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Dang HTT, Utama IV, Nagano AJ, Kobayashi H, Maeda K, Hoang HD, Tran HD, Yamahira K. Distribution and Population Genetic Structure of the Hau Giang Medaka, Oryzias haugiangensis, Along the East Coast of the Indochinese Peninsula. Zoolog Sci 2024; 41:251-256. [PMID: 38809863 DOI: 10.2108/zs230121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Accepted: 01/06/2024] [Indexed: 05/31/2024]
Abstract
The east coast of the Indochinese Peninsula is a well-known transition zone from subtropical to tropical systems, yet only a small number of studies have been conducted on the biogeography and phylogeography of aquatic organisms in this region. The Hau Giang medaka, Oryzias haugiangensis, was originally described from the Mekong Delta in southern Vietnam, and later reported also from southeastern Thailand, west of the Mekong Delta region. However, the species' full geographic range and population genetic structures remain unknown. Field surveys showed a widespread distribution of this species along the east coast of the Indochinese Peninsula, as far as northern Vietnam. A mitochondrial gene phylogeny and population genetic structure analysis using genome-wide single nucleotide polymorphisms revealed that the populations of O. haugiangensis are highly structuralized along the east coast of Vietnam, with the southernmost Mekong Delta population clearly separated from three populations north of central Vietnam. Further field collections are necessary to determine the boundary between the southern and northern populations, and the presence or absence of a hybrid zone.
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Affiliation(s)
- Huong T T Dang
- Faculty of Biology, Hanoi National University of Education, Hanoi 100000, Vietnam
| | - Ilham V Utama
- Tropical Biosphere Research Center, University of the Ryukyus, Okinawa 903-0213, Japan
- Museum Zoologicum Bogoriense, Research Center for Biosystematics and Evolution, National Research and Innovation Agency, Cibinong 16911, Indonesia
| | - Atsushi J Nagano
- Faculty of Agriculture, Ryukoku University, Otsu 520-2194, Japan
- Institute for Advanced Biosciences, Keio University, Tsuruoka 997-0017, Japan
| | - Hirozumi Kobayashi
- Department of Zoology, National Museum of Nature and Science, Tsukuba 305-0005, Japan
| | - Ken Maeda
- Okinawa Institute of Science and Technology Graduate University, Okinawa 904-0495, Japan
| | - Huy D Hoang
- Department of Ecology and Evolutionary Biology, University of Science, Ho Chi Minh City 700000, Vietnam
- Vietnam National University, Ho Chi Minh City 700000, Vietnam
| | - Hau D Tran
- Faculty of Biology, Hanoi National University of Education, Hanoi 100000, Vietnam
| | - Kazunori Yamahira
- Tropical Biosphere Research Center, University of the Ryukyus, Okinawa 903-0213, Japan,
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2
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Klementz BC, Sharma PP. New species of Paktongius and convergent evolution of the gonyleptoid-like habitus in Southeast Asian Assamiidae (Opiliones: Laniatores). Zootaxa 2023; 5389:34-54. [PMID: 38221042 DOI: 10.11646/zootaxa.5389.1.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Indexed: 01/16/2024]
Abstract
The armored harvestman family Assamiidae (Arachnida: Opiliones: Laniatores) is widely distributed throughout the Old World tropics, specifically throughout tropical Asia and Central Africa. However, the systematics and intrafamilial relationships of the group remain poorly understood. This can be largely attributed to the complicated taxonomic history of the group, which is exemplified by poorly supported subfamily classifications and the prevalence of monotypic genera. Here, we describe four new species of the formerly monotypic genus Paktongius Suzuki, 1969, using specimens collected from Laos, Thailand, and West Malaysia, suggesting a degree of microendemism within the group, which underscores the need for greater sampling of the southeast Asian arachnofauna. Recent phylogenetic analysis has also suggested that Mysorea thaiensis Suzuki, 1985 nests within a clade composed of Paktongius distinctus Suzuki, 1969 and the species described herein (P. suzukii sp. nov., P. spiculosus sp. nov., P. paritensis sp. nov., P. furculus sp. nov.). We therefore transfer Mysorea thaiensis to Paktongius (P. thaiensis comb. nov.). We also comment on the unique morphology of this highly derived group of harvestmen, which appears to suggest convergent evolution of the gonyleptoid-like morphology, complete with the characteristic exaggerated leg four coxae and laterally expanded scutum.
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Affiliation(s)
- Benjamin C Klementz
- Department of Integrative Biology; University of Wisconsin-Madison; Madison; WI; USA 53706.
| | - Prashant P Sharma
- Department of Integrative Biology; University of Wisconsin-Madison; Madison; WI; USA 53706.
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3
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Evolutionary differentiation of androgen receptor is responsible for sexual characteristic development in a teleost fish. Nat Commun 2023; 14:1428. [PMID: 36918573 PMCID: PMC10014959 DOI: 10.1038/s41467-023-37026-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 02/28/2023] [Indexed: 03/16/2023] Open
Abstract
Teleost fishes exhibit complex sexual characteristics in response to androgens, such as fin enlargement and courtship display. However, the molecular mechanisms underlying their evolutionary acquisition remain largely unknown. To address this question, we analyse medaka (Oryzias latipes) mutants deficient in teleost-specific androgen receptor ohnologs (ara and arb). We discovered that neither ar ohnolog was required for spermatogenesis, whilst they appear to be functionally redundant for the courtship display in males. However, both were required for reproductive success: ara for tooth enlargement and the reproductive behaviour eliciting female receptivity, arb for male-specific fin morphogenesis and sexual motivation. We further showed that differences between the two ar ohnologs in their transcription, cellular localisation of their encoded proteins, and their downstream genetic programmes could be responsible for the phenotypic diversity between the ara and arb mutants. These findings suggest that the ar ohnologs have diverged in two ways: first, through the loss of their roles in spermatogenesis and second, through gene duplication followed by functional differentiation that has likely resolved the pleiotropic roles derived from their ancestral gene. Thus, our results provide insights into how genome duplication impacts the massive diversification of sexual characteristics in the teleost lineage.
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Ansai S, Montenegro J, Masengi KWA, Nagano AJ, Yamahira K, Kitano J. Diversity of sex chromosomes in Sulawesian medaka fishes. J Evol Biol 2022; 35:1751-1764. [DOI: 10.1111/jeb.14076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 05/30/2022] [Accepted: 07/14/2022] [Indexed: 12/16/2022]
Affiliation(s)
- Satoshi Ansai
- Graduate School of Life Sciences Tohoku University Sendai Japan
| | - Javier Montenegro
- Tropical Biosphere Research Center University of the Ryukyus Nishihara Japan
| | | | - Atsushi J. Nagano
- Faculty of Agriculture Ryukoku University Otsu Japan
- Institute for Advanced Biosciences Keio University Tsuruoka Japan
| | - Kazunori Yamahira
- Tropical Biosphere Research Center University of the Ryukyus Nishihara Japan
| | - Jun Kitano
- Ecological Genetics Laboratory National Institute of Genetics Shizuoka Japan
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Yu T, Green DM, Deng Y, Han Y. Effects of operational sex ratio and male density on size-dependent mating in Minshan’s toads, Bufo minshanicus, on the Tibetan Plateau of China. Biol J Linn Soc Lond 2022. [DOI: 10.1093/biolinnean/blac067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
In many animal species, an increase in the operational sex ratio (OSR), density or a combination of both should lead to more intensive competition among individuals of the more abundant sex. To test this, we examined pairing patterns of Minshan’s toad (Bufo minshanicus) from six populations between 2008 and 2015 along the eastern Tibetan Plateau in south-west China. OSRs in breeding aggregations of Minshan’s toad are normally male biased and males actively compete with each other for acquisition and retention of mates. We found evidence that deviations from random mating by size varied between populations and between years according to the magnitude of the OSR and male density. Larger males were generally more successful in pairing than smaller males when the OSR was slightly male biased and male density was high. However, the resulting size-disproportionate mating was more evident when OSR was closer to 1.99, indicating a positive correlation with the intensity of aggressive scramble competition. Thus, the intensity of male-male competition may partly explain variation in size-disproportionate mating among populations.
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Affiliation(s)
- Tonglei Yu
- Department of Biology, College of Life Science, Xinyang Normal University , SD 464000 , China
| | - David M Green
- Redpath Museum, McGill University , Montreal, Quebec H3A 0C4 , Canada
| | - Yaohui Deng
- Department of Biology, College of Life Science, Xinyang Normal University , SD 464000 , China
| | - Yanting Han
- Department of Biology, College of Life Science, Xinyang Normal University , SD 464000 , China
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Murray CM, McMahan CD, Litmer AR, Goessling JM, Siegel D. Latitudinal gradients in sexual dimorphism: Alternative hypotheses for variation in male traits. Ecol Evol 2021; 11:17519-17526. [PMID: 34938526 PMCID: PMC8668724 DOI: 10.1002/ece3.8386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/25/2021] [Accepted: 11/02/2021] [Indexed: 11/19/2022] Open
Abstract
Biological patterns across latitudinal gradients elucidate a number of striking natural clines from which numerous processes can be further explored. The trade-off between reproduction and somatic maintenance and growth represents a suite of life-history traits with variable energy allocation and potential latitudinal patterns. Specifically, male sexually dimorphic traits in female choice systems represent one such reproductive investment constrained by resource acquisition and subsequent allocation. Latitudinal variation in sexual dimorphism has been suggested although the relationship between dimorphic traits and latitude are conflicting. Here, we test alternative hypotheses regarding this pattern using two broadly distributed vertebrates exhibiting sexually dimorphic traits. We hypothesized that the exaggeration of dimorphic traits correlates with latitude, with males having exaggerated sexually dimorphic traits at either higher or lower latitudes. Results indicate that male sexually dimorphic traits are exaggerated at lower latitudes while relative gonopodium size in Poecilia latipinna was larger at higher latitudes. This pattern may be a result of lower latitude populations experiencing greater population densities and longer access to resources that could manifest in females more intensively selecting for higher quality males in lower latitudes. Experimental work should address this pattern and investigate mechanistic processes.
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Affiliation(s)
- Christopher M. Murray
- Department of Biological SciencesSoutheastern Louisiana UniversityHammondLouisinaUSA
| | | | | | | | - Dustin Siegel
- Department of BiologySoutheast Missouri State UniversityCape GirardeauMissouriUSA
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Dursun C, Gül S, Özdemir N. Sexual size and shape dimorphism in Turkish common toads (Bufo bufo Linnaeus 1758). Anat Rec (Hoboken) 2021; 305:1548-1558. [PMID: 34626158 DOI: 10.1002/ar.24801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 09/12/2021] [Accepted: 09/13/2021] [Indexed: 11/09/2022]
Abstract
Differences in male and female traits (sexual dimorphism [SD]) are widespread in animals. Dimorphism in morphological characters evolves under the effect of environmental and genetic factors and is shaped by natural and sexual selection. In this study, intersexual differences in size and shape in common toad, Bufo bufo, populations in Turkey were investigated. For this, linear measurements of 27 body-related morphometric characters in a sample of 140 individuals (70 males and 70 females) were compiled. The data were analyzed using univariate and multivariate statistical methods. The results show SD in body size with females having larger body size, a trait related with fecundity and thus probably under sexual selection. Body shape differences, which are associated with head width and dorsal head, are likely to prey size. Male-biased differences observed in nasal characters and tympanum may also be associated with sexual selection (male-male competition). Our findings are consistent with previous studies of major of Anura and support a role for selection pressures acting differentially upon individuals from both sexes, resulting in the evolution of sexually dimorphic traits.
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Affiliation(s)
- Cantekin Dursun
- Department of Biology, Faculty of Arts and Sciences, Recep Tayyip Erdogan University, Rize, Turkey
| | - Serkan Gül
- Department of Biology, Faculty of Arts and Sciences, Recep Tayyip Erdogan University, Rize, Turkey
| | - Nurhayat Özdemir
- Department of Biology, Faculty of Arts and Sciences, Recep Tayyip Erdogan University, Rize, Turkey
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