Latitudinal and ecological correlates of morphological variation in Galaxias platei (Pisces, Galaxiidae) in Patagonia

Milano, Daniela; Ruzzante, Daniel E.; Cussac, Víctor E.; Macchi, Patricio J.; Ferriz, Ricardo A.; Barriga, Juan Pablo; Aigo, Juana; Lattuca, María Eugenia; Walde, Sandra J.

doi:10.1111/j.1095-8312.2006.00556.x

Cited by 49 publications

(59 citation statements)

References 40 publications

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“…Thereon numerous studies have shown that fi sh exhibit considerable morphometric variation throughout its distributional range that often results from competition for resources in heterogeneous environments (i.e., rapid or slow-moving complex environments and benthic or mostly limnetic habitat) or from spatial or temporal heterogeneity in predation intensity (Milano et al 2002, Aguirre 2009). Also, the variability in morphometric traits of freshwater fi sh has been related to factors that are likely associated with colonization history (i.e., geography, direction of drainage, river basin, latitude) and current selection pressures (Milano et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Eugerres castroaguirrei González-Acosta et Rodiles-Hernández, 2013 is a junior synonym of Eugerres mexicanus (Steindachner, 1863) (Actinopterygii: Perciformes: Gerreidae)

Martínez-Guevara¹

2015

Acta Ichthyol. Piscat.

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Background. The Lacandon mojarra, Eugerres castroaguirrei González-Acosta et Rodiles-Hernández, 2013, was described from the Grijalva-Usumacinta River basin (Mexico). According to the diagnosis E. castroaguirrei differs from the only other freshwater Gerreidae, the Mexican mojarra, Eugerres mexicanus (Steindachner, 1863) by the combination of certain morphological characters. However, a comparison of materials obtained in the Usumacinta River, besides of type materials and other preserved specimens, yielded contradictory results. Therefore, the objective of this paper was to clearly determine if E. mexicanus and E. castroaguirrei are subjective synonyms applying morphological and molecular analyses. Materials and methods. A total of 44 specimens were included in this study including the specimens collected specifi cally for this study, the type and non-type materials of Eugerres castroaguirrei from Colección de Peces de El Colegio de la Frontera Sur, Unidad San Cristóbal, Chiapas, México, and the types of Eugerres mexicanus, belonging to the Museum of Natural History, Wien, Austria. The morphological comparison also included data from the 42 specimens of E. castroaguirrei reported in the new species description. Biometric data were analysed as body proportions. We used Friedman's test to compare our biological materials with those used in the new species description. Molecular genetics comparisons on both putative freshwater gerreid species were made based on three mitochondrial gene fragments: 12SrRNA, 16SrRNA, and Cytochrome Oxidase subunit I (COI), and the nuclear gene: Recombination-Activating protein 1 (RAG1). Results. Neither the non-parametric Friedman's test nor the Nemenyi's procedure showed differences among individuals for both putative species in multiple pair-wise comparisons of body proportions. Moreover, the genetic divergence from all genes indicated that all individuals exhibited almost identical sequences, with inter-specifi c pair-wise genetic distances that ranged from 0.00% to 0.100% in all of the fragments. Conclusion. Our morphological and molecular genetics analyses demonstrated that E. mexicanus and E. castroaguirrei are subjective synonyms, therefore, Eugerres mexicanus (Steindachner, 1863) must be considered a valid species name, and Eugerres castroaguirrei González-Acosta et Rodiles-Hernández, 2013 a junior synonym.

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Section: Discussionmentioning

confidence: 99%

Eugerres castroaguirrei González-Acosta et Rodiles-Hernández, 2013 is a junior synonym of Eugerres mexicanus (Steindachner, 1863) (Actinopterygii: Perciformes: Gerreidae)

Martínez-Guevara¹

2015

Acta Ichthyol. Piscat.

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“…However, the progressive southward disappearance of the 'otunos' Diplomystes cuyanus, D. viedmensis, and D. mesembrinus, the 'bagre' Trichomycterus areolatus, H. macraei, the Patagonian 'pejerrey' Odontesthes hatcheri and, finally, the 'perca' Percichthys trucha is noticeable. The lowest diversity occurs on Tierra del Fuego Island, the southernmost (54°S) area of the world with freshwater fish fauna, where only salmonids (Becker et al 2007;Pascual and Ciancio 2007) and four native species of the Galaxiidae family are found (Cussac et al 2004;Liotta 2006;Milano et al 2006). …”

Section: The Decrease In the South American Freshwater Fish Diversitymentioning

confidence: 99%

“…This species is mostly restricted to montane lakes and streams of Patagonia, and it shows an extremely high endurance to low temperature and low oxygen availability (Milano 2003;Cussac et al 2004) as well as major between-lakes variations in the morphology of the caudal peduncle. This variation can be correlated with the predation risk observed within each lake (Milano et al 2002(Milano et al , 2006. Within the tolerance range, the capability to endure cold winters depends on being able to endure starvation (Shutter and Post 1990).…”

Section: Influence Of Temporal Changes In Climate On Geological Scalesmentioning

confidence: 99%

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Fishes of southern South America: a story driven by temperature

Cussac

Fernández

Gómez

et al. 2008

Fish Physiol Biochem

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The latitudinal extension of southern South America imposes a thermal gradient that affects the structure of marine and freshwater fish assemblages and the biology of the species through direct exposure to the temperature gradients or by means of a web of historical and ecological relationships. We have reviewed biological and ecological data of marine and freshwater fishes from the southern Neotropics, including Patagonia, and report several examples of dependence on temperature, from glacial times to today's climate change. We were able to identify historic and present effects on the diversity of fish assemblages, isolation, southern limits for the distribution of species, and morphological variation among populations. There is a wide range of characteristics that exemplify an adaptation to low temperatures, including biochemical peculiarities, physiological adjustments, and alternative life history patterns, and these appear in both freshwater and marine, and native and exotic fishes. The consequences of stable temperature regimes in both the ocean and thermal streams deserve special mention as these shape specialists under conditions of low selective pressure. At present, habitat use and interactions among species are being subject to changes as consequences of water temperature, and some of these are already evident in the northern and southern hemispheres.

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“…Comparando con los ecosistemas de agua dulce templados del hemisferio norte, hay relativamente menos estudios sobre las adaptaciones ecomorfológicas en el ensamblado de peces de ecosistemas neotropicales (Winemiller, 1991;Menni et al, 1996;Mérigoux & ponton, 1998;pouilly et al, 2003;Willis et al, 2005;Casatti & Castro, 2006;Milano et al, 2002Milano et al, , 2006Ferreira, 2007). ringuelet et al (1967) y ringuelet (1975) indican que los peces de aguas continentales pueden diferenciarse en tipos ecológicos basado en características morfológicas, al hábitat que ocupan y a su comportamiento, este sistema que fue utilizado para categorizar los tipos ecológicos de los peces del centro del país (Haro et al, y 1987 y los del embalse de salto Grande (delfino et al, 1997).…”

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Diet and ecomorphology of the ichthyofauna of Manantiales stream, Buenos Aires province, Argentina

Fernández¹,

Ferriz²,

Bentos³

et al. 2012

MACN

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Diet and ecomorphology of the ichthyofauna of Manantiales stream, Buenos Aires province, Argentina. the present study addresses the correlation between diet and morphology of 19 fish species that inhabit the Manantiales stream at the headwaters of the samborombón river, Buenos Aires province, Argentina. the species were classified into four trophic groups: carnivores, omnivores, insectivores and detritivores-alguivores. twelve ecomorfologic attributes related to habitat use and feeding patterns were analyzed to distinguish ecomorphologic groups of species with the food consumed. Univariate and multivariate analysis techniques were used to determine groups of species using the ecomorfologic and diet attributes as descriptors. Carnivores were associated with well developed head, mouth, pectoral and caudal fins and usually presenting compressed bodies. omnivores were a more heterogeneous group. nektonic forms of this group were associated with a compressed body, lateral eyes and relatively small size of the pectoral fins and caudal fins; nektobentonic forms were associated with small mouth, fusiform body and long caudal peduncle; benthic forms were related to depressed body, dorsal eyes, ventral mouth and long digestive tract. the only nektonic species consuming insects on the surface is characterized by a strongly compressed body, lateral eyes, tail and big wide mouth facing up. the detritus-alguivores had a long digestive tract, mouth ventral or terminal and long caudal fin. the significant relationship between diet and ecomorphology allows to sustain that fish with similar diets converge towards common ecomorfologicic attributes.Key words: diet, morphology, multivariate analysis, samborombón river, Argentina.Resumen: se estudio la correlación entre dieta y morfología de 19 especies de peces del arroyo Manantiales, cabecera del río samborombón, provincia de Buenos Aires, Argentina. Las especies fueron clasificadas en cuatro grupos tróficos: carnívoros, omnívoros, insectívoros y detritívoros-alguívoros. se analizaron 12 atributos ecomorfológicos relacionados con el uso del hábitat y la alimentación con el fin de distinguir patrones ecomorfológicos de las especies y de las especies con el alimento consumido. se utilizaron técnicas de análisis univariado y multivariado para determinar agrupamientos de especies utilizando los atributos ecomorfológicos y la dieta como descriptores. Los carnívoros se relacionaron con un buen desarrollo de cabeza, boca, aletas caudal y pectoral; y en general con cuerpos comprimidos. Los omnívoros constituyeron un grupo más heterogéneo. Las formas nectóni-cas de este grupo se relacionaron con un cuerpo comprimido, ojos laterales y tamaño relativamente pequeño de las aletas pectorales y aleta caudal; las formas nectobentónicas se relacionaron con boca pequeña, cuerpo fusiforme y pedúnculo caudal largo; y las formas bentónicas, con cuerpo deprimido, ojos de posición dorsal, boca ínfera y tubo digestivo largo. La única especie nectónica consumidora de insectos sobre la superficie ...

show abstract

Latitudinal and ecological correlates of morphological variation in Galaxias platei (Pisces, Galaxiidae) in Patagonia

Cited by 49 publications

References 40 publications

Eugerres castroaguirrei González-Acosta et Rodiles-Hernández, 2013 is a junior synonym of Eugerres mexicanus (Steindachner, 1863) (Actinopterygii: Perciformes: Gerreidae)

Eugerres castroaguirrei González-Acosta et Rodiles-Hernández, 2013 is a junior synonym of Eugerres mexicanus (Steindachner, 1863) (Actinopterygii: Perciformes: Gerreidae)

Fishes of southern South America: a story driven by temperature

Diet and ecomorphology of the ichthyofauna of Manantiales stream, Buenos Aires province, Argentina

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