نتایج جستجو برای: benthic

تعداد نتایج: 12009  

2017
Maria T Kavanaugh Jennie E Rheuban Kelly M A Luis Scott C Doney

The U.S. Northeast Continental Shelf is experiencing rapid warming, with potentially profound consequences to marine ecosystems. While satellites document multiple scales of spatial and temporal variability on the surface, our understanding of the status, trends, and drivers of the benthic environmental change remains limited. We interpolated sparse benthic temperature data along the New Englan...

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2004
M Callisto M Goulart A O Medeiros P Moreno C A Rosa

The main goals of this study were: 1) to evaluate the structure, diversity, and functional trophic group composition of benthic macroinvertebrate communities; 2) to characterize water quality in the headwaters of the Doce river watershed, based on physical, chemical, and biological parameters (benthic macroinvertebrates, fecal coliforms, heterotrophic bacteria, and yeasts); and 3) to contribute...

Journal: :Journal of experimental marine biology and ecology 2000
Norkko Bonsdorff Norkko

Patchy occurrences of benthic drift algae (i.e. loose lying macroalgal mats) may increase habitat complexity on normally bare soft bottoms, but at the same time, extensive amounts of drifting algal mats are known to stress the benthic fauna. This paper presents results of the first detailed study of the fauna associated with drift algal mats in the northern Baltic Sea. In order to assess the im...

Journal: :رخساره های رسوبی 0
مرتضی احمدی محمد وحیدی نیا علیرضا عاشوری

abtalkh formation is a part of late cretaceous sedimentary unit in the kopet- dagh basin, ne iran. this study deals with the study of this formation in the eastern parts of the basin in padeha village. it thickness is about 991m, and lithologically consists of grey, greyish to blue shale and marl. the lower contact with abderaz formation is conformable and transitional, but the upper boundary w...

Journal: :iranian journal of science and technology (sciences) 2012
e. nafarieh

biofacies and palaeoecology of the limestone of the jahrum formation in the lar area in the southwest of iran (zagros basin) is addressed in this paper. our detailed analysis of biofacies and palaeoecology shows that the jahrum formation in the studied area were deposited in a carbonate open shelf dominated by heterozoan and, subordinately, photozoan skeletal assemblages. based on analysis of l...

Journal: :محیط زیست طبیعی 0
علی رضا میرزاجانی عضو هیئت علمی مؤسسۀ تحقیقات علوم شیلاتی کشور ـ پژوهشکدۀ آبزی پروری آب های داخلی (بندر انزلی) احمد قانع عضو هیئت علمی مؤسسۀ تحقیقات علوم شیلاتی کشور ـ پژوهشکدۀ آبزی پروری آب های داخلی (بندر انزلی) سید حجت خداپرست عضو هیئت علمی مؤسسۀ تحقیقات علوم شیلاتی کشور ـ پژوهشکدۀ آبزی پروری آب های داخلی (بندر انزلی) سیدقاسم قربانزاده زعفرانی گروه اکولوژی دریا ـ معاونت محیط زیست دریایی سازمان حفاظت محیط زیست امید صدیقی سوادکوهی گروه اکولوژی دریا ـ معاونت محیط زیست دریایی سازمان حفاظت محیط زیست

the coastal areas are highly productive system that is degrading due to receiving huge amount of various pollutants. despite of the important of north caspian sea estuaries the quality index of benthic fauna received less attention. in this survey the benthic population of 18 rivers estuaries in southern caspian sea were investigated. the benthic sampling and identification were conducted at ei...

Journal: :Environmental toxicology and chemistry 2004
Bruce Thompson Sarah Lowe

A multimetric benthic assessment method was developed for two benthic assemblages in the San Francisco Estuary (USA) using data from several monitoring programs collected over five years. Assessment indicators used were total number of taxa, total abundances, oligochaete abundances, number of molluscan taxa, number of amphipod taxa, and Capitella capitata and Streblospio benedicti abundances. E...

2013
Megan L Head Genevieve M Kozak Janette W Boughman

Female mate preferences for ecologically relevant traits may enhance natural selection, leading to rapid divergence. They may also forge a link between mate choice within species and sexual isolation between species. Here, we examine female mate preference for two ecologically important traits: body size and body shape. We measured female preferences within and between species of benthic, limne...

2006
CRISTINA BARRÓN CARLOS M. DUARTE ALBERTO VIEIRA BORGES

We measured monthly dissolved oxygen (DO) changes in situ benthic incubations from March 2001 to October 2002 in a Posidonia oceanica meadow and unvegetated sediments of Magalluf Bay (Mallorca Island, Spain) to determine gross primary production (GPP), community respiration (R), and net community production (NCP). From June 2001 to October 2002, we also measured fluxes of dissolved inorganic ca...

2008
Ronnie N. Glud Bradley D. Eyre Nicole Patten

Coral mass-spawning represents a spectacular annual, short-term, fertilization event of many oligotrophic reef communities. The spawning event in 2005 at Heron Island, Great Barrier Reef, was followed by an intense bloom of benthic dinoflagellates. Within a day from the first observed spawning, the primary production of the water column and the benthic compartment increased by factors of 4 and ...

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