نتایج جستجو برای: structural habitat variables

تعداد نتایج: 745422  

Journal: :The Onderstepoort journal of veterinary research 2003
A Estrada-Peña

Models predicting current habitat availability for four prominent tick species in Africa (Boophilus decoloratus, Amblyomma hebraeum, Rhipicephalus appendiculatus and Hyalomma truncatum) were constructed using remotely sensed information about abiotic variables and a point-to-point similarity metric. Year-to-year variations in the forecasted habitat suitability over the period 1983-2000 show a c...

2002
Ilse Storch

This paper explores the effects of spatial resolution on the performance and applicability of habitat models in wildlife management and conservation. A Habitat Suitability Index (HSI) model for the Capercaillie (Tetrao urogallus) in the Bavarian Alps, Germany, is presented. The model was exclusively built on non-spatial, small-scale variables of forest structure and without any consideration of...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2006
David R Bowne Michael A Bowers James E Hines

Connectivity is a measure of how landscape features facilitate movement and thus is an important factor in species persistence in a fragmented landscape. The scarcity of empirical studies that directly quantify species movement and determine subsequent effects on population density have, however, limited the utility of connectivity measures in conservation planning. We undertook a 4-year study ...

2004
S. E. MCRAE J. B. BURCH

1. We investigated the diversity and distribution of freshwater mussels at 40 sites in an agricultural catchment, the River Raisin in south-eastern Michigan, to relate mussel assemblages and individual taxa to reach and catchment-scale variables. Unionids were surveyed by timed searches in 100-m reaches, and in-stream and riparian habitat were quantified as well as flow, water chemistry and cha...

2002
Kathleen M. Bergen Daniel G. Brown Eric J. Gustafson M. Craig Dobson

Mapping for biodiversity informatics requires information on habitat so that known species occurrences may be extrapolated to maps of potential species occurrences. In the case of vegetation requirements for habitat, most current datasets of actual vegetation have been derived from optical (e.g. aerial photography or Landsat) remotely sensed data. These data are largely limited to describing ho...

2002
JEREMY W. LICHSTEIN THEODORE R. SIMONS SUSAN A. SHRINER KATHLEEN E. FRANZREB

Recognition and analysis of spatial autocorrelation has defined a new paradigm in ecology. Attention to spatial pattern can lead to insights that would have been otherwise overlooked, while ignoring space may lead to false conclusions about ecological relationships. We used Gaussian spatial autoregressive models, fit with widely available software, to examine breeding habitat relationships for ...

2006
J. E. Christie J. Kemp C. Rickard E. C. Murphy

The influence of micro-habitat on stoat (Mustela erminea) and rat (Rattus rattus) capture success was explored using trapping data collected from large scale predator control operations at the Okarito and Moehau Kiwi (Apteryx spp.) sanctuaries. Generalised linear models were used to explore the relationship between microhabitat predictors and predator kill trapping records from individual trap ...

Journal: :Geospatial health 2008
Kenneth J Stein Megan Waterman Jefferson L Waldon

Larval, nymphal, and adult Amblyomma americanum (L.), and adult Dermacentor variabilis (Say) ticks were collected using timed dragging techniques, in an attempt to examine how different habitat variables affect models that describe the distribution of ticks in Virginia, USA. Tick count data were modeled using two approaches: (i) habitat and edge, and (ii) habitat, edge, vegetation density and l...

رضایی, حمیدرضا, وارسته‌مرادی, حسین, کریمی, سرور,

  Investigation of the ecological characteristics of wildlife species and determination of habitat suitability for them is one of the main pillars for wildlife management and protection. In this study, the winter and spring habitat suitability of black woodpecker (Dryocopusmartius) was studied in ShastKalateh forest. Habitat characteristics, including forest vegetationtype, structural character...

2011
Ana Rainho Jorge M. Palmeirim

Many bats are threatened by habitat loss, but opportunities to manage their habitats are now increasing. Success of management depends greatly on the capacity to determine where and how interventions should take place, so models predicting how animals use landscapes are important to plan them. Bats are quite distinctive in the way they use space for foraging because (i) most are colonial centra...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید