Fernando L. Yards. Mantelatto, Vera F. Alarcon, Renata B. Garcia, Egg Production Procedures of your Tropical Hermit Crab Paguristes Tortugae out of Brazil, Record from Crustacean Biology, Frequency 22, Topic 2, 1975-99990246
The aim of the present study was to characterize the total and seasonal fecundity of the hermit crab Paguristes tortugae as well as the influence of shell type on fecundity using the morphometric relationship. Ovigerous females were collected monthly from January to December, 1998, in the infralittoral region of Anchieta Island. Samplings were performed using SCUBA. The hermit crabs and the gastropod shells were measured. Hermit wet weight and shell dry weight were recorded. For the fecundity analysis, only ovigerous females with the eggs in the early phase of development were selected. The number of eggs carried by individuals of several sizes (shield length), condition of development, and egg size were determined. A high percentage (%) of ovigerous females with eggs in the early phase of development were captured, with a low frequency (4.29%) of females with eggs in the final stage of development. Size-frequency distribution during the months showed two peaks in the ovigerous female population (2.5 to 3.4 mm and 4.0 to 5.4 mm of SL). |$ <\rm>\pm <\rm>$| fecundity was |$132 \pm 102$| eggs and tended to increase with increasing SL. No significant difference in fecundity occurred among the various seasons of the year. The results showed continuous and elevated reproduction of P. tortugae, with a high reproductive potential for the population. The pattern of the frequency distribution of ovigerous females tending to bimodality may be characteristic of a population with a two-year life cycle. Considering the four shells most occupied by P. tortugae (Pisania auritula, Cerithium atratum, Morula nodulosa, and Leucozonia nassa), the highest fecundity was observed for ovigerous females occupying larger shells (P. auritula and L. nassa). The reproductive aspects of P. tortugae were related to strategies developed to compensate for interspecific competition, i.e., high and continuous reproductive effort, early maturity, low fecundity, and larger eggs produced.
Education towards the reproductive steps off Anomura was in fact eliciting expanding demand for look at the fact that hermit crabs depict an interesting class of a physiological and you can evolutionary view ( Mantelatto and you can Garcia, 1999). This group constitutes over 800 species of this new hermit crabs worldwide and contains been through considerable enhance ( Ingle, 1993).
Hermit crabs portray a significant portion of the of many intertidal and modestly strong benthic communities, in which they gamble a crucial role throughout the marine system ( Fransozo and Mantelatto, 1998). However, partners studies have become conducted on the lives record otherwise reproductive environment from hermit crabs weighed against most other decapods.
Fecundity is a vital parameter within the crustaceans, among others, to own determining the fresh new reproductive possible regarding a types and/otherwise of your stock measurements of a populace ( Mantelatto and you will Fransozo, 1997), possibly explaining the latest reproductive changes so you can ecological criteria ( Sastry, 1983). Hermit crabs specifically, while they live in gastropod shells, pay for a chance to investigation the new communications https://datingranking.net/nl/iamnaughty-overzicht anywhere between capital and you can reproductive method. Considering Wilber (1989), a great woman’s cover could affect the girl reproduction by the choosing if or not otherwise maybe not she gets ovigerous and you can/otherwise limiting the number of eggs produced. So it journalist considered numerous aspects of the fresh new cover-size/breeding relationships, particularly concerning differences in eggs production in terms of brand new varieties, size, regularity, and you can pounds of one’s layer occupied.
Eggs Manufacturing Procedures of the Tropical Hermit Crab Paguristes Tortugae off Brazil
On top of that, about three groups of hermit crab in particular (we.elizabeth., the latest genera Pagurus and you will Paguristes, as well as the “Pylopagurus-like” species), was a difficult class to study due to the fact of many types try recognized regarding one or several localities, and some still-undescribed varieties are known to occur in the location, ultimately causing significant identity difficulties certainly experts and nonspecialists similar ( Hendrickx and you will Harvey, 1999). Paguristes tortugae Schmitt, 1933, is actually a fairly prominent varieties delivered throughout the West Atlantic of Fl to Brazil (once the far southern because Santa Catarina State) ( Rieger and you may Giraldi, 1997; Melo, 1999). In spite of the pair records available on the overall biology regarding pagurids, P. tortugae might have been apparently well studied (pick Mantelatto and you can Sousa, within the push, to possess comment).