The Ecology of Asterorotalia Trispinosa (Thalmann, 1933)-- New Insights from Muthupet Lagoon, Southeast Coast of India

Rao, N. Rajeshwara; Jayaprakash, M.; Velmurugan, P. M.

doi:10.2113/gsjfr.43.1.14

Cited by 13 publications

(11 citation statements)

References 12 publications

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“…Rather, A. trispinosa prefers regions with salinity varying within a range, as observed in areas affected by the riverine influx. A similar conclusion was also drawn by Rao et al (2013), based on the ecology of A. trispinosa from Muthupet Lagoon on the east coast of India. They reported that A. trispinosa is euryhaline rather than a typically marine fauna, with an ability to tolerate salinity only as low as 29 psu.…”

Section: Relationship With Seawater Temperature-salinitysupporting

confidence: 80%

“…The pH of the Ganga-Brahmaputra rivers (8.13) is higher than the Mahanadi (7.020), Krishna (7.219) and Godavari Rivers (7.470) (Sarma et al, 2012). Rao et al (2013) also observed a positive relationship between A. trispinosa relative abundance and pH. Since pH values are missing for a few of the sampling locations, we could not include pH in the statistical analyses.…”

Section: Other Factors (Dissolved Oxygen Ph)mentioning

confidence: 97%

“…The enormous amount of fresh water influx from these rivers considerably decreases the seawater salinity. Several previous workers have mentioned that salinity is an important factor that influences A. trispinosa distribution (Rao, 1998;Rana, 2009;Panchang and Nigam, 2012;Rao et al, 2013). The reported high relative abundance of A. trispinosa in only the outer channel of the Chilka Lagoon (Jayalakshmy and Rao, 2001), however, suggests that it does not tolerate very low salinity water.…”

Section: Relationship With Seawater Temperature-salinitymentioning

confidence: 99%

“…distribution. A. trispinosa is abundant in silty sand and muddy substrate (Inoue, 1989;Rao et al, 1990;Orpin et al, 1999;Gallagher et al, 2009;Gandhi and Solai, 2010;Panchang and Nigam 2012;Natsir et al, 2012;Rao et al, 2013). Ghose (1966) discussed the significance of spines in A. trispinosa and inferred that the long slender spines helped the species to increase its buoyancy to remain suspended just above the substrate.…”

Section: Relationship With Substratementioning

confidence: 99%

“…workers to use its relative abundance as a paleomonsoon proxy (Panchang and Nigam, 2012). However, recently, Rao et al (2013) studied the ecology of A. trispinosa from Muthupet Lagoon in the east coast of India and reported that this species is euryhaline rather than a typically marine fauna, but with an ability to tolerate salinity only as low as 29 psu. Additionally, the substrate preference of A. trispinosa is also debated with several workers reporting it being dominant in fine-grained silty to muddy substrates and others reporting its abundant presence in the medium grained (silty-sand) substrates (Jayaraju et al, 2011).…”

mentioning

confidence: 99%

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Abundance and Ecology of EndemicAsterorotalia trispinosafrom the Western Bay of Bengal: Implications for its Application as a Paleomonsoon Proxy

Saraswat

Manasa

Suokhrie

et al. 2017

Acta Geologica Sinica (Eng)

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A total of 97 surface sediment samples were collected from the continental shelf and slope of the western Bay of Bengal to assess the potential application of Asterorotalia trispinosa as a paleomonsoon proxy. The relative abundance of living as well as total (living and dead) A. trispinosa ranges from being absent to a maximum of ∼31%. The highest abundance of A. trispinosa is close to the outfall region of the Ganga‐Brahmaputra Rivers and decreases away from the river mouths. Contrary to that, A. trispinosa is rare in front of both the Cauvery and Pennar river outfall regions, in the central part of the western Bay of Bengal. The living A. trispinosa abundance is the lowest in between two major river systems, viz. Ganga‐Brahmaputra‐Mahanadi and Krishna‐Godavari. The relative abundance of both the total and living A. trispinosa is strongly positively correlated with ambient seawater temperature, and negatively correlated with %Corg and salinity. Based on the spatial distribution, we conclude that A. trispinosa is stenohaline in nature, rather than euryhaline, and further that the increased relative abundance of A. trispinosa indicates warmer and only marginally hyposaline environment. Even though the ecological preference of A. trispinosa suggests it as a potential paleomonsoon proxy, the restricted distribution implies limited application.

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Section: Relationship With Seawater Temperature-salinitysupporting

confidence: 80%

Section: Other Factors (Dissolved Oxygen Ph)mentioning

confidence: 97%

Section: Relationship With Seawater Temperature-salinitymentioning

confidence: 99%

Section: Relationship With Substratementioning

confidence: 99%

mentioning

confidence: 99%

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Abundance and Ecology of EndemicAsterorotalia trispinosafrom the Western Bay of Bengal: Implications for its Application as a Paleomonsoon Proxy

Saraswat

Manasa

Suokhrie

et al. 2017

Acta Geologica Sinica (Eng)

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Modern and relict foraminiferal biofacies from a carbonate ramp, offshore Kuwait, northwest Persian Gulf

Parker

Gischler

2015

Facies

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Assessing the suitability of benthic foraminiferal morpho-groups to reconstruct paleomonsoon from Bay of Bengal

2016

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Temporal changes in benthic foraminiferal morpho-groups were suggested as an effective proxy to reconstruct past monsoon intensity from the Arabian Sea. Here, in order to test the applicability of temporal variation in morpho-groups to reconstruct past monsoon intensity from the Bay of Bengal, we have documented recent benthic foraminiferal distribution from the continental shelf region of the northwestern Bay of Bengal. Based on the external morphology, benthic foraminifera were categorized into rounded symmetrical (RSBF) and angular asymmetrical benthic foraminifera (AABF). Additionally, a few other dominant groups were also identified based on test composition (agglutinated, calcareous) and abundance (Asterorotalids and Nonions). The relative abundance of each group was compared with the ambient physico-chemical conditions, including dissolved oxygen, organic matter, salinity and temperature. We report that the RSBF are abundant in comparatively warm and well oxygenated waters of low salinity, suggesting a preference for high energy environment, whereas AABF dominate relatively cold, hypersaline deeper waters with low dissolved oxygen, indicating a low energy environment. The agglutinated foraminifera, Asterorotalids and Nonions dominate shallow water, low salinity regions, whereas the calcareous benthic foraminiferal abundance increases away from the riverine influx regions. Food availability, as estimated from organic carbon abundance in sediments, has comparatively less influence on faunal distribution in the northwestern Bay of Bengal, as compared to dissolved oxygen, temperature and salinity. We conclude that the factors associated with freshwater influx affect the distribution of benthic foraminiferal morpho-groups in the northwestern Bay of Bengal and thus it can be used to reconstruct past monsoon intensity from the Bay of Bengal.

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The Ecology of Asterorotalia Trispinosa (Thalmann, 1933)-- New Insights from Muthupet Lagoon, Southeast Coast of India

Cited by 13 publications

References 12 publications

Abundance and Ecology of EndemicAsterorotalia trispinosafrom the Western Bay of Bengal: Implications for its Application as a Paleomonsoon Proxy

Abundance and Ecology of EndemicAsterorotalia trispinosafrom the Western Bay of Bengal: Implications for its Application as a Paleomonsoon Proxy

Modern and relict foraminiferal biofacies from a carbonate ramp, offshore Kuwait, northwest Persian Gulf

Assessing the suitability of benthic foraminiferal morpho-groups to reconstruct paleomonsoon from Bay of Bengal

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