Horseshoe Crabs, Their Eco-biological Status Along the Northeast Coast of India and the Necessity for Ecological Conservation

Mishra, Jayant Kumar

doi:10.1007/978-0-387-89959-6_5

Cited by 31 publications

(27 citation statements)

References 8 publications

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“…has seen 2 live adult Tachypleus gigas in a catch of Carcinoscorpius rotundicauda at Lim Chu Kang, which is a typical C. ro tun dicauda site, and a dead T. gigas in a net at the Mandai mudflats. Although un common, such co-existence has also been reported from the east coast of India, where T. gigas was more numerous in con ditions of high salinity but as the salinity decreased at the site, C. ro tun dicauda became more numerous (Chatterji 1999, Mishra 2009). Co-existence may occur in the Strait of Johor, an estuary where salinities also vary during the year depending upon the state of the tide, weather and terrestrial runoff.…”

Section: Co-existence Of Both Speciesmentioning

confidence: 81%

“…The Asian horseshoe crab T. tridentatus and the coastal horseshoe crab T. gigas live in sandy to muddy habitats (Chatterji & Abidi 1993, Davidson et al 2008) while the mangrove horseshoe crab C. rotundicauda inhabits muddy areas, commonly in brackish waters (Chatterji & Abidi 1993, Ng & Sivasothi 2002, Davidson et al 2008. In India, some T. gigas co-exist with C. ro tun dicauda (Chatterji 1999, Mishra 2009). Unlike the other 3 species, C. rotun dicauda does not move out to sea with the receding tide.…”

Section: Introductionmentioning

confidence: 99%

“…Habitats throughout Asia are diminishing, and evidence from studies and local fishermen suggests that all species, once commonly found, are in decline. For example, in India, spawning activity has been adversely affected by the degradation and destruction of spawning beaches of both Carcinoscorpius rotundicauda and Tachypleus gigas (Mishra 2009). In Hong Kong, juvenile densities have been declining for some years (Morton 1999, Chiu & Morton 2003, and juveniles are found in fewer locations ).…”

Section: Introductionmentioning

confidence: 99%

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Distribution and abundance of horseshoe crabs Tachypleus gigas and Carcinoscorpius rotundicauda around the main island of Singapore

Cartwright-Taylor¹,

Yap²,

Hsu³

et al. 2011

Aquat. Biol.

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A survey and interviews with fishermen to determine the current spatial distribution of coastal Tachypleus gigas and mangrove Carcinoscorpius rotundicauda horseshoe crabs on the main island of Singapore indicated that there are probably no sites that support a breeding population of T. gigas. The only adult T. gigas seen were trapped in nets at 1 site, no juveniles or sub-adults were found at any site, and fishermen see this species infrequently. C. rotundicauda were more abundant, and breeding populations were found on the mudflats, fringed with mangroves. These small areas may be the last sites that support a breeding population of C. rotundicauda. Population density studies of mainly surface crabs on the mudflats at 1 site gave a conservative figure of 0.5 crabs m -2 using non-randomised, longitudinal belt-transects of 5 × 50 m, set from high-to low-tide zones. Smaller randomised quadrats, searched for both buried and surface crabs, gave densities of 0.57 to 0.98 individuals m -2 , equivalent to a possible abundance ranging from 29 925 to 51 450 individuals in the accessible search area of 52 500 m 2 . Comparisons over different months suggest that density changed little over time. Randomised quadrats and searches to depletion gave higher density figures, but they are labour intensive and difficult to set up in the terrain. Randomised, longitudinal belt-transects of 5 × 50 m are recommended for long-term monitoring of crab density. These findings provide baseline data to monitor the population at the site and to formulate conservation strategies for the 2 crab species.

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Section: Co-existence Of Both Speciesmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distribution and abundance of horseshoe crabs Tachypleus gigas and Carcinoscorpius rotundicauda around the main island of Singapore

Cartwright-Taylor¹,

Yap²,

Hsu³

et al. 2011

Aquat. Biol.

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“…The global distribution of all species of horseshoe crab has been well described by Mikkelsen (1988), but his book was based on work carried out before the late 1980s. Since then, land reclamation and coastal development or degradation have destroyed much of the habitat of horseshoe crabs (Savage 2001, Ng & Sivasothi 2002, Mishra 2009). Moreover, the biology, ecology and breeding patterns of C. rotundicauda have not been as well documented as those of the North American species Limulus polyphemus (Linnaeus, 1758).…”

Section: Introductionmentioning

confidence: 99%

Population structure and breeding pattern of the mangrove horseshoe crab Carcinoscorpius rotundicauda in Singapore

Cartwright-Taylor¹,

Lee²,

Hsu³

2009

Aquat. Biol.

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“…Akar masalah berupa ketersediaan makanan dan faktor lingkungan (Chatterji et al, 2000;Zadeh et al, 2011) dan kerusakan habitat, kelebihan tangkap dan pencemaran (Mishra, 2009).…”

Section: Pendahuluanunclassified

POPULATION STRUCTURE AND MORPHOMETRY OF HORSESHOE CRAB Carcinoscorpius rotundicauda, Latreille 1802 IN KAMPUNG GISI COASTAL AREA OF BINTAN BAY OF RIAU ISLANDS PROVINCE

Anggraini

Bengen

Natih

2017

J. Ilmu dan Teknologi Kelautan Tropis

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Horseshoe crab, Carcinoscorpius rotundicauda is frequently found in the coastal zone of Bintan Bay of Riau Islands Province. The study was conducted from August to September 2016 in coastal area of Kampung Gisi, Bintan bay. The aims of the study were to analyse the population structure and morphometric characters of horseshoe crab and its relation to the coastal environmental characteristics. Sampling of horseshoe crab was taken using belt transect method, and coastal environmental parameters were measured in-situ. The results show that b values of length-weight relationship were found to be 3.3 (male) and 2.6 (female) respectively. Furthermore, the growth pattern of males were positive allometric, and females were negative allometric. Horseshoe crab are closely related to sandy mudflats sediment, brackish water salinity and mangrove habitat distribution. Keywords: horseshoe crab, population structure, morphometry, environmental characteristics, Bintan Bay

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Horseshoe Crabs, Their Eco-biological Status Along the Northeast Coast of India and the Necessity for Ecological Conservation

Cited by 31 publications

References 8 publications

Distribution and abundance of horseshoe crabs Tachypleus gigas and Carcinoscorpius rotundicauda around the main island of Singapore

Distribution and abundance of horseshoe crabs Tachypleus gigas and Carcinoscorpius rotundicauda around the main island of Singapore

Population structure and breeding pattern of the mangrove horseshoe crab Carcinoscorpius rotundicauda in Singapore

POPULATION STRUCTURE AND MORPHOMETRY OF HORSESHOE CRAB Carcinoscorpius rotundicauda, Latreille 1802 IN KAMPUNG GISI COASTAL AREA OF BINTAN BAY OF RIAU ISLANDS PROVINCE

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