caa a22 4500 465782620 CHVBK 20180323111959.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF00180298 doi (NATIONALLICENCE)springer-10.1007/BF00180298 Locomotor impairment and defense in gravid lizards ( Eumeces laticeps ): behavioral shift in activity may offset costs of reproduction in an active forager [Elektronische Daten] [William Cooper Jr., Laurie Vitt, Richard Hedges, Raymond Huey] Summary: Female Eumeces laticeps experience a substantial decrease in running speed (ca. 25%) and an even greater loss of endurance (slightly over 50%) while gravid. Because some widely foraging lizards, including E. laticeps, rely primarily on running to escape predators, the decreases in speed and stamina may contribute to an increased risk of predation. However, observations suggest that gravid females become less active or conspicuous on the surface. Ambush foraging lizards rely relatively more on crypsis associated with immobility to avoid predation and thus can have greater average relative clutch mass (RCM) than active foragers. Behavioral compensation for locomotor impairment by becoming less active or conspicuous may allow some species the advantages inherent in both high relative clutch mass when gravid and the increased energetic profitability of active foraging when not gravid. As females gain weight during the breeding season, they may forage actively until the risk due to increasing locomotor impairment becomes too great and then change defensive strategy to greater reliance on crypsis. Without such a shift, widely foraging squamate reptiles may be less able than ambush foragers to exploit life-historical strategies demanding high current investment in reproduction. Springer-Verlag, 1990 Cooper Jr. William Department of Biology, Auburn University at Montgomery, 36117, Montgomery, AL, USA aut Vitt Laurie Department of Biology, University of California, 90024, Los Angeles, CA, USA aut Hedges Richard Department of Zoology NJ-15, University of Washington, 98195, Seattle, WA, USA aut Huey Raymond Department of Zoology NJ-15, University of Washington, 98195, Seattle, WA, USA aut Behavioral Ecology and Sociobiology Springer-Verlag 27/3(1990-09-01), 153-157 0340-5443 27:3<153 1990 27 265 https://doi.org/10.1007/BF00180298 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00180298 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cooper Jr William Department of Biology, Auburn University at Montgomery, 36117, Montgomery, AL, USA aut NATIONALLICENCE 700 1- Vitt Laurie Department of Biology, University of California, 90024, Los Angeles, CA, USA aut NATIONALLICENCE 700 1- Hedges Richard Department of Zoology NJ-15, University of Washington, 98195, Seattle, WA, USA aut NATIONALLICENCE 700 1- Huey Raymond Department of Zoology NJ-15, University of Washington, 98195, Seattle, WA, USA aut NATIONALLICENCE 773 0- Behavioral Ecology and Sociobiology Springer-Verlag 27/3(1990-09-01), 153-157 0340-5443 27:3<153 1990 27 265 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer