BODY-SIZE AND CONDITION, AGE, PLUMAGE QUALITY, AND FOODS OF PRENESTING MALE CINNAMON TEAL IN RELATION TO PAIR STATUS

Male-biased sex ratios in waterfowl may contribute to sexual selection and permit females to be the deciding sex in mate selection. Male cha racteristics potentially influencing female choice include male age, s ize, plumage quality, and body condition (i.e., relative body mass, fa t content, or protein content). By examining characteristics of prenes ting male cinammon teal (Anas cyanoptera) relative to their pair statu s we evaluated the predictions that (i) paired males are older and phy sically superior to unpaired males and (ii) older and physically super ior males pair in advance of other males. Diets of paired and unpaired males were similar, as were body size, ingesta-free body mass, fat, b reast, and leg muscle protein contents, and testis, liver, and plumage masses. Likewise, pair status was not associated with male age. Body protein content and percentage of alternate plumage were generally gre ater in paired than unpaired males, but for some unpaired individuals these values were higher than the mean values for paired males. Thus, we found only limited evidence to support the above hypotheses. Our da ta suggest a possible link between winter nutrition and male participa tion in reproduction. That is, characteristics which enable males, dur ing winter, to acquire nutrients for initiating and completing the pre alternate molt in advance of other males also may be associated with a bility to obtain a mate.