نتایج جستجو برای: biotic index
تعداد نتایج: 408379 فیلتر نتایج به سال:
The present study was conducted for the first time to investigate and identify the ecological quality status (EcoQ) of Gorgan Bay and also to emphasize the degree of agreement between the results of different benthic macrofauna indices, introduction of appropriate index and utilization of basic results in environmental management programs in the region. To do, 22 sites were selected and macrobe...
The level of biotic organization may be considered from different perspectives and these are briefly outlined. A merely structural level of the individuals is the most traditional approach, but it must be considered that there is a basic difference between a simple structure that is actually primitive and such highly evolved conditions as obtain in some parasitic or symbiotic organisms. Other l...
Biological functions of antibiotics are not limited to killing. The most likely function of antibiotics in natural microbial ecosystems is signaling. Does this signaling function of antibiotics also extend to the eukaryotic - in particular mammalian - cells? In this review, the host modulating properties of three classes of antibiotics (macrolides, tetracyclines, and β-lactams) will be briefly ...
nouns – ‘hierarchy’, ‘connec-tivity’, ‘evolvability’, ‘complexity’ toname four – are becoming increasinglypopular as evolutionary developmentalbiology tries to find its theoretical feet.With Gerhard Schlosser, an amphibiandevelopmental biologist, GünterWagner has brought together a stellarteam of contributors to discuss theabstract noun du jour, ‘modularity.’...
Urbanization and loss of natural habitat has resulted in cities being identified as ecosystems capable of sustaining biotic communities and diversity. This study measured bird species diversity at Vadakkechira pond and surrounding areas during the period 2002-2009. This habitat is situated right in the heart of the city of Thrissur which is renowned for its historic importance and cultural extr...
Large-scale geographical patterns of biotic specialization and the underlying drivers are poorly understood, but it is widely believed that climate plays an important role in determining specialization. As climate-driven range dynamics should diminish local adaptations and favor generalization, one hypothesis is that contemporary biotic specialization is determined by the degree of past climati...
We assessed if the relative importance of biotic and abiotic factors for plant community composition differs along environmental gradients and between functional groups, and asked which implications this may have in a warmer and wetter future. The study location is a unique grid of sites spanning regional-scale temperature and precipitation gradients in boreal and alpine grasslands in southern ...
We compare foraminifera and macrofauna as bio-indicators of oil-based drill mud disposal site off Congo. The most polluted sites are characterized by poor faunas, dominated by some very tolerant taxa. Slightly further from the disposal site, there is an area with strongly increased densities, heavily dominated by opportunistic taxa. Still further, macrofauna appears to be similar to that at the...
The ecological quality status (EcoQ) of intertidal mudflats constrained by Pacific oyster farming was assessed by single (H', AMBI, BENTIX and BOPA) and multimetric (M-AMBI and average score) index approaches in the Pertuis Charentais (SW France). Fifteen sampling stations were monitored seasonally for sedimentological features and macrozoobenthos in 2004. Sediments affected by oyster biodeposi...
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