Inbreeding depression

Meagher, S., Penn, D.J. and Potts, W.K. (2000) Male-male competition magnifies inbreeding depression in wild house mice. Proc. Natl. Acad. Sci. U.S.A. 97,3324-3329. 

Keane, B., Creel, S.R. and Waser, P.M. (1996) No evidence of inbreeding avoidance or inbreeding depression in a social carnivore. Behav. Ecol. 7, 480-489. 

Slate, J., Kruuk, L.E.B., Marshall, T.C., Pemberton, J.M. and Clutton-Brock, T.H. (2000) Inbreeding depression influences lifetime breeding success in a wild population of red deer (Cervus elaphus). Proc. R. Soc. B 267, 1657-1662. 

Slate, J. and Pemberton, J.M. (2002) Comparing molecular measures for detecting inbreeding depression. J. Evol. Biol. 15,20-31. 

Learning of the parental odor may be important for odor preferences (Jemiolo etah, 1991). Estrous white-footed mice prefer males of intermediate relatedness, or their odors. The levels of reproductive success (i.e. litter size at weaning and offspring weight at weaning) indicated inbreeding depression. Non-estrous females showed no preferences (Keane, 1990). 

Waser, N. M and Price, M. V. (1994). Crossing-distance effects in Delphinium nelsonii outbreeding and inbreeding depression in progeny fitness. Evolution 48 842-852. 

Dramatic life history alterations that result from toxicant exposure could lead to population extinction through a variety of mechanisms. For example, if one life stage of an organism is more sensitive to toxicant exposure than others, reduced survival and fecundity may bring about population bottlenecks, severe reductions in population size, or alterations in age class structure. Bottlenecks may be accompanied by a decrease in genetic diversity, inbreeding depression, further diminution of fitness, and eventually population extinction. Alternative hypotheses such as decreases in population density also may explain how toxicant exposure could lead to severe population declines or extinction. 

Inbreeding depression of test scores in offspring of cousin mating (0.80). 

Jensen That is true. We know that there is a lot of dominance variance in intelligence, or you wouldn t get a high degree of inbreeding depression of IQ or g. It is higher than for many other polygenic traits. 

Gangestad You don t need a lot of dominance variance to get inbreeding depression on a trait, if most of the trait s genetic variance is due to mutations. With rare mutations there are very few double recessive mutations, and therefore, almost all of the variance caused by each mutation is merely additive, even if the effect of double recessives is nonadditive. So rare mutations can produce low dominance variance yet substantial inbreeding depression. 

Ave.) and reliabilities. Inbreeding depression and black/white differences from Rushton (1999) as follows ... 

AGREN, J., SCHEMSKE, D. W., Outcrossing rate and inbreeding depression in 2 annual monoecious herbs. Begonia hirsuta and B semiovata. Evolution, 1993, 47, 125-135. 

Evolution of the magnitude and timing of inbreeding depression in plants. Evolution, 50, 54-70. 

There are no estimates available of inbreeding depression and genetic load in subalpine larch. 

There have been no direct studies of inbreeding depression reported for this species. As outcrossing rates for western larch are estimated to be significantly lower than 1, this may indicate that inbreeding depression is less pronounced than in some other conifers (El-Kassaby and Jaquish, 1996). 

---