نتایج جستجو برای: habitat changes

تعداد نتایج: 918380  

Journal: :The American naturalist 2015
Carolina Reigada Sebastian J Schreiber Florian Altermatt Marcel Holyoak

A challenge for conservation management is to understand how population and habitat dynamics interact to affect species persistence. In real landscapes, timing and duration of disturbances can vary, and species' responses to habitat changes will depend on how timing of dispersal and reproduction events relate to the landscape temporal structure. For instance, increasing disturbance frequency ma...

2014
S. M. Larocque C. Hatry E. C. Enders Eva C. Enders

Larocque, S.M., Hatry, C., and Enders, E.C. 2014. Development of habitat suitability indices and bioenergetics models for Arctic grayling (Thymallus arcticus). Can. Tech. Rep. Fish. Aquat. Sci. 3097: vi + 57 p. Fish habitat models are often used as tools to evaluate habitat quality for aquatic organisms. Habitat suitability indices are a commonly used in habitat models, while others, such as bi...

2009
MILAN J. MITROVICH JAY E. DIFFENDORFER ROBERT N. FISHER

—Habitat fragmentation is a significant threat to biodiversity worldwide. Habitat loss and the isolation of habitat fragments disrupt biological communities, accelerate the extinction of populations, and often lead to the alteration of behavioral patterns typical of individuals in large, contiguous natural areas. We used radio-telemetry to study the space-use behavior of the Coachwhip, a larger...

2018
Chantel E Markle Gillian Chow-Fraser Patricia Chow-Fraser

Point Pelee National Park, located at the southern-most tip of Canada's mainland, historically supported a large number of herpetofauna species; however, despite nearly a century of protection, six snake and five amphibian species have disappeared, and remaining species-at-risk populations are thought to be in decline. We hypothesized that long-term changes in availability and distribution of c...

2014
Laura Cardador Miquel De Cáceres Gerard Bota David Giralt Fabián Casas Beatriz Arroyo François Mougeot Carlos Cantero-Martínez Judit Moncunill Simon J. Butler Lluís Brotons

European agriculture is undergoing widespread changes that are likely to have profound impacts on farmland biodiversity. The development of tools that allow an assessment of the potential biodiversity effects of different land-use alternatives before changes occur is fundamental to guiding management decisions. In this study, we develop a resource-based model framework to estimate habitat suita...

2017
Stanley Thomas THOMAS R. STANLEY

Many methods have been used to survey red fox (Vulpes vulpes) and gray fox (Urocyon dnereoargenteus) populations. However, none has proven entirely satisfactory, and wild foxes remain one of the most difficult economically important wildlife species to monitor. In this study we evaluated the reliability of a snow track survey method for foxes by investigating whether the average number of road ...

Journal: :Int. J. Applied Earth Observation and Geoinformation 2015
Harini Nagendra Paola Mairota Carmela Marangi Richard M. Lucas Panayotis Dimopoulos João P. Honrado Madhura Niphadkar Caspar A. Mücher Valeria Tomaselli Maria Panitsa Cristina Tarantino Ioannis Manakos Palma Blonda

Protected areas are experiencing increased levels of human pressure. To enable appropriate conservation action, it is critical to map and monitor changes in the type and extent of land cover/use and habitat classes, which can be related to human pressures over time. Satellite Earth observation (EO) data and techniques offer the opportunity to detect such changes. Yet association with field info...

Journal: :Proceedings of the Royal Society of London. Series B: Biological Sciences 1998

Journal: :محیط زیست طبیعی 0
آصف درویشی دانشجوی کارشناسی ارشد محیط زیست دانشکدۀ منابع طبیعی دانشگاه صنعتی اصفهان سیما فاخران استادیار گروه محیط زیست دانشکدۀ منابع طبیعی دانشگاه صنعتی اصفهان علیرضا سفیانیان استادیار گروه محیط زیست دانشکدۀ منابع طبیعی دانشگاه صنعتی اصفهان مهدی قربانی استادیار گروه مرتع و آبخیزداری دانشکدۀ منابع طبیعی دانشگاه تهران

large scale land use/cover changes and habitat fragmentation is a major factor in the distribution and functioning of ecosystems. for analysis the relationship between land use changes and their impacts on biodiversity, land cover and land use information is needed at different scales. the main goal of this study was to quantify the land use/ cover changes in arasbaran biosphere reserve, northw...

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