A Characterization of the Habitat of Charcharodon carcharias Between Hawaii and the Line Islands: To What Extent is Pelagic Prey Abundance a Determining Factor in Habitat Choice
نویسنده
چکیده
This study attempted to describe the distribution patterns of great white sharks, C. carcharias, in the geostrophic eddy field between Hawaii and the Line Islands in relation to primary and secondary productivity in the water column. To do so, in situ chl-a fluorescence measurements as well as zooplankton net tows were taken along a cruise track between Hawaii the Line Islands. This data was analyzed together with an equivalent dataset collected in 2005 by Markman and Schwartz. Also, Pop Up Satellite Archival Tag (PSAT) data for white shark movements in the vicinity of Hawaii was used to determine the degree of correlation between white shark distribution and eddy locations. The results of this study tentatively suggest that firstly, geostrophic currents seem to boost primary and secondary productivity in a largely predictable manner, and secondly, that white sharks may take advantage of this by focusing on these relatively productive eddies during their aggregation period offshore of Hawaii.
منابع مشابه
Determination of Habitat Suitability Index and the most significant factors on distribution pattern of Capoeta capoeta in Roodbabol River, Mazandaran Province.
Presence-absence and abundance of each fish species in a river habitat depends on several factors and they prefer a specific range of each habitat factor. The present study was carried out to investigate habitat suitability index of Capoeta capoeta and the effect of habitat factors on its distribution and abundance in Roodbabol branch of the River Babolrood (Mazandaran Province). To do, fish sa...
متن کاملEssential fish habitats (EFH) of small pelagic fishes in the north of the Persian Gulf and Oman Sea, Iran
Small pelagic fishes particularly anchovy (Encrasicholina punctifer) and sardine (Sardinella sindensis) have an important role to support the Iranian fisheries, and are distributed along the entire length of the Persian Gulf and Oman Sea coastal waters. Using small pelagic fisheries logbook, a GIS-based environmental modelling approach was applied to investigate the presence and abundance of an...
متن کاملSelection of nesting habitat of hawksbill turtle (Eretmochelys imbricata) in two coral islands of Qeshm and Hengam in the Persian Gulf, Iran
The Persian Gulf islands are the nesting regions for the severely endangered hawksbill turtle (Eretmochelys imbricata) species. Therefore, the selection of the nesting habitat of this species in the two islands of Qeshm and Hengam was studied by a five-member working group in the spring of 2013 - 2015. Ultimately, 23 and 17 nests were identified in the south of Qeshm Island and in the south and...
متن کاملDetermining factor in habitat selection of Paracobitis iranica (Nalbant & Bianco 1998) population in Kordan River, Namak Lake Basin, Iran
Considering the fact that fish biodiversity conservation and land uses planning, require reliable information about fish distribution and habitat use patterns In order to describe species habitat properties, habitat use and habitat selectivity indices are applied. Relative frequency and environmental variables, depth, width, slope of river, altitude, velocity, substrate, Overstream canopy closu...
متن کاملMigration and habitat of white sharks (Carcharodon carcharias) in the eastern Pacific Ocean
Satellite telemetry studies of 20 adult and subadult white sharks (360–530 cm estimated total length (TL)) in the eastern North Pacific during 1999–2005 revealed long distance seasonal migrations from the coast of California to an offshore focal area 2,500 km west of the Baja Peninsula, as well as the Hawaii Islands. Three tags were recovered allowing detailed behavioral analyses, including one...
متن کامل