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Wagh, 1975; Parulekar et ai, 1976; Ansari et ai, 1977; Harkantra and Parulekar, 1981; Devassy et ai, 1987; Varshney et ai, 1988; Vizakat et ai, 1991; Harkantra and Parulekar, 1991 & 1994; Prabhu et ai, 1993; Gopalakrishnan and Nair, 1998 and Ingole et ai, 2002). Parulekar et al (1982), Ansari et al (1996) have attempted to study the benthos from the deeper depths of Indian EEZ. Later, Joydas (2002) and Sajan (2003) worked on the macro and meiobenthos from the west cost of India respectively. 6.2. Results Depth wise and transect wise variations m the faunal composition of northwestern continental shelf of India are examined and discussed in this chapter. The description is presented in three parts. The first part deals with results of faunal composition during post-monsoon and pre- monsoon periods. Second part describes the community structure analysis of polychaetes and all groups including polychaetes. Third part of the result deals with the similarity indices for both the seasons. Based on their occurrence benthic organIsms were differentiated into 3 catregories such as 'abundant', 'moderately abundant' and 'rare'. The 'abundant' are those organisms present in more than 75% of the total stations sampled in each depth zone and 'moderately abundant' are those occurred in 25-75% of the stations and the remaining is considered as 'rare'. 6.2.1. Faunal composition 6.2.1.1. Post-monsoon Fauna composed of polychaetes, crustaceans, molluscs and miscellaneous groups (Plates 5-8). Percentage contribution of each group is given in Fig. 35. Polychaetes constituted 86% followed by molluscs (9%) and crustaceans (4%). Miscellaneous groups formed only 1 % to the total population. Other than 131
polychaetes, crustaceans contributed substantially along most transects except ofT Mumbai and Porbander where molluscs dominated. Percentage contribution of various polychaete families is presented in Table 16. Polychaetes were composed of errantia (6%) belonging to 10 families and sedentaria (94%) belongigng to 14 families. Eunicidae (2.8%) and Pilagidae (1.2%) were the major families in Errantia. Other important families among errantia were Nephtydae (0.58%), Aphrodite (0.53%), Glyceridae (0.41 %) and Pisionidae (0.27%). Among 14 sedentarian families, Spionidae was the dominant one (64.2%) followed by Magelonidae (10.3%), Cirratilidae (5.1 %), Cossuridae (5%), Capitellidae (3.6%), Paraonida (2.2%) and Stemaspidae (1.2%). Of the 76 species present during post monsoon, 25 species belonged to errantia and 51 species to sedentaria. Depth wise percentage occurrence of polychaete species is presented in Table 17. At 30 m depth zone, 37 species were present of which 8 species were coming under errantia and 29 under sedentaria. Of the 37 species, 6 species were considered as 'abundant' (Prinospio pinnata, P. polybranchiata, Magelona capensis, Cirratulis cirra/us, Cossura coasta and Capitella capitata) and 12 were 'moderately abundant' of which Ancystrosyllis constricta, Lumbrineries aberans, Prinospio cirri/era, Magelona cincta and Heteromastus bifidis were the major ones (i.e., present in more than 50% of the stations). The remaining 19 species were considered as 'rare'. Species contributed more to the total density were Cossura coasta (6100/m 2 ), Magelona cincta (5800/m 2 ), and Prinospio cirri/era (5400/m 2 ). At 50 m zone altogether 34 species were present, composed of II errantia and 23 sedentaria. Among these, 7 were regarded as 'abundant' (Ancystrosyllis cons/rieta, Prinospio pinnata, P. polybranchiata, P. cirri/era, Cirratulis cirratlls, Cossura coasta and Capitella capitata) and 10 species were treated as 'moderately abundant' of which Lumbrineries aberrans, L. hartmani, Prinospio ehlersi, Magelona capensis, Paraheteromastus tenuis and Sternaspis scutata were the major 132
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Certificate I hereby certify that t
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Contents Page No. Chapter 1. Introd
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the bottom. Ekman (1935) described
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wonns are the most abundant group a
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leadership of Sir James Clark Ross,
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Ansari et al., (1977b) carried out
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Gopalakrishnan and Nair (1998) cond
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Major objectives:- 1. To understand
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CMFRI (Central Marine Fisheries Res
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Joydas, T.V., Damodaran, R., 2001.
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monitoring committee (Atlantic Mari
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Vizakat Lathika, I-Iarkantra, S. N.
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analysed after acidification by tit
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used as stain prior to sorting and
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space. Therefore, it is very essent
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Fig. I - Station locations 32
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affected at high temperature. Most
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layers exhibit different oceanograp
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Transect wise variation in temperat
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3.2.2.3. Dissolved oxygen (DO) Dist
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monsoon temperature initially incre
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opined that limited mixing. high or
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Naqvi, S. W. A., Noronha, R. J., Re
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orr Mormugao orr Vernal 35.36 35.32
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The continental shelf and its adjoi
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sediments (4 stations). Silty sand
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fine sediments with comparatively h
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Narayana, 1991 ). Limited input of
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In general. two ditlerent patterns
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et al., (1980) reported values in t
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organisms living in the water and t
Page 79 and 80: Hashimi, N. H., Kidwai, R. M., Nair
Page 81 and 82: Postma, H., 1967. In Estuaries, Lau
Page 85: Depths Sand Silt Clay Organic matte
Page 90: • PRE'MONSOON SOUTHERN'TRANSECTS
Page 96 and 97: as the best indicators of the envir
Page 99 and 100: showed that northern transects have
Page 101 and 102: decreased from shallow to deeper de
Page 103: different depth zones showed that a
Page 106 and 107: cm 2 with a dominance of nematodes.
Page 108 and 109: and 6.08 g/m 2 were recorded during
Page 110 and 111: were located in the nearshore water
Page 112 and 113: changes in the hydrographical and t
Page 114 and 115: factor for such a large difference
Page 116 and 117: Belegvad, H., 1932. Investigations
Page 118 and 119: Parulekar, A. H., Harkantra, S. N.,
Page 120: Savich, M. S., 1972. Quantitative d
Page 123 and 124: Traosects Polychaetes Crustaceans M
Page 125: Miscellaneous Transects Nematodes C
Page 128 and 129: Depths Nematodes Cope pods Foramini
Page 138 and 139: ones and 17 were included in the 'r
Page 140 and 141: Nephtydae (2%). Among the 20 sedent
Page 143 and 144: At 75 m zone, 31 groups/species wer
Page 145 and 146: Porbandar. At 50 m depth zone, fluc
Page 148 and 149: otTMumbai and Ratnagiri and low eve
Page 150 and 151: species richness at each depth zone
Page 153 and 154: E2.2.2.!. Richness (Margalef's inde
Page 155: I ):.2.2.2.4. Dominance (Pie/ou's i
Page 172 and 173: Tablc 17. Contd .. - Sternaspidae 0
Page 176: Table 20. contd .. G. alba 20 25 20
Page 179: 150 Taxa 30m 50m 75m lOOm 150 m m D
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9% 1% o poIychaete • crustacea o
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a) c) e) g) Plate 5 a) Prinospio sp
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a) c) e) Plate 7 a) Cardium sp. d)
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7/. /ntroduct ion 7.2. Hydrography
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also showed a similar pattern with
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y most of the organisms. It was als
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with sand of which total density (r
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muddy bottom of the west coast of I
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crustaceans and miscellaneous group
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the organic rich environment with h
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Icvci (p
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mcioHmna serve primarily as rapid m
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surface chlorophyll a was 0.36mg I
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Devassy, V. P., Achuthankutty, C. T
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Longhrust, A. R., Pauly, D., 1987.
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Sikora, W. B., 1977. The ecology of
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Faunal groups Silty Clayey Mixed Sa
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Mannagoa to Porbandar located betwe
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against gastropods during pre- mons
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