نتایج جستجو برای: habitat changes

تعداد نتایج: 918380  

Journal: :Ecology letters 2016
Claire Fortunel C E Timothy Paine Paul V A Fine Italo Mesones Jean-Yves Goret Benoit Burban Jocelyn Cazal Christopher Baraloto

Understanding the mechanisms generating species distributions remains a challenge, especially in hyperdiverse tropical forests. We evaluated the role of rainfall variation, soil gradients and herbivory on seedling mortality, and how variation in seedling performance along these gradients contributes to habitat specialisation. In a 4-year experiment, replicated at the two extremes of the Amazon ...

2008
Guillermo Fernández David B. Lank

– Many shorebirds are Nearctic-Neotropical migrants that move from their northern breeding grounds to wintering areas in Central and South America. Shorebirds differ from many other groups of avian migrants by their extremely long and demanding flights, gregariousness, restriction to limited numbers of sites, long lifespans, and low recruitment. Migration monitoring data suggest that population...

Journal: :Environmental management 2005
Dave Cacela Joshua Lipton Douglas Beltman James Hansen Robert Wolotira

Habitat equivalency analysis (HEA) was developed as a tool to scale mitigation or restoration when habitat is contaminated by hazardous substances or has been otherwise harmed by anthropogenic activities. Applying HEA involves balancing reductions in habitat quality against gains from restoration actions, and quantifying changes in habitat quality in terms of ecological services. We propose a f...

2017
Ulya Bayram Ruichen Sun William Lee

Modeling migratory paths of birds is an emerging area of complexity science in which attracts interdisciplinary collaborations from ornithologists, computer scientists, epidemiologist, and policy makers. However, due to the unpredictability of climate and habitat changes, our understanding of bird migratory paths is still limited. Not accounting for environmental changes when modeling bird migr...

2003
Niels Martin Schmidt

The potential consequences of anthropogenic habitat fragmentation on species diversity and extinction have drawn considerable attention in recent decades. In many cases, traditional island biogeography theory has been applied to explain the observed patterns. Here, we propose that habitat fragmentation as a selective force can be traced in mammalian body length changes. By exploring historical ...

Journal: :Biology letters 2008
David A Keith H Resit Akçakaya Wilfried Thuiller Guy F Midgley Richard G Pearson Steven J Phillips Helen M Regan Miguel B Araújo Tony G Rebelo

Species responses to climate change may be influenced by changes in available habitat, as well as population processes, species interactions and interactions between demographic and landscape dynamics. Current methods for assessing these responses fail to provide an integrated view of these influences because they deal with habitat change or population dynamics, but rarely both. In this study, ...

2005
Adam E. Cohen Dean A. Hendrickson Camille Parmesan Jane C. Marks

Herichthys minckleyi is an endangered, trophically polymorphic cichlid endemic to the Cuatro Ciénegas basin of Coahuila, Mexico. A molariform morph has stout pharyngeal teeth whereas a papilliform morph has numerous fine pharyngeal teeth. Individuals with intermediate pharyngeal dentition also exist, as does yet another morph, called piscivore. Previous studies indicated that morphs utilize dif...

2012
Alyson F. Webber

Habitat selection during the breeding season has important consequences for reproductive success and, in seasonal and heterogeneous environments, most likely occurs on several temporal and spatial scales. I examined several possible topographical, substrate and vegetation, as well as anthropological effects on snowy plover (Charadrius alexandrinus) habitat selection across pre-breeding and bree...

Journal: :Ecology 2016
Lauren A Yeager Danielle A Keller Taylor R Burns Alexia S Pool F Joel Fodrie

Habitat fragmentation involves habitat loss concomitant with changes in spatial configuration, confounding mechanistic drivers of biodiversity change associated with habitat disturbance. Studies attempting to isolate the effects of altered habitat configuration on associated communities have reported variable results. This variability may be explained in part by the fragmentation threshold hypo...

Forage is one of the main products of rangeland ecosystems, which is threatened by different anthropogenic disturbances. This study was conducted to assess the impact of urbanization, rural development, agriculture extension, road construction and industry on forage production in an arid and semiarid rangeland using InVEST habitat quality model in spring 2018. In 14 rangeland types, thirty 2×1m...

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