Full text
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| Author(s): |
Carolina Costa de Araujo
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto Oceanográfico (IO/DIDC) |
| Defense date: | 2013-02-26 |
| Examining board members: |
Maria de los Angeles Gasalla;
Ana Cristina Andrade Moreno Marques;
José Angel Alvarez Perez
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| Advisor: | Maria de los Angeles Gasalla |
| Abstract | |
Loliginid squids are fisheries resources of increasing importance in the shelf ecosystem of Southeastern Brazil. Therefore, information about distribution of the early stages of their life cycle is scarce. Based on plankton samples collected by eleven historical oceanographic surveys cruises of the University of São Paulo\'s Oceanographic Institute between 1991 and 2005, the present study aimed identification of the occurrence of Loliginidae paralarvae in the region between Cabo de São Tomé (22ºS) and Cananéia (25ºS). From 664 samples analyzed, 246 paralarvae were found, being 121 identified to the species level, (Doryteuthis sanpaulensis n=75, Doryteuthis plei n=39,, Lolliguncula brevis n=6 and Pickfordiateuthis pulchella, n=1). The distributional patterns of Loliginidae in relation to oceanographic processes were identified by using horizontal and vertical maps of abundance, temperature and salinity. Generalized Linear Models (GLMs) were used to detect the factors that explain Loliginidae occurrence and abundance, which indicated that depth and sea surface temperature, were major explanatory variables. A Redundancy Analyses (RDA) showed the main observed distribution patterns of the three species of Loliginidae in relation to oceanographic variables. D. sanpaulensis occurred in the northern region associated to cold waters and upwelling events. D. plei occurred mainly in the southern region of the study area and in warmer waters.L. brevis was found in the estuarine region of Santos, in shallow and low salinity waters. The obtained results represent a relevant contribution to squids Fisheries Oceanography in the regional marine ecosystem. (AU) | |
| FAPESP's process: | 10/03733-0 - Fisheries oceanography of the early stages of squid Loliginidae (Cephalopoda: Myopsida): spatial-temporal distribution of paralarvae along continental shelf between Cabo de São Tomé (RJ) and Cananéia (SP) (22ºS-25ºS) |
| Grantee: | Carolina Costa de Araújo |
| Support Opportunities: | Scholarships in Brazil - Master |