Modelling the growth and population dynamics of the exiled Stockton coal plateau landsnail, Powelliphanta augusta

作者：James A F; Brown R; Weston K A^*; Walker K

来源：New Zealand Journal of Zoology, 2013, 40(3): 175-185.

DOI：10.1080/03014223.2012.723012

• captive management
• growth model
• invertebrates
• land snail
• New Zealand
• Powelliphanta
• size spectra

Almost all individuals from the only remaining population of a newly discovered species of large land snail were taken into captivity when their habitat was mined in 2007. Growth rates and population dynamics of a sample of 318 of the snails remaining in captivity in 2007-2009 were calculated and compared with those of the wild population at the time it was removed using both deterministic and stochastic modelling methods. Snails in the captive population appeared to be exhibiting slower growth, particularly amongst hatchlings, than the wild population and, although adult mortality is low in captivity, the hatchling mortality rates were higher than expected. Furthermore, we found the predicted long-term size distribution for the captive population differed markedly from that of the population at capture, suggesting the dynamics of captive population are significantly different from those of the wild.

• 出版日期2013-9-1