نتایج جستجو برای: habitat parameters

تعداد نتایج: 630563  

1998
Cheryl B. Schultz Elizabeth E. Crone

Designing strategies to manage rare species’ habitats may involve tradeoffs that include negative shortterm impacts to achieve positive long-term success. In managing grasslands, fire is a powerful tool to control invasive weeds and stimulate native plant growth, but it may decimate the invertebrate fauna. To rank potential burn strategies for Icaricia icarioides fenderi (Fender’s blue butterfl...

Journal: :Ecological applications : a publication of the Ecological Society of America 2007
Caroline R Bulman Robert J Wilson Alison R Holt Lucia Gálvez Bravo Regan I Early Martin S Warren Chris D Thomas

A key question facing conservation biologists is whether declines in species' distributions are keeping pace with landscape change, or whether current distributions overestimate probabilities of future persistence. We use metapopulations of the marsh fritillary butterfly Euphydryas aurinia in the United Kingdom as a model system to test for extinction debt in a declining species. We derive para...

2002
Han Olff Mark E. Ritchie

We discuss how fragmentation of resources and habitat operate differently on species diversity across spatial scales, ranging from positive effects on local species coexistence to negative effect on intermediate spatial scales, to again positive effects on large spatial and temporal scales. Species with different size and mobility can be regulated by different processes at the same spatial scal...

2007
Veronika Braunisch Rudi Suchant

Most habitat models developed for defining priority conservation sites target areas currently exhibiting suitable habitat conditions. For species whose habitats have been altered by land use practices, these models may fail to identify sites with the potential of producing suitable habitats, if management practices were modified. Using capercaillie Tetrao urogallus as an example, we propose a m...

2012
ROBERT A. SCHORR

The Preble’s meadow jumping mouse (Zapus hudsonius preblei [PMJM]) is a rare rodent of southeastern Wyoming and central Colorado that has been the center of debates regarding subspecies’ genetic identity and the application of the Endangered Species Act. I analyzed a 7-year PMJM mark–recapture data set using a temporal symmetry model (Pradel model) to estimate apparent survival (u), recruitment...

Journal: :The Journal of animal ecology 2009
Nora Underwood

1. Species diversity can affect many ecological processes; much less is known about the importance of population genetic diversity, particularly for the population dynamics of associated species. Genetic diversity within a host species can create habitat diversity; when associated species move among hosts, this variation could affect populations additively (an effect of average habitat) or non-...

Journal: :مرتع و آبخیزداری 0
حمید محمدی ، حمیدرضا کریم زاده جمال الدین خواجه الدین

study of soil and plant relationships is nessesery for ecological- based and appropriate management. the objective of this study is to determine the influence of edaphic properties on haloxylon persicum growth and also, indentifing growth limiting soil properties for saxaul. the study was performed through the stratified random sampling and 3 sites were selected as follow: planted strong saxaul...

2016
Thomas Kuhn Sarah Cunze Judith Kochmann Sven Klimpel

Marine nematodes of the genus Anisakis are common parasites of a wide range of aquatic organisms. Public interest is primarily based on their importance as zoonotic agents of the human Anisakiasis, a severe infection of the gastro-intestinal tract as result of consuming live larvae in insufficiently cooked fish dishes. The diverse nature of external impacts unequally influencing larval and adul...

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