Biometrie sexual and ontogenetic dimorphism on the marine catfish Genidens genidens (Siluriformes, Ariidae) in a tropical estuary
This paper aims to study the ontogenetic sexual dimorphism of Genidens genidens in Guanabara Bay, southeastern coast of Brazil. Altogether 378 specimens were anayzed (233 females and 145 males) with total length ranging from 13.3 to 43.5 cm. Specimens were measured for 12 body measurements, sex was...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Escuela de Ciencias del Mar, Facultad de Recursos Naturales, Pontificia Universidad Católica de Valparaíso
2015-11-01
|
| Series: | Latin American Journal of Aquatic Research |
| Subjects: | |
| Online Access: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2015000500009&lng=en&tlng=en |
| _version_ | 1818364946954584064 |
|---|---|
| author | Larissa G Paiva Luana Prestrelo Kiani M Sant' Anna Marcelo Vianna |
| author_facet | Larissa G Paiva Luana Prestrelo Kiani M Sant' Anna Marcelo Vianna |
| author_sort | Larissa G Paiva |
| collection | DOAJ |
| description | This paper aims to study the ontogenetic sexual dimorphism of Genidens genidens in Guanabara Bay, southeastern coast of Brazil. Altogether 378 specimens were anayzed (233 females and 145 males) with total length ranging from 13.3 to 43.5 cm. Specimens were measured for 12 body measurements, sex was identified and maturity stages were recorded and classified. Pearson's linear correlation reveled a significant positive correlation between total length and all other body measures, except for base adipose fin, mouth depth and eye depth for immature females. Analyses nested PERMANOVA desing showed significant differences between maturity stages for each sex, between sexes considering or not maturity stages, indicating a variation in morphometric characteristics driven by sexual dimorphism. Differences among all maturity stages were also found, indicating an ontogenetic morphological difference. But immature individuals didn't differ between sexes indicating that differentiation patterns starts with sexual development. The most important measures differing males and females were related to head characteristics, which appears to be key parameters to evaluate sexual differences. Due to male incubation of fertilized eggs and juvenile individuals <59 mm in their oral cavity, head measures are proposed to be sex dimorphism not related to reproduction, but with post reproductive fase due to ecological and biological needs. |
| first_indexed | 2024-12-13T22:12:27Z |
| format | Article |
| id | doaj.art-bb840d4e121948b39f63cff467fff9e1 |
| institution | Directory Open Access Journal |
| issn | 0718-560X |
| language | English |
| last_indexed | 2024-12-13T22:12:27Z |
| publishDate | 2015-11-01 |
| publisher | Escuela de Ciencias del Mar, Facultad de Recursos Naturales, Pontificia Universidad Católica de Valparaíso |
| record_format | Article |
| series | Latin American Journal of Aquatic Research |
| spelling | doaj.art-bb840d4e121948b39f63cff467fff9e12022-12-21T23:29:41ZengEscuela de Ciencias del Mar, Facultad de Recursos Naturales, Pontificia Universidad Católica de ValparaísoLatin American Journal of Aquatic Research0718-560X2015-11-0143589590310.3856/vol43-issue5-fulltext-9S0718-560X2015000500009Biometrie sexual and ontogenetic dimorphism on the marine catfish Genidens genidens (Siluriformes, Ariidae) in a tropical estuaryLarissa G Paiva0Luana Prestrelo1Kiani M Sant' Anna2Marcelo Vianna3Universidade Federal do Rio de JaneiroUniversidade Federal do Rio de JaneiroUniversidade Federal do Rio de JaneiroUniversidade Federal do Rio de JaneiroThis paper aims to study the ontogenetic sexual dimorphism of Genidens genidens in Guanabara Bay, southeastern coast of Brazil. Altogether 378 specimens were anayzed (233 females and 145 males) with total length ranging from 13.3 to 43.5 cm. Specimens were measured for 12 body measurements, sex was identified and maturity stages were recorded and classified. Pearson's linear correlation reveled a significant positive correlation between total length and all other body measures, except for base adipose fin, mouth depth and eye depth for immature females. Analyses nested PERMANOVA desing showed significant differences between maturity stages for each sex, between sexes considering or not maturity stages, indicating a variation in morphometric characteristics driven by sexual dimorphism. Differences among all maturity stages were also found, indicating an ontogenetic morphological difference. But immature individuals didn't differ between sexes indicating that differentiation patterns starts with sexual development. The most important measures differing males and females were related to head characteristics, which appears to be key parameters to evaluate sexual differences. Due to male incubation of fertilized eggs and juvenile individuals <59 mm in their oral cavity, head measures are proposed to be sex dimorphism not related to reproduction, but with post reproductive fase due to ecological and biological needs.http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2015000500009&lng=en&tlng=enGenidens genidensbagreTeleosteimorfometríabiometríadimorfismoestuario tropical |
| spellingShingle | Larissa G Paiva Luana Prestrelo Kiani M Sant' Anna Marcelo Vianna Biometrie sexual and ontogenetic dimorphism on the marine catfish Genidens genidens (Siluriformes, Ariidae) in a tropical estuary Latin American Journal of Aquatic Research Genidens genidens bagre Teleostei morfometría biometría dimorfismo estuario tropical |
| title | Biometrie sexual and ontogenetic dimorphism on the marine catfish Genidens genidens (Siluriformes, Ariidae) in a tropical estuary |
| title_full | Biometrie sexual and ontogenetic dimorphism on the marine catfish Genidens genidens (Siluriformes, Ariidae) in a tropical estuary |
| title_fullStr | Biometrie sexual and ontogenetic dimorphism on the marine catfish Genidens genidens (Siluriformes, Ariidae) in a tropical estuary |
| title_full_unstemmed | Biometrie sexual and ontogenetic dimorphism on the marine catfish Genidens genidens (Siluriformes, Ariidae) in a tropical estuary |
| title_short | Biometrie sexual and ontogenetic dimorphism on the marine catfish Genidens genidens (Siluriformes, Ariidae) in a tropical estuary |
| title_sort | biometrie sexual and ontogenetic dimorphism on the marine catfish genidens genidens siluriformes ariidae in a tropical estuary |
| topic | Genidens genidens bagre Teleostei morfometría biometría dimorfismo estuario tropical |
| url | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2015000500009&lng=en&tlng=en |
| work_keys_str_mv | AT larissagpaiva biometriesexualandontogeneticdimorphismonthemarinecatfishgenidensgenidenssiluriformesariidaeinatropicalestuary AT luanaprestrelo biometriesexualandontogeneticdimorphismonthemarinecatfishgenidensgenidenssiluriformesariidaeinatropicalestuary AT kianimsantanna biometriesexualandontogeneticdimorphismonthemarinecatfishgenidensgenidenssiluriformesariidaeinatropicalestuary AT marcelovianna biometriesexualandontogeneticdimorphismonthemarinecatfishgenidensgenidenssiluriformesariidaeinatropicalestuary |