Anthropogenically modified habitats favor bigger and bolder lizards. Issue 4 (31st January 2021)

• Record Type: Journal Article
• Authors: Pettit, Lachlan; Brown, Gregory P.; Ward‐Fear, Georgia; Shine, Richard
• Is Part Of: Ecology and evolution. Volume 11:Issue 4(2021)
• Page Start: 1586
• Page End: 1597
• Publication Date: 2021-01-31
• Subjects: intraspecific -- niche partitioning -- resource subsidy -- Varanidae; Ecology -- Periodicals; Evolution -- Periodicals; 577.05
• DOI: 10.1002/ece3.7124
• Languages: English
• ISSNs: 2045-7758

Abstract

Abstract: Anthropogenic activities often create distinctive but discontinuously distributed habitat patches with abundant food but high risk of predation. Such sites can be most effectively utilized by individuals with specific behaviors and morphologies. Thus, a widespread species that contains a diversity of sizes and behavioral types may be pre‐adapted to exploiting such hotspots. In eastern Australia, the giant (to >2 m) lizard Varanus varius (lace monitor) utilizes both disturbed (campground) and undisturbed (bushland) habitats. Our surveys of 27 sites show that lizards found in campgrounds tended to be larger and bolder than those in adjacent bushland. This divergence became even more marked after the arrival of a toxic invasive species (the cane toad, Rhinella marina ) caused high mortality in larger and bolder lizards. Some of the behavioral divergences between campground and bushland lizards may be secondary consequences of differences in body size, but other habitat‐associated divergences in behavior are due to habituation and/or nonrandom mortality. Abstract : Lace monitors ( Varanus varius ) are keen exploiters of anthropogenically disturbed habitat; however, only a subset of morphological and behavioral phenotypes in this species favor these artificial environments (i.e., large, bold individuals). The arrival of a toxic invader ( Rhinella marina ) may further exacerbate phenotypic divergences.