Differences in reproductive success between laboratory and wild-derived golden hamsters (Mesocricetus auratus) as a consequence of inbreeding

Fritzsche, Peter; Neumann, Karsten; Nasdal, Karsten; Gattermann, Rolf

doi:10.1007/s00265-006-0159-3

Cited by 27 publications

(23 citation statements)

References 45 publications

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“…Wild, outbred golden hamster males (Mesocricetus auratus) also showed significantly increased fertilization success (87%) in competition with inbred, laboratory hamsters (Fritzsche et al 2006). Measures of mating behaviour and sperm quality and quantity showed no differences between the inbred laboratory strains and the outbred wild strains, and laboratory males show full effective fertility (Fritzsche et al 2006). This hamster study therefore parallels our own findings that inbreeding depression of male reproductive fitness is only exposed under competition.…”

Section: Discussionsupporting

confidence: 80%

“…Male mites subjected to a single sib Â sib generation of inbreeding (F 1 ¼ 0.25) showed reduced sperm competitiveness against non-inbred equivalents, with a reduction in average relative fertilization success from 44 per cent for noninbred males to 21 per cent for inbred males in two-male sperm competitions (Konior et al 2005). Wild, outbred golden hamster males (Mesocricetus auratus) also showed significantly increased fertilization success (87%) in competition with inbred, laboratory hamsters (Fritzsche et al 2006). Measures of mating behaviour and sperm quality and quantity showed no differences between the inbred laboratory strains and the outbred wild strains, and laboratory males show full effective fertility (Fritzsche et al 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Also, competition can exacerbate inbreeding depression: for example, inbreeding amplifies the inability of male mice to win dominance hierarchies and maintain territories, both of which are important pre-copulatory traits for reproductive success (Meagher et al 2000). In the context of postcopulatory competition for fertilization, recent experimental evidence shows that inbred male mites, hamsters and guppies have reduced ability to win sperm competitions (Konior et al 2005;Fritzsche et al 2006;Zajitschek et al 2009). Since multiple mating and sperm competition are widespread phenomena across diverse taxa (Birkhead & Møller 1998), it is important to understand the consequences of inbreeding for reproductive success under pre-and post-copulatory sexual selection.…”

Section: Introductionmentioning

confidence: 99%

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Inbreeding depresses sperm competitiveness, but not fertilization or mating success in male Tribolium castaneum

et al. 2010

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As populations decline to levels where reproduction among close genetic relatives becomes more probable, subsequent increases in homozygous recessive deleterious expression and/or loss of heterozygote advantage can lead to inbreeding depression. Here, we measure how inbreeding across replicate lines of the flour beetle Tribolium castaneum impacts on male reproductive fitness in the absence or presence of male -male competition. Effects on male evolution from mating pattern were removed by enforcing monogamous mating throughout. After inbreeding across eight generations, we found that male fertility in the absence of competition was unaffected. However, we found significant inbreeding depression of sperm competitiveness: non-inbred males won 57 per cent of fertilizations in competition, while inbred equivalents only sired 42 per cent. We also found that the P 2 'offence' role in sperm competition was significantly more depressed under inbreeding than sperm 'defence' (P 1 ). Mating behaviour did not explain these differences, and there was no difference in the viability of offspring sired by inbred or non-inbred males. Sperm length variation was significantly greater in the ejaculates of inbred males. Our results show that male ability to achieve normal fertilization success was not depressed under strong inbreeding, but that inbreeding depression in these traits occurred when conditions of sperm competition were generated.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inbreeding depresses sperm competitiveness, but not fertilization or mating success in male Tribolium castaneum

et al. 2010

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“…Golden hamsters are a classic system for behavioral studies. They are sexually monomorphic, solitary, and semi-fossorial animals that naturally occur in agricultural fields in northern Syria and southern Turkey (Fritzsche et al 2006). To date, no studies have documented the actual predation of hamsters in their natural habitat, but our field work indicates that likely predators include fox (Vulpe vulpe), various snakes, European white stork (Ciconia ciconia), and several species of raptors and owls (Gattermann et al 2001;Johnston et al, unpublished observations 2005Johnston et al, unpublished observations -2007.…”

Section: Introductionmentioning

confidence: 99%

Male golden hamsters (Mesocricetus auratus) are more reactive than females to a visual predator cue

McPhee

Ribbeck

Johnston

2008

J Ethol

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In most species of small mammals, males are exposed to higher levels of risk than females because they compete for mates, travel greater distances to find and procure mates, and/or defend a territory. This suggests that males and females might have different responses to risky situations, such as the presence of a predator. We tested responses to a visual predator cue (an owl silhouette) in male and female golden hamsters (Mesocricetus auratus). In a laboratory arena, there was no significant sex difference in the latency to enter the burrow or time spent in the burrow immediately after exposure to the owl silhouette. Males, however, were less likely to be active during the 3-min period following the animal's exposure to the silhouette, indicating that male golden hamsters are more wary after exposure to an aerial predator cue than females. Most studies of responses to predators or predator cues have not considered sex differences, but our results show that males and females may have quite different responses to predator cues. Further work should be done to characterize and quantify sex differences in response to predators or predator cues.

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“…In the study at hand, representatives from this population are compared with the offspring of wild hamsters from 1998 (GATTERMANN 2000). The population differences expected due to their different backgrounds have been proven, for example, in their behavior, reproduction rates, body mass trends, organ mass, and blood characteristics (FRITZSCHE et al 2000, GATTERMANN 2000, GATTERMANN et al 2002, FRITZSCHE et al 2006, KRAUSE 2008. The decreased genetic variability of the lab population has also been documented (FRITZSCHE et al 2000, NEUMANN et al 2005, KRAUSE 2008.…”

Section: Introductionmentioning

confidence: 99%

Statistical modeling for growth data in linear mixed models – Implications derived from an example of a population comparison of Golden Hamsters

et al. 2009

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Using statistical modeling to determine the structure of expectation and covariance employed during analysis is a common feature of analytical research. This paper describes the necessary methodology for, and illustrates those techniques that are of special importance in, practical modeling and evaluation scenarios (likelihood ratio test, analytical criteria, residual analysis). Our approach is demonstrated upon a population comparison, taken on various measurement dates, that focuses on a wild population and a laboratory population of Golden Hamsters. The selected example is particularly suited due to the fact that -aside from the actual growth function of interest -additional fixed (e.g. effect of different mating periods, litter size) and random factors (e.g. maternal environment, repeated performances per animal) must be considered. The modeling shows significant efficiency regarding the improvement of the analytical criteria. The recommended evaluation model leads to a very close match of the observed ordinary least square residuals and of the variance and covariance functions, respectively, that have been derived from the estimated covariance structure. Keywords

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Differences in reproductive success between laboratory and wild-derived golden hamsters (Mesocricetus auratus) as a consequence of inbreeding

Cited by 27 publications

References 45 publications

Inbreeding depresses sperm competitiveness, but not fertilization or mating success in male Tribolium castaneum

Inbreeding depresses sperm competitiveness, but not fertilization or mating success in male Tribolium castaneum

Male golden hamsters (Mesocricetus auratus) are more reactive than females to a visual predator cue

Statistical modeling for growth data in linear mixed models – Implications derived from an example of a population comparison of Golden Hamsters

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