نتایج جستجو برای: benthic

تعداد نتایج: 12009  

2016
Roberto Danovaro Massimiliano Molari Cinzia Corinaldesi Antonio Dell'Anno

Bacteria and archaea dominate the biomass of benthic deep-sea ecosystems at all latitudes, playing a crucial role in global biogeochemical cycles, but their macroscale patterns and macroecological drivers are still largely unknown. We show the results of the most extensive field study conducted so far to investigate patterns and drivers of the distribution and structure of benthic prokaryote as...

2012
Nichole N. Price Todd R. Martz Russell E. Brainard Jennifer E. Smith

Community structure and assembly are determined in part by environmental heterogeneity. While reef-building corals respond negatively to warming (i.e. bleaching events) and ocean acidification (OA), the extent of present-day natural variability in pH on shallow reefs and ecological consequences for benthic assemblages is unknown. We documented high resolution temporal patterns in temperature an...

Journal: :International journal of systematic and evolutionary microbiology 2005
Christina Lyra Maria Laamanen Jaana M Lehtimäki Anu Surakka Kaarina Sivonen

Diversity and ecological features of cyanobacteria of the genus Nodularia from benthic, periphytic and soil habitats are less well known than those of Nodularia from planktonic habitats. Novel benthic Nodularia strains were isolated from the Baltic Sea and their morphology, the presence of gas vacuoles, nodularin production, gliding, 16S rRNA gene sequences, rpoB, rbcLX and ndaF genes, and gvpA...

Journal: :Marine pollution bulletin 2015
Sophie M Vonk David J Hollander AlberTinka J Murk

During the Deepwater Horizon blowout, thick layers of oiled material were deposited on the deep seafloor. This large scale benthic concentration of oil is suggested to have occurred via the process of Marine Oil Snow Sedimentation and Flocculent Accumulation (MOSSFA). This meta-analysis investigates whether MOSSFA occurred in other large oil spills and identifies the main drivers of oil sedimen...

2004
Thomas M. Marchitto Peggy Delaney

[1] Benthic foraminiferal Cd/Ca is an important proxy for seawater paleonutrient concentrations and therefore deep ocean paleocirculation. Although previous work suggests that the incorporation of Cd into benthic foraminiferal calcite is insensitive to temperature, at least one species of planktonic foraminifer appears to be strongly influenced. The present study provides a closer look at the r...

Journal: :Science 2000
Lear Elderfield Wilson

A deep-sea temperature record for the past 50 million years has been produced from the magnesium/calcium ratio (Mg/Ca) in benthic foraminiferal calcite. The record is strikingly similar in form to the corresponding benthic oxygen isotope (delta(18)O) record and defines an overall cooling of about 12 degrees C in the deep oceans with four main cooling periods. Used in conjunction with the benthi...

2010
JESSICA M. WARD

1. Non-indigenous ecosystem engineers can substantially affect native biodiversity by transforming the physical structure of habitats. In the Great Lakes–St. Lawrence River system, introduced dreissenid mussels (Dreissena polymorpha and D. bugensis) and the native benthic macroalga Cladophora act as ecosystem engineers by increasing substratum complexity and providing interstitial habitat for b...

ژورنال: توسعه آبزی پروری 2019

This study carried out to investigate the fluctuation of benthic population in cages of rearing trout (Oncorhynchus mykiss, Walbaum, 1792) in depths of 30-25m of southern part of Caspian Sea at Nashtaroud region of Mazandaran province, This study was performed 150 days with measuring and evaluating physico-chmical factors of water during 5 phases up to the end of rearing period .Samples collect...

Journal: Geopersia 2017

Analysis of benthic foraminiferal assemblages was performed in Callovian deposits of the Farsian Formation Northeastern Alborz; Iran. The sequence of Callovian at the Goznawwi area consists mainly of soft marls , which contain high-diversity calcareous assemblages. In this foraminiferal succession nine morphogroups were differentiated according to shell architecture (general shape, mode of coil...

Journal: :Marine pollution bulletin 2004
Rutger Rosenberg Mats Blomqvist Hans C Nilsson Hans Cederwall Anna Dimming

The aim of this study is to develop a new method for classification of marine benthic quality according to the European Union Water Framework Directive. Tolerance values to environmental disturbance were determined in an objective analysis for benthic species along the Swedish west coast by using 4676 samples from 257 stations. Based on a combination of the species tolerance values, abundance a...

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