Tri-spine horseshoe crab, Tachypleus tridentatus (L.) in Sabah, Malaysia: the adult body sizes and population estimate

Manca, Azwarfarid; Mohamad, Faridah; Ahmad, Amirrudin; Sofa, Muhd Fawwaz Afham Mohd; Ismail, Normaz Wana

doi:10.1016/j.japb.2017.04.011

Cited by 19 publications

(13 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Horseshoe crabs (HSCs) are important species in selected marine ecosystems, being the source of protein for other marine species and contributing as bioturbators to the rearrangement and aeration of marine sediments. HSCs also have an important role in the biomedical and pharmaceutical industries, and an important subject of research from the biological, evolutionary, and ecological standpoints (Manca et al 2017 ; Krisfalusi-Gannon et al 2018 ). A combination of factors such as environmental changes and uncontrolled economical exploitation threaten the survival of HSCs which encourages the genetic research on these species to better understand their mechanisms of adaptation, genetic diversity, and immune defensive system.…”

Section: Introductionmentioning

confidence: 99%

Mitochondrial DNA sequence of the horseshoe crabTachypleus gigas

Sarmiento

Chin

Lau

et al. 2021

Mitochondrial DNA Part B

Self Cite

View full text Add to dashboard Cite

This paper reports on the complete mitochondrial (mt) genome of a horseshoe crab, Tachypleus gigas (T. gigas), in Kuala Kemaman, Terengganu, Malaysia. Whole-genome sequencing of hemocyte DNA was performed with Illumina HiSeq system and the generated reads were de novo assembled with ABySS 2.1.5 and reassembled using mitoZ against Carcinoscorpius rotundicauda and Limulus polyphemus, resulting in a contig of 15 Kb. Phylogenetic analysis of the assembled mt genome suggests that the Tachypleus gigas is closely related to Tachypleus tridentatus than to Carcinoscorpius rotundicauda.

show abstract

Section: Introductionmentioning

confidence: 99%

Mitochondrial DNA sequence of the horseshoe crabTachypleus gigas

Sarmiento

Chin

Lau

et al. 2021

Mitochondrial DNA Part B

Self Cite

View full text Add to dashboard Cite

show abstract

“…Once key breeding sites have been identified, then quantitative surveys can be designed. The tri-spine horseshoe crab, T. tridentatus, and coastal horseshoe crab, T. gigas, spawn on sandy beach habitats similar to those used by American horseshoe crabs (Mishra, 2009;Behera et al, 2015;Hsieh & Chen, 2015;Mishra, Mishra & Yasmin, 2015;Mohamad et al, 2015;Nelson et al, 2015;Manca et al, 2017), so some modifications of the spawning and egg surveys may be feasible for researchers of these two species, especially in the less disturbed portions of the coast. However, we recognize that survey methods may need to be modified in areas affected by anthropogenic changes to the shoreline, such as the construction of sea walls or shrimp ponds, mangrove losses, and so on.…”

Section: Discussionmentioning

confidence: 99%

“…Populations of coastal and mangrove horseshoe crabs are widely regarded as declining, due to many of the same factors noted above (e.g. Mishra, 2009; Shin, Li & Cheung, 2009; Behera et al, 2015; Cartwright‐Taylor, 2015; Faridah et al, 2015; Mishra, Mishra & Yasmin, 2015; Nelson et al, 2015; Manca et al, 2017). Global climate change is an overarching threat to horseshoe crabs in both North America and Asia, because of the loss of intertidal spawning and juvenile nursery habitats associated with sea‐level rise, and the detrimental effects of shoreline armouring (Botton, 2001; Jackson & Nordstrom, 2015; Loveland & Botton, 2015).…”

Section: Introductionmentioning

confidence: 99%

The relationships between spawning horseshoe crabs and egg densities: Recommendations for the assessment of populations and habitat suitability

Botton

Colon

Sclafani

et al. 2021

Aquatic Conservation

View full text Add to dashboard Cite

1. Horseshoe crab population sizes and trends have been previously studied using surveys of spawning adults and counts of eggs from surface (top 5 cm) and deep (20 cm) sediment samples. The correlations between surface and deep eggs were studied at two locations, Delaware Bay and Jamaica Bay, USA, and the correlations between egg densities and spawning counts were examined in Jamaica Bay.2. There were significantly higher densities of eggs in deep sediments than in surface sediments. Only about 10% of the variability in surface egg density was explained by deep egg density. The numerical patterns between surface and deep eggs were similar between Delaware Bay and Jamaica Bay and across sampling dates.3. Nearly 20% of the deep samples in the combined data from Delaware Bay and Jamaica Bay with an egg density of ≥100,000 m −2 had zero surface eggs.Therefore, the use of surface eggs as an indicator of habitat suitability and spawning intensity may seriously underestimate the importance of a beach for spawning horseshoe crabs. 4. When paired with nearest survey date, Jamaica Bay spawning indices did not predict deep or surface egg densities. This may be related to a temporal mismatch between survey methods, the extreme overdispersion (patchiness) of the eggs, and/or the dynamics of egg distribution after exhumation. 5. Both egg density and spawning surveys can provide useful data on habitat suitability for horseshoe crabs and can offer excellent opportunities for student and citizen scientist engagement. More labour is required for egg surveys than spawning surveys because of the time required to sample, sort, and enumerate the eggs.

show abstract

“…Whereas C. rotundicauda and T. gigas are found in Peninsular Malaysia, the distribution of T. tridentatus is restricted to Sabah and Sarawak in East Malaysia (Akbar John et al, 2018). The horseshoe crabs of Malaysia have received serious scientific attention only recently, however (Zaleha et al, 2010;Srijaya et al, 2014;Manca et al, 2017). Therefore, the current population size and spawning counts of these horseshoe crabs are uncertain and good baseline data are lacking from several locations in Peninsular Malaysia.…”

Section: Introductionmentioning

confidence: 99%

Mangrove horseshoe crab (Carcinoscorpius rotundicaudaLatreille, 1802) populations reveal genetic break in Strait of Malacca, with connectivity along southern coasts of Peninsular Malaysia

Fairuz-Fozi

Triest

Zauki

et al. 2021

Aquatic Conservation

View full text Add to dashboard Cite

1. The mangrove horseshoe crab, Carcinoscorpius rotundicauda, has divergent populations between the east and west coasts of Peninsular Malaysia, with the southern coast acting as a land barrier. The actual position of such a genetic break along Peninsular Malaysia as well as the connectivity status of the southernmost C. rotundicauda populations with east and west coast populations remain unexplored, however. 2. The aim was to investigate the genetic diversity and structure of C. rotundicauda populations from the west (Kuala Sepetang in State Perak), east (Balok in State Pahang), and southern (Pendas in State Johor) coasts of Peninsular Malaysia. Haemolymph samples from adult C. rotundicauda specimens (n = 152) and eggs from their freshly deposited nests (n = 190) were collected monthly (from January 2016 to January 2017) for the sequencing of mitochondrial cytochrome c oxidase subunit I (COI). 3. Gene isolates of C. rotundicauda from the present study were compared with National Center for Biotechnology Information (NCBI) GenBank sequences to cover most of the range of the species in Asia. A neighbour-joining tree strongly supported two clades, separating the west-coast populations from the south-and east-coast populations, with further substructure patterns. 4. Both haplotype network and barrier analyses revealed a genetic break within the Strait of Malacca instead of the southern tip of Peninsular Malaysia. The southernmost samples from the Strait of Johor formed a haplotypic diverse gene pool that appeared only as a subclade of the eastern populations. In a detailed Nur Fairuz-Fozi and Ludwig Triest are co-first authors. Behara Satyanarayana and Farid Dahdouh-Guebas are co-last authors.

show abstract

Tri-spine horseshoe crab, Tachypleus tridentatus (L.) in Sabah, Malaysia: the adult body sizes and population estimate

Cited by 19 publications

References 31 publications

Mitochondrial DNA sequence of the horseshoe crabTachypleus gigas

Mitochondrial DNA sequence of the horseshoe crabTachypleus gigas

The relationships between spawning horseshoe crabs and egg densities: Recommendations for the assessment of populations and habitat suitability

Mangrove horseshoe crab (Carcinoscorpius rotundicaudaLatreille, 1802) populations reveal genetic break in Strait of Malacca, with connectivity along southern coasts of Peninsular Malaysia

Contact Info

Product

Resources

About