Abstract
ABSTRACTI studied the reproduction of the 9 g nectarivorous bat Glossophaga commissarisi (Phyllostomidae: Glossophaginae) in relation to its food choice in a Costa Rican lowland rain forest over more than 2 yr. Reproduction was bimodal with birth peaks in April/May and October/November. The first birth peak coincided with a period of frugivory, whereas the second occurred during a period of almost exclusive nectarivory. All adult females recaptured in consecutive reproductive periods were reproductively active on both occasions, indicating that individual G. commissarisi females regularly reproduce twice per year at the study site. Throughout the annual cycle the mean testis length of the males correlated best with the proportion of females lactating, suggesting a post partum estrous pattern. Animals became reproductively active at about 1 yr of age. Fecal samples showed that females consumed significantly more insects than males.
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