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| Author(s): |
Camila Hipolito Bernardo
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Botucatu. 2017-12-06. |
| Institution: | Universidade Estadual Paulista (Unesp). Instituto de Biociências. Botucatu |
| Defense date: | 2017-02-21 |
| Advisor: | Adilson Fransozo |
| Abstract | |
Artemesia longinaris Spence Bate, 1888 is considered a monotypic species endemic to the coastal areas of the Western South Atlantic. It has recently been commercially exploited due to the fall in stocks of shrimps of major commercial interest. This study aimed at comparing the temporal distribution of A. longinaris over a period of 20 years (November / 1988 to October / 1989 and November / 2008 to October / 2009) at Fortaleza Bay in Ubatuba, São Paulo. In both periods the individuals and environmental factors (temperature and salinity of the bottom and surface water, sediment) were collected in 7 transects. An RDA was made to relate environmental factors to the abundance of individuals. The Mann-Whitney test was performed to compare environmental factors and abundance of individuals between the two periods. There were collected 3088 specimens in the first period and 1252 specimens in the second, with no significant difference between the periods (p> 0.05). Although not statistically indicated, there was a reduction in the number of individuals between the periods. According to the results of the GDR, a strong negative correlation between the abundance and class C (silt + clay) of the sediment showed that the increase of this type of sediment in the second period may have contributed to the reduction of the number of individuals. Along with this, there were smaller reflexes of the ACAS mass in this cove, causing a reduction in the number of individuals. This body of water reduces background temperatures, and the species under study has an evolutionary history linked to cold oceanic waters. In addition to the ACAS sediment and reflex conditions, the intense shrimp trawling activity in the Ubatuba region may have contributed to a reduction in the number of individuals, since, as is well known, trawling is considered a predatory activity and causes destabilization of the benthic community. In both periods the species was concentrated in the deeper transects (I, VI and VII) where the environmental characteristics were more favorable (low temperature and high salinity). Knowledge about the ecological distribution of this species is important for sustainable management of fish stocks. The Fortress Cove is since October 8, 2008, an Environmental Protection Area (APA), which aims to preserve this biodiversity. Future studies could show whether the shrimp A. longinaris stock is recovering due to the protection measures established in the region. (AU) | |
| FAPESP's process: | 15/13607-6 - POPULATIONAL DYNAMIC OF "BARBA-RUÇA" SHRIMP Artemesia longinaris (BATE, 1888) (CRUSTACEA, DECAPODA, PENAEIDAE) IN TWO DIFFERENT PERIODS (OVER A RANGE OF 20 YEARS) IN SOUTHEASTERN OF BRAZIL |
| Grantee: | Camila Hipolito Bernardo |
| Support Opportunities: | Scholarships in Brazil - Master |