Browsing by Author "Rebelo, Alexander Douglas"

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    Movement of the Cape dwarf chameleon (Bradypodion pumilum): are they vulnerable to habitat fragmentation?
    (2014) Rebelo, Alexander Douglas; Tolley, Krystal A; Altwegg, Res
    Habitat fragmentation threatens the persistence of natural populations globally. Dispersal between populations can mitigate the negative impacts of habitat fragmentation. The Cape dwarf chameleon (Bradypodion pumilum) occupies heavily fragmented habitat and yet few studies have investigated their ability to disperse and thus persist. In this study I monitored chameleon movements and habitat use in the semi-transformed Noordhoek Wetlands, South Africa. Radio-telemetry was used to track adult chameleons (N=11) over 10 days during March 2010 and April 2014. Data were analysed using linear mixed effects models including relevant predictor variables. The chameleon habitat use, such as perch height, thickness and vegetation cover, including their GPS positions, was recorded hourly during the day. The increase in area used by chameleons over time increased at a relatively constant rate. Male and females showed similar areas of utilisation and daily displacement. However, males perched in higher, in less dense vegetation and on relatively thicker stems than females, although the latter two were not statistically supported. Additionally, chameleon vegetation use varied between day and night, but not between early morning, midday and late afternoon, where chameleons perched in higher and less dense vegetation at night than during the day. Habitats surrounded by wide spaces devoid of vegetation could isolate populations of Cape dwarf chameleons. However, the chameleon movement is unhindered by constraints of territory and by connecting habitat fragments together with corridors of suitable vegetation, the effects of fragmentation could be mitigated.