Obligatory hibernation for completion of vitellogenesis in the lizard <i>Lacerta vivipara</i> J.

Gavaud, Jacqueline

doi:10.1002/jez.1402250307

Cited by 26 publications

(11 citation statements)

References 28 publications

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“…Hedgecock et al (1978) also reported a marked lack of seasonality in reproductive events of lobsters maintained in uniform thermal regimes (10-15°C) and a similar requirement for a period of low winter temperature has been demonstrated in several species of vertebrates and invertebrates, including lizards, isopods, insects and crayfish (Aiken, 1969;Gavaud, 1983;Madhaven and Shribbs, 1981 ;Saunders, 1976;Williams, 1956;Williams and Adkisson, 1964).…”

Section: Temperaturementioning

confidence: 89%

Environmental intervention in the reproductive process of the American lobster,Homarus americanus

Waddy

Aiken

1992

Invertebrate Reproduction & Development

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The efficient culture of an animal requires a reliable year-round supply of seed. However, in most species knowledge is insufficient for the degree of broodstock control required to schedule seed production throughout the year. Although it has been relatively easy to identify the regulatory parameters in some species, in many others it has been difficult. In the American lobster ( H o m m ammicanus), controlling mechanisms are complex: responses to temperature and photoperiod vary with environmental history and season, and shifting the onset of a temperature increase by only a few days can produce entirely different responses. After two decades of experimental work, we have finally developed a broodstock system that produces synchronous and predictable spawning as required. Two strategies are used to produce year-round seed from a stock that normally spawns in July: (1) spawning is achieved throughout the winter and spring (late JanuaryJune) by inducing spawning with unseasonably high temperature (13°C) and short photophases (LD 8: 16); and (2) spawning is achieved through the late summer and autumn (August-December) by delaying spawning with low temperatures (1 -2 "C) .

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Section: Temperaturementioning

confidence: 89%

Environmental intervention in the reproductive process of the American lobster,Homarus americanus

Waddy

Aiken

1992

Invertebrate Reproduction & Development

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“…The lizards were removed from this chamber and placed in terraria after 3 months (males) or 4 months (females) of hibernation. Such hibernation conditions allow normal vitellogenesis of females and normal copulatory activity of males in the month following hibernation (Gavaud, 1983;Heulin, unpubl. obs.).…”

Section: Materials and Methods Animalsmentioning

confidence: 98%

“…Each terrarium (30 ϫ 20 ϫ 20 cm) was equipped with a shelter, dishes of food and water, and a 40W bulb that provided heat for 6 h/day. Under the rearing conditions described above, completion of vitellogenesis and the onset of ovulation occur about 1 month after the end of hibernation (Gavaud, 1983;Heulin, unpubl. obs.).…”

Section: Materials and Methods Animalsmentioning

confidence: 98%

Development of the uterine shell glands during the preovulatory and early gestation periods in oviparous and viviparous Lacerta vivipara

Heulin

Stewart

Surget‐Groba

et al. 2005

Journal of Morphology

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The evolutionary process leading to the emergence of viviparity in Squamata consists of lengthening the period of egg retention in utero coupled with marked reduction in the thickness of the eggshell. We used light microscopy and scanning electron microscopy to study uterine structure during the reproductive cycle of oviparous and viviparous females of the reproductively bimodal Lacerta vivipara. We compared the structure of the uterine shell glands, which secrete components of the eggshell, during preovulatory and early gestation phases of the reproductive cycle and also compared histochemistry of the eggshells. The uterine glands of both reproductive forms undergo considerable growth within a period of a few weeks during folliculogenesis and vitellogenesis preceding ovulation. The majority of the proteinaceous fibers of the shell membrane are secreted early in embryonic development and the uterine glands regress shortly thereafter. This supports previous observations indicating that, in Squamata, secretion of the shell membrane occurs very rapidly after ovulation. The most striking differences between reproductive modes were larger uterine glands at late vitellogenesis in oviparous females, 101 microm compared to 60 microm in viviparous females, and greater thickness of the shell membrane during early gestation in oviparous females (52-73 microm) compared to viviparous females (4-8 microm). Our intraspecific comparison supports the conclusions of previous studies that, prior to ovulation, the uterine glandular layer is less developed in viviparous than in oviparous species, and that this is the main factor accounting for differences in the thickness of the shell membrane of the two reproductive forms of squamates.

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“…Large windows provided natural light for about 12 h day -1 . In order to elicit reproduction and synchronize the reproductive cycles, the lizards were overwintered in the laboratory using a standard protocol (Gavaud, 1983;Heulin et al, 2005). On 1 October, lizards were placed in small boxes containing damp sand and wet moss, and these boxes were placed in a dark chamber (brand Liebherr, Dortmund, Germany) that was cooled progressively from 10 to 4°C during the first week, and then maintained at a constant 4°C thereafter.…”

Section: Animal Husbandrymentioning

confidence: 99%

Influence of reproductive mode on metabolic costs of reproduction: insight from the bimodal lizard Zootoca vivipara

Foucart

Lourdais

DeNardo

et al. 2014

Journal of Experimental Biology

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Examination of the selective forces behind the transition from oviparity to viviparity in vertebrates must include an understanding of the relative energy costs of the two reproductive modes. However, interspecific comparisons of reproductive mode are confounded by numerous other inherent differences among the species. Therefore, we compared oxygen consumption, as a reflection of energy costs, during reproduction in oviparous and viviparous females of the reproductively bimodal lizard Zootoca vivipara (Jaquin 1787). Female oxygen consumption progressively increased over the course of reproduction, peaking just prior to parition when it was 46% (oviparous form) and 82% (viviparous form) higher than it was at the pre-reproductive stage. Total increase in oxygen consumption (TIOC) during the pre-ovulation period was not different between the reproductive modes. Conversely, post-ovulation TIOC was more than three times higher in viviparous females, reflecting a dramatic increase in embryonic metabolism as well as maternal metabolic costs of pregnancy (MCP). MCP accounted for 22% of total metabolism in viviparous females, whereas it was negligible in oviparous females. Our results demonstrate that egg retention through the first third of development, as is typical of most oviparous squamates, entails minimal maternal energy demand, while extending retention imposes much greater metabolic constraints. Selection for transition from oviparity to viviparity must therefore provide benefits that outweigh not only the added burden associated with prolonged embryonic retention, but also the substantial additional energy costs that are incurred.

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Obligatory hibernation for completion of vitellogenesis in the lizard Lacerta vivipara J.

Cited by 26 publications

References 28 publications

Environmental intervention in the reproductive process of the American lobster,Homarus americanus

Environmental intervention in the reproductive process of the American lobster,Homarus americanus

Development of the uterine shell glands during the preovulatory and early gestation periods in oviparous and viviparous Lacerta vivipara

Influence of reproductive mode on metabolic costs of reproduction: insight from the bimodal lizard Zootoca vivipara

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