کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4550322 1328146 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure of a northwest Atlantic Shelf macrofaunal assemblage with respect to seasonal variation in sediment nutritional quality
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
پیش نمایش صفحه اول مقاله
Structure of a northwest Atlantic Shelf macrofaunal assemblage with respect to seasonal variation in sediment nutritional quality
چکیده انگلیسی

We examined temporal variation in the relationship between benthic macrofaunal assemblage structure and sediment nutritional quality using core samples taken seasonally from a 232-m deep site in Wilkinson Basin, Gulf of Maine, from October 2003 through August 2004. The benthic assemblage was dominated by deposit-feeding polychaetes of the families Cirratulidae, Paraonidae, and Cossuridae. Assemblage composition and abundance remained relatively constant over the course of the study, despite seasonal changes in sediment nutritional quality. Constant seawater temperatures and/or relatively long species generation times may account for this pattern. Sediment depth-frequency distributions of cirratulid and paraonid polychaetes varied temporally and exhibited subsurface abundance peaks; depth-frequency distributions of cossurid polychaetes, in contrast, were temporally stable. Subsurface peaks of plant pigment concentrations matched those of the cirratulid and cossurid polychaetes, suggesting that these groups transport and cache recently deposited phytodetritus below the sediment surface. This subsurface caching may ameliorate the effects of a seasonally variable food supply, damping any seasonal response of the fauna.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Sea Research - Volume 60, Issue 3, October 2008, Pages 164–175
نویسندگان
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