Latitudinal Variation in Reproductive Strategies by the Migratory Louisiana Waterthrush

The condor

Brady J. Mattsson¹ 

关键词: fecundity;    latitudinal variation;    neotropical migrant;    stochastic individual-based model;    life history components;    Louisiana Waterthrush;    Parkesia motacilla;   

DOI  :  10.1525/cond.2011.090212

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. We evaluated hypotheses that seek to explain breeding strategies of the Louisiana Waterthrush (Parkesia motacilla) that vary across a latitudinal gradient. On the basis of data from 418 nests of color-banded individuals in southwestern Pennsylvania and 700 km south in the Georgia Piedmont, we found that clutch size in replacement nests and probability of renesting were significantly greater in Pennsylvania (clutch size 4.4; renesting probability 0.66) than in Georgia (clutch size 3.8; renesting probability 0.54). Contrasts of the remaining measures of breeding were not statistically significant, and, in particular, mean daily nest survival in the two study areas was nearly identical (0.974 in Pennsylvania; 0.975 in Georgia). An individual-based model of fecundity (i.e., number of fledged young per adult female), predicted that approximately half of the females in both Pennsylvania and Georgia fledge at least one young, and mean values for fecundity in Pennsylvania and Georgia were 2.28 and 1.91,...

【 授权许可】

CC BY