Mesozoic Terrestrial Ecosystems and Biota
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Terrestrial discharges mediate trophic shifts and enhance methylmercury accumulation in estuarine biota
The input of mercury (Hg) to ecosystems is estimated to have increased two- to fivefold during the industrial era, and Hg accumulates in aquatic biota as neurotoxic methylmercury (MeHg). Escalating anthropogenic land use and climate change are expected to alter the input rates of terrestrial natural organic matter (NOM) and nutrients to aquatic ecosystems. For example, climate change has been p...
متن کاملUnexpected Early Triassic marine ecosystem and the rise of the Modern evolutionary fauna
In the wake of the end-Permian mass extinction, the Early Triassic (~251.9 to 247 million years ago) is portrayed as an environmentally unstable interval characterized by several biotic crises and heavily depauperate marine benthic ecosystems. We describe a new fossil assemblage-the Paris Biota-from the earliest Spathian (middle Olenekian, ~250.6 million years ago) of the Bear Lake area, southe...
متن کاملA new global palaeobiogeographical model for the late Mesozoic and early Tertiary.
Late Mesozoic palaeobiogeography has been characterized by a distinction between the northern territories of Laurasia and the southern landmasses of Gondwana. The repeated discovery of Gondwanan lineages in Laurasia has led to the proposal of alternative scenarios to explain these anomalous occurrences. A new biogeographical model for late Mesozoic terrestrial ecosystems is here proposed in whi...
متن کاملExternal radiation doses to important organs in biota: Monte Carlo dose model calculations
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...
متن کاملThe Impact of Mycorrhizosphere Bacterial Communities on Soil Biofunctioning in Tropical and Mediterranean Forest Ecosystems
Mycorrhizal fungi constitute a key functional group of soil biota that greatly contribute to productivity and sustainability of terrestrial ecosystems. These are ubiquitous components of most of the ecosystems throughout the world and are considered key ecological factors in governing the cycles of major plant nutrients and in sustaining the vegetation cover (van der Hejden eta!. 1998; Requena ...
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