An investigation on macro benthic fauna of Southwestern of Anzali Lagoon and the relation of organic material to macro invertebrates
Message:
Abstract:
Macrobenthic assemblages of the Anzali lagoon were studied in order to investigate their population density, distribution and abundance. Anzali lagoon with an area of 200 km² is situated in the south-west of the Caspian Sea. Samples were obtained in 4 stations seasonally and taken with a 250 Cm² Van Veen grab in Anzali lagoon from spring 2006 to winter 2006 with 3 replicates. Environmental factors such as temperature, grain size, T.O.M, salinity, pH and dissolved oxygen were also studied. 36 taxa were identified to species or lowest taxonomic level. The most abundant recorded species were Chironomus, Scirtes tibiolis, Ambrysus mormon of insecta, and Tubifex of Oligochaeta, which present in samples through the study area. However Valvata cristata of Gastropoda was observed only in summer. According to the results, the Shannon-wiener index fluctuated between lowest up to 2.64. Abundance and diversity of macroinvertebrates were maximum in spring and autumn. In spring it can be related to spawning and recruitment of the macrobenthos in Siah Keshim Wetland. In autumn however, greater amount of invertebrates in the environment can be as a result of reduction in water temperature which diminishes the feeding rate of predatory fishes. Summer and winter benthic invertebrates of Siah Kashim were lower in number and diversity. Most fishes of Anzali Lagoon are benthic feeders, so in summer when water temperature rises, they become more active in feeding macrobenthos. As a result their frequency and diversity reduces in summer. Winter in Siah Kashim coincides with death of many macrophytes, which provide space for aggregation of insect larvae as benthic animals. This may cause a reduction in benthos of Siah Kashim in winter.
Language:
Persian
Published:
Journal of Oceanography, Volume:1 Issue: 4, 2011
Page:
11
magiran.com/p927315  
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یک‌ساله به مبلغ 990,000ريال می‌توانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
  • حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران می‌شود.
  • پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانه‌های چاپی و دیجیتال را به کاربر نمی‌دهد.
دسترسی سراسری کاربران دانشگاه پیام نور!
اعضای هیئت علمی و دانشجویان دانشگاه پیام نور در سراسر کشور، در صورت ثبت نام با ایمیل دانشگاهی، تا پایان فروردین ماه 1403 به مقالات سایت دسترسی خواهند داشت!
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 50 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!