Reproductive success in reindeer males in a herd with varying sex ratio

Røed, Knut; Holand, Øystein; Smith, Martin A.; Gjøstein, Hallvard; Kumpula, Jouko; Nieminen, Mauri

doi:10.1046/j.1365-294x.2002.01509.x

Cited by 69 publications

(70 citation statements)

References 15 publications

(16 reference statements)

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“…Blood samples were obtained from all individuals and analyses of paternity were based on scoring polymorphic DNA microsatellites (Røed et al 2002). The mean (Gs.d.)…”

Section: Methodsmentioning

confidence: 99%

Male phenotypic quality influences offspring sex ratio in a polygynous ungulate

et al. 2006

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Evolutionary models of sex ratio adjustment applied to mammals have ignored that females may gain indirect genetic benefits from their mates. The differential allocation hypothesis (DAH) predicts that females bias the sex ratio of their offspring towards (more costly) males when breeding with an attractive male. We manipulated the number of available males during rut in a polygynous ungulate species, the reindeer (Rangifer tarandus), and found that a doubling of average male mass (and thus male attractiveness) in the breeding herd increased the proportion of male offspring from approximately 40 to 60%. Paternity analysis revealed indeed that males of high phenotypic quality sired more males, consistent with the DAH. This insight has consequences for proper management of large mammal populations. Our study suggests that harvesting, by generating a high proportion of young, small and unattractive mates, affects the secondary sex ratio due to differential allocation effects in females. Sustainable management needs to consider not only the direct demographic changes due to harvest mortality and selection, but also the components related to behavioural ecology and opportunities for female choice.

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“…Blood samples were obtained from all individuals and analyses of paternity were based on scoring polymorphic DNA microsatellites (Røed et al 2002). The mean (Gs.d.)…”

Section: Methodsmentioning

confidence: 99%

Male phenotypic quality influences offspring sex ratio in a polygynous ungulate

et al. 2006

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“…The amplification was performed on a GeneAmp PCR System 9700 (Applied Biosystems) as previously described (see methods described in Røed (2002)). PCR products were electrophoresed using an ABI Prism 3500xl Genetic Analyzer (Applied Biosystems).…”

Section: Methodsmentioning

confidence: 99%

Maintaining genetic integrity of coexisting wild and domestic populations: Genetic differentiation between wild and domestic Rangifer with long traditions of intentional interbreeding

Anderson

Kvie

Davydov

et al. 2017

Ecology and Evolution

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This study investigates the genetic effect of an indigenous tradition of deliberate and controlled interbreeding between wild and domestic Rangifer. The results are interpreted in the context of conservation concerns and debates on the origin of domestic animals. The study is located in Northeastern Zabaĭkal'e, Russia at approximately 57 degrees North latitude. Blood and skin samples, collected from wild and domestic Rangifer, are analyzed for their mtDNA and microsatellite signatures. Local husbandry traditions are documented ethnographically. The genetic data are analyzed with special reference to indigenous understandings of the distinctions between local domestic types and wild Rangifer. The genetic results demonstrate a strong differentiation between wild and domestic populations. Notably low levels of mtDNA haplotype sharing between wild and domestic reindeer, suggest mainly male‐mediated gene flow between the two gene pools. The nuclear microsatellite results also point to distinct differences between regional domestic clusters. Our results indicate that the Evenki herders have an effective breeding technique which, while mixing pedigrees in the short term, guards against wholesale introgression between wild and domestic populations over the long term. They support a model of domestication where wild males and domestic females are selectively interbred, without hybridizing the two populations. Our conclusions inform a debate on the origins of domestication by documenting a situation where both wild and domestic types are in constant interaction. The study further informs a debate in conservation biology by demonstrating that certain types of controlled introgression between wild and domestic types need not reduce genetic diversity.

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“…(a) Study area and experimental animals The study was conducted at Kutuharju Field Reindeer Research Station, in Kaamanen,Finland (698 N,278 E), as a part of a larger reproductive study in reindeer (Røed et al 2002). The herd consisting of 75 females in 1999 and 74 females in 2000 was exposed to three adult (4.5-year-old, weight: 120-140 kg) males and three young (1.5-year-old, weight: 61-68 kg) males, respectively, all born within the herd.…”

Section: Methodsmentioning

confidence: 99%

“…50 ha) where data on birth date and mother-calf assignments were obtained. Blood samples were obtained from all individuals and analysed for 17 DNA microsatellite loci (Røed et al 2002) to assess paternities and relatedness. Relatedness (R) was estimated for all pairwise combinations of all females producing a calf and all the available males for each year separately by using the program RELATEDNESS 5.0 (Queller & Goodnight 1989).…”

Section: Methodsmentioning

confidence: 99%

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No evidence of inbreeding avoidance in a polygynous ungulate: the reindeer (Rangifer tarandus)

et al. 2006

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In polygynous species, mate choice is an integrated part of sexual selection. However, whether mate choice occurs independently of the genetic relatedness among mating pairs has received little attention, although inbreeding may have fitness consequences. We studied whether genetic relatedness influenced females' choice of partner in a highly polygynous ungulate—the reindeer ( Rangifer tarandus )—in an experimental herd during two consecutive rutting seasons; the herd consisting of 75 females in 1999 and 74 females in 2000 was exposed to three 4.5-year-old adults and three 1.5-year-old young males, respectively. The females' distribution during peak rut was not influenced by their genetic relatedness with the dominant males of the mating groups. Further, genetic relatedness did not influence the actual choice of mating partner. We conclude that inbreeding avoidance through mating group choice as well as choice of mating partner, two interconnected processes of female mate choice operating at two different scales in space and time, in such a highly female-biased reindeer populations with low level of inbreeding may not occur.

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Reproductive success in reindeer males in a herd with varying sex ratio

Cited by 69 publications

References 15 publications

Male phenotypic quality influences offspring sex ratio in a polygynous ungulate

Male phenotypic quality influences offspring sex ratio in a polygynous ungulate

Maintaining genetic integrity of coexisting wild and domestic populations: Genetic differentiation between wild and domestic Rangifer with long traditions of intentional interbreeding

No evidence of inbreeding avoidance in a polygynous ungulate: the reindeer (Rangifer tarandus)

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