The ecology and conservation of Hadramphus tuberculatus (Pascoe 1877) (Coleoptera: Curculionidae: Molytinae)

作者：Fountain Emily D^*; Wiseman Benjamin H; Cruickshank Robert H; Paterson Adrian M

来源：Journal of Insect Conservation, 2013, 17(4): 737-745.

DOI：10.1007/s10841-013-9557-9

• Canterbury knobbled weevil
• Hadramphus tuberculatus
• Mark-recapture
• New Zealand
• Captive rearing
• Critically endangered

The critically endangered weevil, Hadramphus tuberculatus (Pascoe 1877), was considered extinct until its rediscovery in 2004. Once widespread throughout the Canterbury Plains, currently the only known population is at Burkes Pass Scenic Reserve, Canterbury, New Zealand. Little information regarding the ecology and behaviour of this species has been recorded. A mark-recapture study was conducted over 3 years (2009-2011) to obtain more information on the population size, sex-ratio, and weevil movement within the reserve. Non-lethal pitfall traps were used for live capture of H. tuberculatus; weevils were measured, sexed, photographed, and given a unique ID on the elytra. Analysis of the mark-recapture data indicated a decrease in population size over the 3 years with estimated population sizes of 138 in 2009, 90 in 2010 and 76 in 2011. The sex-ratio of the population was even. In addition to mark-recapture, methods of captive rearing were explored. The results from this study will be used to assist conservation of H. tuberculatus and provide valuable information for developing an ex situ breeding program. We suggest that the population is vulnerable and must be carefully managed if extinction is to be avoided.

• 出版日期2013-8