6). Fecundity was significantly higher |$(P = 0.001) \ $| in ovigerous females occupying heavier shells |$( \gt 3.0 \ )$|? . Significant differences |$(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)$| than the fecundity of those in C. atratum and M. nodulosa.
With regards to the size of the individuals, the newest fecundity away from ovigerous ladies from comparable items (step 3.0- so you’re able to cuatro.5-mm SL) consuming L. nassa and P. auritula shells wasn’t notably various other |$(P = 0.228)$|? , because the fecundity of ovigerous girls calculating dos.0- to three.0-mm SL inhabiting C. atratum was somewhat more than compared to the people of your exact same size in the M. nodulosa shells.
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Brand new P. tortugae people studies revealed a high and you can continuous reproductive interest on Anchieta Island. Brand new fecundity submitted try homogeneous year round, together with low variability entered was possibly connected with financing job (shells) and you can differences in creature size. Overall, P. tortugae fecundity, eggs diameter, and you can eggs volume showed a tendency to improve having expanding SL.
This will be informed me by lifetime cycle out of P
The latest bimodality sizes-volume shipment (complete and you will monthly) found in the ovigerous females‘ populace is actually strange and may even mirror employment pulses or behavioural variations ( Diaz and you will Conde, 1989). tortugae that happens during a period of a couple of years, with clear continuity in the individual increases. The next level in size-frequency delivery in the big size groups corresponded to a powerful recruitment of individuals regarding next seasons off lifestyle, which belonged on the basic level in size-volume shipment in the earlier year, and stuff like that ( Mantelatto and you may Sousa, when you look at the press).
According to research by the reduced measurements of ovigerous ladies grabbed (1.8 mm of SL), we believe you to definitely intimate readiness might result prior to throughout the lives period off P. tortugae here. Considering Lancaster (1990), the current presence of quick ovigerous female often means the adaptation off the newest luxy types in order to regional layer availableness primarily whenever enough shells is not available. Wada mais aussi al. (1995) raised the hypothesis from precocious reproductive advancement when sufficient shells try scarce.
Regardless of the difficulties among the Pagurus, Paguristes, additionally the “Pylopagurus-like” varieties (pick introduction), a comparative research out-of fecundity is used. The new fecundity recorded having P. tortugae into Anchieta Island is actually lower than you to reported to other diogenid hermit crabs (getting an evaluation, look for Desk I during the Mantelatto and you will Garcia, 1999), as well as this kinds analyzed from the Negreiros-Fransozo ainsi que al. (1992). This fact can be connected with the fresh interspecific competition throughout the examined town, in which P. tortugae communicates together with other hermit varieties ( Mantelatto and you will Garcia, 2001). Furthermore, we might assume that the lower fecundity in the kinds took place while the a purpose of the low measurements of P. tortugae female compared to most other diogenids cited, plus relation to the populace learnt from the Negreiros-Fransozo et al. (1992).
A difference for the level of eggs are noticed during the exact same size classification, probably appearing a process regarding multiple spawning during the exact same reproductive season ( Ameyaw-Akumfi, 1975; Fotheringham, 1976; Varadara, 1982; Mantelatto and you may Fransozo, 1997; Mantelatto and Garcia, 1999). Which type for the fecundity by dimensions class try influenced either by the amount of spawns in identical reproductive years or by the inadequate cover occupancy. The lower fecundity present in many people takes place due to the fact a purpose of your exposure of really young ovigerous lady believed is spawning the very first time. Based on Somerton and you may Meyers (1983), such primiparous female create a reduced level of eggs than multiparous ones. The latest bimodality away from population construction supporting which theory.