The Concept of Reproductive Effort and Its Relation to the Evolution of Life Histories of Lizards

Tinkle, Donald W.

doi:10.1086/282617

Cited by 353 publications

(235 citation statements)

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“…Previous reviews of other lizards (20,21,34) report 11 species as putatively annual. However, in all species in which survivorship was quantified by the original authors (cf.…”

Section: Discussionmentioning

confidence: 99%

“…There are no examples of annual amphibians (18). Among reptiles, lizards exhibit the shortest life spans (19), although the shortest-lived are capable of longevity Ͼ1 year with multiple clutches per lifetime (20,21). However, we know very little about taxa such as chameleons, which have proved difficult to study in the field because of poor visibility in forest canopies, compounded by the secretive and cryptic behavior of the animals themselves (22).…”

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confidence: 99%

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A unique life history among tetrapods: An annual chameleon living mostly as an egg

Karsten

Andriamandimbiarisoa

Fox

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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The Ϸ28,300 species of tetrapods (four-limbed vertebrates) almost exclusively have perennial life spans. Here, we report the discovery of a remarkable annual tetrapod from the arid southwest of Madagascar: the chameleon Furcifer labordi, with a posthatching life span of just 4 -5 months. At the start of the active season (November), an age cohort of hatchlings emerges; larger juveniles or adults are not present. These hatchlings grow rapidly, reach sexual maturity in less than 2 months, and reproduce in JanuaryFebruary. After reproduction, senescence appears, and the active season concludes with population-wide adult death. Consequently, during the dry season, the entire population is represented by developing eggs that incubate for 8 -9 months before synchronously hatching at the onset of the following rainy season. Remarkably, this chameleon spends more of its short annual life cycle inside the egg than outside of it. Our review of tetrapod longevity (>1,700 species) finds no others with such a short life span. These findings suggest that the notorious rapid death of chameleons in captivity may, for some species, actually represent the natural adult life span. Consequently, a new appraisal may be warranted concerning the viability of chameleon breeding programs, which could have special significance for species of conservation concern. Additionally, because F. labordi is closely related to other perennial species, this chameleon group may prove also to be especially well suited for comparative studies that focus on life history evolution and the ecological, genetic, and/or hormonal determinants of aging, longevity, and senescence.Madagascar ͉ lizard ͉ longevity ͉ semelparity ͉ senescence

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“…Previous reviews of other lizards (20,21,34) report 11 species as putatively annual. However, in all species in which survivorship was quantified by the original authors (cf.…”

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

A unique life history among tetrapods: An annual chameleon living mostly as an egg

Karsten

Andriamandimbiarisoa

Fox

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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“…Reproductive strategy is the set of adaptations to promote the most efficient way for a population to survive under particular conditions of a certain environment (Tinkle et al, 1969;Ballinger, 1977).…”

Section: Introductionmentioning

confidence: 99%

Reproductive Strategies of Brazilian Lizards of the Genus Tropidurus Rodrigues, 1987 (Squamata, Tropiduridae) in the Temporal and Spatial

2011

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Estrategias Reproductivas de las Lagartijas Brasileñas del Género SUMMARY:Reproductive strategy is the set of adaptations that promote the most efficient way that the species will survive under the particular conditions of a determined environment. Understanding these adaptations is important and can help pinpoint populations indicator of environmental changes. Spermatogenesis is a measurable biological process of these adaptations in spatial and temporal scales. We analyzed the morphology of the testes and oviducts of the lizard species that comprise the genus Tropidurus, taking into account the geographical distribution and sympatric relations. For the analysis and the testes were removed from the middle part of the oviducts from Tropidurus etheridge, T. oreadicus, T. itambere, T. spinulosus and T. Guarani species, collected in different places in the Mato Grosso state, Brazil. The reproductive period is synchronous for males and females and occurs in September, October and November. Reproductive males were characterized. In the testes are seminiferous tubules with germ cells at different stages of spermatogenesis, with a high epithelium, at present light, free spermatozoa in the lumen and reduction of interstitial tissue. For females, the reproduction peak occurs when the oviduct epithelium is high with secretions and basal nucleus. These months are characterized in the sampled areas over a period of heavy rain and high temperatures. The decline of reproductive period was observed in both sexes, between April and August. Low reproduction in males is characterized by ample light, absence of sperm, only germ cells in the early stages of spermatogenesis are observed (a few spermatogonia and spermatocytes) and interstitial tissue wide. In females, the period of reproductive decline is marked by the absence of unicellular glands in the oviduct epithelium, with higher affinity with the dye. This period corresponds to low rainfall periods and lower temperatures. We propose an analysis of zoological samples; this is a proposal to facilitate the work of many researchers through access to the species, especially rare species.

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“…Our results (Table 8) also show this significant negative correlation, at least when the cage data are used. Tinkle (1961Tinkle ( , 1967Tinkle ( , 1969 has found differences in clutch size and number of clutches within certain reptile species.…”

Section: Evolutionary Strategies In Aedes Aegyptimentioning

confidence: 99%

“…For example, Lack (1954) discussed the evolutionary implications of several studies of intraspecific life table phenomena. Tinkle (1967Tinkle ( , 1969 and Tinkle et al (1970) have investigated the demography of lizards. Birch et al (1963), Dobzhansky et al (1964) and Ohba (1967) studied intraspecific variation in Drosophila.…”

mentioning

confidence: 99%

EVOLUTIONARY STRATEGIES IN LIFE TABLE CHARACTERISTICS AMONG FERAL AND URBAN STRAINS OFAEDES AEGYPTI(L.)

Crovello

Hacker

1972

Evolution

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The Concept of Reproductive Effort and Its Relation to the Evolution of Life Histories of Lizards

Cited by 353 publications

References 23 publications

A unique life history among tetrapods: An annual chameleon living mostly as an egg

A unique life history among tetrapods: An annual chameleon living mostly as an egg

Reproductive Strategies of Brazilian Lizards of the Genus Tropidurus Rodrigues, 1987 (Squamata, Tropiduridae) in the Temporal and Spatial

EVOLUTIONARY STRATEGIES IN LIFE TABLE CHARACTERISTICS AMONG FERAL AND URBAN STRAINS OFAEDES AEGYPTI(L.)

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