Abstract:ABSTRACT. This study analyses some reproductive aspects of Por/unus spinimanus Latreille, 1819, a crab usually commercialized in Ubatuba region. Monthly otter-trawl collections were taken fortwo years along the northern coast of Sao Paulo State, Brazil. The reproductive period was studied based on the frequency of ovigerous females in the population along the year; the frequency of physiologically mature swimming crabs and the type of spawn. The condition of development of ovigerous females ovary was associate… Show more
“…The reproductive pattern at Perequê-açu beach was classified as Seasonal Continuous (according to PINHEIRO & TERCEIRO, 2000), corroborating the pattern found in the congener A. patagoniensis (ALVES & PEZZUTO, 1998a), in which both species occurred in subtropical climate areas. The reproductive pattern registered in this study had been described to other Brachyura from the north shore of the state of São Paulo: Callinectes danae Smith, 1869; Portunus spinimanus Latreille, 1819; Callinectes ornatus Ordway, 1863 and Arenaeus cribrarius (Lamarck, 1818) (COSTA & NEGREIROS-FRANSOZO, 1998;SANTOS & NEGREIROS-FRANSOZO, 1999;MANTELATTO & FRANSOZO, 1999;PINHEIRO & TERCEIRO, 2000, respectively). Generally, Brachyura crustaceans from temperate areas present seasonal reproduction, which occurs in the hottest seasons of the year (WARNER, 1977;ASAKURA & KIKUCHI, 1984), while crabs from tropical and subtropical regions have a continuous reproduction throughout the year, usually in approximate rates (SASTRY, 1983).…”
The Pinnotheridae family is one of the most diverse and complex groups of brachyuran crabs, many of them symbionts of a wide variety of invertebrates. The present study describes the population dynamics of the pea crab Austinixa aidae (Righi, 1967), a symbiont associated with the burrows of the ghost shrimp Callichirus major (Say, 1818). Individuals (n = 588) were collected bimonthly from May, 2005 to September, 2006 along a sandy beach in the southwestern Atlantic, state of São Paulo, Brazil. Our data indicated that the population demography of A. aidae was characterized by a bimodal size-frequency distribution (between 2.0 and 4.0 mm and between 8.0 and 9.0 mm CW) that remained similar throughout the study period. Sex ratio does not differ significantly from 1:1 (p > 0.05), which confirms the pattern observed in other symbiontic pinnotherids. Density values (1.72 ± 1.34 ind. • ap.-1) are in agreement with those found for other species of the genus. The mean symbiosis incidence (75.6%) was one of the highest among species of the Pinnotheridae family, but it was the lowest among the three studied species of the genus. Recruitment pattern was annual, beginning in May and peaking in July, in both years, after the peak of ovigerous females in the population (from March to May). Our findings describe ecological and biological aspects of A. aidae similar to those of other species of this genus, even from different geographic localities.
“…The reproductive pattern at Perequê-açu beach was classified as Seasonal Continuous (according to PINHEIRO & TERCEIRO, 2000), corroborating the pattern found in the congener A. patagoniensis (ALVES & PEZZUTO, 1998a), in which both species occurred in subtropical climate areas. The reproductive pattern registered in this study had been described to other Brachyura from the north shore of the state of São Paulo: Callinectes danae Smith, 1869; Portunus spinimanus Latreille, 1819; Callinectes ornatus Ordway, 1863 and Arenaeus cribrarius (Lamarck, 1818) (COSTA & NEGREIROS-FRANSOZO, 1998;SANTOS & NEGREIROS-FRANSOZO, 1999;MANTELATTO & FRANSOZO, 1999;PINHEIRO & TERCEIRO, 2000, respectively). Generally, Brachyura crustaceans from temperate areas present seasonal reproduction, which occurs in the hottest seasons of the year (WARNER, 1977;ASAKURA & KIKUCHI, 1984), while crabs from tropical and subtropical regions have a continuous reproduction throughout the year, usually in approximate rates (SASTRY, 1983).…”
The Pinnotheridae family is one of the most diverse and complex groups of brachyuran crabs, many of them symbionts of a wide variety of invertebrates. The present study describes the population dynamics of the pea crab Austinixa aidae (Righi, 1967), a symbiont associated with the burrows of the ghost shrimp Callichirus major (Say, 1818). Individuals (n = 588) were collected bimonthly from May, 2005 to September, 2006 along a sandy beach in the southwestern Atlantic, state of São Paulo, Brazil. Our data indicated that the population demography of A. aidae was characterized by a bimodal size-frequency distribution (between 2.0 and 4.0 mm and between 8.0 and 9.0 mm CW) that remained similar throughout the study period. Sex ratio does not differ significantly from 1:1 (p > 0.05), which confirms the pattern observed in other symbiontic pinnotherids. Density values (1.72 ± 1.34 ind. • ap.-1) are in agreement with those found for other species of the genus. The mean symbiosis incidence (75.6%) was one of the highest among species of the Pinnotheridae family, but it was the lowest among the three studied species of the genus. Recruitment pattern was annual, beginning in May and peaking in July, in both years, after the peak of ovigerous females in the population (from March to May). Our findings describe ecological and biological aspects of A. aidae similar to those of other species of this genus, even from different geographic localities.
“…Less than 500 km to the south, Santos and Negreiros-Fransozo (1999) reported the presence of ovigerous females of A. spinimanus in all months, during two years of collection. Branco et al (2002), in southern Brazil, also reported that ovigerous females were continuously present.…”
Section: Population Traits Of Achelous Spinimanusmentioning
confidence: 97%
“…All individuals obtained were grouped in the following demographic categories: adult males, adult females, ovigerous females, and juveniles (checked by the adherence of the abdomen to the thoracic sternites and the stage of the gonads, which are thin and translucent in juveniles). Four developmental stages were characterized in males and females based on size, shape and color of the gonads: immature -IM (no differentiated gonads), rudimentary -RU (gonads are recognized only by magnifying on males and look filamentous, thin and with pale yellow color on females), developing -ED (on males, the gonads are visible in the anterolateral region of the abdominal cavity and the vas deferent can be divided in two different regions, the front one being thinner; on females beginning of ovary maturation with yellow color and the connection between right and left trumpet are clear), and developed -DE (on males, the gonad reaches its highest development, and the vasa deferentia can be clearly divided in front, median and back; females have bright orange ovary which fills almost the whole thoracic cavity) (adapted by Santos and Negreiros-Fransozo, 1999; illustrative photos available on Mantelatto, 1995).…”
“…The presence of spermatophores before the pubertal molt was described for the portunid Arenaeus cribrarius (Lamarck, 1818) (Pinheiro and Fransozo, 1998), which suggests that physiological maturity could be reached before morphological maturity in this family. The physiological maturation of the male reproductive system was studied macroscopically in some species of Portunidae, with respect to color and the volume occupied by the organ in the cephalothoracic cavity (Costa and Negreiros-Fransozo, 1998;Santos and Negreiros-Fransozo, 1999;Mantelatto and Fransozo, 1999). Other criteria also used to determine physiological maturity are the gonadosomatic (GSI) and hepatosomatic (HSI) indices (Mantelatto, 1995), in addition to histological techniques (Johnson, 1980).…”
-This study describes the histology and histochemistry of the male reproductive system in Callinectes ornatus, comparing juvenile and adult developmental stages. We also analyzed changes in the gonadosomatic (GSI) and hepatosomatic (HSI) indices, and the weights of the testis and vas deferens during the development. The results showed that all stages, beginning with the juvenile (JUV), through developing (DEV) and mature (MAT) adult males of C. ornatus produce sperm and spermatophores. During development, testicular lobes showed the same characteristics of production and release of sperm into the seminiferous duct. The vas deferens showed little histological and histochemical change in the epithelium in juvenile and adult males. The differences consisted of the larger amount of secretion in MAT males compared to JUV and DEV ones. The chemical composition of the seminal fluid was similar, but MAT males produced a more homogeneous secretion. Morphological and physiological maturation are not synchronized in C. ornatus, since JUV males produced spermatophores similar to those in DEV and MAT males. However, these JUV are not yet able to reproduce, since they still have the abdomen attached to the cephalothoracic sternum. The increase of the GSI during development was significant for MAT males, and is related to the production of sufficient volume of seminal fluid to form the sperm "plug" in the female seminal receptacle. The HSI decreased from DEV to MAT adult stages, indicating that reserves from the hepatopancreas are used to develop the reproductive system after the pubertal molt.
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