نتایج جستجو برای: biota
تعداد نتایج: 5026 فیلتر نتایج به سال:
The Guanshan Biota (Cambrian Series 2, Stage 4) is a typical Burgess Shale-type biota and one of the most significant Cambrian Konservat-Lagerstätten from China. Tuzoia relatively common non-biomineralized bivalved arthropod and, stratigraphically, ranges 2 through Miaolingian Series. Based on new specimens Longbaoshan Section Wulongqing Formation, this study distinguished described in detail B...
Recent studies assessing the role of biological diversity for ecosystem functioning indicate that the diversity of functional traits and the evolutionary history of species in a community, not the number of taxonomic units, ultimately drives the biodiversity--ecosystem-function relationship. Here, we simultaneously assessed the importance of plant functional trait and phylogenetic diversity as ...
A biokinetic modelling approach, able to simulate dynamically the uptake and turnover of radionuclides by biota, was applied to the eastern Irish Sea coast case study which has recently been assessed using the non-dynamic, concentration factor (CF)-based ERICA methodology (Hosseini et al., 2007). An additional case study of short-term pulsed discharges has also been used to demonstrate the usef...
Ecological science has been shaped largely by the biological sciences. Environmental science, on the other hand, has been shaped largely by the physical sciences and engineering. With the beginning of interdisciplinary efforts between the two fields, some of the fundamental differences between them are generating conflicts caused more by misunderstanding of basic concepts than by any difference...
The conservation of biodiversity on small islands is fraught with challenges, most of which do not apply to mainland areas, and which are borne of characteristics unique to islands. These include a disproportionate coastal extent, anomalously high rates of endemicity and species richness, high degrees of genetic distinctiveness exhibited by biota as a result of their physical isolation. This is...
In this paper, we develop a five-step approach for analysis of historical relationships among areas of endemism using a set of 22 clades (9 mammal, 7 bird, 4 reptile, 1 amphibian, and 1 cactus) drawn from the warm deserts biota of western North America. As has been suggested in previous studies of portions of this biota, our results suggest a complex biogeographic history, but with substantial ...
Bioaccumulation factors (BAFs) and biota-sediment accumulation factors (BSAFs) are frequently used to predict contaminant bioaccumulation in risk assessments. Development of these parameters is often hindered by uncertainty regarding the spatial scale of contaminant transfer from sediments to biota. We present a simple statistical method for optimizing bioaccumulation parameters (BAF and BSAF) ...
Ecosystem uptake and transfer processes of Sellafield-derived radiocarbon (14C) within the Irish Sea were examined. Highly variable activities in sediment, seawater and biota indicate complex 14C dispersal and uptake dynamics. All east basin biota exhibited 14C enrichments above ambient background while most west basin biota had 14C activities close to background, although four organisms includ...
Very few principles have been unraveled that explain the relationship between soil properties and soil biota across large spatial scales and different land-use types. Here, we seek these general relationships using data from 52 differently managed grassland and forest soils in three study regions spanning a latitudinal gradient in Germany. We hypothesize that, after extraction of variation that...
Specific goals The new radiological protection system for the environment increases the need to estimate radiation doses to non-human biota in their specific environment. Therefore, reliable and realistic dose models are needed in risk assessments of biota. Current dose models for biota (e.g. ERICA, 2007) have been developed mainly to be used as a screening tool for the assessor and little guid...
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