کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4531588 1626095 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Developmental and spatial variations in the diet signatures of hyperbenthic shrimp Nauticaris marionis at the Prince Edward Islands based on stable isotope ratios and fatty acid profiles
ترجمه فارسی عنوان
تغییرات رشد و فضایی در امضاء رژیم غذایی میگوئه هیپربنتیک نئاتیکاس ماریونیس در جزایر پرنس ادوارد براساس نسبت ایزوتوپ پایدار و پروفیل اسید چرب
کلمات کلیدی
جزایر زیر قطب جنوب، وب غذایی، ردیاب ها، اقیانوس جنوبی، اندازه بدن، عمق
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی


• Caridean shrimps were collected from shelf waters around the Prince Edward Islands.
• Stable isotopes and fatty acids revealed variability in shrimp diets.
• Nearshore shrimp diets were influenced by kelp inputs.
• Shrimps increased trophic position with an increase in body size.
• Shrimp diet varied with region, depth, and body size.

The caridean shrimp Nauticaris marionis is an ecologically important species in the benthic community around the sub-Antarctic Prince Edward Islands (PEI) as it represents a key prey item for a variety of top predators breeding on the islands. We hypothesized that the diet of N. marionis shifts during its development, and that spatial variability in food availability results in differentiation in the diet signatures of specimens collected from various locations of the shelf waters around the PEI. Specimens were collected from nine stations (depth range 70 to 240 m) around the PEI at inter-island shelf (from west to east: upstream, between and downstream) and nearshore regions during austral autumn 2009. Stable isotope and fatty acid data both revealed spatial and developmental variations in the shrimp diet. Nearshore shrimp were more 13C-enriched than those from the inter-island region, suggesting increased kelp detritus entered the food web in the nearshore regions. The shrimp showed increases in δ13C and δ15N signatures (and trophic position) with an increase in body size, resulting in distinctions between size classes that reflected shifts in their trophic niche through development. The fatty acid profiles similarly indicated distinctions in diet with increased shrimp size (in the deep regions), and spatial variability was evident in relation to region and depth. All shrimp contained large proportions of polyunsaturated and essential fatty acids, indicating that the quality of food consumed was similar between regions despite the diet variability. Our results provide new dietary information about a key species operating near the base of the food web at the highly productive PEI, and show that there were no areas of enhanced nutrition available to the shrimp. As such, there was no nutritional advantage to shrimp inhabiting any specific region around the PEI.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Continental Shelf Research - Volume 118, 15 April 2016, Pages 1–10
نویسندگان
, , ,