Biased adult sex ratio can affect fecundity in primiparous moose Alces alces

Solberg, Erling Johan; Loison, Anne; Ringsby, Tor H.; Sæther, Bernt‐Erik; Heim, Morten

doi:10.2981/wlb.2002.016

Cited by 71 publications

(80 citation statements)

References 43 publications

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“…Both mass and age of individuals affected pregnancy in free-ranging Elk in Michigan, similar to other large mammal populations (Samson and Huot 1995;Bérubé et al 1999;Solberg et al 2002;Nahlik and Sandor 2003), including Elk (Hudson and Haigh 2002). The best overall predictor of pregnancy was body mass (Table 2).…”

Section: Discussionmentioning

confidence: 88%

Factors Affecting Pregnancy in Free-ranging Elk, Cervus elaphus nelsoni, in Michigan

2009

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Uncertainty exists as to which factors are most closely related to probability of pregnancy in Elk (Cervus elaphus), which thresholds are key for managers who want to assess the potential productivity of free-ranging Elk herds, and whether these thresholds vary among populations. We examined relationships among pregnancy, age, and mass for 513 harvested freeranging Elk in Michigan, and compared relationships with other published models and with thresholds derived from other free-ranging and penned populations to see if relationships were consistent among populations. Pregnancy rates varied (χ 2 2 = 136.3; P < 0.0001) among yearling (0.30), prime-aged (2.5-11.5-year-olds; 0.88), and old (> 12.5-year-olds; 0.60) cows. Probability of pregnancy in adult cows was related to mass (χ 2 = 7.4; P = 0.006), age (χ 2 = 12.6; P = 0.0004) and age class (χ 2 = 16.4; P < 0.0001), but not to lactation status (χ 2 = 0.4; P = 0.515); pregnancy was also positively related (χ 2 = 15.8; P < 0.0001) to mass in yearlings. Probability of pregnancy increased 1.02× and 1.04× for each 1 kg increase in body mass of adult and yearling cows, respectively, and prime-aged cows were 4.9× more likely to conceive than old cows. Compared to thresholds derived primarily from penned or farmed Elk, both adult and yearling free-ranging Elk in Michigan and elsewhere were able to achieve higher levels of pregnancy at lower body mass. Thresholds also varied among free-ranging Elk populations. Given variation among populations, managers should calibrate mass-pregnancy relationships for their respective populations to determine whether condition is potentially limiting pregnancy in their populations.

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Section: Discussionmentioning

confidence: 88%

Factors Affecting Pregnancy in Free-ranging Elk, Cervus elaphus nelsoni, in Michigan

2009

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“…Our results suggest that there were slightly more females than males in the population; however, human harvesting may differ significantly from those derived from natural mortality (Solberg et al, 2002). In our study area male roe deer are hunted preferentially because they have antlers.…”

Section: Discussionmentioning

confidence: 66%

Sustainable monitoring of roe deer in public hunting areas in the Spanish Pyrenees

et al. 2013

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Aim of study: Monitoring trends in animal populations is essential for the development of appropriate wildlife management strategies.Area of study: The area is situated in the southern Pyrenees (Aragon), Spain. Material and methods:To measure the abundance, population trends, sex ratio, and mortality of roe deer populations, we analyzed data from i) driven hunts for wild boar (hunting seasons 1995/96-2009/10, n = 1,417, ii) itineraries, which were used to calculate the KAI and density using DS (2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010), n = 310 itineraries), iii) roe deer carcass recoveries (2006-2010, n = 100), and iv) data from the deer hunting quota fulfillment (2006-2010, n = 325 hunted animals.Main results: Based on DS, in 2010, the average density of roe deer populations was 2.3 km -2 (CV 17%). Based on the KAI and the battues, the estimated average annual rate of increase was 5.8% and 4.3%, respectively. Based on the KAI and the carcass recoveries, the estimates of the population sex ratio were 0.75 (n = 641) and 0.9 (n = 100) males per female, respectively. Carcass recoveries indicated that mortality was highest in late winter and early spring. The average body masses and sizes of males and females were within the ranges reported for other Iberian and European populations.Research highlights: Monitoring should be continued in the Aragon population of roe deer, although larger sample sizes are required to increase the accuracy of estimates and assessments of the impact of management actions.

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“…population sex ratio reasonably well (e.g. Solberg et al 2002). Depending on the region and measured character, this faster growth may have led to male moose reaching the prime-age at younger age.…”

Section: Discussionmentioning

confidence: 87%

Variation in Growth Pattern of Male MooseAlces alcesAfter Two Contrasted Periods of Hunting

Tiilikainen¹,

Nygrén²,

Pusenius³

et al. 2010

Annales Zoologici Fennici

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Exploitation by humans impacts wildlife in many ways. Selective harvesting regimes affect demography of the remaining population, and increased mortality shortens life expectancy affecting optimal life-history strategies. We studied this in a Finnish moose (Alces alces) population using harvest data on age, carcass weight, antler spread and tine number, and compared the growth in body weight and that of antlers in male moose after adult-biased and mixed age class harvesting. According to our results, both body weight and antler growth of young males increased after mixed age class harvesting. Changes in growth patterns were affected by population density and sex ratio, but as the period effect still remained in the growth patterns after removing the effects of density and sex ratio, we suggest that the change in male moose growth patterns might have resulted from the harvest-induced young-male age structure and higher harvest pressure among young male moose.

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Biased adult sex ratio can affect fecundity in primiparous moose Alces alces

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 71 publications

References 43 publications

Factors Affecting Pregnancy in Free-ranging Elk, <em>Cervus elaphus nelsoni</em>, in Michigan

Factors Affecting Pregnancy in Free-ranging Elk, <em>Cervus elaphus nelsoni</em>, in Michigan

Sustainable monitoring of roe deer in public hunting areas in the Spanish Pyrenees

Variation in Growth Pattern of Male MooseAlces alcesAfter Two Contrasted Periods of Hunting

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