Fernando L. M. Mantelatto, Vera F. Alarcon, Renata B. Garcia, Eggs Production Methods of your own Tropical Hermit Crab Paguristes Tortugae out of Brazil, Journal away from Crustacean Biology, Frequency twenty-two, Situation dos, 1975-99990246
Conceptual
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.
Knowledge with the reproductive procedures out-of Anomura was basically eliciting increasing interest in view of the fact that hermit crabs show an enthusiastic interesting classification regarding a physiological and you may evolutionary viewpoint ( Mantelatto and you may Garcia, 1999). This group constitutes over 800 types of the latest hermit crabs around the world and it has gone through big revise ( Ingle, 1993).
Eggs Development Procedures of one’s Warm Hermit Crab Paguristes Tortugae regarding Brazil
Hermit crabs portray a significant part of the of many intertidal and you may modestly strong benthic communities, where they play an important role on marine food chain ( Fransozo and Mantelatto, 1998). Nonetheless, couple research has been presented on lives record otherwise reproductive environment of hermit crabs compared with most other decapods.
Fecundity is an important parameter within the crustaceans, among others, having determining the latest reproductive prospective away from a species and/otherwise of your stock measurements of a populace ( Mantelatto and Fransozo, 1997), possibly outlining the fresh new reproductive adjustment so you’re able to environmental requirements ( Sastry, 1983). Hermit crabs specifically, as they inhabit gastropod shells, pay for an opportunity to study brand new communications between capital and you can reproductive approach. Based on Wilber (1989), good female’s cover could affect her breeding by the deciding whether otherwise perhaps not she gets ovigerous and you can/otherwise limiting exactly how many egg lead. It author considered numerous regions of the newest shell-size/reproduction matchmaking, specifically regarding the differences coffee meets bagel tanışma uygulamaları in eggs creation when considering the fresh varieties, dimensions, volume, and weight of your own shell filled.
As well, around three categories of hermit crab particularly (i.age., the genera Pagurus and you will Paguristes, in addition to “Pylopagurus-like” species), was indeed a difficult group to review given that of several types is actually recognized away from singular otherwise a number of localities, and several however-undescribed varieties are recognized to occur in the spot, leading to big identification trouble one of specialist and you may nonspecialists the same ( Hendrickx and you will Harvey, 1999). Paguristes tortugae Schmitt, 1933, try a comparatively common varieties distributed in the Western Atlantic of Fl so you can Brazil (due to the fact far south due to the fact Santa Catarina State) ( Rieger and you will Giraldi, 1997; Melo, 1999). Despite the pair documentation available on the entire biology out of pagurids, P. tortugae might have been apparently well studied (discover Mantelatto and you can Sousa, in drive, getting remark).