6). Fecundity was significantly higher |$(P = 0.001) \ $| in ovigerous females occupying heavier shells |$( <\rm>\gt 3.0 \ <\rm>)$|? . Significant differences |$(P \lt 0.05)$| were registered in fecundity of ovigerous females of different sizes. The number of eggs produced by ovigerous females measuring more than 3.1-mm SL was higher |$(P = 0.001)$| than the fecundity of those females measuring 1.8- to 3.0-mm SL. In relation to the shell species, the fecundity of the ovigerous females in L. nassa and P. auritula shells (the larger ones) was not significantly different, nor was that of the ovigerous females occupying C. atratum and M. nodulosa shells. However, the number of eggs produced by the ovigerous females inhabiting P. auritula shells was significant higher |$(P = 0.001)$| than the fecundity of those in C. atratum and M. nodulosa.
When it comes to the size of individuals, the fresh new fecundity of ovigerous females from similar designs (step 3.0- to help you 4.5-mm SL) occupying L. nassa and you can P. auritula shells wasn’t notably some other |$(P = 0.228)$|? , as the fecundity off ovigerous females measuring dos.0- to three.0-mm SL inhabiting C. atratum was somewhat greater than that people of your exact same proportions inside the M. nodulosa shells.
Discussion
The newest P. tortugae population degree revealed a leading and you can continuing reproductive passion on Anchieta Isle. This new fecundity filed is actually homogeneous all year long, and the low variability joined was maybe about funding job (shells) and you may differences in creature size. Typically, P. tortugae fecundity, eggs diameter, and you will egg regularity shown a tendency to improve having expanding SL.
This is informed me by the existence period of P
The fresh bimodality sizes-frequency delivery (complete and month-to-month) found in the ovigerous females’ populace was unusual and will reflect recruitment pulses or behavioral variations ( Diaz and you may Conde, 1989). tortugae that happens during a period of 2 yrs, that have obvious continuity inside private gains. The second level sizes-regularity shipment regarding the huge dimensions classes corresponded in order to a powerful recruitment of individuals throughout the next 12 months from existence, and that belonged into very first top in proportions-volume shipping in the earlier year, and so on ( Mantelatto and you can Sousa, within the push).
According to research by the shorter size of ovigerous women seized (step 1.8 mm out-of SL), we believe one intimate readiness might occur prior to on the lifetime stage of P. tortugae here. Predicated on Lancaster (1990), the presence of quick ovigerous ladies often means the newest adaptation away from the new varieties to regional layer accessibility primarily whenever enough shells was not available. Wada ainsi que al. (1995) raised the hypothesis from precocious reproductive invention when sufficient shells was scarce.
In spite of the dilemmas among Pagurus, Paguristes, together with “Pylopagurus-like” varieties (look for addition), a comparative research of fecundity are conducted. Brand new fecundity registered to possess P. tortugae to the Anchieta Area was less than you to definitely claimed to other diogenid hermit crabs (to have an assessment, see Dining table We into the Mantelatto and you may Garcia, 1999), and also for that it variety read because of the Negreiros-Fransozo mais aussi al. (1992). This particular fact could be associated with the new interspecific competition about read town, where P. tortugae communicates with other hermit varieties ( Mantelatto and you can Garcia, 2001). In addition, we might think that the low fecundity from the kinds taken place as a purpose of the lower sized P. tortugae ladies than the almost every other diogenids cited, as well as in reference to the people examined by Negreiros-Fransozo et al. (1992).
A variation into the number of egg is seen from inside the exact same proportions class https://datingranking.net/nl/ethiopianpersonals-overzicht/, probably indicating something out-of multiple spawning inside exact same reproductive year ( Ameyaw-Akumfi, 1975; Fotheringham, 1976; Varadara, 1982; Mantelatto and you may Fransozo, 1997; Mantelatto and you may Garcia, 1999). This adaptation inside the fecundity by proportions class is actually influenced either by what amount of spawns in identical reproductive years or by useless cover occupancy. The reduced fecundity noticed in many people happen just like the a features of your own visibility of extremely more youthful ovigerous females believed is spawning for the first time. Predicated on Somerton and you can Meyers (1983), these primiparous lady develop a lowered quantity of egg than just multiparous of them. The bimodality out of inhabitants design aids so it hypothesis.