Study

The effects of selective logging on the lizards Kentropyx calcarata, Ameiva ameiva and Mabuya nigropunctata

  • Published source details Lima A.P., Suarez F.I.O. & Higuchi N. (2001) The effects of selective logging on the lizards Kentropyx calcarata, Ameiva ameiva and Mabuya nigropunctata. Amphibia-Reptilia, 22, 209-216.

Actions

This study is summarised as evidence for the following.

Action Category

Thin trees within forests

Action Link
Reptile Conservation

Use selective logging

Action Link
Reptile Conservation
  1. Thin trees within forests

    A replicated, randomized, controlled study in 1987–1997 in tropical forest in Amazonas, Brazil (Lima et al. 2001) found that after killing (‘girdling’) non-commercial tree species of >25 cm trunk diameter, density of one of three lizard species was reduced 12 years later compared to unmanaged areas. Twelve years after non-commercial trees were girdled, striped whiptail lizard Kentropyx calcarata density (1–3 lizards/plot) was reduced compared to in unmanaged areas (4–6 lizards/plot), but density was similar for giant ameiva Ameiva ameiva (girdled: 1–4 individuals/plot; no management: 0–5 individuals/plot) and black-spotted skink Mabuya nigropunctata (girdled: 0–1 individuals/plot; no management: 0–2 individuals/plot). In 1985, non-commercial trees >25 cm diameter at breast height were killed (‘girdled’, see original paper for details) in three forest plots (4 ha each). Lizards were surveyed in girdled plots and three 4 ha plots with no historical management on foot by walking six 200 x 20 m transects in each plot during daytime in August–October 1996 and July 1997. The maximum number of lizards counted/plot was used as a measure of density.

    (Summarised by: Katie Sainsbury)

  2. Use selective logging

    A replicated, randomized, controlled study in 1987–1997 in tropical forest in Amazonas, Brazil (Lima et al. 2001) found that greater selective logging intensity increased the density of one of three lizard species, but density of all three lizard species reduced over time after logging. Black-spotted skink Mabuya nigropunctata density increased with logging intensity, but striped forest whiptail lizard Kentropyx calcarata and giant ameiva Ameiva ameiva densities did not (data are presented as statistical model outputs). Black-spotted skink and giant ameiva densities were higher in plots with trees felled 4 years earlier, compared to plots where trees were felled 9–10 years earlier, or in unmanaged plots. Whiptail lizard density was higher in plots felled 4 years earlier than 9–10 years earlier, but density in plots felled 9–10 years earlier was no different in unmanaged plots (see original paper for details). In three blocks (24 ha each), forest plots (4 ha each) were managed as follows: commercial tree felling using selective logging in 1987 (two plots), in 1988 (one plot), in 1993 (one plot), or no management (one plot). The reduction in wood volume after logging ranged from 44–107 m3/ha (including commercial trees and those accidentally felled/killed by logging operations). Lizards were surveyed on foot by walking six 200 m x 20 m transects in each plot during daytime in August–October 1996 and July 1997. The maximum number of lizards counted/ plot was used as a measure of density.

    (Summarised by: Katie Sainsbury)

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