TY - JOUR
T1 - Dung beetles as indicators for rapid impact assessments
T2 - Evaluating best practice forestry in the neotropics
AU - Bicknell, Jake E.
AU - Phelps, Simon P.
AU - Davies, Richard G.
AU - Mann, Darren J.
AU - Struebig, Matthew J.
AU - Davies, Zoe G.
N1 - Funding Information:
Reference collections are deposited in the Centre for the Study of Biological Diversity, University of Guyana and the Hope Entomological Collections, Oxford University Museum of Natural History. We are grateful to M. Barclay at the Natural History Museum who provided sampling equipment for the duration of the project. Fieldwork was funded by the Guiana Shield Initiative, Iwokrama International Centre (IIC), University of East Anglia and the Sir Philip Reckitt Educational Trust. PhD funding was provided by the University of Kent under a 50th anniversary scholarship. Finally, we would like to extend personal thanks to the team at Iwokrama for assistance in the field, and J. Barlow for useful feedback on a previous draft of this manuscript. Research permission was granted by the Guyana Environmental Protection Agency.
PY - 2014/8
Y1 - 2014/8
N2 - Dung beetles (Scarabaeidae: Scarabaeinae) are sensitive to habitat perturbations and are easily studied, making them an ideal taxonomic group with which to evaluate the effects of low-intensity anthropogenic disturbances such as Reduced-Impact Logging. Here we examine the effect of a certified Reduced-Impact Logging operation on dung beetles, and demonstrate their suitability for use in rapid ecological impact studies. We sampled dung beetle assemblages, environmental variables and timber extraction rates across four treatment groups in closed canopy and canopy gaps in logged and unlogged forest in Guyana. Community analysis revealed that logged forest supported a more uniform dung beetle assemblage compared to unlogged forest. Differences in assemblage structure were driven by dissimilarity between closed canopy treatments, as plots in artificial and natural canopy gaps supported comparable assemblages. Indicator analyses were conducted across treatments, using a new approach (CLAM) and two well-established methods (IndVal, SIMPER). Two species respectively were classified as indicators of logged (Hansreia affinis and Eurysternus caribaeus) and unlogged forest (Canthidium aff. centrale and Deltochilum (Calhyboma) carinatum). BIO-ENV analysis demonstrated that tree extraction intensity, bare ground cover, and ground cover by leaf material were key factors influencing dung beetle assemblages. Despite the relatively low-impact of Reduced-Impact Logging reported by previous studies, we find that dung beetles are sensitive to even small changes in environmental conditions as a result of this form of anthropogenic disturbance. As dung beetles are a highly responsive taxonomic group, we illustrate that they represent a valuable taxon that can be used to critically evaluate best practice forestry operations and other disturbance activities, particularly in time constrained studies (e.g., rapid monitoring and environmental impact assessments). However, we recommend the use of multiple indicator analyses to monitor potential changes in assemblage composition, due to a lack of congruence between methods.
AB - Dung beetles (Scarabaeidae: Scarabaeinae) are sensitive to habitat perturbations and are easily studied, making them an ideal taxonomic group with which to evaluate the effects of low-intensity anthropogenic disturbances such as Reduced-Impact Logging. Here we examine the effect of a certified Reduced-Impact Logging operation on dung beetles, and demonstrate their suitability for use in rapid ecological impact studies. We sampled dung beetle assemblages, environmental variables and timber extraction rates across four treatment groups in closed canopy and canopy gaps in logged and unlogged forest in Guyana. Community analysis revealed that logged forest supported a more uniform dung beetle assemblage compared to unlogged forest. Differences in assemblage structure were driven by dissimilarity between closed canopy treatments, as plots in artificial and natural canopy gaps supported comparable assemblages. Indicator analyses were conducted across treatments, using a new approach (CLAM) and two well-established methods (IndVal, SIMPER). Two species respectively were classified as indicators of logged (Hansreia affinis and Eurysternus caribaeus) and unlogged forest (Canthidium aff. centrale and Deltochilum (Calhyboma) carinatum). BIO-ENV analysis demonstrated that tree extraction intensity, bare ground cover, and ground cover by leaf material were key factors influencing dung beetle assemblages. Despite the relatively low-impact of Reduced-Impact Logging reported by previous studies, we find that dung beetles are sensitive to even small changes in environmental conditions as a result of this form of anthropogenic disturbance. As dung beetles are a highly responsive taxonomic group, we illustrate that they represent a valuable taxon that can be used to critically evaluate best practice forestry operations and other disturbance activities, particularly in time constrained studies (e.g., rapid monitoring and environmental impact assessments). However, we recommend the use of multiple indicator analyses to monitor potential changes in assemblage composition, due to a lack of congruence between methods.
KW - CLAM
KW - Forest disturbance
KW - Guyana
KW - Indicator species
KW - IndVal
KW - Reduced-Impact Logging
UR - http://www.scopus.com/inward/record.url?scp=84896909051&partnerID=8YFLogxK
U2 - 10.1016/j.ecolind.2014.02.030
DO - 10.1016/j.ecolind.2014.02.030
M3 - Article
AN - SCOPUS:84896909051
VL - 43
SP - 154
EP - 161
JO - Ecological Indicators
JF - Ecological Indicators
SN - 1470-160X
ER -