Reproduction Saisonnière Chez Hemilepistus Reaumuri (Audouin, 1826), Isopode Terrestre Des Zones Semi-Arides

Nasri, K.; Mocquard, J. P.; Juchault, P.; Souty‐Grosset, Catherine

doi:10.1163/156854096x00538

Cited by 29 publications

(21 citation statements)

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“…Flexible allocation to sex functions may be characteristic of hermaphroditism (Charnov 1982;Michiels 1998). The closest animal analogy to the present mechanism is perhaps the stimulation of vitellogenesis in female terrestrial isopods by contact with a conspeci¢c male a considerable time before mating (Nasri et al 1996;Caubet et al 1998). Direct mating with the receipt of an ejaculate or spermatophore stimulates oogenesis in a variety of other invertebrates (for example, Baur 1994;Yasui 1997).…”

Section: Discussionmentioning

confidence: 89%

Water–borne sperm trigger vitellogenic egg growth in two sessile marine invertebrates

Bishop

Manríquez

Hughes

2000

Proc. R. Soc. Lond. B

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A diverse array of sessile marine invertebrates mate by passive dispersal of sperm which fertilize the brooded eggs of neighbours. In two such species, a sea-mat (phylum Bryozoa) and an ascidian (phylum Chordata), vitellogenic egg growth is absent in reproductively isolated specimens, but is triggered by a water-borne factor released by conspeci¢cs. In both of these colonial, hermaphroditic species, the active factor can be removed from water by ¢ltration. The e¡ect involves self-/non-self-recognition: water conditioned by a separate subcolony of the same genetic individual does not prompt oocyte growth. In each species, allosperm move from the surrounding water to the ovary and are then stored in close association with the growing oocytes. We concluded that sperm themselves are the water-borne factor that triggers the major phase of female reproductive investment. This mechanism is, to our knowledge, previously undescribed in animals, but has parallels with the initiation of maternal investment in £owering plants following the receipt of compatible pollen. The species studied may be representative of many other aquatic invertebrates which mate in a similar way. The stimulation of egg growth by allosperm could lead to intersexual con£ict during oogenesis.

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Section: Discussionmentioning

confidence: 89%

Water–borne sperm trigger vitellogenic egg growth in two sessile marine invertebrates

Bishop

Manríquez

Hughes

2000

Proc. R. Soc. Lond. B

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“…Jassem et al, 1982, 1991Mocquard et al, 1989), les femelles de Porcellio lamellatus, vierges ou accouplées, peuvent effectuer spontanément une première mue parturielle. Contrairement à d'autres espèces telle que Hemilepistus reaumuri dont les femelles vierges isolées n'entrent qu'exceptionnellement en reproduction (Nasri et al, 1996). Ainsi chez les premières espèces, le mâle par sa présence, accélèrerait l'entrée en reproduction en favorisant le démarrage de la vitellogenèse et en réduisant le nombre de mues de croissance précédant la première mue parturielle et la durée de l'intermue préparturielle comme il a été observé chez Armadillidium vulgare (cf.…”

Section: Discussionunclassified

“…Juchault et al, 1985;Achouri & Charfi-Cheikhrouha, 2001, 2002; Hemilepistus reaumuri (Audouin & Savigny, 1826) (cf. Kacem & Rezig, 1995;Nasri et al, 1996); Porcellio olivieri (Audouin, 1826) (cf. Warburg, 1995); Porcellio laevis Latreille, 1804(cf.…”

Section: Introductionmentioning

confidence: 99%

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Caractérisation Du Cycle Reproducteur Des Femelles De Porcellio Lamellatus (Isopoda, Oniscidea) Provenant Des Berges De La Lagune De Bizerte (Tunisie)

Nasri–Ammar¹,

Khemaissia²

2010

Crustac

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The reproductive cycle of Porcellio lamellatus Budde-Lund, 1885 was studied by a breeding survey of 333 ovigerous females and females with empty marsupium, collected during June, July, and August 2006. These females were followed from the day of collection until their death. Breeding was carried out under natural conditions of temperature, photoperiod, and humidity in the laboratory. Characterization of the reproductive cycle was based on several parameters: the number of parturition moults occurring during a year cycle (

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“…Pour Hemilepistus reaumurii (H. Milne Edwards, 1840) de Fatnassa, la période de reproduction est réduite à 2 mois, de la mi-mai au mois de juillet, avec un maximum en juin (cf. Nasri et al, 1996). La variabilité dans la durée de la reproduction saisonnière a été également remarquée chez quelques espèces étudiées en Europe; elle est très courte chez Armadillidium vulgare (Latreille, 1804), plus importante chez Philoscia muscorum (Scopoli, 1763), Porcellio scaber Latreille, 1804, et Ligia oceanica (Linné, 1767).…”

Section: Conclusion Et Discussionunclassified

Stratégie De Reproduction Et De Croissance De Deux Espèces Sympatriques Du Genre Porcellionides (Isopoda, Oniscidea) De Tunisie

Charfi‐Cheikhrouha¹,

Achouri²

2006

Crustac

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The biology and population dynamics of two sympatric species of Oniscidea, Porcellionides pruinosus and P. sexfasciatus from the population of Garat Nâam (Kasserine, Tunisia) have been studied based on monthly sampling carried out from July 1996 to June 1998. P. pruinosus was more abundant on the sampling locality. Both species show a seasonal reproduction period. The population of P. pruinosus showed two distinct breeding peaks, while P. sexfasciatus exhibited only one spring breeding, from March to May. In P. pruinosus, larger ovigerous females were present during the first reproduction period, while gravidity in smaller females was restricted to the second breeding wave. Juveniles derived from different breeding waves showed remarkable differences in size. Also, a striking variability in the size of juveniles of the same age was observed between these two species. During the study period, analysis of size frequency distributions allowed the identification of 14 cohorts in each species. Three of these cohorts were followed in P. sexfasciatus, and four in P. pruinosus.The growth rate varied with developmental stage and with season. In winter, low temperature reduces the growth rate by decreasing moulting frequency, while in spring the increase in temperature induces growth. Sexual maturation of females is reached at approximately 2.5 months and at an average length of 4.23 ± 0.21 mm in P. pruinosus, and 5.5 months or 6.83 ± 0.23 mm in P. sexfasciatus.The total number of hatched eggs or embryos is positively correlated with body length of ovigerous females. In P. pruinosus, ovigerous females show distinct strategies of reproduction: the first one in spring with large females and high fecundity and fertility; the second in autumn characterized by small females and low fecundity and fertility. Reproduction strategies, K for P. sexfasciatus and r for P. pruinosus, the reproduction potential, and effort could explain the abundance of P. pruinosus at the station of Garat Nâam. Also, this difference in abundance was due to the growth difference between the two species, the presence of two breeding peaks, and a 3 ) e-mail: mohamed_achouri@voila.fr © Koninklijke Brill NV, Leiden, 2006 Crustaceana 79 (7): 843-864 Also available online: www.brill.nl 844 MOHAMED S. ACHOURI & FAOUZIA CHARFI-CHEIKHROUHA female-biased sex ratio, which was often in equilibrium in P. sexfasciatus, but which was always skewed in favour of females in P. pruinosus. RÉSUMÉLa biologie et la dynamique des populations de deux espèces sympatriques d'Oniscidea, Porcellionides pruinosus et P. sexfasciatus, ont été réalisées à partir d'un échantillonnage mensuel, effectué pendant deux années consécutives, de juillet 1996 à juin 1998, à Garat Nâam (Kasserine, Tunisie).L'analyse du cycle biologique de ces deux espèces a montré que P. pruinosus est plus abondant dans la station de récolte et que les deux espèces sont caractérisées par une reproduction saisonnière. Au cours de cette période, deux poussées reproductives distinctes ont été notées chez P. pruin...

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Reproduction Saisonnière Chez Hemilepistus Reaumuri (Audouin, 1826), Isopode Terrestre Des Zones Semi-Arides

Cited by 29 publications

References 0 publications

Water–borne sperm trigger vitellogenic egg growth in two sessile marine invertebrates

Water–borne sperm trigger vitellogenic egg growth in two sessile marine invertebrates

Caractérisation Du Cycle Reproducteur Des Femelles De Porcellio Lamellatus (Isopoda, Oniscidea) Provenant Des Berges De La Lagune De Bizerte (Tunisie)

Stratégie De Reproduction Et De Croissance De Deux Espèces Sympatriques Du Genre Porcellionides (Isopoda, Oniscidea) De Tunisie

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