Sexual differences in body weight patterns of Richardson's ground squirrels during the breeding season
Sexual differences in body weight patterns of Richardson's ground squirrels during the breeding season
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理查森地松鼠在繁殖季节体重模式的性别差异
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
G. R. Michener
中科院分区：
文献类型：
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作者：
G. R. Michener
在艾伯塔省南部进行的一项为期 4 年的研究中，成年理查森地松鼠的体重变化是通过从冬眠中苏醒到繁殖季节结束后每隔 1-3 天重新称重个体来确定的。比较了两性之间体重变化相对于生殖事件的时间模式。平均而言，从冬眠中醒来时，雄性比雌性重 137-171 克。雌性通常在恢复地上活动后 4 天进行繁殖，种群中的所有雌性在 3-5 周内出现并繁殖。雌性在配种前体重增加，但大多数 (65%) 在授精当天体重增加出现 1 天中断。受精后体重再次增加，怀孕期间的体重增加超过了胚胎发育造成的体重增加。雄性在繁殖季节体重减轻。雄性的最大损失发生在 1.5-2 周期间，此时雌性每天受精的数量最高。与雌性相比，雄性体重减轻的时间较长，反映了两性繁殖季节有效长度的差异（雄性为 3-5 周，雌性为 <1 天）。
During a 4-year study in southern Alberta, weight changes of adult Richardson's ground squirrels were determined by reweighing individuals at 1–3-day intervals following emergence from hibernation until the end of the breeding season. Temporal patterns in weight changes relative to reproductive events were compared between sexes. On average, males were 137–171 g heavier than females on emergence from hibernation. Females typically bred 4 days after resuming aboveground activity, and all females in the population emerged and bred in a 3–5-week period. Females gained mass prior to breeding, but the majority (65%) exhibited a 1 day interruption in weight gain on the day of insemination. Mass increased again after insemination, and weight gain during pregnancy exceeded that attributable to developing embryos. Males lost mass during the breeding season. Maximum loss by males occurred in the 1.5–2-week period in which the number of females inseminated per day was highest. The longer period of weight loss by males compared with females reflected the difference in effective length of the breeding season for the sexes (3–5 weeks for males versus <1 day for females).