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1 January 2017 Badge Size of Male Eurasian Tree Sparrows Passer montanus Correlates with Hematocrit During the Breeding Season
Shin Matsui, Satoe Kasahara, Takahiro Kato, Hiroe Izumi, Gen Morimoto, Keisuke Ueda, Osamu K. Mikami
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Abstract

We investigated whether the badge size of the Eurasian Tree Sparrow Passer montanus is correlated with morphological traits and hematocrit during the breeding season in order to elucidate the function of badge size as a potential signal of body size and physiological condition. We found a positive correlation in males between badge size and hematocrit, but not in females. As individuals with larger hematocrit values can transport more oxygen to their tissues or organs, male badge size may be linked with oxygen transport ability. We suggest that male badge size may be a signal of physiological status.

© The Ornithological Society of Japan 2017
Shin Matsui, Satoe Kasahara, Takahiro Kato, Hiroe Izumi, Gen Morimoto, Keisuke Ueda, and Osamu K. Mikami "Badge Size of Male Eurasian Tree Sparrows Passer montanus Correlates with Hematocrit During the Breeding Season," Ornithological Science 16(1), 87-91, (1 January 2017). https://doi.org/10.2326/osj.16.87
Received: 28 November 2015; Accepted: 1 July 2016; Published: 1 January 2017
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