Annual Ovarian Cycle in the Frog, Rana ridibunda, in Northern Greece

Kyriakopoulou-Sklavounou, P.; Loumbourdis, N. S.

doi:10.2307/1564226

Cited by 24 publications

(20 citation statements)

References 9 publications

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“…Both effects have repeatedly been found for R. temporaria (Hönig 1966;Koslowska 1971;Jörgensen 1981;Cummins 1986;Gibbons and McCarthy 1986;Kyriakopoulos-Sklavounou and Loumbourdis 1990;Joly 1991) and also other frogs [Bufo calamita clutch size only (Tejedo 1992b); Rana sylvatica (Berven 1988); Rana palustris (Resetarits and Aldridge 1988); Bufo bufo ( van Gelder 1995)], reptiles (Ji and Braña 2000;Brown and Shine 2002), gastropoda (Ito 1997) and fish (Grossman et al 2002).…”

Section: Marginal Resources: Growth or Reproduction?mentioning

confidence: 83%

Growth or reproduction? Resource allocation by female frogs Rana temporaria

Lardner

Loman

2003

Oecologia

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The decision how to allocate marginal resources to reproduction and growth can have important effects on associated life-history parameters as well as on population dynamics. In addition to showing variation among individuals in a population, such allocation rules may be either condition-dependent or fixed in different individuals. While many studies on anuran amphibians have focused on egg numbers and egg sizes in females of different sizes, virtually no data exist on the relative allocation of marginal resources to growth versus reproduction. In the laboratory, we therefore offered female common frogs ( Rana temporaria) low versus high food rations for a full reproductive cycle, and monitored their growth and later reproductive investment (egg number and egg size the following breeding season). Feeding rates had an effect both on female growth and on egg number and size. There was no trade-off found between the two forms of investment. A flexible allocation rule could not be supported as there was no significant effect of feeding rate on the relative allocation of resources to growth versus reproduction.

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Section: Marginal Resources: Growth or Reproduction?mentioning

confidence: 83%

Growth or reproduction? Resource allocation by female frogs Rana temporaria

Lardner

Loman

2003

Oecologia

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“…It should be reminded that, in all the anurans from temperate regions, where the ovarian cycle has been studied in detail (Jorgensen et al, 1986;Kyriakopolou & Lombourdis, 1990;Guarino et al, 1993), the massive recruitment of follicles to vitellogenic growth starts before hibernation and most of the vitellogenic follicles overcome winter undamaged. Conversely, in the population of B. pachypus studied by us, only few oocytes at a time were seen to start vitellogenic growth in the activity period (May-October).…”

Section: Discussionmentioning

confidence: 99%

Reproductive activity ofbombina pachypusfrom southern Italy

Guarino

Bellini

Mazzarella

et al. 1998

Italian Journal of Zoology

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Seasonal changes in gonadal morphology, secondary sexual characters, and plasma sex steroids were studied in male and female Bombina pachypus from southern Italy. In this species, frogs are active and breed from May to September. During the long breeding season, sperm were always present in the testes. However, the testes did not always exhibit all stages of spermatogenesis. In July, spermatogenesis did not exceed the stage of spermatocyte I, whereas in August it included all stages. It is possible that males use sperm originating from the preceding fall for the earliest spring matings. Throughout the breeding season, females showed many follicles in advanced or complete vitellogenesis and many atretic vitellogenic follicles. Postovulatory follicles, if any, were rare. Females laid few eggs at each oviposition. Concerning male sex steroids, testosterone was at comparable levels from May to September, and it markedly decreased in October. In females, wide variations in plasma estradiol and progesterone levels were observed only in individuals with postovulatory follicles. Emphasis is given to the prolonged and opportunistic reproductive activity of this species.

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“…This reproductive pattern differs from that of R. ridibunda, which was found to spawn twice in a breeding season in northern Greece (Kyriakopoulou-Sklavouno u and Loumbourdis, 1990). In R. epeirotica a continuous change in the number and diameter of the ovarian follicles occurs during the annual cycle and even during hibernation.…”

Section: Discussionmentioning

confidence: 64%

Female reproductive cycle of the water frog Rana epeirotica in northwestern Greece

Tsiora¹,

Kyriakopoulou-Sklavounou²

2002

Amphib Reptilia

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The reproductive cycle of female Rana epeirotica in Lake Ioannina, northwestern Greece was studied from 1998 to 1999. Young females reached sexual maturity at a weight of 26.3 g and a length of 67.2 mm. The annual cyclic changes in weight and histological composition of the ovaries showed that R. epeirotica has a single reproductive period each year. Weight changes of the oviducts followed those shown by the ovaries. A continuous change in the percentage and diameter size of the ovarian follicles through the annual cycle was found. Clutch size ranged from 600 to 2900 ova of 1.3 to 1.6 mm egg diameter. Ovarian weight, clutch size and ovum size were positively correlated to body weight. The weights of fat body and liver had a peak in August and November respectively and they both were reduced considerably during hibernation.

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Annual Ovarian Cycle in the Frog, Rana ridibunda, in Northern Greece

Cited by 24 publications

References 9 publications

Growth or reproduction? Resource allocation by female frogs Rana temporaria

Growth or reproduction? Resource allocation by female frogs Rana temporaria

Reproductive activity ofbombina pachypusfrom southern Italy

Female reproductive cycle of the water frog Rana epeirotica in northwestern Greece

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