Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern Brazil
Abstract: Aim To investigate reproductive characteristics in a small population of Psalidodon aff. fasciatus living in isolation in an environment with a unique geological configuration, a doline-shaped depression (known as Furna 2), with a mean diameter of 80 m and water depth of 50 m, a natural h...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Limnologia
2023-10-01
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| Series: | Acta Limnologica Brasiliensia |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2023000100720&tlng=en |
| _version_ | 1797658863581790208 |
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| author | Franciele Fernanda Kerniske Luz Elena De la Ossa-Guerra Roger Henrique Dalcin Igor de Paiva Affonso Roberto Ferreira Artoni Vinícius Abilhoa |
| author_facet | Franciele Fernanda Kerniske Luz Elena De la Ossa-Guerra Roger Henrique Dalcin Igor de Paiva Affonso Roberto Ferreira Artoni Vinícius Abilhoa |
| author_sort | Franciele Fernanda Kerniske |
| collection | DOAJ |
| description | Abstract: Aim To investigate reproductive characteristics in a small population of Psalidodon aff. fasciatus living in isolation in an environment with a unique geological configuration, a doline-shaped depression (known as Furna 2), with a mean diameter of 80 m and water depth of 50 m, a natural heritage of the Vila Velha State Park (VVSP). Methods The fish were collected between February 2019 and January 2020 using nets and pots; standard length and total weight were measured. The gonads were also removed for histological analysis. Estimates were made for the weight-length ratio, the relative condition factor, the sex ratio, and the size at first maturity (L50 and L95) for males and females. Results The five gonadal stages that were characterized (resting, early mature, mature, partially empty, and totally empty) were consistent with what was expected for the species. The results obtained here indicate that these lambaris have an opportunistic (r) life strategy. Compared to previous studies, we discovered that fish of this population start maturing at smaller sizes. Indicating negative allometric growth, the length-weight ratio was WT = 0.0002 * LT2.3039, and the condition index (Kn = 0.95) showed no significant gender differences. When compared to other non-isolated populations of the same species, the population's sex ratio showed an unexpectedly significant male predominance (1M: 0.6 F). Conclusions Our results show an imbalance in the sex ratio, contrary to what would be expected for non-isolated populations. This imbalance may be related to the complete isolation of this environment, suggesting that females may be affected by some evolutionary force, such as inbreeding. However, other factors cannot be ruled out, as the underlying genetic mechanisms remain unknown, and only future investigations can reveal a more complete understanding of reproduction in isolated populations. |
| first_indexed | 2024-03-11T18:05:28Z |
| format | Article |
| id | doaj.art-bf15ce8212784df89bcf2259a62d5488 |
| institution | Directory Open Access Journal |
| issn | 2179-975X |
| language | English |
| last_indexed | 2024-03-11T18:05:28Z |
| publishDate | 2023-10-01 |
| publisher | Associação Brasileira de Limnologia |
| record_format | Article |
| series | Acta Limnologica Brasiliensia |
| spelling | doaj.art-bf15ce8212784df89bcf2259a62d54882023-10-17T07:40:09ZengAssociação Brasileira de LimnologiaActa Limnologica Brasiliensia2179-975X2023-10-013510.1590/s2179-975x1023Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern BrazilFranciele Fernanda Kerniskehttps://orcid.org/0000-0002-7559-5331Luz Elena De la Ossa-Guerrahttps://orcid.org/0000-0001-7407-9709Roger Henrique Dalcinhttps://orcid.org/0000-0001-7896-7404Igor de Paiva Affonsohttps://orcid.org/0000-0002-1013-8543Roberto Ferreira Artonihttps://orcid.org/0000-0002-2528-9846Vinícius Abilhoahttps://orcid.org/0000-0002-9463-0200Abstract: Aim To investigate reproductive characteristics in a small population of Psalidodon aff. fasciatus living in isolation in an environment with a unique geological configuration, a doline-shaped depression (known as Furna 2), with a mean diameter of 80 m and water depth of 50 m, a natural heritage of the Vila Velha State Park (VVSP). Methods The fish were collected between February 2019 and January 2020 using nets and pots; standard length and total weight were measured. The gonads were also removed for histological analysis. Estimates were made for the weight-length ratio, the relative condition factor, the sex ratio, and the size at first maturity (L50 and L95) for males and females. Results The five gonadal stages that were characterized (resting, early mature, mature, partially empty, and totally empty) were consistent with what was expected for the species. The results obtained here indicate that these lambaris have an opportunistic (r) life strategy. Compared to previous studies, we discovered that fish of this population start maturing at smaller sizes. Indicating negative allometric growth, the length-weight ratio was WT = 0.0002 * LT2.3039, and the condition index (Kn = 0.95) showed no significant gender differences. When compared to other non-isolated populations of the same species, the population's sex ratio showed an unexpectedly significant male predominance (1M: 0.6 F). Conclusions Our results show an imbalance in the sex ratio, contrary to what would be expected for non-isolated populations. This imbalance may be related to the complete isolation of this environment, suggesting that females may be affected by some evolutionary force, such as inbreeding. However, other factors cannot be ruled out, as the underlying genetic mechanisms remain unknown, and only future investigations can reveal a more complete understanding of reproduction in isolated populations.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2023000100720&tlng=enlambarireproductionsex ratiogonadsinbreeding |
| spellingShingle | Franciele Fernanda Kerniske Luz Elena De la Ossa-Guerra Roger Henrique Dalcin Igor de Paiva Affonso Roberto Ferreira Artoni Vinícius Abilhoa Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern Brazil Acta Limnologica Brasiliensia lambari reproduction sex ratio gonads inbreeding |
| title | Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern Brazil |
| title_full | Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern Brazil |
| title_fullStr | Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern Brazil |
| title_full_unstemmed | Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern Brazil |
| title_short | Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern Brazil |
| title_sort | reproductive aspects of an isolated population of psalidodon aff fasciatus teleostei characidae from southern brazil |
| topic | lambari reproduction sex ratio gonads inbreeding |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2023000100720&tlng=en |
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