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Welcome to the Pubget Medical Subject Headings (MESH) browser. Click on a topic or subtopic below to explore related papers. In the gold box is the most recent paper about the current MESH term, and below are 20 related papers.
Population Dynamics (4):
Recent article
Population Dynamics
American Naturalist (178)S1 2011
Abstract
We investigated the causes of range limits in a model system, the eastern border of the California annual plant Clarkia xantiana ssp. xantiana. Vital rates of 20 populations varied with growing season temperature and precipitation: fruit number and overwinter survival of 1-year-old seeds declined st...
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PMID: 21956090
PDF is available here.
PDF is available here.
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American Naturalist (178)S1 2011
Abstract
We walk through a set of interrelated spatial scenarios that illustrate interesting complexities of this interplay. To motivate our individual-based model results, we consider a hypothetical zooplankter in a landscape of discrete water bodies coupled by dispersal. We examine how patterns of dispersa...
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PMID: 21956092
PDF is available here.
PDF is available here.
American Naturalist (178)S1 2011
Abstract
American Naturalist (178)S1 2011
Abstract
We evaluate alternative range limit models using a multilocus data set based on DNA sequences and microsatellites along with field demographic data from the annual plant Clarkia xantiana ssp. xantiana. Our data suggest that central and peripheral populations have very large historical and current ef...
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PMID: 21956091
PDF is available here.
PDF is available here.
American Naturalist (178)S1 2011
Abstract
The distribution of insects can often be related to variation in their response to thermal extremes, which in turn may reflect differences in plastic responses or innate variation in resistance. Species with widespread distributions are expected to have evolved higher levels of plasticity than those...
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PMID: 21956094
PDF is available here.
PDF is available here.
American Naturalist (178)S1 2011
Abstract
We assess these theories in an analysis of the twofold decline in bird species richness along the Himalayas from the southeast to the northwest. The presence of fewer species in the northwest is entirely due to a steep decline in the number of forest species; species occupying more open habitats sho...
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PMID: 21956095
PDF is available here.
PDF is available here.
Abstract
Spatial waves of advance with bistable dynamics: cytoplasmic and genetic analogues of Allee effects.
Abstract
We synthesize and extend theoretical analyses concerning three features of their spatial behavior: rate of spread, conditions to initiate spread from a localized introduction, and wave stopping caused by variation in population densities or dispersal rates. Unlike Fisherian variants, bistable varian...
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PMID: 21828986
PDF is available here.
PDF is available here.
Abstract
We examine theoretically the effects of rapid evolution and phenotypic plasticity of antipredatory defense on predator-prey dynamics. Our analyses reveal that phenotypic plasticity tends to stabilize population dynamics more strongly than rapid evolution. It is therefore important to know the mechan...
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PMID: 21828987
PDF is available here.
PDF is available here.
Abstract
These results differ from those of several other recent models of life-history omnivory. They suggest that life-history omnivory may be one of the primary reasons why exploited populations undergo sudden collapses and why collapsed populations fail to recover in spite of large reductions in the expl...
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PMID: 21828988
PDF is available here.
PDF is available here.
Presse Medicale (40)11 2011
Abstract
Abstract
Epidemic theory predicts that the vaccination threshold required to interrupt local transmission of an immunizing infection like measles depends only on the basic reproductive number and hence transmission rates. When the search for optimal strategies is expanded to incorporate economic constraints,...
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PMID: 21825129
PDF is available here.
PDF is available here.
Abstract
Orvosi Hetilap (152)33 2011
Abstract
Osteoporotic fractures are associated with excess mortality. Effective treatment options are available, which reduce the risk of vertebral and non-vertebral fractures, but the identification of patients with high fracture risk is problematic. Low bone mineral density (BMD)--the basis for the diagnosi...
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PMID: 21824857
PDF is available here.
PDF is available here.
Abstract
MMW Fortschritte der Medizin (153)32-34 2011
Abstract
Abstract
We use a quantitative genetics framework to examine how phenotypic variation in a predator affects the outcome of apparent competition between its two prey species. Classical apparent competition theory predicts that prey have reciprocally negative effects on each other. The addition of phenotypic t...
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PMID: 21905425
PDF is available here.
PDF is available here.
Abstract
We address the question of whether the magnitude of the effect of genotype number on population performance can be explained by the extent of dissimilarity in key traits among genotypes in a mixture. We examine the relative contribution of genotype number and phenotypic dissimilarity among genotypes...
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PMID: 21905427
PDF is available here.
PDF is available here.
Abstract
We excluded terrestrial birds and mammals from fourteen 6 x 7.5 m plots in Australian primary tropical rain forest and compared recruitment and survival of tree seedlings annually over the subsequent seven years to that on nearby open plots. We re-censused a subset of the plots after 13 years of ver...
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PMID: 21905430
PDF is available here.
PDF is available here.
Abstract
We overcame this hurdle by applying, for the first time to an ecological question, a finite impulse-response signal-filtering approach to identify human and natural environmental drivers of movements of 13 free-ranging African elephants (Loxodonta africana) from distinct social groups collected over...
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PMID: 21905431
PDF is available here.
PDF is available here.
Abstract
We present such an analysis using demographic data collected during the interval 1978-1996 for six populations of western terrestrial garter snakes (Thamnophis elegans) from two evolutionarily divergent ecotypes. Three replicate populations from a slow-living ecotype, found in mountain meadows of no...
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PMID: 21905432
PDF is available here.
PDF is available here.
Abstract
We use penalized splines within a Bayesian state-space modeling framework to estimate and visualize survival probability in two dimensions. The approach is flexible in that no parametric form for the relationship between survival and coordinates need be specified a priori. To illustrate our method,...
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PMID: 21905433
PDF is available here.
PDF is available here.
Abstract
We applied capture-mark-recapture analysis to 25 years of monthly trapping data from a fluctuating prairie vole Microtus ochrogaster population in Illinois, USA, to estimate realized population growth rates and associated vital rates (survival and recruitment) and modeled them as a function of vole...
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PMID: 21905434
PDF is available here.
PDF is available here.
Abstract
This report analyzes the patterns of childlessness, and conversely, the first-birth patterns of three birth cohorts of American women. For this report, a cohort refers to women born in the same year. The cohorts compared were women born in 1910, 1935, and 1960-who, consequently, turned 25 during the...
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PMID: 21936340
PDF is available here.
PDF is available here.
Abstract
The introduction of pathogens into populations of animals with no previous exposure to them and, therefore, no immunologic protection, can result in epizootics. Predicting the susceptibility of populations to infectious diseases is crucial for their conservation and management. Australian fur seals (...
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PMID: 21719820
PDF is available here.
PDF is available here.
Abstract
We assessed the presence of selected agents of abortion in Alpine ibex by serologic, molecular, and culture techniques and evaluated whether infection with these agents might have affected population densities. Blood and fecal samples were collected from 651 ibex in 14 colonies throughout the Swiss...
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PMID: 21719818
PDF is available here.
PDF is available here.
Abstract
We explore the effects of hydrological and meteorological conditions on WNV infection among Culex genus mosquitoes collected during 2001-2009 in Suffolk County, Long Island, NY. We show that WNV infection rates in assayed pools of Culex mosquitoes are associated in both space and time with hydrologi...
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PMID: 21845947
PDF is available here.
PDF is available here.
Abstract
We calculated stage-specific developmental times, age-specific mortality and fecundity, stage-specific and total preadult mortality, and the intrinsic rate of natural increase (r0 = 0.21), the finite population growth rate (h = 1.23), the net reproductive rate (R0 = 314.24), and the generation time...
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PMID: 21845936
PDF is available here.
PDF is available here.
Abstract
We characterized the thermal sensitivity of larval developmental rates and survival in several Australian mainland populations of the dengue virus vector Aedes aegypti. Males developed more rapidly than females, but there were no differences among populations for development time or survival despite...
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PMID: 21845954
PDF is available here.
PDF is available here.
Abstract
The population size, age-class structure, and movement of the American cockroach, Periplaneta americana (L.) (Dictyoptera: Blattidae), were studied in three sewers in Penang, Malaysia, from September 2008 to October 2009. Eighteen to 20 glass-jar traps (two per manhole) were deployed for a 24-h perio...
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PMID: 21845938
PDF is available here.
PDF is available here.
Abstract
We used a Bayesian method to estimate the molting success of larval I. scapularis collected from four commonly parasitized species of birds and eight commonly parasitized small and mid-sized mammals found in the forests of Dutchess County, New York. We show that molting success varies substantially...
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PMID: 21845946
PDF is available here.
PDF is available here.
Pflege Zeitschrift (64)7 2011
Abstract
Pflege Zeitschrift (64)7 2011
Abstract
Abstract
We determined the biotypes composition in 61 whitefly populations and their distribution across 19 provinces in China. Our research revealed that only biotypes B and Q have been found in the field in 2009 in China. Among them, biotype Q was dominant in 44 locations (100.0%) and biotype B was dominan...
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PMID: 21735919
PDF is available here.
PDF is available here.
Abstract
Beginning in November 2007 and continuing until December 2009, weekly stable fly, Stomoxys calcitrans (L.), surveillance was conducted at four equine facilities near Ocala, FL, by using alsynite sticky traps for adults and by searching immature developmental sites for pupae. Adult stable fly trap cap...
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PMID: 21735936
PDF is available here.
PDF is available here.
Abstract
Larval control is an integral part of malaria vector management in Ethiopia and elsewhere. For effective larval control, a sound understanding of the factors responsible for spatio-temporal variation in larval production is essential. A study was thus conducted to characterize larval habitats of anop...
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PMID: 21715730
PDF is available here.
PDF is available here.
Abstract
To examine demographic differences during a 1-year observational period between urban feeding groups of neutered and unneutered free-roaming cats following a trap-neuter-return procedure.
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PMID: 21529235
PDF is available here.
PDF is available here.
Abstract
To examine behavioral differences during a 1-year observational period between urban feeding groups of neutered and sexually intact free-roaming cats following a trap-neuter-return procedure.
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PMID: 21529236
PDF is available here.
PDF is available here.
Modern Healthcare (41)18 2011
Abstract
Abstract
Pflege Zeitschrift (64)4 2011
Abstract
Pflege Zeitschrift (64)4 2011
Abstract
Zoological Research (32)2 2011
Abstract
We discuss the impacts on fishes caused by hydropower projects in Lixianjiang, and evaluate effects and problems on the propagation of Parazacco spilurus, Hemibagrus pluriradiatus, Neolissochilus benasi and Semilabeo obscurus. A successful propagation project includes foraging ecology in fields, pon...
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PMID: 21509965
PDF is available here.
PDF is available here.
Zoological Research (32)2 2011
Abstract
We found that the Shannon-Wiener index declined in Dianchi Lake, particularly in Caohai Lake, from 2.70 in the 1950s to 0.30 in 2009 and 2010. Species richness and biodiversity was significantly negative correlated with total phosphorus and total nitrogen. Factors responsible for the benthic communi...
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PMID: 21509969
PDF is available here.
PDF is available here.
Zoological Research (32)2 2011
Abstract
To provide initial value for population restoration and management of wolves (Canis lupus) in the wild, line transect survey and fecal analysis method were used to study the population ecology of wolf at Saihanwula National Nature Reserve, Inner Mongolia. The results revealed that the population numb...
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PMID: 21509971
PDF is available here.
PDF is available here.
Abstract
We examine the major patterns of Holocene faunal population dynamics and connectivity; highlighting the dynamic nature of species and population responses to Holocene climatic change, thereby providing an 'analogue' for understanding potential impacts of future change....
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PMID: 21529992
PDF is available here.
PDF is available here.
Abstract
We used a candidate gene approach to test for associations between 944 single-nucleotide polymorphism markers from 549 candidate genes and 25 wood quality traits in white spruce. A mixed-linear model approach, including a weak but nonsignificant population structure, was implemented for each marker-...
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PMID: 21385726
PDF is available here.
PDF is available here.
Abstract
We first implemented a rich family of microsatellite mutation models and related components in the software package BEAST. BEAST is a powerful tool that performs Bayesian MCMC analysis on molecular data to make coalescent and evolutionary inferences. Our implementation permits the application of exi...
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PMID: 21385725
PDF is available here.
PDF is available here.
Abstract
Abstract
A discrete chemotactic predator-prey model is proposed in which the prey secrets a diffusing chemical which is sensed by the predator and vice versa. Two dynamical states corresponding to catching and escaping are identified and it is shown that steady hunting is unstable. For the es...
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PMID: 21517532
PDF is available here.
PDF is available here.
Abstract
We consider control of reaction and population systems by imposing transitions between states with different numbers of particles or individuals. The transitions take place at predetermined instants of time. Even where they are significantly less frequent than spontaneous transitions, they can expon...
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PMID: 21517535
PDF is available here.
PDF is available here.
Abstract
Dinoflagellates are a major taxonomic group in marine phytoplankton communities in terms of diversity and biomass. Some species are also important because they form blooms and/or produce toxins that may cause diverse problems. The composition of planktonic dinoflagellates of the orders Prorocentrales...
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PMID: 21516662
PDF is available here.
PDF is available here.
Abstract
Vegetation changes during the Holocene in the North Iberá, Corrientes, Argentina. Wetlands are very important sites for palynological studies, since they represent one of the most suitable environments for fossil pollen preservation. The aim of this work was to determine, by palynological analysis o...
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PMID: 21516639
PDF is available here.
PDF is available here.
Abstract
Information on changes over time in the biodiversity and ecology of tropical systems is of increasing importance against the background of local, regional, and global dynamics. This study aimed to contribute with long-term data on the abundance fluctuations of two species of echinoderms from a tropic...
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PMID: 21513196
PDF is available here.
PDF is available here.
Abstract
We present here latitudinal and bathymetric distribution of the most abundant and frequent bycatch species from the Gulf of California. The samples were obtained from a total of 111 hauls taken during seven research cruises of the closed shrimp season (2002-2005-2007), and also, from research cruise...
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PMID: 21516649
PDF is available here.
PDF is available here.
Abstract
We collected disperse data from museum records (national and international) and explored the possible association between collection records and precipitation data available for the Henri Pittier National Park (PNHP). Likewise, we carried out a systematic population monitoring of G. ovifera in histo...
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PMID: 21516654
PDF is available here.
PDF is available here.
Abstract
Mountain ecosystems have shown slow mineralization activity due to weather conditions, and to some groups with arthropods with special roles. The Collembola is an important group for litter fragmentation, showing different distribution patterns. The objective of the present study was to determine the...
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PMID: 21516653
PDF is available here.
PDF is available here.
Abstract
We calculated it spatial-temporal distribution, population parameters (based on size and weight) and diet in the Orinoco Delta ecoregion (Venezuela). The ecoregion was divided in three sections: Golfo de Paria, Boca de Serpiente and Plataforma Deltana. Samples for the rainy and dry seasons came from...
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PMID: 21516638
PDF is available here.
PDF is available here.
Abstract
We estimated sex ratio, reproduction period and feeding habits. To assess growth parameters and infer on the degree of exploitation, the standard length frequency data were analysed using the FISAT (ELEFAN I) computer program. Data revealed a sex ratio of 0.8:1 (M:F), that reproduction occurs all ye...
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PMID: 21513193
PDF is available here.
PDF is available here.
Abstract
The clam Megapitaria squalida is a fishing resource with increasing importance in Northwestern Mexico. Nevertheless, this fishery has shown important variations that could be related to environmental factors. To assess this, monthly landings of M. squalida were analyzed during 2002-2005 for Bahía de...
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PMID: 21516643
PDF is available here.
PDF is available here.