Summary
Data on the relative clutch mass of snakes are summarized for over 100 populations. RCM was significantly lower in live bearing versus egg laying forms. We suggest that the longer reproductive season of viviparous snakes results in higher overall mortality compared to oviparous species; by reducing RCM, viviparous snakes may reduce this risk of mortality. Unlike lizards, no differences in RCM were found between categories of either escape behavior or foraging mode, possibly because detailed information on these behaviors are lacking for most snakes. In four populations examined, RCM did not vary among years. When compared to lizards, snakes demonstrate significantly higher RCM, perhaps owing to a more energetically efficient means of locomotion. Our data support the contention that RCM should be considered a separate and distinctive life-history characteristic of reptiles.
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Seigel, R.A., Fitch, H.S. Ecological patterns of relative clutch mass in snakes. Oecologia 61, 293–301 (1984). https://doi.org/10.1007/BF00379625
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DOI: https://doi.org/10.1007/BF00379625