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)$| than the fecundity of those in C. atratum and M. nodulosa.
In relation to the size of the people, new fecundity out of ovigerous ladies off comparable products (step three.0- in order to 4.5-mm SL) occupying L. nassa and you can P. auritula shells was not rather various other |$(P = 0.228)$|? , given that fecundity regarding ovigerous female calculating dos.0- to three.0-mm SL inhabiting C. atratum are significantly higher than regarding people of your exact same dimensions when you look at the Yards. nodulosa shells.
Discussion
The latest P. tortugae inhabitants education revealed a premier and persisted reproductive activity towards Anchieta Island. The brand new fecundity filed are homogeneous all year long, therefore the reasonable variability entered are maybe related to guyspy hesap silme investment industry (shells) and differences in animal size. Generally, P. tortugae fecundity, eggs diameter, and you can egg volume presented a propensity to boost with expanding SL.
The brand new bimodality in size-frequency shipments (total and you can month-to-month) based in the ovigerous females’ inhabitants was unusual and may mirror recruitment pulses otherwise behavioural distinctions ( Diaz and Conde, 1989)
This might be told me of the lives cycle of P. tortugae that occurs during a period of 2 yrs, having clear continuity inside individual progress. The following top in proportions-volume shipment in the larger size categories corresponded so you’re able to an effective recruitment of men and women from the second seasons off lives, and that belonged toward very first top in size-frequency shipment in the last season, and stuff like that ( Mantelatto and Sousa, for the press).
Based on the reduced sized ovigerous female grabbed (step one.8 mm out-of SL), we believe one to intimate readiness may possibly occur prior to in the existence duration from P. tortugae in this field. According to Lancaster (1990), the existence of brief ovigerous ladies can indicate the fresh variation of the fresh new varieties so you’re able to local shell accessibility primarily when adequate shells try not available. Wada mais aussi al. (1995) boosted the hypothesis regarding precocious reproductive advancement whenever sufficient shells try scarce.
Inspite of the issues one of the Pagurus, Paguristes, and also the “Pylopagurus-like” varieties (come across inclusion), a comparative investigation out of fecundity is conducted. The newest fecundity filed having P. tortugae to the Anchieta Isle is actually below one said to many other diogenid hermit crabs (to own an assessment, select Table We in Mantelatto and Garcia, 1999), and which kinds learnt by Negreiros-Fransozo et al. (1992). This particular fact may be related to this new interspecific competition in the studied city, where P. tortugae communicates together with other hermit species ( Mantelatto and you will Garcia, 2001). Also, we would assume that the low fecundity with the species occurred once the a purpose of the lower size of P. tortugae ladies versus other diogenids quoted, and also in reference to the population learnt from the Negreiros-Fransozo ainsi que al. (1992).
A version in number of egg is actually seen in the same dimensions class, probably exhibiting a system off several spawning inside same reproductive seasons ( Ameyaw-Akumfi, 1975; Fotheringham, 1976; Varadara, 1982; Mantelatto and you may Fransozo, 1997; Mantelatto and you will Garcia, 1999). It type in the fecundity of the dimensions classification was influenced possibly of the how many spawns in identical reproductive cycle otherwise by inadequate layer occupancy. The reduced fecundity observed in some individuals happens due to the fact a function of visibility from really more youthful ovigerous people thought to be spawning for the first time. According to Somerton and you can Meyers (1983), these types of primiparous lady develop a diminished amount of egg than simply multiparous of these. The new bimodality of people construction supporting which theory.