Longevity Records and Notes on Tooth Wear of Bats

Hall, John S.; Cloutier, Roger J.; Griffin, Donald R.

doi:10.2307/1376240

Cited by 33 publications

(10 citation statements)

References 5 publications

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“…Thus, in spite of the perils of misinterpretation of age through estimating tooth wear in bats, as pointed out by Hall ( 1957), we feel the very lack of correspondence between numbers per sex and in the numbers per age class within each sex is direct evidence of differences in relative abundance per age class.…”

Section: --mentioning

confidence: 78%

Mexican Free‐Tailed Bats in Texas

Davis¹,

Herreid²,

Short³

1962

Ecological Monographs

232

135

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Study of the life history and ecology of insectivorous bats in the United States was accelerated by the discovery m 1953 (Courter, 1954) that these ubiquitous mammals are hosts to rabies virus. There was strong suspicion that insectivorous bats of the southwestern United States might be in contact with the rabies-transmitting vampire bats of Mexico (Courter, op. cit.). Consequently four projects concerned with bat rabies and ecology were set up in this area under financial support from the U. S. Public Health Service. Early work on these projects verified three significant features of the bat problem in the Southwest: (1) rabies is common in bats of this area (Eads, 1955); (2) the most abundant kind of bat in the Southwest is Tadarida brasiliensis mexicana (Sanssure), the Mexican Free-tailed, or Mexican Guano Bat 2 (Eads, 1957; Villa, 1956) ; and (3) bats of this kind move from Mexico into the Southwestern United States each spring and back into Mexico each fall (Glass, 1958; Villa, op. cit.).

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Section: --mentioning

confidence: 78%

Mexican Free‐Tailed Bats in Texas

Davis¹,

Herreid²,

Short³

1962

Ecological Monographs

232

135

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“…Body mass has also been shown to be a poor indicator of age in other mammals (Cameron-Smith, 1965;Chaplin & White, 1969;Bothma, Teer & Gates, 1972). The use of tooth wear on its own has been shown to be an unreliable ageing method in bats and elk (Hall, Cloutier & Griffin, 1957;Keiss, 1969;Morris, 1972), although some error can be eliminated by studying single populations with similar dietary and tooth wear characteristics and by using tooth wear as a relative rather than absolute method of ageing the population. The time of tooth eruption is less variable and can serve as a valuable marker.…”

Section: Discussionmentioning

confidence: 99%

The relative age structure and body masses of complete wild‐captured colonies of two social mole‐rats, the common mole‐rat, Cryptomys hottentotus hottentotus and the Damaraland mole‐rat, Cryptomys damarensis

1990

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The relative ages of individuals in a complete wild‐captured colony of 13 Cryptomys hottentotus hottentotus and a complete wild‐captured colony of 25 Cryptomys damarensis were determined by means of tooth wear and eruption patterns and through the degree of ossification of their skeletons. From sequential tooth wear and eruption patterns four relative age classes were discerned in C. h. hottentotus and five in C. damarensis. These relative age class allocations were supported by the studies on the ossification of the skeletons. In C. damarensis, older animals are not necessarily the larger‐sized individuals. In C. h. hottentotus, however, older animals are usually the larger‐sized individuals. The reproductive pair in each of the Cryptomys species are the oldest or amongst the oldest individuals in the colony. Individuals in a second colony of C. damarensis kept under laboratory conditions for three years maintained greatly disparate body masses which were correlated with the role of the individual within the colony and not, where it was known, with the age of the animal. An analysis of 13 body and skull measurements performed on a complete colony of 13 C. h. hottentotus and a complete colony of 25 C damarensis revealed that only C. damarensis showed sexual dimorphism. This dimorphism was apparent from an early age but became more pronounced in older animals.

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“…This may increase handling time and energy investment, but could yield diets of similar composition. However, Hall (1957) found that the molars of E. fuscus wear faster than the canines. No matter what the wear patterns of E. fuscus teeth are, our data suggest that tooth wear does not significantly impair the ability of older bats to capture and ingest beetles.…”

Section: Discussionmentioning

confidence: 94%