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| Diversity of Benthic Invertebrates Fauna and Secondary Production in Southern Caspian Sea Basin, Case Study on Tajan River Estuary |
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A. Javanshir,
M. Shapoori and S. Jamili |
Abstract:
Macro benthic invertebrate assemblages were investigated
monthly, from March 2006 to March 2007, at six stations in Tajan river
estuary, a south eastern Caspian Sea coastal estuary, in order to estimate
secondary production consumable for extensive finger fish releasing and
to investigate the factors affecting this production. Benthic assemblages
comprised 9 taxa, of which Ballanus sp., Chironomus plumosus
and Cerastoderma lamarki were the main contributors to both overall
biomass and secondary production. Annual secondary production varied from
4.55 g AFDW m-2 year-1 (Ash Free Dry Weight), in
the upper Tajan estuary, to 78.06 g AFDW m-2 year-1
(Ash Free Dry Weight) in the center of the estuary area. Multivariate
correlations between environmental variables and the Macro benthic assemblage
biomass highlighted the role of the water level, temperature, sediment
organic carbon content and dissolved oxygen in the differentiation of
the communities in the estuary. Composition, biomass and secondary annual
production of Macro benthic communities were dramatically affected by
changes in water residence time and summer drought crises. The isolation
of this habitat limits the recovery of other invertebrate benthic assemblages
during drought periods. Only populations of two species, Balanus sp.
and C. plumosus, seemed to be able to recover quickly after the
drought crises, which, in turn, could compromise the overall secondary
production, with negative effects on the released fish survival. During
summer water renewal, when agricultural activity is intense and nutrient
inputs should be regulated in this estuary to reduce the risk of benthic
mass mortality and to ensure a sustainability of this environment.
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How to cite this article:
A. Javanshir, M. Shapoori and S. Jamili, 2008. Diversity of Benthic Invertebrates Fauna and Secondary Production in Southern Caspian Sea Basin, Case Study on Tajan River Estuary. Journal of Fisheries and Aquatic Science, 3: 353-365.
DOI: 10.3923/jfas.2008.353.365
URL: https://scialert.net/abstract/?doi=jfas.2008.353.365
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