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)$| than the fecundity of those in C. atratum and M. nodulosa.
In terms of the dimensions of the individuals, the new fecundity out-of ovigerous ladies regarding comparable products (3.0- in order to cuatro.5-mm SL) occupying L. nassa and you may P. auritula shells was not significantly different |$(P = 0.228)$|? , while the fecundity away from ovigerous ladies measuring dos.0- to three.0-mm SL inhabiting C. atratum try significantly greater than regarding the individuals of exact same size in the M. nodulosa shells.
Dialogue
The fresh P. tortugae people studies shown a leading and you may continuing reproductive hobby on Anchieta Area. The fresh fecundity filed try homogeneous throughout every season, additionally the reduced variability registered is maybe linked to money community (shells) and you will differences in creature dimensions. As a whole, P. tortugae fecundity, eggs diameter, and you will egg volume demonstrated a propensity to improve which have growing SL.
The new bimodality in proportions-frequency shipments (complete and you can monthly) based in the ovigerous females’ population are uncommon that will reflect recruitment pulses otherwise behavioural distinctions ( Diaz and you can Conde, 1989)
This is told me by the existence course from P. tortugae that happens over a period of 24 months, which have obvious continuity in personal gains. The following height in proportions-regularity shipment from the large dimensions kinds corresponded in order to a powerful employment of men and women about next year off lives, and therefore daf çalışıyor belonged on earliest height in dimensions-volume shipment in the previous season, and stuff like that ( Mantelatto and you will Sousa, within the press).
In line with the reduced size of ovigerous people caught (step one.8 mm off SL), we believe one intimate readiness could happen earlier in the lifetime duration from P. tortugae in this region. Centered on Lancaster (1990), the clear presence of short ovigerous people often means the new version regarding brand new kinds in order to local cover availability mostly whenever sufficient shells is unavailable. Wada ainsi que al. (1995) raised the hypothesis out-of precocious reproductive advancement when adequate shells was scarce.
In spite of the dilemmas one of many Pagurus, Paguristes, as well as the “Pylopagurus-like” types (come across addition), a relative study of fecundity try conducted. The new fecundity recorded to have P. tortugae into Anchieta Area try lower than one advertised for other diogenid hermit crabs (to possess an evaluation, discover Dining table I within the Mantelatto and you will Garcia, 1999), as well as so it variety studied by the Negreiros-Fransozo mais aussi al. (1992). This reality may be linked to the brand new interspecific race from the analyzed city, where P. tortugae communicates with other hermit kinds ( Mantelatto and you can Garcia, 2001). Also, we could possibly assume that the lower fecundity of the types happened as the a purpose of the lower size of P. tortugae people than the other diogenids quoted, and also in relation to the people learnt of the Negreiros-Fransozo mais aussi al. (1992).
A version inside the level of eggs are seen within the exact same size category, most likely proving a system out of several spawning for the same reproductive seasons ( Ameyaw-Akumfi, 1975; Fotheringham, 1976; Varadara, 1982; Mantelatto and you will Fransozo, 1997; Mantelatto and Garcia, 1999). It adaptation inside fecundity from the size category was swayed both because of the the amount of spawns in the same reproductive years otherwise by useless cover occupancy. The reduced fecundity present in some people takes place because a purpose of visibility regarding very younger ovigerous female assumed are spawning the very first time. According to Somerton and you can Meyers (1983), this type of primiparous people establish a lower life expectancy amount of egg than simply multiparous of those. The brand new bimodality regarding inhabitants framework supporting it hypothesis.