Age composition of some vespertilionid bats as determined by dental annuli

Schowalter, David B.; Harder, Lawrence D.; Treichel, Bruce H.

doi:10.1139/z78-049

Cited by 8 publications

(8 citation statements)

References 4 publications

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“…Weakly discernible IL were also observed in the dentine of the Myotis lucifugus (Schowalter et al 1978, Phillips et al 1982 and M. velifer (Phillips et al 1982) as well as in cementum of the Desmodus rotundus (Linhart 1973). Phillips et al (1982) ascertained that: (1) the number of IL either in the dentine or cementum of the M. lucifugus and M. velifer was inadequate to age bats, (2) the number of the IL in the dentine and cementum of these species varied in relation to a level of cross-section as well as different teeth of the same bat may contain the distinct number of IL on the same level of section.…”

Section: Discussionmentioning

confidence: 90%

“…Well-discernible IL were revealed in the dentine of the Eptesicus fuscus and, like in the M. myotis, their number in the dentine was coincident with their number in the cementum and even in a peridontal bone (Schowalter et al 1978). Baagøe (1977) identified no correlation between the number of IL in the dentine and cementum in the N. noctula and P. pipistrellus.…”

Section: Discussionmentioning

confidence: 99%

“…Unfortunately, Kleinenberg (1967, 1969) did not emphasized the latter result in their work and this method of age determination by the IL was widely announced as reliable. Consequently, this method was applied in a range of investigations to evaluate the age structure of some bat populations (Linhart 1973, Schowalter et al 1978, Rakhmatulina 1980, Unikauskaite 1988. Consequently, this method was applied in a range of investigations to evaluate the age structure of some bat populations (Linhart 1973, Schowalter et al 1978, Rakhmatulina 1980, Unikauskaite 1988.…”

Section: Discussionmentioning

confidence: 99%

“…Klevezal and Kleinenberg (1967) reported a correspondence of the number of IL in dentine and cementum to the exact age of the Nyctalus noctula and Myotis myotis. Subsequently, this method has been used to determine the age structures in populations of the Desmodus rotundus, E. fuscus, Lasionycteris noctivagans, Lasiurus cinereus, L. borealis, and M. lucifugus (Linhart 1973, Schowalter et al 1978. However, Baagøe (1977) found this method to be complicated to assess the age of small bats.…”

Section: Introductionmentioning

confidence: 99%

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Dental incremental lines in some small species of the European vespertilionid bats

2001

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2001. Dental incremental lines in some small species of the European vespertilionid bats. Acta Theriologica 46: 33-42.The dentine and cementum of the mammals exhibit incremental lines (IL) that may be seen as dark and light rings in properly prepared sections of teeth. Counting of IL provides a potential method to evaluate the absolute age of many wild species. The aim of the present study was to evaluate IL in small bat species and to test whether the number of IL is associated with the absolute age of bat when its minimal age was known based on ringing data. Teeth of 26 specimens of the following species were examined: Myotis daubentonii (n = 12), Barbastella barbastellus (n = 4), M. brandtii (n = 2), M. nattereri (n = 2), Pipistrellus nathusii (n = 2), Plecotus auritus (n = 2), M. dasycneme (n = 1), Vespertilio murinus (n = 1). Transverse morphological sections of canines, incisors and postcanine teeth were analysed by a light microscopy. In 4 cases, the minimal age of animals examined in this study was known. The IL were revealed in the dentine of 14 bats examined. The cementum of all animals was devoid of IL. The mean distance between the first and second juxtaposed IL of M. daubentonii was 3.2 ± 0.2 mm, but it was significantly fewer among the subsequent adjacent lines. Due to a thinness of the IL, an accurate counting was considerably difficult in the canines containing more than 10 IL, as well as in the incisors and postcanine teeth with more than 3-6 IL. The IL of roots showed the most contrast, but they were almost obscured from view at the cingulum and crown. In bats of known-age, the numbers of IL were significantly lower than minimal age of those animals examined, and IL were either revealed only in certain teeth or absent entirely in all teeth. The present findings suggest that the number of the IL varies in different teeth and is strongly dependent on section level. Consequently, age determination in small bats using dental IL is doubtful and requires a reevaluation.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dental incremental lines in some small species of the European vespertilionid bats

2001

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“…Reproductive status of adult females was recorded, as was the number and sex of fetuses of parous individuals. Ages of adult bats taken at two maternity roosts, a fall roost, and a sample of rabies-suspect individuals were determined from counts of dental annuli (Schowalter et al 1978). The first of January was arbitrarily used as the date on which bats became a year older: thus a bat classified as a l-yr-old was taken the summer after the summer of its birth.…”

Section: Methodsmentioning

confidence: 99%

Reproductive biology of the Big Brown Bat (Eptesicus fuscus) in Alberta

Schowalter,

Gunson

1979

The Canadian Field-Naturalist

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Data on Big Brown Bat (Eptesicus fuscus) populations in Alberta were collected from 1972 to 1977 during surveys to determine the prevalence of rabies. The 60 maternity colonies located included 56 in older buildings; many of these sites were used as hibernacula. Most young were born during the latter part of June; parturition was estimated to extend from at least 5 June to 12 July. Fifteen of 115 pregnancies were twins. Ages of a sample of bats were determined by counts of dental annuli; those ages generally correlated with tooth wear. Yearling females had a lower pregnancy rate than older females.

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A quantitative study of pituitary colloid in the bat Myotis lucifugus lucifugus in relation to age, sex, and season

Anthony

Gustafson

1984

Am. J. Anat.

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Extracellular colloid accumulations were examined in pituitary glands of adult and juvenile, male and female, little brown bats, Myotis lucifugus lucifugus (Chiroptera: Vespertilionidae), collected at various times during the annual reproductive cycle. Round or ovoid periodic acid-Schiff-reactive accumulations of colloid were scattered throughout the pars distalis, pars intermedia, and pars tuberalis. These accumulations were surrounded by processes of agranular "follicular" cells. The proportion of the volume of the pars distalis occupied by colloid (volume fraction) exhibited considerable variation among animals, ranging from 0.00 to 3.18% in the total sample of bats. Pituitaries of juvenile males, yearling males, and nonparous females contained significantly less colloid than those of parous females and adult males. The mean volume fraction for each of these groups suggested that colloid content increased progressively from birth through sexual maturity in this animal. In addition, the frequency distribution of colloid content measurements made in parous females and adult males provided indirect evidence that colloid continues to accumulate throughout life. No sexual dimorphism in colloid content was observed before or after sexual maturity, and colloid content did not fluctuate in relation to the annual reproductive cycle of either males or females.

show abstract

Age composition of some vespertilionid bats as determined by dental annuli

Cited by 8 publications

References 4 publications

Dental incremental lines in some small species of the European vespertilionid bats

Dental incremental lines in some small species of the European vespertilionid bats

Reproductive biology of the Big Brown Bat (Eptesicus fuscus) in Alberta

A quantitative study of pituitary colloid in the bat Myotis lucifugus lucifugus in relation to age, sex, and season

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