Sediment-ostracode relationship in the Bimili backwater and the Balacheruvu tidal stream

Annapurna, C.; Sarma, D V Rama

doi:10.1007/bf03185021

Cited by 3 publications

(4 citation statements)

References 7 publications

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“…In the Bimili backwaters and Balacheruvu tidal stream, Annapurna and Rama Sarma (1982) have noted that the genus Phlyctenophora occurs in forms such as Tanella, Loxoconcha, Pajenborchellina and Kalingella occur in considerable numbers in the sandy areas. Al-Abdul Razzaq et al (1983) stated that ostracoda occur more in fine-grained sediments due to the greater quantities of organic material in those fractions which provide nutritive material.…”

Section: Substrate and Ostracodesmentioning

confidence: 99%

“…Although there are research papers on taxonomy, systematic studies on internal character such as the normal pore system, muscle scar pattern and ocular sinuses of these micro crustaceans, papers pertaining to surface ornamentation of Ostracoda are relatively rare (Jones, 1956;Benson, 1961;Hulings and Puri, 1964;Puri, 1966;Krutak, 1972;Brasier, 1980;Annapurna and Rama Sarma, 1982;Vaidya et al, 1995;Sridhar et al, 1998 andHussain et al, 2002). Hence, an attempt has been made to study briefly on the relationship between the sculpture in Ostracoda and grain size of the substrate based on direct observations by a Scanning Electron Microscope (SEM).…”

Section: Surface Ornamentation and Sediment Texturementioning

confidence: 99%

“…Puri (1966) and Malz and Lord (1976) are of the opinion that more ornate and rather heavily calcified forms are present commonly in shallow water high-energy environments and inhabit sandy substrates in modern seas. In the Bimili backwaters and Balacheruvu tidal stream, Annapurna and Rama Sarma (1982) noticed that the genus Phlyctenophora occurs in sand dominated areas and not in muddy areas. They further noticed that the moderately ornamented forms like Tanella, Loxoconcha, Paijenborchellina and Kalingella occur in considerable numbers in sandy areas.…”

Section: Surface Ornamentation and Sediment Texturementioning

confidence: 99%

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Textural characteristics and distribution of ostracoda in core sediments from the Gadilam river estuary, Cuddalore, Tamil Nadu, southeast coast of India

S M

et al. 2023

JIAS

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To know the distribution of brackish water Ostracoda and to investigate the sediment characteristics, a core (105 cm) has been collected from the Gadilam river estuary and it was sub-sampled into 21 samples at 5 cm width regular interval. All the sediment samples were analyzed as per standard micropaleontological techniques in order to investigate the distribution and occurrence of ostracod fauna. A total of 27 ostracod taxa belonging to 16 genera, 12 families, 3 superfamilies and 2 sub-order of the order Podocopida, have been identified based on published articles Throughout the core (from top to bottom) the calcareous forms were noticed. The ostracod species Kalingella mckenziei and Jankeijcythere mckenziei are widely distributed in the core and they outnumbered the rest of the species. The faunal assemblages recorded are tropical, brackish to neritic (shallow marine) and benthic in nature (Hemicytheridea paiki, Hemicytheridea bhatiai, Jankeijcythere mckenziei, Kalingella mckenziei, Neosinocythere dekrooni, Paijenborchellina sp., Stigmatocythere indica and Tanella gracilis). In the analyzed core, there is no faunal assemblage at the depth between 80-85 and 95-105 cm. The sediment characteristics such as calcium carbonate, organic matter and sand-silt-clay ratio also determined and correlated with the observed ostracod populations. Based on the detailed study, it is noticed that high calcium carbonate and low organic matter of the sediment are congenial for population abundance. From the overall distribution of Ostracoda in all the subsamples, siltysand is found to an accommodative substrate for the prosperity of Ostracoda. The statistical aspect of ostracod carapace-valve ratio has been studied to identify the rate of sedimentation which infers a faster rate of deposition of sediments in the Gadilam River estuary.

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Section: Substrate and Ostracodesmentioning

confidence: 99%

Section: Surface Ornamentation and Sediment Texturementioning

confidence: 99%

Section: Surface Ornamentation and Sediment Texturementioning

confidence: 99%

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Textural characteristics and distribution of ostracoda in core sediments from the Gadilam river estuary, Cuddalore, Tamil Nadu, southeast coast of India

S M

et al. 2023

JIAS

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“…Consequently, diverse sedimentary facies support distinct ostracod assemblages. According to Annapurna and Rama Sarma (1982), ostracods prefer areas high in sand and clay rather than areas rich in silt, as in the Bimili backwaters and Balacheruvu tidal stream. Similar relationship has also been observed in marine marginal water bodies of other localities (Elofson, 1941;Benson, 1959).…”

Section: Substratementioning

confidence: 99%

Distribution and statistical aspects of Ostracoda from the Pulicat lagoon, Tamil Nadu: Implications on siltation and microenvironment

Hussain¹,

Mahalakshmi²,

Radhakrishnan³

2019

PINSA

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Ostracods are bivalved tiny Crustaceans; inhabit almost all types of aquatic environments. In order to study the systematic and distribution of recent brackish water Ostracoda from the Pulicat lagoon, near Chennai, Tamil Nadu, a total of twelve surface sediment samples and one core were collected from Pulicat lagoon. A total of a total of 37 ostracod taxa belonging to 24 genera, 14 families, 2 superfamilies, and 2 suborders of the order Podocopida have been identified. Among these, Cytherelloidea leroyi belong to suborder Platycopa and the remaining 36 species to suborder Podocopa are recorded from Pulicat lagoon.Geochemical and sedimentological parameters such as CaCO 3 , Organic matter and sand-silt-clay ratio were estimated. An attempt has been made to study the relation between the sediment characteristics (the substrate of the Pulicat lagoon samples consists of sand and silty-sand) and Ostracoda population, and evaluate the favourable substrate for the population abundance in the area. From the distribution of Ostracoda, it is inferred that the sandy substrate is congenial sediment type for the population abundance and distribution. The implications of the proxies like Ostracod surface ornamentation, carapace and valve ratio and other environmental interpretations from the Pulicat lagoon are presented in this paper. The ratio between the carapaces and open valves of Ostracoda has been taken into consideration for determining the rate of sedimentation. Among a total of 1910 Ostracod shells recovered in surface and core, specimens 1469 are carapaces, while the remaining 441 specimens are open valves. Based on this observation, it may be concluded that a relatively rapid rate of sedimentation prevails in the Pulicat lagoon.

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Distribution of Benthic Ostracoda in surface and subsurface backwater sediments of Ernakulam, Kerala, Southwest coast of India: Microenvironmental Implications

Hussain

2013

Proceedings of XXIII Indian Colloquium on Micropaleontology and Stratigraphy and International Symposium on Global Bioevents In

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Fourteen surface and two core sediment samples were collected from the backwaters of Cochin, Kerala, southwest coast of India, in order to study the systematics and distribution of Recent Ostracoda. The ostracod taxa were separated from the sediments applying standard micropaleontological techniques. A total of 20 Ostracod species belonging to 17 genera and 8 families were identified. Sediment parameters such as CaCO3, organic matter and sand-silt-clay ratio were estimated for the surface as well as core samples in order to determine the relationship between substrate and Ostracoda populations, and to evaluate the favoured substrate of dominant species populations. The down core distribution of sediment parameters and ostracod assemblages is presented. Based on this data we determine that ostracods favour silty-sandy substrate environments. The rate of sedimentation was determined based on the ratio between the carapace and open valves of Ostracoda. The benthic ostracod fauna recorded is characteristic of a tropical, brackish to epi-neritic environment and few warm, shallow marine species occur in the backwaters of Cochin, may be due to the tidal influence.

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Sediment-ostracode relationship in the Bimili backwater and the Balacheruvu tidal stream

Cited by 3 publications

References 7 publications

Textural characteristics and distribution of ostracoda in core sediments from the Gadilam river estuary, Cuddalore, Tamil Nadu, southeast coast of India

Textural characteristics and distribution of ostracoda in core sediments from the Gadilam river estuary, Cuddalore, Tamil Nadu, southeast coast of India

Distribution and statistical aspects of Ostracoda from the Pulicat lagoon, Tamil Nadu: Implications on siltation and microenvironment

Distribution of Benthic Ostracoda in surface and subsurface backwater sediments of Ernakulam, Kerala, Southwest coast of India: Microenvironmental Implications

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