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Title: Changes in mesozooplankton community structure during Trichodesmium erythraeum bloom in the coastal waters of southwestern Bay of Bengal
Authors: Sahu, Gouri
Mohanty, A. K.
Achary, M. Smita
Sarkar, S. K.
Satpathy, K. K.
Keywords: Mesozooplankton;Community structure;Trichodesmium erythraeum;Algal bloom;Bay of Bengal;Southeast coast of India
Issue Date: Sep-2015
Publisher: NISCAIR-CSIR, India
Abstract: Present study addresses variability in mesozooplankton community structure (size ranges from 0.2-20 mm) during the appearance of diazotrophic marine cyanobacterium Trichodesmium erythraeum bloom in the coastal waters southeastern part of India. Zooplankton density (individuals per 10 m3) was the maximum during pre-bloom period (5.5 x 105) followed by bloom (4.9 x 105) and post-bloom period (4.3 x 105). Copepods contributed ~ 64 % of the zooplankton abundance during pre-bloom period in which calanoids were dominant (41%). Carnivore copepods (25%) (Cyclopoids and Poicilostomatoids) dominated over herbivore (23%) (Paracalanidae) during the peak bloom. Non-copepod holoplankters and meroplankters were dominant during pre-bloom period. The cladoceran, Evadne tergestina (35% of total non-copepod crustacean holoplankton) was found to be the most important species during bloom period. Among the meroplankters, cirripede nauplii (59% of the total meroplankton) were dominant form during bloom period. Co-occurrence of Trichodesmium bloom with high abundance of Penilia avirostris & Evadne tergestina and association of Acartia spinicauda and Oithona spp., in large numbers during bloom were the interesting features of this study.
Page(s): 1282-1293
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.44(09) [September 2015]

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