“…The population of O. beta on the Mexican coast lives in a tropical, eutrophic environment, with diurnal tidal variations, and with three well-defined seasons (dry, rainy and windy). Meanwhile, the Brazilian populations of O. beta are located within subtropical estuaries, with very similar rainfall, photoperiods and dominated by semidiurnal tides, which differ greatly from the environmental forces in the Mexican estuary (Spalding et al ., 2007; Gutiérrez-Mendieta & Lanza Espino, 2019).…”
Section: Discussionmentioning
confidence: 99%
“…CEL is a tropical estuary ~22 km long and 2 km wide, with an average depth of 1.5 m and connected to the Gulf of Mexico by a narrow channel ~460 m wide (Figure 1). The salinity inside the lagoon varies between 3.1 and 37.4 with the diurnal tide (Gutiérrez-Mendieta & Lanza Espino, 2019). Fig.…”
Otoliths are an excellent tool in studies on ecological connectivity of fish species populations. Opsanus beta is an invasive species introduced on the Brazilian coast, but not native from the Gulf of Mexico. The present study aimed to compare the otolith contours of specimens collected in Mexico (Celestún, CEL) and in two Brazilian estuaries (Santos Bay, STB, and Paranaguá Estuarine Complex, PEC). In the laboratory, 99 otoliths were extracted, photographed and compared using wavelet analysis. The otolith contours varied between sites (39 from CEL, 26 from STB and 34 from PEC). The linear discriminant analysis correctly reclassified 87.9% of otoliths by sites, with the best reclassifications in the CEL (97.36%), followed by PEC (88.23%) and SBT (73.07%). MANOVA showed significant differences in otolith contours between sites (F = 5.37; P < 0.005). The otolith contour from CEL was significantly different from those from the PEC and SBT. However, the otolith contour of the two Brazilian estuaries did not significantly differ among them (MANOVA, P > 0.005). Our results indicate O. beta populations on the Brazilian coast are connected, and probably isolated from the Mexican population.
“…The population of O. beta on the Mexican coast lives in a tropical, eutrophic environment, with diurnal tidal variations, and with three well-defined seasons (dry, rainy and windy). Meanwhile, the Brazilian populations of O. beta are located within subtropical estuaries, with very similar rainfall, photoperiods and dominated by semidiurnal tides, which differ greatly from the environmental forces in the Mexican estuary (Spalding et al ., 2007; Gutiérrez-Mendieta & Lanza Espino, 2019).…”
Section: Discussionmentioning
confidence: 99%
“…CEL is a tropical estuary ~22 km long and 2 km wide, with an average depth of 1.5 m and connected to the Gulf of Mexico by a narrow channel ~460 m wide (Figure 1). The salinity inside the lagoon varies between 3.1 and 37.4 with the diurnal tide (Gutiérrez-Mendieta & Lanza Espino, 2019). Fig.…”
Otoliths are an excellent tool in studies on ecological connectivity of fish species populations. Opsanus beta is an invasive species introduced on the Brazilian coast, but not native from the Gulf of Mexico. The present study aimed to compare the otolith contours of specimens collected in Mexico (Celestún, CEL) and in two Brazilian estuaries (Santos Bay, STB, and Paranaguá Estuarine Complex, PEC). In the laboratory, 99 otoliths were extracted, photographed and compared using wavelet analysis. The otolith contours varied between sites (39 from CEL, 26 from STB and 34 from PEC). The linear discriminant analysis correctly reclassified 87.9% of otoliths by sites, with the best reclassifications in the CEL (97.36%), followed by PEC (88.23%) and SBT (73.07%). MANOVA showed significant differences in otolith contours between sites (F = 5.37; P < 0.005). The otolith contour from CEL was significantly different from those from the PEC and SBT. However, the otolith contour of the two Brazilian estuaries did not significantly differ among them (MANOVA, P > 0.005). Our results indicate O. beta populations on the Brazilian coast are connected, and probably isolated from the Mexican population.
Contexto: La amplia variación en los parámetros fisicoquímicos y biológicos costeros, son resultado de factores locales naturales: clima, geomorfología, influencia marina, descargas fluviales, como los antropogénicos, resultando variaciones amplias y esto ha dado lugar al uso de promedios que no reflejan la realidad acuática. Por lo anterior el presente estudio analiza el comportamiento teórico de los parámetros conservativos y los no conservativos y biológicos de lagunas costeras tanto del Golfo de México como del Pacífico mexicano, a través de datos referidos como mínimos, máximos y promedio, y su grado certeza.
Metodología: Se recabó información fisicoquímica y biológica de 11 lagunas costeras con diferencias ambientales extremas: cinco de la vertiente del Golfo de México y seis del Pacífico mexicano, según la disponibilidad y continuidad de la información.
Resultados: Los intervalos de los parámetros conservativos y no conservativos (máximo y mínimo) fueron significativamente amplios, asociados a factores climáticos estacionales (precipitaciones y estiaje), descargas fluviales temporales o permanentes, manejo del agua en el área terrestre adyacente, así como por la influencia mareal. Por lo tanto, emplear un promedio basado en máximos y mínimos de esos factores no es recomendable. En los parámetros no conservativos hubo diferencias de variación cortas o de mayor amplitud; debidas a la dinámica de circulación, época, incluso, a la anualidad hasta la interanualidad, por lo que no es recomendable utilizar promedios. Con base en lo anterior, se estimaron mayores variaciones en los parámetros acuáticos en las lagunas del Pacífico y mayor homogeneidad en las del Golfo de México, resultado de la regularidad fluvioclimática, menor influencia antropogénica y de menor manejo costero.
Conclusiones: Para un diagnostico con una visión integrativa de los factores fisicoquímicos y biológicos costeros, es necesario basarse en el conocimiento de las condiciones normales locales que incluyen: la dinámica física, fluvial, geomorfológica e influencias terrestres adyacentes, para diferenciarse de los impactos antropogénicos, que modifican las características acuáticas; por lo que no es adecuado referir los resultados como mínimos, máximos y promedios que en muchos casos el intervalo entre el primero y el último puede ser amplio, inseguro y erróneo; además de no ser repetitivos o permanentes y variar heterogéneamente, como se pudo apreciar en las lagunas elegidas del Golfo de México y Pacífico Mexicano.
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