کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9480812 | 1326777 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Stable isotope analysis of some representative fish and invertebrates of the Newfoundland and Labrador continental shelf food web
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Stable isotope analysis of some representative fish and invertebrates of the Newfoundland and Labrador continental shelf food web Stable isotope analysis of some representative fish and invertebrates of the Newfoundland and Labrador continental shelf food web](/preview/png/9480812.png)
چکیده انگلیسی
We examined stable carbon and nitrogen isotopic signatures of 17 fish and 16 invertebrate taxa common to the Newfoundland and Labrador (NL) continental shelf food web. Particular sampling emphasis was placed on Atlantic cod (Gadus morhua) and related prey species (e.g. shrimp, Pandalus borealis, and capelin, Mallotus villosus). We found highly significant (p < 0.0001) differences between near-shore (bays) and offshore (shelf edge) δ15N signatures for cod, 'other fish' (pooled) and invertebrates (pooled). In contrast, there were only minor differences in δ13C signatures of 'other fish' (p < 0.05) and no difference for cod and invertebrates among the two habitats. We sampled at two times of the year (January and June) and found no systematic effect of season on both δ13C and δ15N in cod, 'other fish' and invertebrates. We calculated isotopic fractionation factors for cod from the entire shelf (mixed diet) and for cod with diets composed mainly of capelin or shrimp. These values ranged between 2.2â° and 3.9â° for δ15N and â0.4â° and 0.8â° for δ13C and, for δ15N, may reflect diet-related differences in bioenergetic status. We discuss potential mechanisms for near-shore versus offshore enrichment of δ15N signatures, and demonstrate the implications of this spatial variation on δ15N-derived trophic position estimates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 63, Issue 4, June 2005, Pages 537-549
Journal: Estuarine, Coastal and Shelf Science - Volume 63, Issue 4, June 2005, Pages 537-549
نویسندگان
Graham D. Sherwood, George A. Rose,