کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8886089 | 1627435 | 2018 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phytoplankton and protozooplankton on the southern Patagonian shelf (Argentina, 47°-55°S) in late summer: Potentially toxic species and community assemblage structure linked to environmental features
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
اقیانوس شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
On the southern Patagonian shelf (Argentina, 47°-55°S) phyto- and protozooplankton are key structural and functional components of a complex trophic web that sustains commercially important species. During late summer 2004, spatial structure, assemblage species and their association with environmental characteristics of water masses were studied for the 2-200â¯Î¼m phyto- and protozooplankton communities. Ultraplankton 2-5â¯Î¼m was the most abundant size-fraction (90%), followed by the lower nanoplankton 5-10â¯Î¼m (7.5%), the larger nanoplankton 10-20â¯Î¼m (1.5%), and microplankton 20-200â¯Î¼m (1%). Several of the 319 morpho-species found are potentially toxic taxa (the dinoflagellates Alexandrium tamarense, Protoceratium reticulatum, Dinophysis acuminata, Prorocentrum cordatum, Karenia and amphidomataceans and the diatom genus Pseudo-nitzschia), and this is important since the area sustains significant fisheries. A ultraphytoeukaryotic coccal cell (probably chlorophyte/prasinophyte) (3â¯Î¼m), P. cordatum, and a microplankton naked ciliate were the morpho-species with the highest abundance and occurrence. Abundance and biodiversity patterns indicated that the plankton community structure was heterogeneous vertically, cross-shelf, and along-shelf, suggesting shifts in community structure over the region. Five areas with dissimilar plankton assemblages were defined, each corresponding to different environments. Depth, bathymetry, latitude and temperature were the most explanatory variables for the assemblage distribution patterns observed. This south Patagonian region possesses important fisheries and, considering expected environmental changes, our results help to understand the spatial structure of plankton communities over a broad size spectrum.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Sea Research - Volume 140, October 2018, Pages 63-80
Journal: Journal of Sea Research - Volume 140, October 2018, Pages 63-80
نویسندگان
Julieta C. Antacli, Ricardo I. Silva, Andrés J. Jaureguizar, Daniel R. Hernández, Manuela Mendiolar, Marina E. Sabatini, Rut Akselman,