کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5741436 1617121 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Original ArticleTrophic structures in tropical marine ecosystems: a comparative investigation using three different ecological tracers
ترجمه فارسی عنوان
سازه های اصلی مقاله در ساختارهای اکوسیستم دریایی گرمسیری: یک مطالعه مقایسه ای با استفاده از سه تکه های مختلف اکولوژیکی
کلمات کلیدی
ایزوتوپهای پایدار، اسیدهای چرب، جیوه، وب غذای گرمسیری، اقیانوس هند،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


- We compared trophic structures provided by stable isotopes, fatty acids and mercury.
- At individual level, trophic structures and positions are close.
- At species level, some inconsistencies appear in middle trophic levels.
- Data obtained earlier in nutritional/food security studies can be used in ecology.

We looked at how three ecological tracers may influence the characterization and interpretation of trophic structures in a tropical marine system, with a view to informing tracer(s) selection in future trophic ecology studies. We compared the trophic structures described by stable isotope compositions (carbon and nitrogen), the total mercury concentration (THg) and levels of essential fatty acids (EFA) at both the individual and species level. Analyses were undertaken on muscle tissue samples from fish and crustacean species caught in the waters surrounding the Seychelles. The carbon isotope composition (δ13C) correlated to the proportion of arachidonic acid (ARA), whereas the nitrogen isotope composition (δ15N) correlated to the proportion of docosahexaenoic acid (DHA) and THg. At the individual level, trophic position obtained with these three last tracers are similar. In contrast, the eicosapentaenoic acid (EPA) was not clearly correlated to any of the tracers. At the species level, the use of EFA (ARA and DHA), as compared to stable isotopes, resulted in slight structural modifications, mainly in the middle trophic levels. For example, the EFA overestimated the trophic positions of Thunnus alalunga and Etelis coruscans but underestimated the trophic positions of other snappers and groupers. While ARA mainly originates from coastal/benthic areas, DHA is conserved throughout the food web and may be used as a proxy indicator of trophic position. However, metabolic disparities can affect ecological tracers and in turn, distort the trophic structures derived from their results. This is especially true for species with close trophic ecologies. Despite these caveats, we think that analysing at the individual level the wealth of ARA, DHA and THg data that has already been obtained through earlier nutrition or food security studies would enhance our understanding of trophic structures.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Indicators - Volume 81, October 2017, Pages 315-324
نویسندگان
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