کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4531504 1626083 2016 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Community structure and trophic ecology of megabenthic fauna from the deep basins in the Interior Sea of Chiloé, Chile (41–43° S)
ترجمه فارسی عنوان
ساختار اجتماعات و اکولوژی تغذیه جانوران مگاکفزی حوضه عمیق در دریاهای داخلی Chiloé، شیلی (41-43 درجه سانتی S)
کلمات کلیدی
جانوران مگاکفزی ؛ مصب آب های عمیق؛ ساختار تغذیه ای؛ یارانه تغذیه؛ تجزیه و تحلیل ایزوتوپ پایدار؛ شیلی پاتاگونیا
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی


• We studied the community and trophic structure of deep water benthic communities in the interior sea of Chiloé.
• The benthic consumers are sustained mainly by photosynthetic primary production.
• The macroalgal subsidies could be incorporated to the diet of some invertebrate species.
• The benthic communities from the interior sea of Chiloé comprise among four and five trophic levels and have similar trophic structure among basins.

Estuarine environments are complex ecological systems, which depend on multiple inputs of organic sources that could support their benthic communities. The deep-water megabenthic communities of the Interior Sea of Chiloé (ISCh, northern part of the fjord region of Chile) were studied to characterize their taxonomic composition and to trace the energy pathways supporting them by using stable isotope analysis (SIA). Megabenthic and demersal organisms as well as sunken macroalgal debris and terrestrial organic matter (TOM: wood, leaves, branches) were obtained by bottom trawling along an estuarine gradient covering 100–460 m water depth. Additionally, particulate organic matter (POM) and the sedimentary organic matter (SOM) were sampled and carbon (δ13C) and nitrogen (δ15N) isotope ratios were determined for all these organisms and potential food sources. A total of 140 taxa were obtained, including invertebrates (e.g. polychaetes, mollusks, crustaceans and echinoderms) bony fishes, rays and sharks. Based on the stable isotope values it was possible to infer a strong dependence on primary production derived from phytoplankton which is exported to the benthos. A potentially important contribution from sunken macroalgae to megabenthic consumers was established only for some invertebrates, such as the irregular echinoid Tripylaster philippii and the decapod Eurypodius latreillii. The trophic structure metrics suggest a similar isotopic niche width, trophic diversity and species packaging in the food webs among the major basins in the ISCh. It is thus concluded that the benthic food webs are supported principally by surface primary production, but macroalgal subsidies could be exploited by selected invertebrate taxa (e.g. detritivores) and terrestrial carbon pathways are important for certain specialized taxa (e.g. Xylophaga dorsalis).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Continental Shelf Research - Volume 130, 1 November 2016, Pages 47–67
نویسندگان
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