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Showing 1 to 20 of 41 for “"habitat models"”.
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Mammal Distributions and Habitat Models for South Dakota
… current biological information, and predictive habitat modeling. In this program, predicted habitat for each species is compared to protection offered from public lands, identifying species that are not adequately protected (i.e., have "gaps" in protection). Then, conservation may be suitable …
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Multiple-scale habitat models of benthic fish abundance in riffles
… and black jump rock and availability of stream habitat features at three spatial scales in two reaches of the Roanoke River, Virginia. The utility of underwater observation as a method of estimating benthic fish densities is also assessed. Distributions of perpendicular sighting distances …
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Habitat models for plant functional groups with respect to soil parameters and management
… stepwise logistic regression the most important habitat factors were identified determining the occurrence of these plant functional groups (PFGs). Furthermore, habitat models were developed. With these models it is possible to predict the probabilities of occurrence for the PFGs under certain …
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Habitat models for predicting the occurrence of blotchside logperch (Percina burtoni) and tangerine darters (P. aurantiaca) in the North Fork Holston River and Little River, Virginia
… of 1992 and 1993, respectively. Presence-absence models were developed, using stepwise logistic regressions, from habitat characteristics measured on a scale ranging from large-scale (geographic location) to local-scale (habitat-unit characteristics) for blotchside logperch (<i>Percina …
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Ecological scale and species-habitat modeling: studies on the Northern flying squirrel.
… nature of wildlife populations, species-habitat modeling is a field in which much proliferation of multi-scale studies has occurred, and thus provides a good arena within which to test both scale theory and its application. Insufficient examination of a relevant breadth of the scale …
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Predicting Amphibian Occurrence Based on Wetland and Landscape Level Factors in Montana
… a complex life history that requires a mosaic of habitats, including breeding, foraging, and over-wintering areas. Historically, regulators have focused on wetland breeding habitat quality to explain amphibian presence. Recently, other habitat requirements including landscape level factors have …
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Predicting Amphibian Occurrence Based on Wetland and Landscape Level Factors in Montana
… a complex life history that requires a mosaic of habitats, including breeding, foraging, and over-wintering areas. Historically, regulators have focused on wetland breeding habitat quality to explain amphibian presence. Recently, other habitat requirements including landscape level factors have …
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Influence of physical and biological habitat variables on juvenile salmonid and invertebrate drift abundance in southwest British Columbia streams
Determining the physical and biological habitat variables that influence the abundance of juvenile salmonids in British Columbia streams will improve management practices. Habitat models are tools that provide insight into organisms’ habitat needs and provide a more efficient mechanism for …
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The use of right of ways by primary burrowing crayfishes in the Ouachita Mountains Ecoregion of Arkansas
… To investigate this interaction, I collected habitat data, locality information, and tested computer generated habitat models for these two species in the Ouachita Mountains Ecoregion (OME) of western Arkansas in the spring of 2014 and 2015. My first objective was to determine the fine-scale …
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Spatial models of Hawaiian streams and Hawaiian stream fish habital
A series of spatially based models of Hawaiian streams and stream fish habitats were developed to aid in the conservation of native fishes. The spatial models focused on the quantification of habitat for native fishes at three levels within a spatial hierarchy. First, at the reach level, the models …
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The influence of probability of detection when modeling species occurrence using GIS and survey data
I compared the performance of habitat models created from data of differing reliability. Because the reliability is dependent on the probability of detecting the species, I experimented to estimate detectability for a salamander species. Based on these estimates, I investigated the sensitivity of …
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Habitat Niche Modeling in the Texas Horned Lizard (Phrynosoma cornutum): Applications to Planned Translocation
… Oklahoma, using correlative and mechanistic habitat suitability models. My goals were broadly classified into two categories: first, to determine if the addition of mechanistic data layers (i.e., habitat-niche models) in a correlative model improved the overall accuracy of model predictions, …
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Multi-scale patterns of habitat use by Roanoke logperch (Percina rex) in Virginia rivers: a comparison among populations and life stages
… Virginia. This dissertation examines multi-scale habitat use patterns by logperch in three river systems in Virginia, including comparisons among rivers and life stages. The first study in this dissertation compares microhabitat use patterns of logperch among the Roanoke, Pigg, and Nottoway …
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Restoration of Red Spruce (Picea rubens) and Virginia Northern Flying Squirrel (Glaucomys sabrinus fuscus) Habitat in West Virginia
… of West Virginia and Virginia. Existing habitat suitability models emphasize the composition of the red spruce canopy but lack insights into the structural characteristics of the forest that are critical for VNFS occupancy. I examined VNFS habitat preference through previous survey …
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HABITAT CHARACTERISTICS AND DEMOGRAPHY OF CALYPSO BULBOSA AND CYPRIPEDIUM ARIETINUM IN THE GRAND SABLE DUNES, MICHIGAN
<p>This is a study of the distribution, habitat characteristics, and reproductive demography of <em>Calypso bulbosa</em> and <em>Cypripedium arietinum </em>in the Grand Sable Dunes, Pictured Rocks National Lakeshore, Michigan, USA. Data for <em>Cypripedium arietinum</em> was collected from 345, 1-m …
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Assessing wildlife habitat suitability for ecological sites and state and transition models
Wildlife habitat is an important component of rangeland management plans. Unfortunately, there are few practical tools to assist managers in understanding how management and environmental variation affects habitat suitability. Ecological site descriptions (ESDs) have the potential to fill this role …
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Predicting the ecological consequences of river management for a riverine cyprinid fish.
… be evidenced-based, current population and habitat models fail to incorporate fish behaviour and the interactions between fish and their environment, thus limiting their ability to predict management-relevant, population responses to environmental change. In order to address these …
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Influence Of Landscape Spatial Patterns And Land Use Planning On Grassland Bird Habitat Occupancy In Chester County, Pennsylvania
… guild. Grassland bird decline corresponds to habitat loss, landscape fragmentation, agricultural intensification, and changes in land management. In areas where farmland is being converted, the presence or absence of grassland birds can be used to assess the availability of habitat across the …
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The diversity and functioning of coastal microbial communities
… multiple spatial scales. Two different coastal habitats were used to create further distinctions. Random forest models were created with and without environmental measures and it was found that notable differences across domain, spatial scale, and habitat were only observed when environmental …
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Niche adaptations of the vibrionaceae, from the coastal ocean to the laboratory
… knowledge of the environmental conditions and habitats in which Vibrionaceae populations are found. Through a meta-analysis of Vibrio abundance and bulk environmental variables, I show that temperature and salinity are strong correlates of Vibrio, but the patterns vary among species. By …
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