Polychaete assemblage driven by substrate composition along the coastal waters of the South-eastern Arabian Sea

Rengaiyan, Periasamy; De, Kalyan; Ingole, Baban

doi:10.1016/j.rsma.2017.09.004

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…The highest dominance was observed in the mixture of clay-silt sediments (26% clay; 74% silt) with Simpson index of dominance C = 0.92 while the lowest dominance was in sand-silt sediments (81% sand & 19% silt), Simpson index of dominance (C) was 0.27. Highest polychaetes dominance in the clay-silt sediments supports Mosbahi, Pezy, Dauvin and Neifar (2016), Rengaiyan and Ingole (2017) findings in which Polycheates had the highest assemblage in fine sand and silt-clay sediments along the coastal waters of South-eastern Arabian Sea and in the intertidal zone of Kneiss islands respectively. Medium sized sediments like silt and sand have more interstitial spaces for polychaetes to burrow through and contain a moderate amount of organic matter adequate for polychaetes to acquire energy as deposit feeders (Musale & Desai, 2011;Sasikala et al, 2017).…”

Section: Influence Of Sediment Type and Toc On Benthic Macrofaunasupporting

confidence: 55%

“…The difference in variances of organic carbon and benthic macrofauna diversity indices using One Way Analysis of Variance showed Therefore, the observed highest species diversity in silt-sand sediments reveals that water velocity in the area is relatively low to support deposition of fine sand-silt sediments and allows the deposition of detritus on which deposit feeders feed (Vanaverbeke, Merckx, Dgraer & Vincx, 2011;Waye-Barker, 2015). Fine sands and silt sediments contain adequate organic matter content and are stable substrate to support macrobenthic faunal anchorage and filter feeding mechanism without sediment particles clogging to the feeding apparatus (Joydas & Damodaran, 2009;Rengaiyan & Ingole, 2017).…”

Section: Influence Of Sediment Type and Toc On Benthic Macrofaunamentioning

confidence: 99%

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Assessment of Sediment and Benthic Macrofauna Distribution at Dar es Salaam Harbour Channel

Mwakisunga¹,

Machiwa²,

Pratap³

2020

GEP

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Sediment and macrobenthic fauna distribution at Dar es Salaam harbour channel were investigated to attest the influence of sediment grain size distribution and total organic carbon contents on benthic macrofauna dominance and diversity. Sampling campaign was conducted from January to April, 2019 in 25 sampling stations along the channel. Sediment grain sizes ranged between 0.7405 and 0.00273 mm with an average of 0.0804 mm classified as medium silt. Sediment distribution showed an onshore-offshore pattern consisting of fine dark clay-silt sediments in the southern part of the harbour close to Mwalimu Nyerere Bridge, medium (sandy) at the harbour and coarse sandy offshore. Five classes of macrofauna were identified with sedentary Polychaetes (Diopatra cuprea) found in tubes and free forms being dominant in most of the sediment types, however more abundant in clay-silt. High species diversity index values were encountered in sediments with medium total organic carbon (TOC) and sediment grain sizes (sand-silt). Apparently, low species similarity indices were observed in all sediment type indicating significant dissimilarities in species composition among sediment grain sizes. Thus, the distribution of benthic macrofauna species along Dar es Salaam harbour channel is strongly influenced by the sediment grain sizes and organic carbon contents in sediments.

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Section: Influence Of Sediment Type and Toc On Benthic Macrofaunasupporting

confidence: 55%

Section: Influence Of Sediment Type and Toc On Benthic Macrofaunamentioning

confidence: 99%

Assessment of Sediment and Benthic Macrofauna Distribution at Dar es Salaam Harbour Channel

Mwakisunga¹,

Machiwa²,

Pratap³

2020

GEP

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“…An extensive temporal sampling effort by Sukumaran et al (2016) demonstrated the impact of tropical cyclone Phyan on the polychaete community of the Malvan MPA, followed by a complete recovery. Rengaiyan et al (2017) carried out a study in the coastal waters of the south-eastern Arabian Sea, including Ratnagiri and Mumbai transects from the NWI coast. The study determined spatial variations in the polychaete assemblage that consisted of 16 families and 71 species, mainly governed by substrate composition.…”

Section: Extensive Ecological Surveysmentioning

confidence: 99%

Marine Macrobenthos of NorthWest India-Reviewing the Known and Unknown

et al. 2021

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Tropical ecosystems sustain higher biodiversity and face faster species extinction. However, baseline information of these areas is either inadequate or scattered due to various reasons. The 2,360 km long coast of North West India (NWI), is a heavily industrialized and urbanized zone. This coast with unique biogeographical and climatic features with two notified marine protected areas also supports rich biodiversity. This review was motivated by a need to construct a synoptic view on marine benthic ecology and functioning by consolidating available information of macrobenthos. Two thousand seventy-eight macrobenthic taxa belonging to 14 phyla were compiled from 147 references and were composed mostly by Polychaeta (n = 617), Gastropoda (n = 602), and Bivalvia (n = 216). Habitat wise, intertidal and subtidal zones were more intensely studied and contributed most to the diversity records. Sediment texture and salinity were the major drivers of macrobenthic community structure in the subtidal areas and estuaries, respectively. In the intertidal zones, zonation patterns related to the tidal levels and time of exposure were distinct with the high water zones being sparsely populated and lower intertidal zones sustaining higher species and functional diversities. All zones of NWI coast were distinctly impacted to various extent by anthropogenic activities affecting the resident macrobenthos. Decline in species richness and species substitution due to pollution were reported in urbanized zones. Non-monsoonal months favored a more conducive environment for the macrobenthic diversity and functionality. Hypoxia tolerant polychaete species mainly belonging to Spionidae and Cossuridae dominated during the low oxygen conditions of upwelling and OMZ zones of NWI. Inadequate identification and inconsistency of sampling methods were major deterrents for concluding trends of distributions. Suggestions for future macrobenthic research include focusing on lesser studied groups and areas, seasonal as well anthropogenic hypoxic zones and well planned long-term monitoring studies. Major data lacunae were identified in the taxonomy, molecular, functional aspects, and bioinvasive studies of macrobenthos in this geographical zone despite clear evidence of high diversity of extant macrofauna. This compendium should help prioritize research areas and objectives aimed at enhancing our understanding of macrobenthos and improve predictive capabilities of community shifts that may occur due to global climate change scenarios.

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Moving beyond traditional macrofaunal community structure studies in the Indian Ocean continental shelf: a research synthesis based on research weaving

Sivadas

Patil

2023

Environ Sci Pollut Res

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Polychaete assemblage driven by substrate composition along the coastal waters of the South-eastern Arabian Sea

Cited by 5 publications

References 20 publications

Assessment of Sediment and Benthic Macrofauna Distribution at Dar es Salaam Harbour Channel

Assessment of Sediment and Benthic Macrofauna Distribution at Dar es Salaam Harbour Channel

Marine Macrobenthos of NorthWest India-Reviewing the Known and Unknown

Moving beyond traditional macrofaunal community structure studies in the Indian Ocean continental shelf: a research synthesis based on research weaving

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