Reproduction in a Parthenogenetic Lizard: With a Discussion of Optimal Clutch Size and a Critique of the Clutch Weight/Body Weight Ratio

Cuellar, O

doi:10.2307/2425319

Cited by 36 publications

(32 citation statements)

References 45 publications

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“…The eggs of P bocagei are retained m the oviduct for a relatively short time (Brana et al 1991) Despite this, I detected clear differences between oviductal eggs and recently laid eggs The observed vanability m oviductal eggs may be attnbutable to differences in developmental stage, and/or to absorption of water as the egg passes along the duct (sec Martin 1978, Congdon et al 1981, Cuellar 1984, Vitt et al 1985. Mean relative clutch mass (RCM), estimated on the basis of data for vivantim-laid eggs, was 0 405 This value IS similar to that previously reported by Brana et al (1991) for P muralis populations in the Basque Country in northern Spam, but considerably higher than the value of 0 334 obtained by Brana et al (1991) for populations of P bocagei in Astunas (hkewise in northern Spain) However, the maximum RCM recorded in the present study (0 613) was much higher than has been reported previously for any Podarcts speaes in the Ibenan Peninsula RCM can be considered to be a reflection of the maximum egg mass which a female is capable of carrying without lncumng unacceptable costs m terms of reduced mobihty (see Vitt and Congdon 1978, Vitt and Pnce 1982, Dunham et al 1988.…”

Section: Clutch Characteristicsmentioning

confidence: 99%

Reproductive ecology of the lacertid lizard Podarcis bocagei

Galán

1997

Ecography

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This paper presents data on aspects of the reproductive ecology of a population of Podarcis bocagei in northwestern Spain, as monitored over a two‐year period (1990–1991) Data were obtained principally on the basis of mark‐recapture experiments, but also from laboratory hatching studies Mating took place between the end of March and July During the laying period, from May to July, 8 5% of reproductive females produced three clutches, 52 1% two clutches, and 39 4% one clutch In general, single clutches were produced by small females Only a small proportion of large females produced three clutches Mean clutch size was 4 8 eggs (range 4–7) in May, 4 3 (2–6) in June and 3 9 (2–4) in July There was sigmficant variation in the mean snout‐to‐vent length (SVL) of females laying in each month of the season Both clutch size and mean single‐egg volume increased with mother's SVL There was a significant partial correlation between egg volume and clutch size when both mother's SVL and month of laying were held constant There was no significant between‐year variation in clutch size, breeding females' SVL, egg weight or relative clutch mass A delay in the timing of reproductive events in one year (1991) is attributable to adverse weather conditions during early spring Hatching occurred between July and September Hatch success (as estimated in 1989, 1990 and 1991 from natural nests at the study site) was high, ranging from 83% in 1991 to 91% in 1989 The mean SVL of female hatchlings was greater than that of male hatchlings By contrast, adult females had lower mean SVL than adult males

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Section: Clutch Characteristicsmentioning

confidence: 99%

Reproductive ecology of the lacertid lizard Podarcis bocagei

Galán

1997

Ecography

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“…comm. ), it has severe methodological problems (e.g., Martin, 1978;Cuellar, 1984). Linear measurements of clutch dimensions may have significant advantages for snakes.…”

Section: Analysis Ofmentioning

confidence: 99%

Constraints on Reproductive Investment: A Comparison Between Aquatic and Terrestrial Snakes

Shine

1988

Evolution

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Life-history theory predicts that "costs" of reproduction may be important evolutionary determinants of reproductive investment; previous studies on reptiles indicate that decrements to maternal mobility may be among the most important components of such costs. Biomechanical models suggest that reproductive investment in aquatic snakes may be constrained by the important locomotory role of the posterior part of the body during swimming: carrying eggs or offspring in this region would more seriously impair locomotory efficiency in swimming than in terrestrial lateral undulation. If this constraint is important, aquatic snakes would be expected to have lower clutch masses relative to body mass than terrestrial species and to carry the clutch in a more anterior position (commencing at the same proportion of maternal body length anteriorly, but not extending as far posteriorly). Comparisons between aquatic and terrestrial snakes of several families confirm these predictions. Phylogenetic analysis suggests that this pattern of reduced reproductive investment has evolved independently in each of the four ophidian lineages that contain marine species (acrochordids, homalopsine colubrids, laticaudid sea snakes, and hydrophiid sea snakes). Although it thus seems likely that these patterns represent adaptations to aquatic versus terrestrial life, the nature of the selective forces involved remains speculative. The hypothesis based on locomotory impairment of gravid females has better empirical support than any alternative hypothesis, as it successfully predicts modifications in the position of the clutch within the female's body, as well as overall reduced reproductive investment.

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“…It seems reasonable that stout-bodied iguanids with unusually small eggs even for iguanids (e.g., Sceloporus olivaceous) would produce more eggs per reproductive season that Cnemidophorus under most situations. In iguanids and Cnemidophorus, wet mass of individual eggs varies with female body mass and varies inversely with clutch size (Nussbaum 1981, Ferguson et al 1982, Rand 1982, Cuellar 1984). Congdon et al (1978), Smith and Fretwell (1974), Ferguson et al (1982), Nussbaum (1981), and Rand (1982) discuss the compromise be- .…”

Section: Anderson Personal Observation)mentioning

confidence: 99%

Energetics of the Lizard Cnemidophorus Tigris and Life History Consequences of Food‐Acquisition Mode

Anderson¹,

Karasov²

1988

Ecological Monographs

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Energy budgets for the wide-foraging "arthropodivorous" lizard Cnemidophorus tigris were constructed for the reproductive season using doubly labeled water measurements of field metabolic rate (FMR). Rates ofbody mass change, clutch sizes, and clutch intervals were also investigated. FMRs ofboth sexes (males, 298 J ·g-1 ·d-1 ; females, 24 7 J · g-1 • d -1 ) were greater in the reproductive season than during the postreproductive season. This was not due to differences in resting metabolism, but, instead, was due to higher activity costs during the reproductive season. Although males had signficantly higher FMR than females, males and females had similar feeding rates (as reflected by water influx rates). The ratio of energy intake to expenditure was higher in females than in males. Females produced eggs but did not grow. Large males did not grow, but smalllst-yr males similar in size to females did grow. Females laid at least two consecutive clutches during a single reproductive season; clutch interval was ~25 d. Clutch size varied with time of laying (first or second clutch), female body size, and year.We compare the reproductive energetics of C. tigris and other wide-foraging Cnemidophorus with the energetics of ambush iguanids. The wide forager C. tigris and the ambusher Uta stansburiana apparently do not differ in the proportion of the energy budget devoted to reproductive production (reproductive effort, REP). But total reproductive effort, RE., which includes metabolism associated with reproduction, is much lower in Cnemidophorus tigris.Review of the literature indicates Cnemidophorus tend to lay smaller clutches and larger eggs than iguanids, but the number of eggs laid per unit time generally equals that of most iguanids. Cnemidophorus also deposit energy into their eggs at rates almost 60% higher than ambush iguanids. We consider higher rates of production in wide foragers to be permitted by their higher rates of net energy intake while foraging, compared with most ambushers. These higher rates of production in Cnemidophorus apparently allow them either to reach a larger size than iguanids of similar age at first reproduction or to be younger than iguanids of the same size at first reproduction. Life history characters may be influenced by differences in rates of production associated with different food-acquisition modes.

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Reproduction in a Parthenogenetic Lizard: With a Discussion of Optimal Clutch Size and a Critique of the Clutch Weight/Body Weight Ratio

Cited by 36 publications

References 45 publications

Reproductive ecology of the lacertid lizard Podarcis bocagei

Reproductive ecology of the lacertid lizard Podarcis bocagei

Constraints on Reproductive Investment: A Comparison Between Aquatic and Terrestrial Snakes

Energetics of the Lizard Cnemidophorus Tigris and Life History Consequences of Food‐Acquisition Mode

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