Sediment - ostracode relationship in the gulf of Mannar, off Toticorin, east coast of India

Hussain, S. M.; Manivannan, V.; Ragothaman, V.

doi:10.3126/jngs.v15i0.32121

Cited by 2 publications

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“…The association of CaCO3 with sand fractions is indicating its association with sand fraction. Similarly, Hussain et al (1997) also observed a relationship between CaCO3 and sand fractions in the Gulf of Mannar sediments, off Tuticorin. The calcium carbonate percentage in the sediment cores ranges from 0.5 to 5.5 % (Table 1), which is higher particularly in the top portion of the core between 0 and 25 cm.…”

Section: Sediment Characteristics Calcium Carbonate (Caco3)mentioning

confidence: 60%

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: Sediment Characteristics Calcium Carbonate (Caco3)mentioning

confidence: 60%

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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“…The observations acquired from the surface ornamentation of ostracod carapaces can directly be related to their substrate type. The majority of the specimens from the current study have ornate, often heavily calcified carapaces, which suggests that they are typically found in sandy substrates and high-energy shallow water environments (Hussain et al, 1997).…”

Section: Resultsmentioning

confidence: 91%

“…Instead of rock weathering, the primary source of carbonate may be the precipitation of CaCO 3 by marine organisms. Hussain et al (1997) observed a relative decrease in the organic matter along with an increase in the CaCO 3 content of the sediments patronising a maximum population of Ostracoda in the Gulf of Mannar, off Tuticorin. However, there is no proper correlation between sediment parameters and total population in the present study.…”

Section: Resultsmentioning

confidence: 99%

“…The nature of bottom sediments such as grain size, sorting coefficient and the presence or absence of bottom vegetation has a significant influence on the Ostracoda distribution (Hussain et al, 1997). In the present study, an attempt was made to bring out the relationship between the nature of substrate and the ostracod population.…”

Section: Resultsmentioning

confidence: 99%

“…Factors influencing ostracod distribution at different scales are governed by temporal and physicochemical stabilities of the ecosystems where ostracods are living and can be estimated by scaling the alpha and beta diversity of the assemblages (Smith & Horne, 2002). Several studies have been conducted on ostracod fauna from the Indian subcontinent (Baskar et al, 2015; Hussain, 1998; Hussain et al, 2006, 2007; Nazeer et al, 2018; Nishath et al, 2015, 2017; Radhakrishnan et al, 2022; Rajkumar et al, 2020; Sridhar et al, 2002, 2019). The study about ostracods is very scarce in the fragile islands of the Gulf of Mannar.…”

Section: Introductionmentioning

confidence: 99%

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Distribution of recent benthic Ostracoda around, Appa Island, Gulf of Mannar, India

Radhakrishnan,

Hussain,

Prakasheswar

et al. 2023

Journal of the Palaeontological Society of India

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The present work reports the distribution of Ostracoda from the surface sediments around Appa Island in the Gulf of Mannar, Tamil Nadu, southeast coast of India. In total, 33 surface sediment and bottom-water samples were collected for this study. In the study area, 34 Ostracoda species belonging to 30 genera, 17 families, 4 superfamilies, 3 suborders, 2 orders and 2 subclasses have been identified. Distribution of species as abundant, common and rare, for every station is being recorded. Among the identified 33 ostracod species, 5 are abundant, 4 are common and the remaining 24 are rare. The total population is higher in the southern part of the island, whereas the northern part of the island has a lower population comparatively. The Ostracoda are indicative of high energy, oxygenated environments in the study area, not conducive for juvenile forms. The ratio of carapaces to open valves of Ostracoda indicates a relatively moderate rate of sedimentation.

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Sediment - ostracode relationship in the gulf of Mannar, off Toticorin, east coast of India

Cited by 2 publications

References 0 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 of recent benthic Ostracoda around, Appa Island, Gulf of Mannar, India

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