2017
DOI: 10.1139/cjz-2017-0084
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Benefits and drawbacks of determining reproductive histories for black bears (Ursus americanus) from cementum annuli techniques

Abstract: Recruitment is difficult to estimate but is essential for determining population trend. Recruitment in bears can be estimated from patterns in width of cementum annuli that indicate years with cubs. We evaluated reproductive history estimates from cementum annuli of 19 101 black bears (Ursus americanus Pallas, 1780) collected over 20 years to determine the benefits and drawbacks of this technique for management agencies. The technique only worked to estimate reproductive histories for 25% of submitted samples,… Show more

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Cited by 5 publications
(14 citation statements)
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“…The posterior distributions for recruitment variables were similar to the prior distributions, indicating that our prior beliefs were not updated by the model. The lone parameter that used data from Wisconsin (other than initial population size) was interbirth interval and proportion of age at first litter data (from 30 ), therefore, the litter size values from the literature could potentially have underestimated litter sizes in Wisconsin. Black bear fecundity is strongly linked to food 17 , 19 , with heavier and older females producing more cubs 40 43 , particularly those with access to human foods 17 .…”
Section: Discussionmentioning
confidence: 99%
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“…The posterior distributions for recruitment variables were similar to the prior distributions, indicating that our prior beliefs were not updated by the model. The lone parameter that used data from Wisconsin (other than initial population size) was interbirth interval and proportion of age at first litter data (from 30 ), therefore, the litter size values from the literature could potentially have underestimated litter sizes in Wisconsin. Black bear fecundity is strongly linked to food 17 , 19 , with heavier and older females producing more cubs 40 43 , particularly those with access to human foods 17 .…”
Section: Discussionmentioning
confidence: 99%
“…To specify prior distributions for PR a we used birth data from Wisconsin black bears determined through cementum annuli techniques 30 . To determine the age-specific probability of having a first litter, we used data from 1989 to 2008, and calculated the annual mean proportion of bears giving birth for the first time for each age class.…”
Section: Methodsmentioning
confidence: 99%
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“…Using two traits in two species, we show that the method is not trait‐ or species‐specific, and thereby could be used in a broad range of species. Growth data from traits that form annual growth annuli such as horns and teeth already can be collected from harvested female ungulates, ursids, phocids or other taxa at low cost (Allen et al., 2017; Corlatti et al., 2015; Nguyen et al., 2017). Many wildlife management agencies already have decades of measurements of such traits (Douhard et al., 2016).…”
Section: Discussionmentioning
confidence: 99%
“…For example, annual growth increments in teeth and horns of some mammals may provide information about reproductive history over multiple years. Previous studies have retrospectively assessed female reproductions using length of horn growth increments in Japanese serow Capricornis crispus (Miura et al., 1987), and width of tooth cementum annuli in black bears Ursus americanus (Allen et al., 2017; Coy & Garshelis, 1992), Asian black bears Ursus thibetanus (Tochigi et al., 2018), grizzly bears Ursus arctos (Matson et al., 1999), polar bears Ursus maritimus (Medill et al., 2010), sea otters Enhydra lutris kenyoni (von Biela et al., 2008), ringed seals Pusa hispida (Nguyen et al., 2017) and dolphins genus Stenella (Klevezal' & Myrick, 1984). Traits that form growth annuli may provide information on reproductive effort over multiple years, but their reliability has seldom been tested with a sample of animals with known reproductive history.…”
Section: Introductionmentioning
confidence: 99%