Rodent Societies: An Ecological & Evolutionary Perspective

size-dependent. For example, variation in patterns of di- morphism in voles may simply be because variation in mat- ing systems ...

et al. 1994). Because these populations are from species that belong to the same genus, phylogenetic correction was not applied ...

argued that hibernation imposed strong selection pressure on female body size, because a minimum body size might be required to ...

Scramble competition is also often characterized by mul- tiple mating by females, which leads to sperm competition. Female promi ...

the rodent taxa themselves. One understudied perspective is the effects of climatic variation on sexual size dimor- phism. Evide ...

F isher (1930)explained why sexually reproducing diploid organisms should invest equally in male and female offspring at the pop ...

Hypotheses for Facultative Adjustment Trivers-Willard hypothesis Trivers and Willard (1973) provided theoretical justifica- tion ...

dition or ability to invest in offspring was gauged as a cor- relate of maternal mass or age (McShea and Madison 1986; Armitage ...

Table 11.1 Literature using rodents relevant to Trivers and Willard’s (1973) hypothesis for facultative adjustment of parental i ...

Trombulak (1991) Spermophilus No No No No (tested for) No Prenatal to Manipulative 1(no) beldingi postnatal Meikle and Thornton ...

adjustments to parental investment, skewed sex ratios at weaning are equally consistent with gender-specific mortal- ity (Werren ...

Hamilton (1967) can occur in recently founded populations in which male offspring of founding females compete among themselves f ...

(Gileva and Federov 1991; Eskelinen 1997). The role of X chromosomes in reducing local mate competition has been further critici ...

tive differential investment. For example, Post et al. (1999) and Forchhammer (2000) proposed that biased sex ratios in dimorphi ...

sume that it must exist if skewed sex ratios are detected. This is faulty logic. Is it necessary to present a proximate mechanis ...

T he neuroendocrine systemis a major path- way in vertebrates that integrates environmental change and through which life-histor ...

tory to the field, to avoid oversimplification and artifacts. Laboratory rodents are often less aggressive, less aware of their ...

Hamilton 1987; Boonstra et al. 1998, 2001c), and hence an increase in free GCs. During pregnancy and lactation, females have hig ...

America. They are obligate hibernators, emerging above ground from a 7– 8 month hibernation in early to mid-April (Buck and Barn ...

during one breeding season for species that live 1 yr (e.g., voles and mice), or over multiple breeding seasons for long- lived ...