Zakir Ansari - Academia.edu (original) (raw)

Papers by Zakir Ansari

Research paper thumbnail of Status of Coastal Marine Biodiversity of Goa and Challenges for Sustainable Management - An Overview

Journal of Ecophysiology and Occupational Health, 2020

Degradation of marine and coastal ecosystem can be seen everywhere and Goa is no exception. Biodi... more Degradation of marine and coastal ecosystem can be seen everywhere and Goa is no exception. Biodiversity provide important services to mankind and needs to be protected. Goa is endowed with varied microhabitats along its 105 long coast line. These habitats are home to diverse forms of life about which little is known. The coastal waters serve as nursery to fishes and other animals which are exploited commercially. The present communication reviews the current status on the taxonomic knowledge of the coastal biodiversity of Goa. The coastal water of Goa abound in flora and fauna. The information on major fauna and flora of Goa is sufficiently available. There is, however, some lacunae in our knowledge on invertebrate subgroups, such as sponges, octocorals, ctenophores, and tunicates and minor phyla. The biodiversity of specialized ecosystems continued to be inadequately known and remains a challenge to specialists from Goa coast. Threat to coastal and marine biodiversity due to climate change and environmental degradation are intensifying with time. The anthropogenic activities are causing damage to pristine coastal ecosystems. The loss of biodiversity will be felt in greater strength by future generation. The present knowledge on coastal biodiversity warrants continued taxonomic research in the least-studied or unknown groups of hot spot areas in the light of existing threats to marine biodiversity. It is suggested that further research on new species occurrences in the least studied groups should be continued to update the data and improve our knowledge. The appropriate measures will be required to protect the rich biodiversity resources of Goa.

Research paper thumbnail of Seasonal variations and relationships between environmental parameters and heavy metal concentrations in tissues of Crassostrea species and in its ambience from the tropical estuaries

Environmental science and pollution research international, Jan 15, 2018

This study aimed to evaluate the relationship between physicochemical parameters and heavy metal ... more This study aimed to evaluate the relationship between physicochemical parameters and heavy metal (Cu, Ni, Pb, and Cd) concentrations from sediment, seawater, and its accumulation in tissues of oyster species (Crassostrea madrasensis and C. gryphoides) from the three sites (Chicalim Bay (CB), Nerul Creek (NC), Chapora Bay (ChB)) along the Goa coast (India). Results showed enrichment of Cu and Ni in sediment exceeding the effect range low (ERL) level. The higher concentrations of Cu and Ni in sediments and in suspended particulate matter (SPM) from all the study sites are indicative of severe contamination of estuarine and associated habitats. Moreover, particulate Ni (at all the sites), Cu (at NC and ChB), Pb (at NC), and Cd (at CB and NC) concentrations were recorded more than its total loadings in surface sediment. Concentration of Cu and Cd in oyster tissue was several folds higher than its concentration in ambience. Further, this study showed that the levels of metal in oysters a...

Research paper thumbnail of Effect of an oil spill from M V Sea Transporter on intertidal meiofauna at Goa, India

Marine Pollution Bulletin, 2002

Short and long term effects of a fuel oil spill from a grounded ship ''M V Sea Transporter'' on m... more Short and long term effects of a fuel oil spill from a grounded ship ''M V Sea Transporter'' on meiofauna of a sandy beach of central West Coast of India were investigated. A significant reduction in the absolute abundance of meiofauna was observed immediately after 3 days of spillage particularly at Sinquerim beach, the site of spillage. The reduction was most pronounced in density of nematodes and harpacticoid copepods, which were the most dominant groups. Long-term response showed no apparent oilinduced changes at major taxa levels. The population density improved considerably after the cessation of monsoons with a parallel decrease in petroleum hydrocarbon concentration in the sediment. Nematodes recovered more quickly than benthic copepods. No evidence for this could be due to reproductive dynamics in meiobentos. Although the effect of the oil on meiofauna could be seen initially it could not be proved conclusively on a long-term basis. The effects of the oil spill were confounded with seasonal monsoon effects and beach dynamics. The nematode:copepod ratio and the index of trophic diversity (ITD) were inadequate for detecting oil pollution effects. Therefore it may be concluded that in the presence of other environmental factors acting strongly, the effects of oil on meiofauna was strong but of a temporary nature.

Research paper thumbnail of Distribution, abundance and diversity of phytoplankton in the inshore waters of Nizampatnam, South East coast of India

Indian Journal of Geo-Marine Sciences

Distribution, abundance and species assemblages of Phytoplankton were studied from inshore waters... more Distribution, abundance and species assemblages of Phytoplankton were studied from inshore waters of Nizampatnam, South East coast of India in March 2007. Significant spatial variations in temperature, pH, salinity, dissolved oxygen (DO), nitrites (NO 2) –N), nitrates (NO 3) – N), phosphate (PO 4) –P), silicate (SiO 4) – (Si) were monitored. A total of 90 species of phytoplankton (net hauls) represented by 5 groups were identified at nine stations, collected along three transects during low tide. Percentage contribution of each group of phytoplankton was in the order: Bacillariophyceans > Dinophyceans > Cyanophyceans > Euglenophyceans. Pleurosigma angulatum, Navicula sp. were dominant species in the study area. Bray -Curtis similarity and group average clustering, recommended identifying two assemblages of phytoplankton in the study area. High diversity of phytoplankton in the present area suggests stable environmental conditions. Introduction Phytoplankton is one of the bi...

Research paper thumbnail of Studies on the reproductive biology of Indian Sand Whiting Sillago sihama (Forsskal)

Sillago sihama have a prolonged breeding season from June to December, with spawning activity pea... more Sillago sihama have a prolonged breeding season from June to December, with spawning activity peaked during the period of September to November. Length at first maturity stage was found to vary between 155-164 mm (total length) in both sexes. Although overall sex ratio indicated predominance of female, Chi-square test ( x 2 ) showed no significant difference throughout the year. Fecundity varied from 11,376 to 103,695 per fish, is significantly correlated with total length (r = 0.85, ρ < 0.01), body weight (r = 0.88, ρ < 0.01) and ovary weight (r = 0.87, ρ < 0.01). (Keywords : Sillago sihama, Reproduction, Spawning, Fecundity, Sex ratio )

Research paper thumbnail of Macrobenthic Communities of the Coastal Waters of Dabhol, West Coast of India

Indian Journal of Marine Sciences, 2002

Indian Journal of Marine Sciences Vol. 31(2), June 2002, pp. 93-99 ... Macrobenthic communities o... more Indian Journal of Marine Sciences Vol. 31(2), June 2002, pp. 93-99 ... Macrobenthic communities of the coastal waters of Dabhol, west coast of India ... Baban Ingole∗, Nimi Rodrigues & Zakir Ali Ansari ... Biological Oceanography Division, National Institute of Oceanography, Dona ...

Research paper thumbnail of Total petroleum hydrocarbon in the tissue of some commercially important fishes of Bay of Bengal

The present study reports the level of total petroleum hydrocarbon (TPH) in 27 commercially impor... more The present study reports the level of total petroleum hydrocarbon (TPH) in 27 commercially important fish, crustaceans and cephalopods from Orissa coast, Bay of Bengal to provide the baseline data for oil contamination in marine biota. The results showed significant differences in the TPH concentration in different species. Of all fish, Carangoides malabaricus showed the maximum TPH level (av. 13.70 µg g-1). In cephalopods, Loligo recorded the maximum TPH (av. 14.87 µg g-1) while Metapenaeus dobsoni recorded the maximum TPH (av. 13.18 µg g-1) among crustaceans. The concentration of TPH recorded in the present study were higher than the reported values from other studies in Bay of Bengal but were comparable with those of other Indian coast and Gulf water. The species recording maximum concentration and giving significant correlation coefficient may be of interest in oil pollution monitoring and can be used as indicator of hydrocarbon pollution in the region.

Research paper thumbnail of Total petroleum hydrocarbon in the tissues of some commercially important fishes of the Bay of Bengal

Marine Pollution Bulletin, 2012

The present study reports the level of total petroleum hydrocarbon (TPH) in 27 commercially impor... more The present study reports the level of total petroleum hydrocarbon (TPH) in 27 commercially important fish, crustaceans and cephalopods from Orissa coast, Bay of Bengal to provide the baseline data for oil contamination in marine biota. The results showed significant differences in the TPH concentration in different species. Of all fish, Carangoides malabaricus showed the maximum TPH level (av. 13.70 µg g-1). In cephalopods, Loligo recorded the maximum TPH (av. 14.87 µg g-1) while Metapenaeus dobsoni recorded the maximum TPH (av. 13.18 µg g-1) among crustaceans. The concentration of TPH recorded in the present study were higher than the reported values from other studies in Bay of Bengal but were comparable with those of other Indian coast and Gulf water. The species recording maximum concentration and giving significant correlation coefficient may be of interest in oil pollution monitoring and can be used as indicator of hydrocarbon pollution in the region.

Research paper thumbnail of Fig. 1 in Description of a New Mangrove Root Dwelling Species of Teleotanais (Crustacea: Peracarida: Tanaidacea) from India, with a Key to Teleotanaidae

Fig. 1. Teleotanais indiaensis sp. nov. A, holotype, habitus, lateral view; B, paratype, habitus,... more Fig. 1. Teleotanais indiaensis sp. nov. A, holotype, habitus, lateral view; B, paratype, habitus, dorsal view; C, antennule; D, antenna; E, labrum, lateral view. Scale bars: 1.0 mm for A–B, 0.25 mm for C–D, 0.1 mm for E.

Research paper thumbnail of Fig. 3 in Description of a New Mangrove Root Dwelling Species of Teleotanais (Crustacea: Peracarida: Tanaidacea) from India, with a Key to Teleotanaidae

Fig. 3. Teleotanais indiaensis sp. nov. paratype. A, cheliped; B, pereopod 1; C, pereopod 2; D, p... more Fig. 3. Teleotanais indiaensis sp. nov. paratype. A, cheliped; B, pereopod 1; C, pereopod 2; D, pereopod 3; E, pereopod 4; F, pereopod 5; G, pereopod 6. Scale bars: 0.25 mm for A, 0.1 mm for B–G.

Research paper thumbnail of Fig. 2 in Description of a New Mangrove Root Dwelling Species of Teleotanais (Crustacea: Peracarida: Tanaidacea) from India, with a Key to Teleotanaidae

Fig. 2. Teleotanais indiaensis sp. nov. paratype. A, left mandible; B, right mandible; C, labium;... more Fig. 2. Teleotanais indiaensis sp. nov. paratype. A, left mandible; B, right mandible; C, labium; D, maxillule, endite; E, same, palp; F, maxilliped; G, epignath; H, pleopod; I, uropod. Scale bars 0.1 mm.

Research paper thumbnail of Teleotanais Lang 1956

Genus <i>Teleotanais</i> Lang, 1956 <b>Revised diagnosis.</b> Female. Wit... more Genus <i>Teleotanais</i> Lang, 1956 <b>Revised diagnosis.</b> Female. With mottled dorsal pigmentation. Eye lobes and pigmented eyes present. First four pleonites each bearing pair of articulated, plumose midlateral setae, last pleonite bearing pair of simple midlateral setae. Antenna articles 2 and 3 without dorsodistal spiniform setae, article 3 with proximal, medial, and distal dorsal setae. Maxillule with palp bearing one or two distal setae. Maxillipedal endite not expanded, distally armed with single seta and two or three fine, pointed spine. Fixed finger of cheliped with raised inner ridge. Carpus of pereopods 2–3 without spiniform setae. Posterior pereopods with distal spiniform seta on merus, carpus, and propodus; dactylus plus unguis claw-shaped but these elements unfused. Basal articles of pleopods with single dorsal plumose seta. Uropods shorter than pleotelson; exopod with two articles, endopod with one or two articles. We believe that the presen...

Research paper thumbnail of Teleotanais Lang 1956

Key to the genus <i>Teleotanais</i> 1. Maxillipedal endites with two pointed spinifor... more Key to the genus <i>Teleotanais</i> 1. Maxillipedal endites with two pointed spiniform setae. Uropodal endopod uniarticulate. Pleopodal endopod with two inner setae.............. <i>T. warragamba</i> (Australia) – Maxillipedal endites with three pointed spiniform setae. Pleopodal endopod with one inner seta. Uropodal endopod biarticulate................................................... 2 2. Cephalothorax shorter than pereonites 1–3 combined. Cheliped fixed finger with two ventral, one ventro-subdistal, and four inner setae............... <i>T. indiaensis</i> (India) – Cephalothorax as long as pereonites 1–3 combined. Cheliped fixed finger with one ventral, one ventro-subdistal, and three inner setae................ <i>T. gerlachi</i> (Brazil)

Research paper thumbnail of A new species of Eutrachytes (Acari: Uropodina: Eutrachytidae) associated with the indian mangrove (Avicennia officinalis)

Acarologia, 2016

A new species of Eutrachytes (Eutrachytes flagellatus) is described based on a complete ontogenet... more A new species of Eutrachytes (Eutrachytes flagellatus) is described based on a complete ontogenetic series, starting from larva and including the adult female and male. This Uropodina mite was isolated from the pneumatophore surface of Avicennia officinalis having algal (Bostryschia sp.) growth in Goa, India. Notable morphological attributes peculiar to immature instars of this species include a flagellate tubular dorsolateral respiratory structure extending from the peritreme, nude pygidial shields in the adult male and female and a deep concave formation at the posterolateral margins of the dorsal shield. A taxonomic discussion with salient diagnostic features of the genus is given and a key to genera of the family is presented. We present two nomenclature modifications: Deraiophoridae syn. nov. as the junior synonym of Eutrachytidae and Dentibaiulus Hirschmann, 1979 syn. nov. as a junior synonym of Eutrachytes Berlese, 1914. A compiled list of all new species discovered to date from mangrove roots in different parts of the world is given.

Research paper thumbnail of Description of a new mangrove root dwelling species of Teleotanais (Crustacea: Peracarida: Tanaidacea) from India, with a key to Teleotanaidae

Species Diversity, 2013

Specimens collected from India revealed a new species of the rare and plesiomorphic family Teleot... more Specimens collected from India revealed a new species of the rare and plesiomorphic family Teleotanaidae. One new species, Teleotanais indianis is described and can be diagnosed from the only two other known species in the genus by the following character combination: carapace shorter than pereonites 1-3 combined; antennule without pigmentation, distal article incompletely fused with article 4 and with distal and subdistal aesthestascs; cheliped fixed finger with five inner, three ventral, and one subdistal setae; uropodal endopod biarticulated.

Research paper thumbnail of Quantitative distribution of meiobenthos in the Gulf of Martaban, Myanmar Coast, north-east Andaman Sea

Indian Journal of Geo-Marine Sciences

Quantitative distribution of meiofauna in the depth range 20 to 1000 m of the Gulf of Martaban, A... more Quantitative distribution of meiofauna in the depth range 20 to 1000 m of the Gulf of Martaban, Andaman Sea was studied from 46 stations during a synaptic survey carried out in April-May 2002 of ORV Sagar Kanya Cruise SK175. Fauna was dominated by three taxa: free living nematodes (80%) benthic copepods (5.9%) and foraminiferans (2.8%). Other groups together contributed more than copepods in total abundance. Total density ranged between 40 and 612/10 cm 2 and dry weight biomass from 0.21 to 0.428 mg / 10 cm 2 in different sediment type and depth zone. Numerical abundance of meiofauna was high in fine silty clay and low in sandy bottom. Formation of three main clusters suggests the influence of dominant sediment texture of clayey sand sand silt clay, silty-clay clayey-silt, and sandy substratum. Fauna was contagiously distributed except at few stations where the distribution was regular. Meiofauna of the present study were similar to those of Andaman Sea and Bay of Bengal and the den...

Research paper thumbnail of Quantitative distribution of meiobenthos in the Gulf of Martaban, Myanmar Coast, north-east Andaman Sea

Indian Journal of Geo-Marine Sciences

Quantitative distribution of meiofauna in the depth range 20 to 1000 m of the Gulf of Martaban, A... more Quantitative distribution of meiofauna in the depth range 20 to 1000 m of the Gulf of Martaban, Andaman Sea was studied from 46 stations during a synaptic survey carried out in April-May 2002 of ORV Sagar Kanya Cruise SK175. Fauna was dominated by three taxa: free living nematodes (80%) benthic copepods (5.9%) and foraminiferans (2.8%). Other groups together contributed more than copepods in total abundance. Total density ranged between 40 and 612/10 cm 2 and dry weight biomass from 0.21 to 0.428 mg / 10 cm 2 in different sediment type and depth zone. Numerical abundance of meiofauna was high in fine silty clay and low in sandy bottom. Formation of three main clusters suggests the influence of dominant sediment texture of clayey sand sand silt clay, silty-clay clayey-silt, and sandy substratum. Fauna was contagiously distributed except at few stations where the distribution was regular. Meiofauna of the present study were similar to those of Andaman Sea and Bay of Bengal and the den...

Research paper thumbnail of Organic enrichment and benthic fauna–Some ecological consideration

Research paper thumbnail of Meiofaunal Distribution across the Oxygen Minimum Zone of Continental Margin, North East Arabian Sea

International Journal of Marine Science

A quantitative study of metazoan meiofauna across the oxygen minimum zone (OMZ) of continental ma... more A quantitative study of metazoan meiofauna across the oxygen minimum zone (OMZ) of continental margin in the N-E Arabian Sea in the depth range 500-1965 m was carried out in September-November 2008. Bottom water oxygen and sediment organic carbon showed large variation between stations. The bottom water temperature and salinity was very similar in the area. The fauna was dominated by nematoda followed by harpacticoid copepoda and polychaeta. Maximum meiofaunal density of 164/10 cm 2 was recorded at St. 1 (500 m) and the lowest density of 25/10 cm² was observed at St. 2 (650 m) which coincided with lowest oxygen concentration. Total abundance of meiofauna was significantly lower than those reported from other areas. The average density was high (65/10 cm 2) in OMZ than in non OMZ (52/10 cm 2) area. Nematodes were the dominant taxon at every station. The dominance was particularly significant at those stations having very low oxygen. The meiofaunal density was positively correlated with sediment organic carbon while oxygen exhibited a negative correlation. Epibenthic Crustacean groups were more in areas of non OMZ having high oxygen. Vertical distribution revealed consistent reduction in total density and major taxa with increasing depth in sed iment. Maximum density was recorded in top 0-2 cm layer. Among environmental parameters the availability of food in the form of sediment carbon appeared to be key factor in controlling meiofauna in study areas.

Research paper thumbnail of Seasonality and vertical distribution of epiphytic diatoms on the pneumatophore surface of mangrove Avicennia officinalis L

Research paper thumbnail of Status of Coastal Marine Biodiversity of Goa and Challenges for Sustainable Management - An Overview

Journal of Ecophysiology and Occupational Health, 2020

Degradation of marine and coastal ecosystem can be seen everywhere and Goa is no exception. Biodi... more Degradation of marine and coastal ecosystem can be seen everywhere and Goa is no exception. Biodiversity provide important services to mankind and needs to be protected. Goa is endowed with varied microhabitats along its 105 long coast line. These habitats are home to diverse forms of life about which little is known. The coastal waters serve as nursery to fishes and other animals which are exploited commercially. The present communication reviews the current status on the taxonomic knowledge of the coastal biodiversity of Goa. The coastal water of Goa abound in flora and fauna. The information on major fauna and flora of Goa is sufficiently available. There is, however, some lacunae in our knowledge on invertebrate subgroups, such as sponges, octocorals, ctenophores, and tunicates and minor phyla. The biodiversity of specialized ecosystems continued to be inadequately known and remains a challenge to specialists from Goa coast. Threat to coastal and marine biodiversity due to climate change and environmental degradation are intensifying with time. The anthropogenic activities are causing damage to pristine coastal ecosystems. The loss of biodiversity will be felt in greater strength by future generation. The present knowledge on coastal biodiversity warrants continued taxonomic research in the least-studied or unknown groups of hot spot areas in the light of existing threats to marine biodiversity. It is suggested that further research on new species occurrences in the least studied groups should be continued to update the data and improve our knowledge. The appropriate measures will be required to protect the rich biodiversity resources of Goa.

Research paper thumbnail of Seasonal variations and relationships between environmental parameters and heavy metal concentrations in tissues of Crassostrea species and in its ambience from the tropical estuaries

Environmental science and pollution research international, Jan 15, 2018

This study aimed to evaluate the relationship between physicochemical parameters and heavy metal ... more This study aimed to evaluate the relationship between physicochemical parameters and heavy metal (Cu, Ni, Pb, and Cd) concentrations from sediment, seawater, and its accumulation in tissues of oyster species (Crassostrea madrasensis and C. gryphoides) from the three sites (Chicalim Bay (CB), Nerul Creek (NC), Chapora Bay (ChB)) along the Goa coast (India). Results showed enrichment of Cu and Ni in sediment exceeding the effect range low (ERL) level. The higher concentrations of Cu and Ni in sediments and in suspended particulate matter (SPM) from all the study sites are indicative of severe contamination of estuarine and associated habitats. Moreover, particulate Ni (at all the sites), Cu (at NC and ChB), Pb (at NC), and Cd (at CB and NC) concentrations were recorded more than its total loadings in surface sediment. Concentration of Cu and Cd in oyster tissue was several folds higher than its concentration in ambience. Further, this study showed that the levels of metal in oysters a...

Research paper thumbnail of Effect of an oil spill from M V Sea Transporter on intertidal meiofauna at Goa, India

Marine Pollution Bulletin, 2002

Short and long term effects of a fuel oil spill from a grounded ship ''M V Sea Transporter'' on m... more Short and long term effects of a fuel oil spill from a grounded ship ''M V Sea Transporter'' on meiofauna of a sandy beach of central West Coast of India were investigated. A significant reduction in the absolute abundance of meiofauna was observed immediately after 3 days of spillage particularly at Sinquerim beach, the site of spillage. The reduction was most pronounced in density of nematodes and harpacticoid copepods, which were the most dominant groups. Long-term response showed no apparent oilinduced changes at major taxa levels. The population density improved considerably after the cessation of monsoons with a parallel decrease in petroleum hydrocarbon concentration in the sediment. Nematodes recovered more quickly than benthic copepods. No evidence for this could be due to reproductive dynamics in meiobentos. Although the effect of the oil on meiofauna could be seen initially it could not be proved conclusively on a long-term basis. The effects of the oil spill were confounded with seasonal monsoon effects and beach dynamics. The nematode:copepod ratio and the index of trophic diversity (ITD) were inadequate for detecting oil pollution effects. Therefore it may be concluded that in the presence of other environmental factors acting strongly, the effects of oil on meiofauna was strong but of a temporary nature.

Research paper thumbnail of Distribution, abundance and diversity of phytoplankton in the inshore waters of Nizampatnam, South East coast of India

Indian Journal of Geo-Marine Sciences

Distribution, abundance and species assemblages of Phytoplankton were studied from inshore waters... more Distribution, abundance and species assemblages of Phytoplankton were studied from inshore waters of Nizampatnam, South East coast of India in March 2007. Significant spatial variations in temperature, pH, salinity, dissolved oxygen (DO), nitrites (NO 2) –N), nitrates (NO 3) – N), phosphate (PO 4) –P), silicate (SiO 4) – (Si) were monitored. A total of 90 species of phytoplankton (net hauls) represented by 5 groups were identified at nine stations, collected along three transects during low tide. Percentage contribution of each group of phytoplankton was in the order: Bacillariophyceans > Dinophyceans > Cyanophyceans > Euglenophyceans. Pleurosigma angulatum, Navicula sp. were dominant species in the study area. Bray -Curtis similarity and group average clustering, recommended identifying two assemblages of phytoplankton in the study area. High diversity of phytoplankton in the present area suggests stable environmental conditions. Introduction Phytoplankton is one of the bi...

Research paper thumbnail of Studies on the reproductive biology of Indian Sand Whiting Sillago sihama (Forsskal)

Sillago sihama have a prolonged breeding season from June to December, with spawning activity pea... more Sillago sihama have a prolonged breeding season from June to December, with spawning activity peaked during the period of September to November. Length at first maturity stage was found to vary between 155-164 mm (total length) in both sexes. Although overall sex ratio indicated predominance of female, Chi-square test ( x 2 ) showed no significant difference throughout the year. Fecundity varied from 11,376 to 103,695 per fish, is significantly correlated with total length (r = 0.85, ρ < 0.01), body weight (r = 0.88, ρ < 0.01) and ovary weight (r = 0.87, ρ < 0.01). (Keywords : Sillago sihama, Reproduction, Spawning, Fecundity, Sex ratio )

Research paper thumbnail of Macrobenthic Communities of the Coastal Waters of Dabhol, West Coast of India

Indian Journal of Marine Sciences, 2002

Indian Journal of Marine Sciences Vol. 31(2), June 2002, pp. 93-99 ... Macrobenthic communities o... more Indian Journal of Marine Sciences Vol. 31(2), June 2002, pp. 93-99 ... Macrobenthic communities of the coastal waters of Dabhol, west coast of India ... Baban Ingole∗, Nimi Rodrigues & Zakir Ali Ansari ... Biological Oceanography Division, National Institute of Oceanography, Dona ...

Research paper thumbnail of Total petroleum hydrocarbon in the tissue of some commercially important fishes of Bay of Bengal

The present study reports the level of total petroleum hydrocarbon (TPH) in 27 commercially impor... more The present study reports the level of total petroleum hydrocarbon (TPH) in 27 commercially important fish, crustaceans and cephalopods from Orissa coast, Bay of Bengal to provide the baseline data for oil contamination in marine biota. The results showed significant differences in the TPH concentration in different species. Of all fish, Carangoides malabaricus showed the maximum TPH level (av. 13.70 µg g-1). In cephalopods, Loligo recorded the maximum TPH (av. 14.87 µg g-1) while Metapenaeus dobsoni recorded the maximum TPH (av. 13.18 µg g-1) among crustaceans. The concentration of TPH recorded in the present study were higher than the reported values from other studies in Bay of Bengal but were comparable with those of other Indian coast and Gulf water. The species recording maximum concentration and giving significant correlation coefficient may be of interest in oil pollution monitoring and can be used as indicator of hydrocarbon pollution in the region.

Research paper thumbnail of Total petroleum hydrocarbon in the tissues of some commercially important fishes of the Bay of Bengal

Marine Pollution Bulletin, 2012

The present study reports the level of total petroleum hydrocarbon (TPH) in 27 commercially impor... more The present study reports the level of total petroleum hydrocarbon (TPH) in 27 commercially important fish, crustaceans and cephalopods from Orissa coast, Bay of Bengal to provide the baseline data for oil contamination in marine biota. The results showed significant differences in the TPH concentration in different species. Of all fish, Carangoides malabaricus showed the maximum TPH level (av. 13.70 µg g-1). In cephalopods, Loligo recorded the maximum TPH (av. 14.87 µg g-1) while Metapenaeus dobsoni recorded the maximum TPH (av. 13.18 µg g-1) among crustaceans. The concentration of TPH recorded in the present study were higher than the reported values from other studies in Bay of Bengal but were comparable with those of other Indian coast and Gulf water. The species recording maximum concentration and giving significant correlation coefficient may be of interest in oil pollution monitoring and can be used as indicator of hydrocarbon pollution in the region.

Research paper thumbnail of Fig. 1 in Description of a New Mangrove Root Dwelling Species of Teleotanais (Crustacea: Peracarida: Tanaidacea) from India, with a Key to Teleotanaidae

Fig. 1. Teleotanais indiaensis sp. nov. A, holotype, habitus, lateral view; B, paratype, habitus,... more Fig. 1. Teleotanais indiaensis sp. nov. A, holotype, habitus, lateral view; B, paratype, habitus, dorsal view; C, antennule; D, antenna; E, labrum, lateral view. Scale bars: 1.0 mm for A–B, 0.25 mm for C–D, 0.1 mm for E.

Research paper thumbnail of Fig. 3 in Description of a New Mangrove Root Dwelling Species of Teleotanais (Crustacea: Peracarida: Tanaidacea) from India, with a Key to Teleotanaidae

Fig. 3. Teleotanais indiaensis sp. nov. paratype. A, cheliped; B, pereopod 1; C, pereopod 2; D, p... more Fig. 3. Teleotanais indiaensis sp. nov. paratype. A, cheliped; B, pereopod 1; C, pereopod 2; D, pereopod 3; E, pereopod 4; F, pereopod 5; G, pereopod 6. Scale bars: 0.25 mm for A, 0.1 mm for B–G.

Research paper thumbnail of Fig. 2 in Description of a New Mangrove Root Dwelling Species of Teleotanais (Crustacea: Peracarida: Tanaidacea) from India, with a Key to Teleotanaidae

Fig. 2. Teleotanais indiaensis sp. nov. paratype. A, left mandible; B, right mandible; C, labium;... more Fig. 2. Teleotanais indiaensis sp. nov. paratype. A, left mandible; B, right mandible; C, labium; D, maxillule, endite; E, same, palp; F, maxilliped; G, epignath; H, pleopod; I, uropod. Scale bars 0.1 mm.

Research paper thumbnail of Teleotanais Lang 1956

Genus <i>Teleotanais</i> Lang, 1956 <b>Revised diagnosis.</b> Female. Wit... more Genus <i>Teleotanais</i> Lang, 1956 <b>Revised diagnosis.</b> Female. With mottled dorsal pigmentation. Eye lobes and pigmented eyes present. First four pleonites each bearing pair of articulated, plumose midlateral setae, last pleonite bearing pair of simple midlateral setae. Antenna articles 2 and 3 without dorsodistal spiniform setae, article 3 with proximal, medial, and distal dorsal setae. Maxillule with palp bearing one or two distal setae. Maxillipedal endite not expanded, distally armed with single seta and two or three fine, pointed spine. Fixed finger of cheliped with raised inner ridge. Carpus of pereopods 2–3 without spiniform setae. Posterior pereopods with distal spiniform seta on merus, carpus, and propodus; dactylus plus unguis claw-shaped but these elements unfused. Basal articles of pleopods with single dorsal plumose seta. Uropods shorter than pleotelson; exopod with two articles, endopod with one or two articles. We believe that the presen...

Research paper thumbnail of Teleotanais Lang 1956

Key to the genus <i>Teleotanais</i> 1. Maxillipedal endites with two pointed spinifor... more Key to the genus <i>Teleotanais</i> 1. Maxillipedal endites with two pointed spiniform setae. Uropodal endopod uniarticulate. Pleopodal endopod with two inner setae.............. <i>T. warragamba</i> (Australia) – Maxillipedal endites with three pointed spiniform setae. Pleopodal endopod with one inner seta. Uropodal endopod biarticulate................................................... 2 2. Cephalothorax shorter than pereonites 1–3 combined. Cheliped fixed finger with two ventral, one ventro-subdistal, and four inner setae............... <i>T. indiaensis</i> (India) – Cephalothorax as long as pereonites 1–3 combined. Cheliped fixed finger with one ventral, one ventro-subdistal, and three inner setae................ <i>T. gerlachi</i> (Brazil)

Research paper thumbnail of A new species of Eutrachytes (Acari: Uropodina: Eutrachytidae) associated with the indian mangrove (Avicennia officinalis)

Acarologia, 2016

A new species of Eutrachytes (Eutrachytes flagellatus) is described based on a complete ontogenet... more A new species of Eutrachytes (Eutrachytes flagellatus) is described based on a complete ontogenetic series, starting from larva and including the adult female and male. This Uropodina mite was isolated from the pneumatophore surface of Avicennia officinalis having algal (Bostryschia sp.) growth in Goa, India. Notable morphological attributes peculiar to immature instars of this species include a flagellate tubular dorsolateral respiratory structure extending from the peritreme, nude pygidial shields in the adult male and female and a deep concave formation at the posterolateral margins of the dorsal shield. A taxonomic discussion with salient diagnostic features of the genus is given and a key to genera of the family is presented. We present two nomenclature modifications: Deraiophoridae syn. nov. as the junior synonym of Eutrachytidae and Dentibaiulus Hirschmann, 1979 syn. nov. as a junior synonym of Eutrachytes Berlese, 1914. A compiled list of all new species discovered to date from mangrove roots in different parts of the world is given.

Research paper thumbnail of Description of a new mangrove root dwelling species of Teleotanais (Crustacea: Peracarida: Tanaidacea) from India, with a key to Teleotanaidae

Species Diversity, 2013

Specimens collected from India revealed a new species of the rare and plesiomorphic family Teleot... more Specimens collected from India revealed a new species of the rare and plesiomorphic family Teleotanaidae. One new species, Teleotanais indianis is described and can be diagnosed from the only two other known species in the genus by the following character combination: carapace shorter than pereonites 1-3 combined; antennule without pigmentation, distal article incompletely fused with article 4 and with distal and subdistal aesthestascs; cheliped fixed finger with five inner, three ventral, and one subdistal setae; uropodal endopod biarticulated.

Research paper thumbnail of Quantitative distribution of meiobenthos in the Gulf of Martaban, Myanmar Coast, north-east Andaman Sea

Indian Journal of Geo-Marine Sciences

Quantitative distribution of meiofauna in the depth range 20 to 1000 m of the Gulf of Martaban, A... more Quantitative distribution of meiofauna in the depth range 20 to 1000 m of the Gulf of Martaban, Andaman Sea was studied from 46 stations during a synaptic survey carried out in April-May 2002 of ORV Sagar Kanya Cruise SK175. Fauna was dominated by three taxa: free living nematodes (80%) benthic copepods (5.9%) and foraminiferans (2.8%). Other groups together contributed more than copepods in total abundance. Total density ranged between 40 and 612/10 cm 2 and dry weight biomass from 0.21 to 0.428 mg / 10 cm 2 in different sediment type and depth zone. Numerical abundance of meiofauna was high in fine silty clay and low in sandy bottom. Formation of three main clusters suggests the influence of dominant sediment texture of clayey sand sand silt clay, silty-clay clayey-silt, and sandy substratum. Fauna was contagiously distributed except at few stations where the distribution was regular. Meiofauna of the present study were similar to those of Andaman Sea and Bay of Bengal and the den...

Research paper thumbnail of Quantitative distribution of meiobenthos in the Gulf of Martaban, Myanmar Coast, north-east Andaman Sea

Indian Journal of Geo-Marine Sciences

Quantitative distribution of meiofauna in the depth range 20 to 1000 m of the Gulf of Martaban, A... more Quantitative distribution of meiofauna in the depth range 20 to 1000 m of the Gulf of Martaban, Andaman Sea was studied from 46 stations during a synaptic survey carried out in April-May 2002 of ORV Sagar Kanya Cruise SK175. Fauna was dominated by three taxa: free living nematodes (80%) benthic copepods (5.9%) and foraminiferans (2.8%). Other groups together contributed more than copepods in total abundance. Total density ranged between 40 and 612/10 cm 2 and dry weight biomass from 0.21 to 0.428 mg / 10 cm 2 in different sediment type and depth zone. Numerical abundance of meiofauna was high in fine silty clay and low in sandy bottom. Formation of three main clusters suggests the influence of dominant sediment texture of clayey sand sand silt clay, silty-clay clayey-silt, and sandy substratum. Fauna was contagiously distributed except at few stations where the distribution was regular. Meiofauna of the present study were similar to those of Andaman Sea and Bay of Bengal and the den...

Research paper thumbnail of Organic enrichment and benthic fauna–Some ecological consideration

Research paper thumbnail of Meiofaunal Distribution across the Oxygen Minimum Zone of Continental Margin, North East Arabian Sea

International Journal of Marine Science

A quantitative study of metazoan meiofauna across the oxygen minimum zone (OMZ) of continental ma... more A quantitative study of metazoan meiofauna across the oxygen minimum zone (OMZ) of continental margin in the N-E Arabian Sea in the depth range 500-1965 m was carried out in September-November 2008. Bottom water oxygen and sediment organic carbon showed large variation between stations. The bottom water temperature and salinity was very similar in the area. The fauna was dominated by nematoda followed by harpacticoid copepoda and polychaeta. Maximum meiofaunal density of 164/10 cm 2 was recorded at St. 1 (500 m) and the lowest density of 25/10 cm² was observed at St. 2 (650 m) which coincided with lowest oxygen concentration. Total abundance of meiofauna was significantly lower than those reported from other areas. The average density was high (65/10 cm 2) in OMZ than in non OMZ (52/10 cm 2) area. Nematodes were the dominant taxon at every station. The dominance was particularly significant at those stations having very low oxygen. The meiofaunal density was positively correlated with sediment organic carbon while oxygen exhibited a negative correlation. Epibenthic Crustacean groups were more in areas of non OMZ having high oxygen. Vertical distribution revealed consistent reduction in total density and major taxa with increasing depth in sed iment. Maximum density was recorded in top 0-2 cm layer. Among environmental parameters the availability of food in the form of sediment carbon appeared to be key factor in controlling meiofauna in study areas.

Research paper thumbnail of Seasonality and vertical distribution of epiphytic diatoms on the pneumatophore surface of mangrove Avicennia officinalis L