the impact of observation errors in measurements of population densities on estimates of environmental effects. Adding observation errors may change the autocorrelation of a population time series with potential consequences for estimates of effects of autocorrelated environmental covariates. Using Monte Carlo simulations, we compare the performance of maximum likelihood estimates from three stochastic ...

 

Generalized Hierarchical Multivariate CAR Models for Areal Data

  [CiTO]
Biometrics, Vol. 61, No. 4. (December 2005), pp. 950-961, doi:10.1111/j.1541-0420.2005.00359.x
 

Time-series modeling of fishery landings using ARIMA models and Fuzzy Expected Intervals software

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Environmental Modelling & Software, Vol. 21, No. 12. (December 2006), pp. 1711-1721, doi:10.1016/j.envsoft.2005.09.001
 

The extended Moran effect and large-scale synchronous fluctuations in the size of great tit and blue tit populations

  [CiTO]
Journal of Animal Ecology, Vol. 76, No. 2. (March 2007), pp. 315-325, doi:10.1111/j.1365-2656.2006.01195.x
posted to spatial_synchrony time_series by e2holmes on 2009-01-29 21:46:16 **
 

A web resource for the UK's long-term individual-based time-series (LITS) data

  [CiTO]
Journal of Animal Ecology, Vol. 77, pp. 612-617
posted to data time_series by e2holmes on 2009-01-29 21:43:06 **
 

Complexity in Ecology and Conservation: Mathematical, Statistical, and Computational Challenges

  [CiTO]
BioScience, Vol. 55 (2005), pp. 501-510
posted to correlated_noise by e2holmes on 2009-01-29 21:23:56 **
 

Population synchrony in ecological systems

  [CiTO]
Population Ecology, Vol. 50, No. 4. (1 October 2008), pp. 325-327, doi:10.1007/s10144-008-0107-3
posted to spatial_synchrony by e2holmes on 2009-01-29 21:13:58 **
 

Synchrony of spatial populations: heterogeneous population dynamics and reddened environmental noise

  [CiTO]
Population Ecology, Vol. 51, No. 1. (1 January 2009), pp. 221-226, doi:10.1007/s10144-008-0121-5

Abstract

Abstract  Many species exhibit widespread spatial synchrony in population fluctuations. This pattern is of great ecological interest and can be a source of concern when a species is rare or endangered. Moran’s theorem suggests that if two (or more) populations sharing a common linear density-dependence in the renewal process are disturbed with correlated noise, they will become synchronized with correlation matching the noise correlation. In this report, correlation of nonidentical populations that are described by linear and stationary autoregressive processes is analyzed. ...

 

Improving light and temperature based geolocation by unscented Kalman filtering

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Fisheries Research, Vol. 91, No. 1. (May 2008), pp. 15-25, doi:10.1016/j.fishres.2007.11.002
posted to kalman_filter tracking by e2holmes on 2009-01-29 20:54:21 ** along with 1 person pleizier

Abstract

Tracking marine animals with electronic tags has become an indispensable tool in understanding biology in relation to movement. Combining light based geolocation estimates with an underlying movement model has proved helpful in reconstructing the most probable track of tagged animals. These tracks can be further improved by including the tag measured sea-surface temperature and matching it to external sea-surface temperature (SST) data. The current methodology for doing this in a state-space model requires that external sea-surface temperature be smoothed before it ...

 

Spatially-correlated extinction in a metapopulation model of Leadbeater's Possum

  [CiTO]
Biodiversity and Conservation, Vol. 9, No. 1. (1 January 2000), pp. 47-63, doi:10.1023/a:1008953426795
posted to extinction metapopulation spatial by e2holmes on 2008-03-19 19:20:38 ** along with 1 person MaxPer

Abstract

The importance of considering spatially-correlated extinction in metapopulation viability analyses was investigated using a model of the population dynamics of Gymnobelideus leadbeateri McCoy (Leadbeater's Possum). Fire caused local extinction of G. leadbeateri and induced changes in the suitability of the habitat over a period of decades and centuries. Spatially-correlated fires, in which the correlation between the incidence of fire declines with distance, and uniformly-correlated fires were simulated. The predicted risk of metapopulation extinction increased: (i) as the variance in the number ...

 

Influence of coloured noise on the extinction risk in structured population models

  [CiTO]
Biological Conservation, Vol. 110, No. 3. (April 2003), pp. 315-325, doi:10.1016/s0006-3207(02)00235-5
posted to correlated_noise extinction population_dynamics by e2holmes on 2008-03-19 19:19:11 **

Abstract

We use simple models to compare extinction risk among basic life history types when environmental noise is either uncorrelated ("white") or positively autocorrelated ("red"). The metric of extinction is probability of extinction in 50 years; variability of noise is scaled such that its expected variance is independent of colour at this time scale. We compare annual, semelparous biennial, iteroparous biennial and perennial life histories. Given an identical equilibrium population size and basic reproductive number, annual life history confers much higher extinction ...

 

How to find a metapopulation

  [CiTO]
Canadian Journal of Zoology, Vol. 85, No. 10. (1 October 2007), pp. 1031-1048
posted to metapopulation by e2holmes on 2008-03-19 04:20:21 ** along with 2 people GLaugier MaxPer

Note (first note only)

this reviews methods for analyzing spatial data in order to discern metapopulation structure.

 

Metapopulation Extinction Risk under Spatially Autocorrelated Disturbance

  [CiTO]
Conservation Biology, Vol. 19, No. 2. (April 2005), pp. 534-546, doi:10.1111/j.1523-1739.2005.00418.x
posted to extinction metapopulation spatial by e2holmes on 2008-03-19 04:07:39 ** along with 1 person MaxPer
 

Metapopulation dynamics of the bog fritillary butterfly: modelling the effect of habitat fragmentation

  [CiTO]
Acta Oecologica, Vol. 23, No. 5. (October 2002), pp. 287-296, doi:10.1016/s1146-609x(02)01157-8
posted to extinction fragmentation metapopulation by e2holmes on 2008-03-19 04:05:36 **

Abstract

Population viability analysis (PVA) and metapopulation theory are valuable tools to model the dynamics of spatially structured populations. In this article we used a spatially realistic population dynamic model to simulate the trajectory of a Proclossiana eunomia metapopulation in a network of habitat patches located in the Belgian Ardenne. Sensitivity analysis was used to evaluate the relative influence of the different parameters on the model output. We simulated habitat loss by removing a percentage of the original habitat, proportionally in each ...

 

Comparative Evaluation of Experimental Approaches to the Study of Habitat Fragmentation Effects

  [CiTO]
Ecological Applications, Vol. 12, No. 2. (2002), pp. 335-345

Abstract

Ecologists have used a variety of comparative mensurative and manipulative experimental approaches to study the biological consequences of habitat fragmentation. In this paper, we evaluate the merits of the two major approaches and offer guidelines for selecting a design. Manipulative experiments rigorously assess fragmentation effects by comparing pre- and post-treatment conditions. Yet they are often constrained by a number of practical limitations, such as the difficulty in implementing large-scale treatments and the impracticality of measuring the long-term (decades to centuries) responses ...

 

Effect of Habitat Fragmentation on the Extinction Threshold: A Synthesis

  [CiTO]
Ecological Applications, Vol. 12, No. 2. (2002), pp. 346-353

Abstract

I reviewed and reconciled predictions of four models on the effect of habitat fragmentation on the population extinction threshold, and I compared these predictions to results from empirical studies. All four models predict that habitat fragmentation can, under some conditions, increase the extinction threshold such that, in more fragmented landscapes, more habitat is required for population persistence. However, empirical studies have shown both positive and negative effects of habitat fragmentation on population abundance and distribution with about equal frequency, suggesting that ...

 

Ecological Principles and Guidelines for Managing the Use of Land

  [CiTO]
Ecological Applications, Vol. 10, No. 3. (2000), pp. 639-670
posted to conservation fragmentation by e2holmes  on 2008-03-19 03:47:30 ** along with 1 person and 1 group dekay23 Permaculture

Abstract

The many ways that people have used and managed land throughout history has emerged as a primary cause of land-cover change around the world. Thus, land use and land management increasingly represent a fundamental source of change in the global environment. Despite their global importance, however, many decisions about the management and use of land are made with scant attention to ecological impacts. Thus, ecologists' knowledge of the functioning of Earth's ecosystems is needed to broaden the scientific basis of decisions ...

 

Habitat fragmentation and extinction thresholds on fractal landscapes

  [CiTO]
Ecology Letters, Vol. 2, No. 2., pp. 121-127
posted to extinction fragmentation metapopulation spatial by e2holmes on 2008-03-19 03:40:25 **

Abstract

Habitat fragmentation is a potentially critical factor in determining population persistence. In this paper, we explore the effect of fragmentation when the fragmentation follows a fractal pattern. The habitat is divided into patches, each of which is suitable or unsuitable. Suitable patches are either occupied or unoccupied, and change state depending on rates of colonization and local extinction. We compare the behaviour of two models: a spatially implicit patch-occupancy (PO) model and a spatially explicit cellular automaton (CA) model. The PO ...

 

Connectivity, Fragmentation, and Extinction Risk in Dendritic Metapopulations

  [CiTO]
Ecology, Vol. 83, No. 12. (2002), pp. 3243-3249
posted to extinction metapopulation spatial by e2holmes on 2008-03-19 03:18:51 read

Abstract

Neither linear nor two-dimensional frameworks may be the most appropriate for fish and other species constrained to disperse within river-creek systems. In particular, the hierarchical, dendritic structures of riverine networks are not well captured by existing spatial models. Here I use a simple geometric model and metapopulation modeling to make three points concerning the ecological consequences of dendritic landscapes. First, connectivity patterns of river-creek networks differ from linear landscapes, and these differences in connectivity can either enhance or reduce metapopulation persistence ...

 

Bootstrapping State-Space Models: Gaussian Maximum Likelihood Estimation and the Kalman Filter

  [CiTO]
Journal of the American Statistical Association, Vol. 86, No. 416. (1991), pp. 1024-1033
posted to kalman_filter maximum_likelihood state-space by e2holmes on 2008-02-06 01:22:55 **

Abstract

The bootstrap is proposed as a method for assessing the precision of Gaussian maximum likelihood estimates of the parameters of linear state-space models. Our results also apply to autoregressive moving average models, since they are a special case of state-space models. It is shown that for a time-invariant, stable system, the bootstrap applied to the innovations yields asymptotically consistent standard errors. To investigate the performance of the bootstrap for finite sample lengths, simulation results are presented for a two-state model with ...

 

Bayesian measures of model complexity and fit

  [CiTO]
Journal of the Royal Statistical Society: Series B (Statistical Methodology), Vol. 64, No. 4. (October 2002), pp. 583-639, doi:10.1111/1467-9868.00353

Abstract

Summary. We consider the problem of comparing complex hierarchical models in which the number of parameters is not clearly defined. Using an information theoretic argument we derive a measure pD for the effective number of parameters in a model as the difference between the posterior mean of the deviance and the deviance at the posterior means of the parameters of interest. In general pD approximately corresponds to the trace of the product of Fisher's information and the posterior covariance, which in ...

 

Regression and Time Series Model Selection

  [CiTO]
(1998)
posted to model_selection time_series by e2holmes on 2008-02-06 00:38:13 ** along with 1 person matjes

Abstract

Connects many different aspects of the growing model selection field by examining the different lines of reasoning that have motivated the derivation of both classical & modern criteria, & then examines their application to see how well it matches the intent of their creators. ...

 

Model Selection and Multi-Model Inference

  [CiTO]
(12 July 2002)
posted to aic model_selection by e2holmes  on 2008-02-06 00:01:42 read along with 20 people aidankeane alexjfalcao brian ComBioWorkshop cwmccabe dekay23 dmajka druvus feiuhfahkj fxdm gregoryross istoyanov mtepper MurrellCollection neteler RolandKappe roodubh tlm82070 TLVincent wonni132

Abstract

The second edition of this book is unique in that it focuses on methods for making formal statistical inference from all the models in an a priori set (Multi-Model Inference). A philosophy is presented for model-based data analysis and a general strategy outlined for the analysis of empirical data. The book invites increased attention on a priori science hypotheses and modeling. Kullback-Leibler Information represents a fundamental quantity in science and is Hirotugu Akaike's basis for model selection. The maximized log-likelihood function ...

 

Model selection in ecology and evolution

  [CiTO]
Trends in Ecology & Evolution, Vol. 19, No. 2. (February 2004), pp. 101-108, doi:10.1016/j.tree.2003.10.013
posted to model_selection by e2holmes  on 2008-02-05 23:54:31 read along with 24 people and 4 groups adriandefroment ajw almostc BAZINGA beete BioNica bpcusack cmm fxdm gareth gennaro guhjy hkreysa istoyanov jasonn jmeppley mhasoba mroutley rebeccamancy roodubh scis0000001 simonerfreitas Wananahass yonatanf FAB-lab LABSS PsychStatsBanter Savage Lab, UCLA

Abstract

Recently, researchers in several areas of ecology and evolution have begun to change the way in which they analyze data and make biological inferences. Rather than the traditional null hypothesis testing approach, they have adopted an approach called model selection, in which several competing hypotheses are simultaneously confronted with data. Model selection can be used to identify a single best model, thus lending support to one particular hypothesis, or it can be used to make inferences based on weighted support from ...

 

Regression and time series model selection in small samples

  [CiTO]
Biometrika, Vol. 76, No. 2. (01 June 1989), pp. 297-307, doi:10.1093/biomet/76.2.297

Abstract

A bias correction to the Akaike information criterion, AIC, is derived for regression and autoregressive time series models. The correction is of particular use when the sample size is small, or when the number of fitted parameters is a moderate to large fraction of the sample size. The corrected method, called AICC, is asymptotically efficient if the true model is infinite dimensional. Furthermore, when the true model is of finite dimension, AICC is found to provide better model order choices than ...

 

GRAPH THEORY AS A PROXY FOR SPATIALLY EXPLICIT POPULATION MODELS IN CONSERVATION PLANNING

  [CiTO]
Ecological Applications, Vol. 17, pp. 1771-1782
posted to modeling population spatial by e2holmes on 2007-11-08 19:12:44 ** along with 1 person tomrevilla

Abstract

Spatially explicit population models (SEPMs) are often considered the best way to predict and manage species distributions in spatially heterogeneous landscapes. However, they are computationally intensive and require extensive knowledge of species' biology and behavior, limiting their application in many cases. An alternative to SEPMs is graph theory, which has minimal data requirements and efficient algorithms. Although only recently introduced to landscape ecology, graph theory is well suited to ecological applications concerned with connectivity or movement. This paper compares the performance ...

 

Integrating life-history and reproductive success data to examine potential relationships with organochlorine compounds for

  [CiTO]
Science of the Total Environment, Vol. 349 (2005), pp. 106-119
posted to contaminants dolphins reproduction by e2holmes  on 2007-04-23 22:51:46 read along with 1 group Stoc_Proc_Ecology_WG

Abstract

Research initiated in 1970 has identified a long-term, year-round resident community of about 140 bottlenose dolphins (Tursiops truncatus) in Sarasota Bay, Florida, providing unparalleled opportunities to investigate relationships between organochlorine contaminant residues and life-history and reproductive parameters. Many individual dolphins are identifiable and of known age, sex, and maternal lineage (V4 generations). Observational monitoring provides data on dolphin spatial and temporal occurrence, births and fates of calves, and birth-order. Capture–release operations conducted for veterinary examinations provide biological data and samples for life-history and contaminant residue measurement. ...

 

OMPARISON OF ORGANOCHLORINE CONTAMINANTS AMONG SEA OTTER (<IT>ENHYDRA LUTRIS</IT>) POPULATIONS IN CALIFORNIA AND ALASKA

  [CiTO]
Environmental Toxicology and Chemistry, Vol. 18, pp. 452-458
posted to contaminants reproduction sea_otter by e2holmes  on 2007-02-14 19:47:49 ** along with 1 group Stoc_Proc_Ecology_WG

Abstract

Organochlorine pesticides, polychlorinated biphenyls (PCBs) including non–ortho PCBs, polychlorinated dibenzo-p-dioxins (PCDDs), and polychlorinated dibenzofurans (PCDFs) were measured in sea otter liver tissue from California, southeast Alaska, and the western Aleutian archipelago collected between 1988 and 1992. Average total dichlorodiphenyltrichloroethane concentrations for California otters (850 μg/kg wet weight) were over 20 times higher than in Aleutian otters (40 μg/kg) and over 800 times higher than otters from southeast Alaska (1 μg/kg). Levels for total PCBs in Aleutian otters (310 μg/kg) were 1.7 ...

 

Contaminant exposure and effects in pinnipeds: implications for Steller sea lion declines in Alaska.

  [CiTO]
Sci Total Environ, Vol. 311, No. 1-3. (20 July 2003), pp. 111-133, doi:10.1016/s0048-9697(03)00140-2
posted to reproduction steller by e2holmes  on 2007-02-14 19:41:59 ** along with 1 group Stoc_Proc_Ecology_WG

Abstract

After nearly 3 decades of decline, the western stock of Steller sea lions (SSL; Eumetopias jubatus) was listed as an endangered species in 1997. While the cause of the decline in the 1970s and 1980s has been attributed to nutritional stress, recent declines are unexplained and may result from other factors including the presence of environmental contaminants. SSL tissues show accumulation of butyltins, mercury, PCBs, DDTs, chlordanes and hexachlorobenzene. SSL habitats and prey are contaminated with additional chemicals including mirex, endrin, ...

 

Organochlorine contamination in pinnipeds.

  [CiTO]
Rev Environ Contam Toxicol, Vol. 136 (1994), pp. 123-167
posted to reproduction steller by e2holmes  on 2007-02-14 19:38:53 ** along with 1 group Stoc_Proc_Ecology_WG

Abstract

Organochlorines, such as PCBs and DDT, are ubiquitous contaminants. Most studies reporting concentrations of organochlorines in pinnipeds have investigated ringed, grey, and harbour seals. Very few studies have been carried out on pinnipeds from the southern hemisphere. Pre-1980, the highest mean wet-weight blubber concentrations of DDT and related metabolites (911 +/- 582 micrograms g-1) were recorded in sea lions from California. The highest pre-1980 blubber concentrations of PCBs (1470 +/- 922 micrograms g-1) were recorded in harbour seals from the Netherlands. ...

 

Marine mammal neoplasia: a review.

  [CiTO]
Veterinary pathology, Vol. 43, No. 6. (1 November 2006), pp. 865-880, doi:10.1354/vp.43-6-865
posted to reproduction steller by e2holmes  on 2007-02-14 19:34:11 ** along with 1 person and 1 group InquilineKea Stoc_Proc_Ecology_WG

Abstract

A review of the published literature indicates that marine mammal neoplasia includes the types and distributions of tumors seen in domestic species. A routine collection of samples from marine mammal species is hampered, and, hence, the literature is principally composed of reports from early whaling expeditions, captive zoo mammals, and epizootics that affect larger numbers of animals from a specific geographic location. The latter instances are most important, because many of these long-lived, free-ranging marine mammals may act as environmental sentinels ...

 

Premature parturition in the California sea lion

  [CiTO]
J Wildl Dis, Vol. 12, No. 1. (1 January 1976), pp. 104-115
posted to reproduction steller by e2holmes  on 2007-02-14 19:31:53 ** along with 1 group Stoc_Proc_Ecology_WG

Abstract

Twenty percent of the California sea lion pups born on San Miguel Island die due to premature parturition. Specimens collected from premature-partus animals resulted in recovery of a virus, San Miguel Sea Lion Virus, indistinguishable from Vesicular Exanthema of Swine Virus, and Leptospira pomona from some of the premature cows and pups. The age range of 10 females delivering healthy pups in June was 10-14 years. With one exception, the ages in 10 aborting females was 6-8 years. The p,p'-DDE levels ...

 

Histology of Uterine Leiomyoma and Occurrence in Relation to Reproductive Activity in the Baltic Gray Seal (Halichoerus grypus)

  [CiTO]
Vet Pathol, Vol. 40, No. 2. (1 March 2003), pp. 175-180
posted to reproduction steller by e2holmes  on 2007-02-14 19:30:56 ** along with 1 group Stoc_Proc_Ecology_WG

Abstract

A high prevalence of uterine leiomyoma has been reported in Baltic gray seals aged 15 years and above. Studies on Baltic seals during the 1970s revealed high tissue concentrations of the organochlorines bis(chlorophenyl)-1,1,1-trichloroethane (DDT) and polychlorinated biphenyls (PCBs), lowered reproduction rate, and pathologic changes. In the second half of the 1970s, decreases of PCB and DDT in Baltic biota occurred, and the prevalence of pregnancies in Baltic seals increased. Between 1975 and 1997, 53 Baltic gray seal females of age 15-40 ...

 

Trends in bird and seal populations as indicators of a system shift in the Southern Ocean

  [CiTO]
Antarctic Science, Vol. 15, No. 3. (01 January 2006), pp. 249-256
posted to climate_change modeling by e2holmes  on 2006-11-15 21:41:59 ***** along with 946 people and 145 groups 100155430 aartaki abbyworld ablam Abroxa acastaner acer adamsi adenkabe adjih adriancooke aelva afrojapchick agallet agarza agogoh3 agraham AJCann ak Akimasa aklassen alchemyst Alemohammad alexbdigital alexispaz alexloh80 alexstorer alicetiara alikocho AlisonBabeu amarois amcmorl amydash anar andersok andreacapocci andreacastelletti andrealira andresmh aniak AnneB annmarie37 anon_pl ansobol antistarlet aozkan apokgmc applebyb APSLuppa arichar6 arnavjhala asalvadori ashandanj ashko asmusolsen atbrew athma atsu-kan austin aviad_work awc axin Axis Ayest azygmunt baaklini babyone baikanamako balabu balicea bangb baniel barbz79it BarrosH bayesian bazza030 Becky_Shen bellia bemike benavides benmiller314 bennettn BenWillems bernstei berthelemy bertrandservin berylschaefer bezbozhnik BiebmiepLeen bigga bigmagpie billwolff Biomedyknight BioNica bjbecerra bkliethermes blackm0k bleong 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joepickrell johannsen johnabender johncumbers johnnywu JonathanD JonathanFeinberg joni2am jorgen josemblazquez joshuashen jpassoth jpbenda jsanpedro jsenn JSicot jspeer jsvoboda jszekely juliajumeau junoda jurijmlotman justaubrey jvrantwijk jyew kaniko karin KarinaFigueroa karipuf kate_waxlyrical Katje kaz229 kcrawlik kdesmond kdouglass kedmond keitokita kennedie kenneth1ny kentz kericson kevin7 kgronemyer kgutwin kightley kimlab kinestetika kliether kmcolo kndiaye knowlengr kovacsv kozima kristina kroatiker krokicki krzywy kungcc kupopo kutabar l-alex ladygoat Laki langec Langster lanubile last5laps laurabailey lauragonzalez lauratest LaurieEMiller ldietz lechristophe lectorespa leechuck Leize lesikv lfriedl librain lijil lilalia lillekatt linxiang lionicebear lisa1 livingthingdan lizbiogen lna lns locatellimp loison long lorin lossius lottebelice lrodero lrsantos LTrottier lucbelanger lupianiedu lynleypage lynnefox lyongu m8eld1989 maburkitt macfreek macowell Maderlock madhadron mahlow majdula makbot malkav30 mamadoudiao Manhal mansaok manuelpq MarcJungbluth marcusbm MariaChiaraP MariekeVanWamel marinari markusd marohn martint massimocencini mattlee matts matzke mazsx mbaric mchinen mcphee mdifranc mebiel mederly mehjabin melanieramage melody metaspencer mfenner mfisk mfloris mgran mgregg MHRashid micha137 MichaelGaebler michaelmampaey michmill mick39 midshipman miguelbezerra mirweis mitchee3 mjaz mkcerusky mkharito mkowa mkwalker mleis mlewcio mllee mloewer mlovelace mlzafron monientiedt monkare mortimer motchy mpennell mpisarenco mrkrause mrosenki msampson mtelleri mtr mtruksa mtugrul muellerkind muli murb mwyarbro nafets nascardaughter natasjadenouden nathanielvirgo naturecure nazareno nbr nco71 ndegara nealpfox Neeperando Nele neteler ngrandy nickpitman NicolasNeubauer nikko nina4citeulike NitinCR nkishan nlafferty nlauzier nmaisonneuve nnikolaj nojhan nperrin nschaeff nschwart nshephard nybon oceanflynn octobremtl Odi oilpalm okarsligil olaf omidf2 os252 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Population regulation: a synthetic view

  [CiTO]
Oikos, Vol. 84, No. 1., pp. 153-159
posted to density-dependence by e2holmes  on 2006-11-15 15:50:21 ***** along with 1 group Stoc_Proc_Ecology_WG

Abstract

Population ecologists continue to debate population regulation. If anything, the controversy intensified during the last decade. Does it mean that our field has not progressed very far since the days of the "great debate" between Nicholson and Andrewartha? Three years ago I suggested that in actuality the broad outlines of a consensus were emerging. What I have read in the literature since then has only confirmed me in the opinion that most population ecologists are in agreement on the major, strategic ...

 

Detecting Changes in Ecological Time Series

  [CiTO]
Ecology, Vol. 71, No. 6., pp. 2044-2052
posted to time_series by e2holmes  on 2006-08-10 14:19:09 ** along with 1 group Stoc_Proc_Ecology_WG

Abstract

Some practical techniques are discussed for analyzing time series whose statistical properties are changing with time. We first consider how principal component analysis can reduce the multidimensional nature of certain series and, in particular, apply this technique to the analysis of changing seasonal patterns. Discussions of trend, changes in oscillatory behavior, and unusual events follow. The problem of making inferences regarding causation is briefly considered. We conclude with a call for flexibility in approach. ...

 

DISPERSAL, ROOKERY FIDELITY, AND METAPOPULATION STRUCTURE OF STELLER SEA LIONS (<IT>EUMETOPIAS JUBATUS</IT>) IN AN INCREASING AND A DECREASING POPULATION IN ALASKA

  [CiTO]
Marine Mammal Science, Vol. 18 (2002), pp. 746-764
posted to no-tag by e2holmes  on 2006-05-23 01:43:08 read along with 1 group Stoc_Proc_Ecology_WG
 

Associations Between The Alaska Steller Sea Lion Decline And Commercial Fisheries

  [CiTO]
Ecological Applications, Vol. 16 (2006), pp. 704-717
posted to steller by e2holmes  on 2006-05-23 00:05:54 read along with 1 group Stoc_Proc_Ecology_WG

Abstract

The Steller sea lion (SSL) population in Alaska was listed as threatened under the Endangered Species Act in 1990. At that time, several procedural restrictions were placed on the commercial fisheries of the region in an effort to reduce the potential for human-induced mortality on sea lions. Several years have elapsed since these restrictions were put into place, and questions about their efficacy remain. In an effort to determine whether or not fisheries management measures have helped the SSL population to ...

 

Bayesian nonparametric model selection and model testing

  [CiTO]
Mathematical Psychology (2005)
posted to bayesian model_selection by e2holmes  on 2006-02-24 23:05:49 ** along with 1 group Stoc_Proc_Ecology_WG

Abstract

This article examines a Bayesian nonparametric approach to model selection and model testing, which is based on concepts from Bayesian decision theory and information theory. The approach can be used to evaluate the predictive-utility of any model that is either probabilistic or deterministic, with that model analyzed under either the Bayesian or classical-frequentist approach to statistical inference. Conditional on an observed set of data, generated from some unknown true sampling density, the approach identifies the ‘‘best’’ model as the one that predicts a sampling density ...

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