Natural hybridization between immigrant narrow–barred Spanish mackerel Scomberomorus commerson (Lacepède, 1800) and endemic West African Spanish mackerel Scomberomorus tritor (Cuvier, 1832) in the Egyptian Mediterranean coast
| Autor: | Shnoudy A. Bakhoum |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Mediterranean climate Narrow-barred Spanish mackerel Scomberomorus tritor autóctono Hibridación natural West African Spanish mackerel 010603 evolutionary biology 01 natural sciences Condition factor 03 medical and health sciences Scomberomorus commerson 030304 developmental biology Nature and Landscape Conservation 0303 health sciences biology Hybrid type Inmigrante biology.organism_classification Spanish mackerel Scomberomorus Costa mediterránea de Egipto Geography QL1-991 Fish Animal Science and Zoology Humanities Zoology |
| Zdroj: | Animal Biodiversity and Conservation, Vol 44, Iss 2 (2021) |
| Popis: | espanolSe capturaron ejemplares inmigrantes de carita estriada del Pacifico y de carita oeste–africana y otros ejemplares con un aspecto externo intermedio entre estos progenitores putativos en la bahia de Abu Qir, al este de Alejandria, en Egipto. Los resultados del analisis univariado y multivariado del indice de hibridacion indicaron que existia hibridacion natural entre las especies parentales previstas. La funcion discriminante permite determinar si un determinado ejemplar del que se tienen datos pertenece a uno de los tres grupos y calcular su tasa de exito. Las distancias cuadradas de Mahalanobis obtenidas entre los grupos analizados indicaron que los tres grupos estaban claramente diferenciados y que las distancias entre los hibridos y Scomberomorus tritor eran superiores a las de los hibridos y S. commerson. Los valores medios del factor de condicion de los ejemplares hibridos fueron significativamente mayores que los de S. commerson; ademas, la mortalidad natural de los hibridos fue significativamente inferior a la de los progenitores exoticos (S. commerson), lo que indica que las condiciones ambientales de la region estudiada son mas adecuadas para el tipo hibrido que para las especies parentales invasoras. EnglishImmigrant narrow–barred Spanish mackerel, West African Spanish mackerel and specimens with an external appearance somewhere between these putative parents were collected from Abu Qir Bay, East Alexandria, Egypt. The hybrid index results and univariate and multivariate analysis indicated a natural hybridization between these two species. The discriminant function analysis successfully classified individual fish in the data to one of the three fish groups. Squared Mahalanobis distances extracted from the groups indicated the three groups were clearly distinct from each other. Moreover, distances between the hybrid and Scomberomorus tritor were longer than those of the hybrid and S. commerson. The mean values of the condition factor for the hybrid were significantly higher than those of S. commerson. Natural mortality of the hybrid was significantly lower than that of the exotic parent (S. commerson), indicating that the environmental conditions in the examined region are more suitable for the hybrid type species than for the invasive parental specie |
| Databáze: | OpenAIRE |
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