Filters: Tags: Population size (X)
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Categories: Publication;
Types: Citation;
Tags: Conferences,
Contraceptives,
Decision making,
Economics,
Environment management,
Categories: Publication;
Types: Citation;
Tags: Demography,
G 07270 Ecological genetics; D 04672 Mammals,
Genetic structure,
Genetics Abstracts; Ecology Abstracts,
Grasses,
Categories: Publication;
Types: Citation;
Tags: ASW, Mexico Gulf,
Chemotaxonomy,
DNA,
G 07270 Ecological genetics; D 04668 Fish; Q1 01443 Populati,
Genetic diversity,
Categories: Publication;
Types: Citation;
Tags: ASFA 1: Biological Sciences & Living Resources; Oceanic Abst,
Biomass,
Ecosystems,
Eumetopias jubatus,
Food availability,
Categories: Publication;
Types: Citation;
Tags: Biodiversity,
Books,
Decision making,
Human Population,
Human impact,
Synopsis: This study aimed to independently examine the effects of varying amounts and configurations of habitat at a landscape scale, with particular attention to critical persistence thresholds. A discrete reaction-diffusion model was used to estimate long-term equilibrium population persistence of a hypothetical species in a patchy landscape. When examined over a broad range of habitat amount and arrangements, population size was largely determined by the proportion of habitat (amount) in a landscape. However, when habitat coverage dropped below 30-50%, population response deviated, coinciding with a persistence threshold. Species persistence declined rapidly at this threshold range (50% for low degrees of aggregation,...
Categories: Publication;
Types: Citation;
Tags: Landscape fragmentation,
Natural cover amount,
arrangement,
configuration,
dispersal,
The endangered Indiana bat (Myotis sodalis) has declined dramatically and continuing threats have made it necessary to understand population dynamics and life history throughout the year. Specifically, demographic information (e.g., population size, reproductive success, survival) from the summer range where females raise their young in maternity colonies is difficult to estimate precisely using traditional techniques (such as emergence counts). Further, the familial makeup of maternity colonies is unknown. Genetic mark-recapture methods are increasingly being used to estimate demographic parameters in species where traditional techniques are problematic and can also provide insight into relatedness among individuals....
Categories: Data;
Types: Citation;
Tags: Indiana,
Indianapolis,
Myotis sodalis,
USGS Science Data Catalog (SDC),
United States,
Data is included for two types of field surveys conducted for freshwater mussels in the mainstem of the middle and upper Delaware River in the Mid-Atlantic region of the United States from 2000-2002. Timed search (qualitative) surveys were conducted during 2000-2001 from a point at the confluence of the East and West Branches of the Delaware River near Hancock, NY continuously downstream to a point at the mouth of the Paulins Kill River near Columbia, NJ. In this qualitative survey, mussel species and counts were collected in the field catch-per-unit-effort (CPUE) data was determined for all mussel species within each of 1,095 consecutive stream sections ~200 m in length. Subsequent quantitative surveys were conducted...
Categories: Data;
Tags: Aquatic Biology,
Delaware River,
Delaware Water Gap National Recreation Area,
Ecology,
New Jersey,
Categories: Publication;
Types: Citation;
Tags: G 07300 Theoretical genetics,
Genetic diversity,
Genetic drift,
Genetics Abstracts,
Population genetics,
![]() This dataset depicts settlements in Belize created using various sources: International Travelers Map of Belize (1:350.000) and 2001 CSO Abstract of Statistics + own point data.
Categories: Publication;
Types: Citation;
Tags: Conservation,
D 04670 Reptiles; G 07290 Population genetics,
Ecology Abstracts; Genetics Abstracts,
Genetic diversity,
Lacerta agilis,
Categories: Publication;
Types: Citation;
Tags: Demographic Change,
Fertility,
Human Population,
Longevity,
M1 130 Population Research and Methodology,
Categories: Publication;
Types: Citation;
Tags: Conservation,
Endangered species,
G 07270 Ecological genetics; D 04001 Methodology - general; ,
Genetics Abstracts; Ecology Abstracts,
Methodology,
Categories: Publication;
Types: Citation;
Tags: Children,
Family size,
Government policy,
Human Population,
Legislation,
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