کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4528810 1324333 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
δ15N and δ13C analysis of a Posidonia sinuosa seagrass bed
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
پیش نمایش صفحه اول مقاله
δ15N and δ13C analysis of a Posidonia sinuosa seagrass bed
چکیده انگلیسی

Potential food sources and dominant invertebrates and fishes were collected for the examination of variability in 13C/12C and 15N/14N to determine the sources of carbon available to consumers within a Western Australian Posidonia sinuosa-dominated seagrass bed. Autotrophs showed a wide distribution of δ13C values, with P. sinuosa at −11.3 ± 0.8‰ and macroalgae ranging from −16.6 to −31.7‰. This variation allowed us to successfully identify macroalgae as the main contributor of carbon to the trophic structure, although no distinction could be made between epiphytic macroalgae on seagrass, or allochthonous macroalgal sources. The range in δ15N ratios among potential food items at the trophic base was too small to make it useful as tracer of nitrogen flow pathways, but it consistently increased from macrophytes and detritus (4.1–6.8‰), to invertebrates (5.7–7.4‰) located near the middle of the food web, to fishes (8.3–11.9‰), with piscivorous species such as Leviprora inops generally having a higher 15N. δ13C of seston (−12.8‰) and sedimentary organic matter (−8.7‰) indicate that seagrass material is the main contributor to these two carbon pools, and that very little of it contributes to animal biomass.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquatic Botany - Volume 84, Issue 3, April 2006, Pages 277–282
نویسندگان
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