نتایج جستجو برای: stable isotopes analysis
تعداد نتایج: 3039613 فیلتر نتایج به سال:
Terrestrial spiders transfer methyl mercury (MeHg) to terrestrial consumers such as birds, but how spiders become contaminated with MeHg is not well understood. In the present study, the authors used stable isotopes of nitrogen in combination with MeHg to determine the source of MeHg to terrestrial long-jawed orb weaver spiders (Tetragnatha sp). The authors collected spiders and a variety of ot...
Although many species of tumbling ßower beetles (Coleoptera: Mordellidae) are common and abundant, little is known of their life histories. Larvae of most species seem to be phytophagous, and acts of predation are considered rare and accidental. In this study, we dissected host plants of the endophytic mordellid Mordellistena aethiops Smith and subjected plant and insect samples to stable isoto...
Article history: The polar foraminifera Ne Received 17 March 2008 Received in revised form 18 November 2008 Accepted 20 November 2008 Available online 13 January 2009 Editor: P. DeMenocal
Population genomic studies of ancient human remains have shown how modern-day European population structure has been shaped by a number of prehistoric migrations. The Neolithization of Europe has been associated with large-scale migrations from Anatolia, which was followed by migrations of herders from the Pontic steppe at the onset of the Bronze Age. Southwestern Europe was one of the last par...
Much research has focused on identifying species that are susceptible to extinction following ecosystem fragmentation, yet even those species that persist in fragmented habitats may have fundamentally different ecological roles than conspecifics in unimpacted areas. Shifts in trophic role induced by fragmentation, especially of abundant top predators, could have transcendent impacts on food web...
Establishing patterns of movement of wild animals is crucial for our understanding of their ecology, life history and behavior, and is a prerequisite for their effective conservation. Advances in the use of stable isotope markers make it possible to track a diversity of animal species in a variety of habitats. This approach is revolutionizing the way in which we make connections between phases ...
Mesofauna taxa fill key trophic positions in soil food webs, even in terrestrial-marine boundary habitats characterized by frequent natural disturbances. Salt marshes represent such boundary habitats, characterized by frequent inundations increasing from the terrestrial upper to the marine pioneer zone. Despite the high abundance of soil mesofauna in salt marshes and their important function by...
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