摘要
由于金冠戴菊冬季的分布地与红玉冠戴菊相比更偏北,生活的环境更加寒冷,人们认为金冠戴菊对寒冷的耐受力更强。然而,有关红玉冠戴菊和金冠戴菊两者之间对寒冷的耐受性和最大产热能力的直接证据尚无报道。在美国南达科他秋季鸟类迁徙季节,作者采用冷暴露氦氧混合气体(79%氦和21%氧),对红玉冠戴菊和金冠戴菊的寒冷耐受能力和最大代谢率(最大冷诱导代谢,Msux)进行了测定。结果显示:金冠戴菊对低温的耐受能力高于红玉冠戴菊,由于金冠戴菊和红玉冠戴菊的体重和热传导差异不显著,表明对低温的耐受能力的差异不是体重和热传导引起的;而金冠戴菊的最大代谢产热(2.51ml±0.32mlO2min-1,n=11)明显高于雄性(2.27ml±0.25mlO2min-1,n=13)和雌性(2.05ml±0.18mlO2min-1,n=13)的红玉冠戴菊,表明最大代谢的差异可能导致对寒冷的耐受能力不同。相对于红玉冠戴菊,金冠戴菊有良好的耐寒冷能力,与其在冬季分布更北相一致,并与其高的代谢产热能力有关,此模式和许多雀形目鸟类在季节性驯化中增加对寒冷的耐受能力相一致。
Golden-crowned kinglets Regulus satrapa winter farther north and into colder winter climates than ruby-crowned kinglets Regulus calendula and are considered more cold hardy by virtue of their more northerly winter range. However, direct comparisons of cold tolerance and metabolic heat production capacities between these two species have not been undertaken. I measured cold tolerance and summit metabolic rate （Maximal cold-induced metabolism=Msum） during cold exposure in a 79% helium：21% oxygen （helox） atmosphere in fall migrant ruby-crowned and golden-crowned kinglets in southeastern South Dakota, USA. Golden-crowned kinglets tolerated colder temperatures in helox than ruby-crowned kinglets, and this difference was not a function of mass or thermal conductance, as these did not vary significantly between species. Msum in golden-crowned kinglets （2.51 ml±0.32 ml O2mi^-1, n=11） was significantly greater than that in both male （2.27 ml±0.25 ml O2mi^-1, n=13） and female （2.05 ml±0.18 ml O2mi^-1, n=13） ruby-crowned kinglets, suggesting that metabolic differences may account for differences in cold tolerance. The improved cold tolerance in golden-crowned relative to ruby-crowned kinglets is consistent with their more northerly winter distribution and is associated with higher thermogenic capacity, a pattern consistent with seasonal differences in cold tolerance in several small passerine species.
出处
《动物学报》
SCIE
CAS
CSCD
北大核心
2007年第4期600-606,共7页
ACTA ZOOLOGICA SINICA
关键词
戴菊
冷的耐受能力
最大代谢
迁徙
分布
传导率
Kinglets, Regulus satrapa, Regulus calendula, Cold tolerance, Summit metabolism, Migration, Distribution, Conductance
