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Studies on the prevalence of algal blooms along Kerala coast, India

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Relation http://eprints.cmfri.org.in/7603/
 
Title Studies on the prevalence of algal blooms
along Kerala coast, India
 
Creator Jugnu, R
 
Subject Theses
Algal Blooms
 
Description 61 species of marine phytoplankton belonging to 32 genera were recorded from Chombala in north
Kerala during the period from October 2001 to September 2002 (first year) and 76 species of 33
genera during the period from October 2002 to September 2003 (second year). From Vizhinjam,
along south Kerala, 91 species of 30 genera and 90 species of35 genera were recorded in the sea
in the first and second years respectively whereas in the adjacent bay 88 and 95 species belonging
to 28 genera were recorded.
2. Diatoms and dinoflagellates, the two most diverse phytoplankton groups were rich in species diversity
and density at both the sites, with the diatom species contributing the maximum to phytoplankton
community structure. Blue green algae, mainly Trichodesmium sp was recorded from Chombala
(12.5%) and Vizhinjam bay (8.3%) but was more frequent (25%) from Vizhinjam sea. A
rapidophyte Chat/onella marina was recorded only from Chombala. Diatoms formed 83.5 % of
the community at Chombala, while at Vizhinjam they formed 70.9"10, the reduction in
contribution mainly due to the dominance of dinoflagellates; the diversity being controlled by the
two genera Ceratium and Peridinium.
3. The annual average phytoplankton diversity index at Chombala was 1.88, of which the diversity of
diatom and dinoflagellate were 1.81 and 0.29 respectively.
4. The diatom community at Chombala consisted of 10 families, of which members of the families
Coscinodiscaceae (32.7%), Fragilaroideae(19.3%) and Biddulphiae (16.4%) were dominant
Among the 7 families of dinoflagellates recorded at Chombala, Gymoodinaceae (24.3%),
Peridinaceae (13.3%) and Ceratiaceae (13%) dominated the phytoplankton community structure.
5. The annual average phytoplankton diversity at Vizhinjam bay and sea were 2.13 and 2.09 respectively,
of which the diversity indices of diatom and dinoflagellate in the sea were 1.85 and 1.15 and in
the bay 1.5 and 0.98 respectively.
6. The diatom community at Vizhinjam sea consisted of 9 families of which members of Chaetocerae
(28.4%), Fragilaroideap. (19"10), Biddulphiae (16.8%) and Coscinodiscacea (16.6%) were
dominant. Among dinoflagellates, the families Dinophysiaceae (26.3%), Ceratiaceae (23.7%),
Peridinaceae (36.1 %) dominated the phytoplankton community structure. At Vizbinjam bay, of
the 9 families, members of Chaetocerae (21.6%), Fragilaroideat.(21.2%), Biddulphiae (17.3%)
and Coscinodiscaceae. (16.3%) were dominant and among dinoflagellates, the families
Peridinaceae (37.1 %), Dinophysiaceae (35.4%), Ceratiaceae (17 .9"10), dominated the
phytoplankton community structure.
7. In the family Dinophysiaceae, the family in which DSP toxicity is shown by most of its members, two
species were common Prorocellhlm micans was present in 6 and Dillophysis caudata in 15 out of
the 24 sampled months at Vizhinjam.
 
Date 2006
 
Type Thesis
NonPeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/7603/1/TH-148.pdf
Jugnu, R (2006) Studies on the prevalence of algal blooms along Kerala coast, India. ["eprint_fieldopt_thesis_type_phd" not defined] thesis, Cochin University of Science and Technology, Cochin.