Spatial and Dietary Overlap Creates Potential for Competition between Red Snapper Lutjanus campechanus and Vermilion snapper Rhomboplites aurorubensReportar como inadecuado




Spatial and Dietary Overlap Creates Potential for Competition between Red Snapper Lutjanus campechanus and Vermilion snapper Rhomboplites aurorubens - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Understanding the complex nature of direct and indirect species interactions is a critical precursor to successful resource management. In the northern Gulf of Mexico fisheries ecosystem, red snapper Lutjanus campechanus and vermilion snapper Rhomboplites aurorubens are two commercially harvested species within a larger reef fish complex. These two species share similar habitats and diets; however, little is known about how these species partition habitat and dietary resources. In this study we examined the extent of spatial and dietary overlap between red snapper and vermilion snapper, and experimentally compared their feeding behavior. Field data from multiple gear types demonstrates that red snapper and vermilion snapper frequently cohabited reefs in the northern Gulf of Mexico, and Pianka’s niche overlap indices suggest significantly overlapping diets. Experimental manipulations show that red snapper are the dominant forager of the two species, as red snapper foraging alone ate more shrimp per fish than vermilion snapper in both the single species p = 0.003 and mixed species p = 0.02 treatments. In addition, red snapper ate significantly more shrimp per fish in the mixed species treatment than in the single species treatment p = 0.04. Vermilion snapper shrimp consumption per fish did not differ significantly between mixed and single species treatments. Cumulatively, our results suggest that spatial and dietary overlap could lead to competition between red and vermilion snapper in the study area; however, conclusively determining the existence of such competition would require further research.



Autor: William T. Davis, J. Marcus Drymon , Sean P. Powers

Fuente: http://plos.srce.hr/



DESCARGAR PDF




Documentos relacionados