کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5766181 1627560 2017 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Macrobenthos and megabenthos responses to long-term, large-scale hypoxia on the Louisiana continental shelf
ترجمه فارسی عنوان
واکنش ماکروبنتوز و مگابنتس به هیپوکسی بلند مدت در مقیاس بزرگ در قفسه قاره لوئیزیانا
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
چکیده انگلیسی
The macrobenthos and megabenthos responses to long-term, recurring hypoxia on the Louisiana continental shelf were compared at four locations with different historical (2000-2010) episodes of annual exposure to bottom-water hypoxia. Measurements of abundance, biomass, species diversity, and community composition of the two size classes of benthos suggested that the macrobenthic response is driven chiefly by tolerance to hypoxia, whereas the megabenthic response was affected by the ability to migrate and the availability/unavailability of macrobenthos prey at the sediment surface. The site exposed to the historically lowest average bottom-water dissolved oxygen (BWDO) concentration exhibited the lowest species diversity for macrobenthos and the highest species diversity for megabenthos, exemplifying the differential effects of hypoxia on different size classes. The high diversity and smaller average size of the megabenthos at the lowest DO site was due to high abundance of invertebrates and a preponderance of small, less vagile fishes that appeared to remain in the area after larger dominant sciaenids had presumably emigrated. The average size and the depth of habitation in the sediment of macrobenthos prey may have also influenced the abundance and biomass of megabenthos foragers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Environmental Research - Volume 123, February 2017, Pages 38-52
نویسندگان
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