Differences between the Reproductive Cycles of Sympatric Anolis Lizards on Trinidad

Gorman, George C.; Licht, Paul

doi:10.2307/1442887

Cited by 13 publications

(3 citation statements)

References 5 publications

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“…According to Tinkle ( 1969) and , these two species are short-lived, mature early, and have a high reproductive effort (r-strategists). Licht and Gorman (1970), Ruibal et al (1972), and Gorman and Licht (1975) found an inverse relationship between reproductive activity and fatbody size in a number of tropical anoles. These authors collected their C. tigris from western Texas, where they mature in 1 yr and produce two clutches/ season (r-strategist; Tinkle 1969).…”

Section: Supporting Evidence From Studies On Other Lizard Speciesmentioning

confidence: 96%

“…These three species can be classified as r-strategists (Tinkle 1969). Licht and Gorman (1970), Ruibal et al (1972), and Gorman and Licht (1975) found an inverse relationship between reproductive activity and fatbody size in a number of tropical anoles. Those species that reproduced throughout the year either had no fatbodies or very small ones, while those that exhibited reproductive cycles had large fatbodies during the nonreproductive phase (dry season) and lacked fatbodies while reproducing (wet season).…”

Section: Supporting Evidence From Studies On Other Lizard Speciesmentioning

confidence: 96%

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Ecology and Physiological Aspects of Reproductive Strategies in Two Lizards

Derickson¹

1976

Ecology

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Two lizard species, the northern prairie lizard (Sceloporus undulatus garmani) from Reno County, Kansas and the northern sagebrush lizard (Sceloporus graciosus graciosus) from Washington County, Utah, were used to test four hypotheses and one assumption related to the theory of r-and K-selection. The northern prairie lizard is short-lived, matures early, and has a high reproductive effort (r-strategist) while the northern sagebrush lizard is longlived, has delayed maturity, and a low reproductive effort (K-strategist). One of the assumptions of the r-and K-selection theory is that competition for food is more intense for Kstrategists than for r-strategists. Given this assumption, greater food availability for the prairie lizard was hypothesized to result in ( 1) a higher level of body lipids, (2) a higher rate of lipid utilization, ( 3) a lower percentage of ingested energy available for metabolism, and ( 4) an expenditure of less energy per offspring than in the sagebrush lizard.Total lipid levels in the two species collected before and after hibernation indicated that prairie lizards had significantly higher lipid levels than sagebrush lizards during both collection periods. A comparison of the amount of body lipids lost and the amount of egg lipids gained during vitellogenesis of the first clutch suggested that more lipids are being utilized for egg production in prairie lizards than in sagebrush lizards.Sagebrush lizards apparently are better adapted physiologically to lower food levels since they had lower rates of lipid utilization during starvation studies and they extracted more energy usable for metabolism from ingested food than prairie lizards.Although both species expended about the same amount of energy on a given clutch of eggs, prairie lizards produced more offspring per clutch and therefore expended less energy per offspring. Prairie lizards produced as many as three clutches per season as compared to two clutches per season for sagebrush lizards, and changes in length-lean weight relationships for the two species over a given season suggested that the additional clutch of eggs produced by prairie lizards may be contributing to the higher mortality observed in this species.Indirect evidence, based on precipitation levels and insect biomass at the two study sites and mouthgapes of the two species, supported the assumption that more food was available to the prairie lizards than the sagebrush lizard. Higher precipitation levels (indicating greater insect biomass) occurred at the prairie lizard collection site and this species had a smaller mouthgape index, indicating greater specialization in utilization of prey sites.

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Section: Supporting Evidence From Studies On Other Lizard Speciesmentioning

confidence: 96%

Section: Supporting Evidence From Studies On Other Lizard Speciesmentioning

confidence: 96%

Ecology and Physiological Aspects of Reproductive Strategies in Two Lizards

Derickson¹

1976

Ecology

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“…Figure 17. Transverse typical of species with continuous reproductive cycles (Church, 1962;Gorman and Licht, 1975;Vitt and Goldberg, 1983), but rare among species with seasonal cycles.…”

Section: Testicular and Epididymal Cyclesmentioning

confidence: 99%

Spermiogenesis and testicular cycle of the lizard Tropidurus torquatus (Squamata, Tropiduridae) in the Cerrado of central Brazil

Colli

Vieira²,

Báo

et al. 2001

Amphib Reptilia

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We studied the spermiogenesi s and testicular cycle of the lizard Tropidurus torquatus, using light and electron microscopy. Males bearing spermatozoa were present practically year-round and spermatogeni c activity showed a regenerative phase from late dry season to the end of the rainy season (July to March), with low frequency of initial stages of the spermatogeni c cycle, and a brief degenerative phase from April to June, lacking the total regression of seminiferous tubules. These characteristics resemble those from species with continuous reproductive cycles, contrasting with the strongly seasonal reproductive cycle of females. Spermiogenesis includes nuclear elongation, chromatin condensation, acrosomal and agellar development , and elimination of excessive cytoplasm. We describe some new aspects in the spermiogenesi s of T. torquatus, including the interaction between spermatid and Sertoli cell, acrosomal granule, subacrosomal granule, and the brous sheath formation. The testicular cycle of T. torquatus is very similar to that of other lizards that inhabit seasonal environments , and its spermiogenesi s and ultrastructure of mature sperm display a number of conservative features.

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Rainfall and reproduction in females of the tropical lizard Mabuya striata striata

Patterson

1991

Oecologia

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The reproduction of females of the lizard Mabuya striata striata was studied at two sites in Central Africa in an area with distinct rainy and dry seasons. The two sites differed in the amount of rain received. At the wetter site, a high proportion of M. s. striata were reproductive at all seasons. At the drier site, a high proportion of females were reproductive during the rainy season, but fewer were reproductive during the dry season. In addition, clutch size was lower at the drier site in the dry season. At both sites, low rainfall during the dry season appeared to constrain reproduction, but this constraint was greater at the drier site. At both sites, abdominal fat bodies were large during the rainy season and the early dry season and much smaller in the late dry season. In the early dry season abdominal fat bodies were larger at the drier than the wetter site. Females at the drier site apparently channel energy differentially into adult survival rather than present reproduction.

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Differences between the Reproductive Cycles of Sympatric Anolis Lizards on Trinidad

Cited by 13 publications

References 5 publications

Ecology and Physiological Aspects of Reproductive Strategies in Two Lizards

Ecology and Physiological Aspects of Reproductive Strategies in Two Lizards

Spermiogenesis and testicular cycle of the lizard Tropidurus torquatus (Squamata, Tropiduridae) in the Cerrado of central Brazil

Rainfall and reproduction in females of the tropical lizard Mabuya striata striata

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