Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp
There are four species of mud crabs within the genus Scylla, and most of them live sympatrically in the equatorial region. Apart from a report in Japan about the finding of a natural Scylla hybrid more than a decade ago after the division of genus Scylla into four species by Keenan, Davie & Mann...
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2020-01-01
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author | Hanafiah Fazhan Khor Waiho Emilia Quinitio Juliana C. Baylon Yushinta Fujaya Nita Rukminasari Mohammad Farhan Darin Azri Md. Sheriff Shahreza Hongyu Ma Mhd Ikhwanuddin |
author_facet | Hanafiah Fazhan Khor Waiho Emilia Quinitio Juliana C. Baylon Yushinta Fujaya Nita Rukminasari Mohammad Farhan Darin Azri Md. Sheriff Shahreza Hongyu Ma Mhd Ikhwanuddin |
author_sort | Hanafiah Fazhan |
collection | DOAJ |
description | There are four species of mud crabs within the genus Scylla, and most of them live sympatrically in the equatorial region. Apart from a report in Japan about the finding of a natural Scylla hybrid more than a decade ago after the division of genus Scylla into four species by Keenan, Davie & Mann (1998), no subsequent sighting was found. Thus, this study investigates the possible natural occurrence of potential hybridization among Scylla species in the wild. A total of 76,211 individuals from mud crab landing sites around the Malacca Straits, South China Sea and Sulu Sea were screened. In addition to the four-purebred species, four groups (SH 1, n = 2, 627; SH 2, n = 136; SH 3, n = 1; SH 4, n = 2) with intermediate characteristics were found, mostly at Sulu Sea. Discriminant Function Analysis revealed that all Scylla species, including SH 1 - 4, are distinguishable via their morphometric ratios. The most powerful discriminant ratios for each character and the top five discriminant ratios of males and females were suggested. The carapace width of SH 1 males and females were significantly smaller than pure species. Based on the discriminant ratios and the description of morphological characters, we hypothesize that the additional four groups of Scylla with intermediate characteristics could be presumed hybrids. Future work at the molecular level is urgently needed to validate this postulate. |
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language | English |
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publishDate | 2020-01-01 |
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spelling | doaj.art-be12575a64da4b7ab19ec543c02ab68d2023-12-03T09:55:29ZengPeerJ Inc.PeerJ2167-83592020-01-018e806610.7717/peerj.8066Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla sppHanafiah Fazhan0Khor Waiho1Emilia Quinitio2Juliana C. Baylon3Yushinta Fujaya4Nita Rukminasari5Mohammad Farhan Darin Azri6Md. Sheriff Shahreza7Hongyu Ma8Mhd Ikhwanuddin9Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, Guangdong, ChinaGuangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, Guangdong, ChinaAquaculture Department, Southeast Asian Fisheries Development Center, Iloilo, PhilippinesDivision of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, Ioilo, PhilippinesFaculty of Marine Science and Fishery, Hasanuddin University, Makassar, IndonesiaFaculty of Marine Science and Fishery, Hasanuddin University, Makassar, IndonesiaFaculty of Resource Science and Technology, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak, MalaysiaInstitute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, Kuala Terengganu, Terengganu, MalaysiaGuangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, Guangdong, ChinaSTU-UMT Joint Shellfish Research Laboratory, Shantou University, Shantou, Guangdong, ChinaThere are four species of mud crabs within the genus Scylla, and most of them live sympatrically in the equatorial region. Apart from a report in Japan about the finding of a natural Scylla hybrid more than a decade ago after the division of genus Scylla into four species by Keenan, Davie & Mann (1998), no subsequent sighting was found. Thus, this study investigates the possible natural occurrence of potential hybridization among Scylla species in the wild. A total of 76,211 individuals from mud crab landing sites around the Malacca Straits, South China Sea and Sulu Sea were screened. In addition to the four-purebred species, four groups (SH 1, n = 2, 627; SH 2, n = 136; SH 3, n = 1; SH 4, n = 2) with intermediate characteristics were found, mostly at Sulu Sea. Discriminant Function Analysis revealed that all Scylla species, including SH 1 - 4, are distinguishable via their morphometric ratios. The most powerful discriminant ratios for each character and the top five discriminant ratios of males and females were suggested. The carapace width of SH 1 males and females were significantly smaller than pure species. Based on the discriminant ratios and the description of morphological characters, we hypothesize that the additional four groups of Scylla with intermediate characteristics could be presumed hybrids. Future work at the molecular level is urgently needed to validate this postulate.https://peerj.com/articles/8066.pdfScyllaDiscriminant Function AnalysisMorphometricPresumed HybridsMud Crab |
spellingShingle | Hanafiah Fazhan Khor Waiho Emilia Quinitio Juliana C. Baylon Yushinta Fujaya Nita Rukminasari Mohammad Farhan Darin Azri Md. Sheriff Shahreza Hongyu Ma Mhd Ikhwanuddin Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp PeerJ Scylla Discriminant Function Analysis Morphometric Presumed Hybrids Mud Crab |
title | Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp |
title_full | Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp |
title_fullStr | Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp |
title_full_unstemmed | Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp |
title_short | Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp |
title_sort | morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of scylla spp |
topic | Scylla Discriminant Function Analysis Morphometric Presumed Hybrids Mud Crab |
url | https://peerj.com/articles/8066.pdf |
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