نتایج جستجو برای: ecoregion
تعداد نتایج: 734 فیلتر نتایج به سال:
Functional diversity represents a measure of diversity that incorporates the role of species in an ecosystem, and therefore its dynamics and resilience. Assessing its drivers and spatial variation represents an important step forward in our understanding of functional ecosystem dynamics and it is also necessary to achieve a comprehensive conservation planning. In this paper, we assessed mammal ...
Grasslands are the most threatened and least protected biome. Yet, no study has been conducted to identify last remaining continuous grasslands on Earth. Here, we used World Wildlife Fund (WWF) International Union for Conservation of Nature (IUCN) classifications measure degree intactness world's grassland ecoregions. This analysis revealed three findings critical conservation importance. First...
Parasitic nematodes that infect quail have been understudied and long been dismissed as a problem in quail management. Within the Rolling Plains ecoregion of Texas, an area that has experienced quail population "boom and bust" cycles and ultimately a general decline, the need to determine why Northern bobwhite (Colinus virginianus) populations are diminishing has increased in priority. Previous...
We assess progress toward the protection of 50% of the terrestrial biosphere to address the species-extinction crisis and conserve a global ecological heritage for future generations. Using a map of Earth's 846 terrestrial ecoregions, we show that 98 ecoregions (12%) exceed Half Protected; 313 ecoregions (37%) fall short of Half Protected but have sufficient unaltered habitat remaining to reach...
Small pelagic fish (SPF) play an important ecological role by facilitating energy transfer in marine ecosystems, from lower to higher trophic levels. The Celtic Seas ecoregion is home several economically SPF that spend some or all their life these waters. In recent decades, major changes the relative abundances of 6 main region (anchovy, herring, horse mackerel, sardine, and sprat) have been o...
Although many studies on the taxonomy of digenean trematodes of marine fishes have been completed in the Eastern Indo-Pacific (EIP) marine ecoregion, only a few have considered metacercarial stages. Here, the results are presented of a taxonomic survey of the digenean metacercariae of fishes from Palmyra Atoll, a remote and relatively pristine US National Wildlife Refuge located 1680 km SSW of ...
The complex topography and climate history of western North America offer a setting where lineage formation, accumulation and migration have led to elevated inter- and intraspecific biodiversity in many taxa. Here, we study Ramalina menziesii, an epiphytic lichenized fungus with a range encompassing major ecosystems from Baja California to Alaska to explore the predictions of two hypotheses: (i...
This study is part of ongoing research efforts aimed to developing Earth Observation (EO) strategies towards the implementation of the Water Framework Directive (WFD), ensuring systematic monitoring of water quality in the largest lakes of the Subalpine ecoregion (northern Italy). To the aim the Medium Resolution Imaging Spectrometer (MERIS) Full resolution (FR) data offer an excellent choice. ...
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