Dinâmica da vitelogênese durante a maturação ovariana em Artemesia longinaris

Pós-graduação em Aquicultura - FCAV

Statistical and dynamical properties of a dissipative kicked rotator

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Life-history traits of the red brocade hermit crab Dardanus insignis on the subtropical Brazilian coast

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Environmental factors influencing the distribution of three species within the genus Persephona Leach, 1817 (Crustacea, Decapoda, Leucosiidae) in two regions on the northern coast of Sao Paulo State, Brazil

Patterns of spatio-temporal distribution of Brachyura are determined by the interaction among life history traits, inter and intraspecific relationships, as well as by the variation of abiotic factors. This study aimed to characterize patterns of spatio-temporal distribution of Persephona lichtensteinii, Persephona mediterranea and Persephona punctata in two regions of the northern coast of Sao Paulo State, southeastern region of Brazil. Collections were done monthly from July 2001 to June 2003 in Caraguatatuba and Ubatuba, using a shrimp fishery boat equipped with double-rig nets. The patterns of species distribution were tested by means of redundancy analysis (RDA) and generalized linear mixed models (GLMM) in relation to the recorded environmental factors (BT: bottom temperature, BS: bottom salinity, OM: organic matter and granulometry (Phi)). The most influent environmental factor over the species distribution was the Phi, and the ascendant order of influence was P. lichtensteinii, P. punctata and P. mediterranea. The greater abundance of P. mediterranea showed a conservative pattern of distribution for the genus in the sampled region. The greater occurrence of P. punctata and P. lichtensteinii, in distinct transects than those occupied by P. mediterranea, seems to be a strategy to avoid competition among congeneric species, which is related to the substratum specificity.

How marine upwelling influences the distribution of Artemesia longinaris (Decapoda: Penaeoidea)?

Upwelling events can occur in most of the oceans altering the water physical, chemical and sediment conditions and consequently the species communities dwelling the areas. For better understanding the behavior of populations inhabiting upwelling regions, the spatial and temporal distribution of a Penaeoidea shrimp was studied correlating it with the abiotic factors that vary during upwelling and non-upwelling periods in an area under influence of Cabo Frio upwelling. Bottom salinity and temperature, organic matter and sediment type from each station were sampled from March 2008 to February 2010, in six stations located between 5 and 45 m depth. The lowest temperatures were recorded during spring and summer for both years with temperature values lower than 19 degrees C. A total of 26,466 Artemesia longinaris shrimps were captured mainly in 10-35 m depth. Upwelling periods showed significant differences in abundance in relation to non-upwelling periods. The spatial distribution among stations varied according to the temperature with higher abundance in stations with values between 19 and 21 degrees C. The highest abundance of A. longinaris was recorded in spring and summer when intrusions of the cold waters of South Atlantic Central Waters (SACW) were frequent. Thus, the effect of cold water of SACW boosted by the upwelling was a determinant factor in the spatial and temporal distribution of A. longinaris in the studied region.

Crises de fronteira e estruturas complexas no espaço de parâmetros em um mapeamento dissipativo bidimensional

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Ocorrência, morfometria e crescimento relativo da raia treme-treme Narcine brasiliensis (Olfers, 1831) (Elasmobranchii: Narcinidae) no litoral do Estado de São Paulo

Raias da espécie Narcine brasiliensis são frequentemente encontradas em regiões de substrato arenoso e lodoso localizadas entre o sudeste do Brasil e norte da Argentina, entretanto, há poucos estudos sobre seu ciclo de vida, assim como aspectos de sua distribuição e abundância. Verificar suas medidas corporais torna-se crucial para tais estudos, principalmente quando estes estão relacionados ao crescimento, maturação, comprimento máximo e estrutura populacional de elasmobrânquios. O presente estudo teve como objetivo analisar a ocorrência, a morfometria e o crescimento relativo da espécie no litoral do estado de São Paulo. Sendo assim, foram tomadas e avaliadas 46 medidas morfométricas corporais. Para verificar se havia diferenças significativas das proporções corpóreas entre machos e fêmeas, foi aplicado o teste “t de Student” e o teste de “Wilcoxon Rank”, conforme a distribuição da normalidade dos dados. Para avaliar a relação entre os caracteres morfométricos durante o crescimento dos indivíduos, foram ajustadas regressões lineares entre o logaritmo do comprimento total e o logaritmo de cada uma das variáveis, estimando-se o coeficiente alométrico (b); sendo b=1 (isometria), b>1 (alometria positiva) e b<1 (alometria negativa). Por último, foi verificado se havia diferença significativa do coeficiente alométrico (b) entre machos e fêmeas por meio de uma análise de covariância. A amostra analisada foi composta por 72 fêmeas de 237 a 470 mm e 33 machos de 236 a 380 mm. Os indivíduos foram capturados em substrato arenoso, sendo que não estiveram presentes indivíduos neonatos provavelmente pelo local de captura e seletividade da rede. Diferenças significativas foram encontradas na comparação das proporções corpóreas de machos e fêmeas, exceto para a região do espiráculo. As regressões lineares das variáveis logaritmizadas mostraram presença de isometria em 39,5%, alometria positiva em ...

Diversidade e distribuição de siris (Decapoda: Brachyura: Portunidae) e dinâmica populacional de Callinectes ornatus no litoral norte de São Paulo

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Dinâmica populacional do camarão Sicyonia dorsalis (Crustacea: Penaeoidea) no litoral de Cananéia, sul do estado de São Paulo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Assessment of reproductive capacity in females of Smith, 1869 (Brachyura, Portunoidea) during a period of high reproductive activity

The reproductive capacity of the swimming crab Callinectes danae Smith, 1869 was assessed based on the reproductive investment (RI) of ovigerous females and the gonadosomatic index (GI) of non-ovigerous adult females. Crabs were collected in June 2009 with a shrimp fishing boat at Ubatuba (23° 26′S 45° 02′W) São Paulo, Brazil. Overall, 191 adult females were analyzed, of which 108 were ovigerous and 83 non-ovigerous. The size of ovigerous females ranged from 54.5 to 79.8 mm carapace width (CW) and non-ovigerous females ranged from 56.0 to 80.9 mm CW. RI values did not differ among the size classes (ANOVA, p > 0.05), with an overall mean of 15.8%. The same occurred with the Gonadossomatic index for non-ovigerous females, for which the mean value was 11.7%. The regression between the dry weight of the egg mass and the dry weight of the crab (Student’s t, p = 0.25; ttab = 1.66; tcal = 0.66) indicated an isometric relationship for the variables analyzed. The simultaneous occurrence of gonadal maturation and embryonic development in ovigerous females suggests that these crabs may spawn at least twice in the same breeding season and reveals the need for evaluation of the allocation of energy in subsequent spawns.

Can the pattern of juvenile recruitment and population structure of the speckled swimming crab Arenaeus cribrarius (Decapoda: Brachyura) be determined by geographical variations?

This study evaluated the effect of environmental stimuli and selective pressures in different geographical areas along a latitudinal gradient, on the juvenile recruitment, population structure, and sex ratio of the speckled swimming crab Arenaeus cribrarius. Samples were collected monthly during 1 year in three locations along the Brazilian coast: Macaé, state of Rio de Janeiro (MAC, 22°47′ S, 41°45′ W); Ubatuba, São Paulo (UBA, 23°27′ S, 44°58′ W); and São Francisco do Sul, Santa Catarina (SFS, 26°08′ S, 48°34′ W). The specimens of A. cribrarius were identified, counted, sexed, and measured for maximum carapace width (CW). The largest juvenile found was in UBA (47.7 ± 1.36 mm); and the largest adult females and males in MAC (74.26 ± 0.93 and 77.04 ± 0.79 mm, respectively). Recruitment in MAC was continuous, whereas in UBA and SFS, recruitment showed seasonal characteristics. The sex ratio was skewed toward females only in UBA; in MAC and SFS, males and females were present in equal proportions. These results indicate that geographical variations can cause differences in the recruitment and population structure of A. cribrarius. These regional differences call attention to the necessity for improved management plans and control of shrimp fishing, which can affect population patterns such as juvenile recruitment, population structure and life history of the target species and species that are caught in bycatch from shrimping, such as the swimming crab A. cribrarius.

Biologia populacional do camarão-ferrinho Rimapenaeus constrictus (Stimpson, 1874) (Decapoda: Penaeoidea) na região de Cananéia, litoral sul do estado de São Paulo

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Assessment of reproductive capacity in females of Callinectes danae Smith, 1869 (Brachyura, Portunoidea) during a period of high reproductive activity

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Slipper lobsters (Scyllaridae) off the southeastern coast of Brazil: relative growth, population structure, and reproductive biology

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

A dissipative Fermi-Ulam model under two different kinds of dissipation

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)