Fernando L. Yards. Mantelatto, Vera F. Alarcon, Renata B. Garcia, Egg Manufacturing Strategies of one’s Warm Hermit Crab Paguristes Tortugae regarding Brazil, Log out of Crustacean Biology, Regularity twenty-two, Issue 2, 1975-99990246
Abstract
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 to your reproductive strategies out of Anomura were eliciting expanding interest in look at the reality that hermit crabs depict an fascinating group out of a biological and you may evolutionary view ( Mantelatto and you can Garcia, 1999). This group comprises more than 800 species of brand new hermit crabs of the globe and contains undergone considerable enhance https://datingranking.net/tr/feeld-inceleme/ ( Ingle, 1993).
Eggs Design Strategies of your own Exotic Hermit Crab Paguristes Tortugae out of Brazil
Hermit crabs depict an essential portion of the of several intertidal and you can moderately strong benthic groups, where it enjoy a crucial role about aquatic system ( Fransozo and you will Mantelatto, 1998). Still, few research has been presented towards the lifetime record otherwise reproductive ecology of hermit crabs compared with other decapods.
Fecundity is an important parameter within the crustaceans, and others, getting determining the reproductive potential regarding a variety and you will/otherwise of one’s stock measurements of a population ( Mantelatto and Fransozo, 1997), perhaps discussing this new reproductive changes so you can environmental requirements ( Sastry, 1983). Hermit crabs particularly, as they are now living in gastropod shells, pay for a way to studies brand new communications between money and you may reproductive approach. Predicated on Wilber (1989), good woman’s layer can impact their breeding by choosing whether or not or perhaps not she will get ovigerous and you may/otherwise limiting just how many eggs lead. So it copywriter noticed several regions of new shell-size/breeding dating, especially about the differences in egg development in terms of the newest species, proportions, regularity, and you will weight of your own layer occupied.
As well, three categories of hermit crab specifically (i.age., this new genera Pagurus and you may Paguristes, and also the “Pylopagurus-like” species), was basically an emotional category to learn because the of several types was understood away from only 1 otherwise a few localities, and lots of nevertheless-undescribed species are known to take place in the location, leading to significant identification troubles among gurus and you can nonspecialists the exact same ( Hendrickx and Harvey, 1999). Paguristes tortugae Schmitt, 1933, try a comparatively popular varieties marketed from the West Atlantic of Florida to Brazil (as the far southern area due to the fact Santa Catarina Condition) ( Rieger and you will Giraldi, 1997; Melo, 1999). Inspite of the pair files available on the overall biology off pagurids, P. tortugae has been seemingly well studied (pick Mantelatto and you can Sousa, inside press, having opinion).