Abstract
The present distribution of Mecodema howitti, a threatened forest carabid endemic to Banks Peninsula, Canterbury, New Zealand, was assessed by surveying native forest remnants and sites with podocarp/hardwood logs remaining in grassland after forest clearance. Environmental features and land use practices at the surveyed sites were analysed in relation to M. howitti presence. Survey results were compared with historical distribution data from museum specimen records for evidence of range contraction. Museum specimen data and anecdotal reports indicated M. howitti was originally present across Banks Peninsula. Survey results revealed it is now restricted to the central and eastern parts of the Peninsula. Factors influencing its distribution are discussed. Mecodema howitti was found in native podocarp/hardwood and mixed hardwood forest remnants, and under logs remaining in grassland at mid and high altitudes. The presence of this species in forest remnants was positively associated with log abundance and low habitat disturbance levels. A long-term periodic monitoring scheme should be established to determine whether the range of this threatened species is still contracting.
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