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Muller MM, Santana DJ, Costa HC, Ceron K. Geographic patterns of distribution and ecological niche of the snake-necked turtle genus Hydromedusa. PeerJ 2024; 12:e16712. [PMID: 38560463 PMCID: PMC10979749 DOI: 10.7717/peerj.16712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 12/01/2023] [Indexed: 04/04/2024] Open
Abstract
Biotic and abiotic factors play a crucial role in determining the distribution of species. These factors dictate the conditions that must be met for a species to thrive in a particular area. Sister species that present some degree of niche overlap can shed light on how they are distributed and coexist in their environment. This study aims to investigate the geographical distribution and ecological niche of the sister species of snake-necked turtles Hydromedusa maximiliani and H. tectifera. By analyzing their niche overlap, we aim to obtain a better understanding of how these two species coexist and which variables are determining their occurences. We applied species distribution modeling and compared the niches using the niche equivalence and similarity tests. Our findings show that the distribution of H. maximiliani is most influenced by temperature seasonality and isothermality, while H. tectifera is most affected by the temperature seasonality, precipitation of warmest quarter and mean diurnal range. In addition, our results suggest that the niche expressed by H. maximiliani retained ecological characteristics that can accurately predict the H. tectifera distribution, but the inverse is not true. In this sense, differences are not solely due to the geographic availability of environmental conditions but can reflect niche restrictions, such as competition.
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Affiliation(s)
- Márcia M.P. Muller
- Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista, São José do Rio Preto, São Paulo, Brazil
| | - Diego J. Santana
- Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul, Brazil
| | - Henrique C. Costa
- Departamento de Zoologia, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil
| | - Karoline Ceron
- Departamento de Biologia Animal, Universidade Estadual de Campinas, Campinas, São Paulo, Brazil
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Zhang X, Zhao J, Zhou C, Li W, Liu Y, Wei C, Wang Y, Hong X, Zhu X, Liu X. Assessing and Screening of Female Fertility in Artificially Bred Asian Yellow Pond Turtles ( Mauremys mutica) Based on Parentage Assignment. Animals (Basel) 2024; 14:479. [PMID: 38338122 PMCID: PMC10854808 DOI: 10.3390/ani14030479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 01/28/2024] [Accepted: 01/29/2024] [Indexed: 02/12/2024] Open
Abstract
The Asian yellow pond turtle (Mauremys mutica) is widely traded in China, and its artificial breeding has now become a major industry. However, the insufficient offspring supply and reproductive decline of farmed turtles make the wild turtles more vulnerable. The present study was mainly designed to quantify the fecundity of M. mutica and attempt to screen for good reproductive performance in females. The genetic variability of the population and its genetic structure were also analysed. The parent-offspring relationships of all offspring in four consecutive years were confirmed using sixteen microsatellite loci. The genetic variability between the parents and offspring was low, and offspring of different years also showed little variability. We summarised the reproductive results of all females and counted the annual number of offspring and the variation in the number of offspring. The females were then divided into three types (stable, undulating and levelling off) according to the continuity. We selected seven females with good reproductive ability, which provided 16.94% of the annual contributions, while there were two females that had no offspring in four years. We also analysed the possible reasons for this difference and the importance of carrying out a family survey. This research can provide the basis and materials for the creation of a good reproductive group and the study of the reproductive biology of turtles in M. mutica aquaculture.
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Affiliation(s)
- Xincheng Zhang
- Key Laboratory of Tropical and Subtropical Fishery Resources Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China; (X.Z.); (J.Z.); (C.Z.); (W.L.); (Y.L.); (C.W.); (Y.W.); (X.H.)
| | - Jian Zhao
- Key Laboratory of Tropical and Subtropical Fishery Resources Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China; (X.Z.); (J.Z.); (C.Z.); (W.L.); (Y.L.); (C.W.); (Y.W.); (X.H.)
| | - Chenyao Zhou
- Key Laboratory of Tropical and Subtropical Fishery Resources Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China; (X.Z.); (J.Z.); (C.Z.); (W.L.); (Y.L.); (C.W.); (Y.W.); (X.H.)
- School of Fishery, Zhejiang Ocean University, Zhoushan 316000, China
| | - Wei Li
- Key Laboratory of Tropical and Subtropical Fishery Resources Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China; (X.Z.); (J.Z.); (C.Z.); (W.L.); (Y.L.); (C.W.); (Y.W.); (X.H.)
| | - Yihui Liu
- Key Laboratory of Tropical and Subtropical Fishery Resources Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China; (X.Z.); (J.Z.); (C.Z.); (W.L.); (Y.L.); (C.W.); (Y.W.); (X.H.)
| | - Chengqing Wei
- Key Laboratory of Tropical and Subtropical Fishery Resources Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China; (X.Z.); (J.Z.); (C.Z.); (W.L.); (Y.L.); (C.W.); (Y.W.); (X.H.)
| | - Yakun Wang
- Key Laboratory of Tropical and Subtropical Fishery Resources Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China; (X.Z.); (J.Z.); (C.Z.); (W.L.); (Y.L.); (C.W.); (Y.W.); (X.H.)
| | - Xiaoyou Hong
- Key Laboratory of Tropical and Subtropical Fishery Resources Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China; (X.Z.); (J.Z.); (C.Z.); (W.L.); (Y.L.); (C.W.); (Y.W.); (X.H.)
| | - Xinping Zhu
- Key Laboratory of Tropical and Subtropical Fishery Resources Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China; (X.Z.); (J.Z.); (C.Z.); (W.L.); (Y.L.); (C.W.); (Y.W.); (X.H.)
| | - Xiaoli Liu
- Key Laboratory of Tropical and Subtropical Fishery Resources Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China; (X.Z.); (J.Z.); (C.Z.); (W.L.); (Y.L.); (C.W.); (Y.W.); (X.H.)
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Famelli S, Souza FL, Georges A, Bertoluci J. Movement patterns and activity of the Brazilian snake-necked turtle Hydromedusa maximiliani (Testudines: Chelidae) in southeastern Brazil. AMPHIBIA-REPTILIA 2016. [DOI: 10.1163/15685381-00003047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
To investigate the movement patterns and activity ofHydromedusa maximilianiin southeastern Brazil, sixteen adult freshwater turtles (eight males and eight females) were monitored with radio-transmitters from October 2009 to November 2010. An additional 22 turtles (11 males and 11 females) were monitored with thread-bobbins over a 3-day period.Hydromedusa maximilianishowed strong tendency to remain close to the river course. The distance moved each day varied from 0 to 179 m/day (radio-tracking) and 1.5 to 201 m/day (thread-bobbins). Males moved greater distances than females during the mating season (August to November), while females exhibited pronounced movements associated with egg-laying (December to February). Male and female movements did not differ significantly. Straight line distance measurements, usually obtained by radio-tracking, underestimate actual movement distances, since the nonlinearity of movements is not captured by radio-tracking as opposed to spool tracking, even when long distances are travelled. Results from this study are important for establishing conservation strategies for this vulnerable species.
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Affiliation(s)
- Shirley Famelli
- Departamento de Ciências Biológicas, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Av. Pádua Dias 11, 13418-900 Piracicaba, São Paulo, Brazil
- Institute for Applied Ecology, University of Canberra, ACT 2601, Australia
| | - Franco L. Souza
- Universidade Federal de Mato Grosso do Sul, Centro de Ciências Biológicas e da Saúde, 79070-900 Campo Grande, Mato Grosso do Sul, Brazil
| | - Arthur Georges
- Institute for Applied Ecology, University of Canberra, ACT 2601, Australia
| | - Jaime Bertoluci
- Departamento de Ciências Biológicas, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Av. Pádua Dias 11, 13418-900 Piracicaba, São Paulo, Brazil
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