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Nephtydae (2%). Among the 20 sedentarians families Cirratulidae contributed maximum (19.7%) to the total density followed by Spionidae (15.2%), Capitellidae (7.2%), Ampharetidae (8.3%), Cossuridae (5%) and Terebellidae (3.6%). Of the total 133 polychaete species encountered, errantia was represented by 43 species and sedentaria by 90 species. Depth wise occurrence of different polychaetes species is presented in Table 20. At 30 m depth zone, 52 species were present of which 12 species were of errant type and 40 were sedentarian. Of the 52 species, 6 species were considered as 'abundant' (Ancystrosillis constricta, Lumbrineries hartmani, Prionospio pinnata, P. po(vbranchiata, Cossura coasta and Capitella capitata) and 21 species were 'moderately abundant' among which Nephtys dibranchis, Prionospio cirrobranchia, P. cirrifera, Magelona cincta, Ciriformia ajer, Heteromastus bifidis, Notomastus fauvelli, Schyphoproctus sp. and Sternaspis scutata were the major ones (present> 50% of the stations). The remaining 25 species can be considered as 'rare'. In this zone, species which contributed more to the total density were Cossura coasta (730/m2), Prionospio pinnata (600/m2), P. polybranchiata (530/m2), and Sternaspis scutata (490/m2) At 50 m zone, 58 species were obtained of which 18 species were errant forms and 40 were sedentarians. Of the 58 species, 8 were 'abundant' (Ancistrosyllis constricta, Nephtys dibranchis, Lumbrineries aberrans, Prinospio pinnata, P. polybranchiata" Cossura coasta, Capitella capitata and Sternaspis scutata) and 50 were 'moderately abundant' of which Glycera longipinnis, Lumbrineries hartmani. Prinospio cirrobranchiataa, P. cirrifera, Magelona cincta, Cirratulis cirratus, Cirriformia afer, Paraonides lyra lyra , Aricidea fauveli, Notomastus abberans, Paraheteromastus tenuis, Amphictius gunneri, and Etione sp. were the major ones and no species could be considered as 'rare'. In this depth zone Ancistrosyllis 135
constricta (920/m2), Prionospio pinnata (820/m2), Cirratulis aler (J8l0/m2) were the dominant species. At 75 m zone a total of 72 specIes were present, among which errantia constituted 26 species and sedentaria 46 species. Of the 72 species, 10 species were considered as 'abundant' which included Ancistrosyllis constricta, Prionospio pinna ta, P. cirrobranchia, P. cirri/era, Magelona cincta, Cirratulis cirratus, Cirriformia aler, Cossura coasta, Maldane sarsi, and Amphicteis gunneri. In the 'moderately abundant' group, 18 species were noticed of which Nephtys dibranchis, Gonioda emerita, Lumbrineries hartmani, Prinospio polybranchiata and Capitella capitata were the major ones. The 'rare' ones included 44 species. In this zone Cirratulis cirratus (l710/m2) and C. chrysoderma (l280/m2) were the dominant specIes. At 100 m zone, a total of 66 species were recorded, errantia constituted by 24 species and sedentaria represented by 42 species. Of the total 66 species, 9 species were regarded as 'abundant' which included Ancistrosyllis constricta, Prionospio pinnata, P. cirrifera, Magelona cincta, Cirratulus cirratus, Tharyx sp., Capitella capitata, Notomastus aberans, and Amphicteis gunneri. Nine species were 'moderately abundant' (Nephtys dibranchis, Prionospio cirrobranchiata, Cirriformia a/er, Cossura coasta, Syllis spongicola, Lumbriconeries aberrans, L. hartmani, Heteromastides bifidus and Maldane sarsi), and as many as 48 species were found to be 'rare'. Species such as Notomastus aberrans (J 1 lO/m2), Cirratulus cirratus (BOO/m2), Prinospio pinnata (560/m2) and Ancistrocyllis constricta (660/m2) contributed more to the total density. At 150 m depth zone, only two stations could be sampled and 39 species were present of which 12 belonged to errantia and 27 to sedentaria. Of the 39 species encountered in this zone, only one species, Cossura coasta was considered as ilb
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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
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Hashimi, N. H., Kidwai, R. M., Nair
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Postma, H., 1967. In Estuaries, Lau
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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 136 and 137: Wagh, 1975; Parulekar et ai, 1976;
Page 138 and 139: ones and 17 were included in the 'r
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
Page 186: 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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