Seasonal Occurrence of Cownose Rays ( Rhinoptera bonasus ) in North Carolina’s Estuarine and Coastal Waters
作者： M. April Goodman , Paul B. Conn , Eric Fitzpatrick
DOI: 10.1007/S12237-010-9355-5
关键词: Aerial survey 、 Abundance (ecology) 、 Environmental science 、 Rhinoptera bonasus 、 Sea surface temperature 、 Habitat 、 Sound (geography) 、 Oceanography 、 Estuary 、 Seasonality
摘要: The seasonal occurrence of cownose rays (Rhinoptera bonasus) within North Carolina’s estuarine and coastal waters was examined from aerial surveys conducted during 2004–2006. Generalized linear models were used to assess the influence several variables (month, year, habitat type, sea surface temperature, turbidity) on predicted counts rays. spatial distributions compared by season, differences in group size tested as a function season habitat. Cownose ray data associated with Carolina Division Marine Fisheries (NCDMF) fishery independent gill net sampling program Pamlico Sound also observations. Rays immigrated into region mid-spring (April), dispersed throughout estuary summer (June–August), emigrated late autumn (November). Predicted highest spring (April, May) (September–November) for habitats habitats. higher than when temperatures above average. Comparison type revealed substantially larger sizes estuarine. In addition, estuary, had surveys; habitat, significantly or sizes. NCDMF indicated similar trends monthly migration patterns well increased abundance 2008 2009 2003–2007. These results suggest that serve important rays, species may utilize nursery and/or foraging.
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