نتایج جستجو برای: habitat evaluation

تعداد نتایج: 876723  

Journal: :Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 2015

Journal: :Revista de biologia tropical 2014
Consuelo Lorenzo Eugenia C Sántiz Darío A Navarrete Jorge Bolaños

Land use changes by human activities have been the main causes of habitats and wildlife population degradation. In the Tehuantepec Isthmus in Oaxaca, the tropical habitat of the porcupine Sphiggurus mexicanus has been subject to vegetation and land use changes, causing its reduction and fragmentation. In this study, we estimated vegetation cover and land use (δn) change rates and assessed habit...

2012
Casey A. Lott Robert L. Wiley David Miller

This report describes Least Tern (Sternula antillarum) sandbar nesting habitat (SNH) on the Arkansas River below Keystone Dam from field and GIS measurements after the 2008 nesting season. This season was preceded by 2 years with high-magnitude, long-duration dam releases (>50,000 cfs for >3 weeks), which resulted in major habitat renewal; replacing small, low-elevation sandbars that were mostl...

2011
Jae Hoon Lee Jeong-Ho Han Hema K. Kumar Jun-Kil Choi Hwa Kun Byeon Jaeseok Choi Jai-Ku Kim Min-Ho Jang Hae-Kyung Park Kwang-Guk An

The objectives of this study were to evaluate fish guild compositions and national river health using a multi-metric model of the Korean index of biological integrity using fishes (K-IBIF) in four major Korean watersheds along with water chemistry and habitat quality. Tolerant and omnivore fish species dominated all the watersheds, and the proportions of tolerance guilds and trophic guilds refl...

2016
Christopher A. Jordan Cody J. Schank Gerald R. Urquhart Armando J. Dans

Central America is experiencing rapid forest loss and habitat degradation both inside and outside of protected areas. Despite increasing deforestation, the Caribbean region of Nicaragua plays an important role in the survival or extinction of large mammal populations in Central America given that it still retains core areas of habitat for large mammal species. The proposed interoceanic canal pr...

Journal: :Journal of environmental management 2009
Thomas K Alexandridis Efthalia Lazaridou Anastasia Tsirika George C Zalidis

The European Habitats Directive 92/43/EEC has defined the need for the conservation of habitats and species with the adoption of appropriate measures. Within the Natura 2000 ecological network of special areas of conservation, natural habitats will be monitored to ensure the maintenance or restoration of their composition, structure and extent. The European Space Agency's GlobWetland project ha...

اکبری, حسن, موسوی‌, سید جلال, حبیبی پور, اعظم,

Chinkara is classified as a vulnerable species (IUCN, 2009). Yet, there is a little information on its biological characteristics and habitat in Iran. This study focuses on the habitat preference and social pattern of this species in Dareh-Anjeer wildlife refuge in 2010-2011. We first determined habitat boundaries of Chinkara in the area. During the survey, 15 transects were located within diff...

2018
James H. Cowan Kenneth A. Rose

There are over 2300 standing oil and gas platforms in the northern Gulf of Mexico (GOM). It has been argued that platforms provide reef-like habitat that increases the growth and survival rates of fishes by increasing prey availability and affording shelter for protection from predators, provide additional spawning substrate, and by acting as a visual attractant for organisms not otherwise depe...

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