کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5764534 1626065 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Trophic diversity, size and biomass spectrum of Bay of Bengal nematodes: A study case on depth and latitudinal patterns
ترجمه فارسی عنوان
تنوع طوفان، اندازه و طیف زیست توده نماتدای خلیج بنگال: مورد مطالعه در عمق و عرض
کلمات کلیدی
نماتدها، تنوع طلا، طیف اندازه و زیست توده، فلات قاره، خلیج بنگال، هند،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی


- Nematode distribution and diversity showed decrease with increasing depth.
- Trophic status of nematodes visualizes the depth and latitude specific patterns but not in ITD.
- Different peaks of nematode size spectra displayed an availability of variety of food resources.
- Nematode community structure along with size spectra influencing the biomass concentration.

Depth and latitudinal patterns of nematode functional attributes were investigated from 35 stations of Bay of Bengal (BoB) continental shelf. We aim to address whether depth and latitudinal variations can modify nematode community structure and their functional attributes (trophic diversity, size and biomass spectra). Global trend of depth and latitudinal related variations have also been noticed from BoB shelf in terms of nematode abundance and species richness, albeit heterogeneity patterns were encountered in functional attributes. Index of trophic diversity values revealed higher trophic diversity across the BoB shelf and suggested variety of food resource availability. However, downstream analysis of trophic status showed depth and latitude specific patterns but not reflected in terms of size and biomass spectrum. The peaks at different positions clearly visualized heterogeneity in distribution patterns for both size and biomass spectrum and also there was evidence of availability of diversified food resources. Nematode biomass spectra (NBS) constructed for nematode communities showed shift in peak biomass values towards lower to moderate size classes particularly in shallower depth but did not get reflected in latitudes. However, Chennai and Parangipettai transects demonstrated shift in peak biomass values towards higher biomass classes explaining the representation of higher nematode abundance. Our findings concluded that depth and latitudes are physical variables; they may not directly affect nematode community structure and functional attributes but they might influence the other factors such as food availability, sediment deposition and settlement rate. Our observations suggest that the local factors (seasonal character) of phytodetrital food flux can be very important for shaping the nematode community structure and success of nematode functional heterogeneity patterns across the Bay of Bengal shelf.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Continental Shelf Research - Volume 148, 15 September 2017, Pages 139-149
نویسندگان
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