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Tang Q, Shingate P, Wardiatno Y, John A, Tay BH, Tay YC, Yap L, Lim J, Tong HY, Tun K, Venkatesh B, Rheindt FE. The different fates of two Asian horseshoe crab species with different dispersal abilities. Evol Appl 2021; 14:2124-2133. [PMID: 34429753 PMCID: PMC8372080 DOI: 10.1111/eva.13271] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Revised: 06/12/2021] [Accepted: 06/18/2021] [Indexed: 11/28/2022] Open
Abstract
Impending anthropogenic climate change will severely impact coastal organisms at unprecedented speed. Knowledge on organisms' evolutionary responses to past sea-level fluctuations and estimation of their evolutionary potential is therefore indispensable in efforts to mitigate the effects of future climate change. We sampled tens of thousands of genomic markers of ~300 individuals in two of the four extant horseshoe crab species across the complex archipelagic Singapore Straits. Carcinoscorpius rotundicauda Latreille, a less mobile mangrove species, has finer population structure and lower genetic diversity compared with the dispersive deep-sea Tachypleus gigas Müller. Even though the source populations of both species during the last glacial maximum exhibited comparable effective population sizes, the less dispersive C. rotundicauda seems to lose genetic diversity much more quickly because of population fragmentation. Contra previous studies' results, we predict that the more commonly sighted C. rotundicauda faces a more uncertain conservation plight, with a continuing loss in evolutionary potential and higher vulnerability to future climate change. Our study provides important genomic baseline data for the redirection of conservation measures in the face of climate change and can be used as a blueprint for assessment and mitigation of the adverse effects of impending sea-level rise in other systems.
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Affiliation(s)
- Qian Tang
- Department of Biological SciencesNational University of SingaporeSingapore CitySingapore
| | - Prashant Shingate
- Institute of Molecular and Cell BiologyA*STARBiopolisSingapore CitySingapore
| | | | - Akbar John
- Institute of Oceanography and Maritime Studies (INOCEM)Kulliyyah of ScienceInternational Islamic University Malaysia (IIUM)KuantanPahangMalaysia
| | - Boon Hui Tay
- Institute of Molecular and Cell BiologyA*STARBiopolisSingapore CitySingapore
| | | | - Laura‐Marie Yap
- School of Applied SciencesRepublic PolytechnicSingapore CitySingapore
| | - Jasmin Lim
- School of Applied SciencesRepublic PolytechnicSingapore CitySingapore
| | | | | | - Byrappa Venkatesh
- Institute of Molecular and Cell BiologyA*STARBiopolisSingapore CitySingapore
| | - Frank E. Rheindt
- Department of Biological SciencesNational University of SingaporeSingapore CitySingapore
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Manca A, Mohamad F, Ahmad A, Afham Mohd Sofa MF, Ismail N. Tri-spine horseshoe crab, Tachypleus tridentatus (L.) in Sabah, Malaysia: the adult body sizes and population estimate. JOURNAL OF ASIA-PACIFIC BIODIVERSITY 2017. [DOI: 10.1016/j.japb.2017.04.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Nelson BR, Satyanarayana B, Moh JHZ, Ikhwanuddin M, Chatterji A, Shaharom F. The final spawning ground of Tachypleus gigas (Müller, 1785) on the east Peninsular Malaysia is at risk: a call for action. PeerJ 2016; 4:e2232. [PMID: 27547542 PMCID: PMC4957986 DOI: 10.7717/peerj.2232] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Accepted: 06/17/2016] [Indexed: 11/20/2022] Open
Abstract
Tanjung Selongor and Pantai Balok (State Pahang) are the only two places known for spawning activity of the Malaysian horseshoe crab - Tachypleus gigas (Müller, 1785) on the east coast of Peninsular Malaysia. While the former beach has been disturbed by several anthropogenic activities that ultimately brought an end to the spawning activity of T. gigas, the status of the latter remains uncertain. In the present study, the spawning behavior of T. gigas at Pantai Balok (Sites I-III) was observed over a period of thirty six months, in three phases, between 2009 and 2013. Every year, the crab’s nesting activity was found to be high during Southwest monsoon (May–September) followed by Northeast (November–March) and Inter monsoon (April and October) periods. In the meantime, the number of female T. gigas in 2009–2010 (Phase-1) was higher (38 crabs) than in 2010–2011 (Phase-2: 7 crabs) and 2012–2013 (Phase-3: 9 crabs) for which both increased overexploitation (for edible and fishmeal preparations) as well as anthropogenic disturbances in the vicinity (sand mining since 2009, land reclamation for wave breaker/parking lot constructions in 2011 and fishing jetty construction in 2013) are responsible. In this context, the physical infrastructure developments have altered the sediment close to nesting sites to be dominated by fine sand (2.5Xφ ) with moderately-well sorted (0.6–0.7σφ), very-coarse skewed (−2.4SKφ), and extremely leptokurtic (12.6Kφ) properties. Also, increased concentrations of Cadmium (from 4.2 to 13.6 mg kg−1) and Selenium (from 11.5 to 23.3 mg kg−1) in the sediment, and Sulphide (from 21 to 28 µg l−1) in the water were observed. In relation to the monsoonal changes affecting sheltered beach topography and sediment flux, the spawning crabs have shown a seasonal nest shifting behaviour in-between Sites I-III during 2009–2011. However, in 2012–2013, the crabs were mostly restricted to the areas (i.e., Sites I and II) with high oxygen (5.5–8.0 mg l−1) and moisture depth (6.2–10.2 cm). In view of the sustained anthropogenic pressure on the coastal habitats on one hand and decreasing horseshoe crabs population on the other, it is crucial to implement both conservation and management measures for T. gigas at Pantai Balok. Failing that may lead to the loss of this final spawning ground on the east coast of P. Malaysia.
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Affiliation(s)
- Bryan Raveen Nelson
- Institute of Tropical Aquaculture (AKUATROP), Universiti Malaysia Terengganu-UMT, Kuala Terengganu, Terengganu, Malaysia.,Horseshoe Crab Research Group (HCRG), Universiti Malaysia Terengganu-UMT, Kuala Terengganu, Terengganu, Malaysia
| | - Behara Satyanarayana
- Mangrove Research Unit (MARU), Universiti Malaysia Terengganu-UMT, Institute of Oceanography and Environment (INOS), Kuala Terengganu, Malaysia.,Laboratory of Systems Ecology and Resource Management, Université Libre de Bruxelles-ULB, Brussels, Belgium.,Laboratory of Plant Biology and Nature Management, Vrije Universiteit Brussel-VUB, Brussels, Belgium
| | - Julia Hwei Zhong Moh
- Institute of Tropical Aquaculture (AKUATROP), Universiti Malaysia Terengganu-UMT, Kuala Terengganu, Terengganu, Malaysia
| | - Mhd Ikhwanuddin
- Institute of Tropical Aquaculture (AKUATROP), Universiti Malaysia Terengganu-UMT, Kuala Terengganu, Terengganu, Malaysia
| | - Anil Chatterji
- Biological Oceanography Division, National Institute of Oceanography (NIO), Goa, India
| | - Faizah Shaharom
- Institute of Kenyir Research (IPK), Universiti Malaysia Terengganu-UMT, Kuala Terengganu, Terengganu, Malaysia
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