A simple population viability analysis of the Critically Endangered Euphorbia clivicola R.A. Dyer under four management scenarios

Modelling strategies for the management of the critically endangered Carpentarian rock-rat (Zyzomys palatalis) of northern Australia

“…The interval of 3±5 years suggested by Begg et al (1981) agrees with our results, and other published recommendations (e.g. Silveira et al, 1999;Pfab and Witkowski, 2000;Roques et al, 2001). By contrast, the other management alternatives we simulated were disappointingly ineffective at reducing risk.…”

“…Higher values of SRC indicate a greater sensitivity of model output to changes in a given parameter (the t-and P-values of the regression are also indicative of sensitivity). These six parameters explain 93Á8% of the variation observed in N Lindenmayer and Possingham, 1995;Silveira et al, 1999;Pfab and Witkowski, 2000). Yet long-term ®re suppression can also lead to habitat degradation, threatening those species dependent on moderate levels of disturbance (Breininger et al, 1999).…”

“…PHVA has been successfully employed to determine optimal ®re and habitat management strategies for a range of different species (e.g. Breininger et al, 1999;Richards et al, 1999;Pfab and Witkowski, 2000).…”

Population viability risk management (PVRM) for in situ management of endangered tree species—A case study on a Taxus baccata L. population

“…Applications dealing with risk assessment, hybridisation and management of critically endangered animals, vaccination against infectious diseases, timing and intensity of pest control, frequency and cause of mouse, rat and stoat irruptions in a forest ecosystem, or survival prospects of populations under threat of predation are described (compare Keedwell, 2004). At present population viability analyses for plants are scarce (Pfab and Witkowski, 2000;Menges, 2000). The models and methods vary both in terms of complexity of www.elsevier.com/locate/foreco Available online at www.sciencedirect.com Forest Ecology and Management 255 (2008) [2835][2836][2837][2838][2839][2840][2841][2842][2843][2844][2845] the underlying models and the quantity of data needed to parameterise them (Burgman et al, 1993;Morris et al, 1999;Bessinger, 2002).…”

Using population viability analysis to predict the effect of fire on the extinction risk of an endangered shrub Verticordia fimbrilepis subsp. fimbrilepis in a fragmented landscape

“…Conservation managers can improve the status of threatened species if they have some idea of how populations will respond to different fire regimes, but uncertainty about relative impacts often plagues decisions. Population viability analysis (PVA) is a modeling tool that can help managers to make more informed decisions about prescribing fire for threatened species (Burgman and Lamont 1992;Pfab and Witkowski 2000;Kaye et al 2001;QuintanaAscencio et al 2003;Regan and Auld 2004;Keith 2004;Menges and Quintana-Ascencio 2004). PVA works by using autecological and demographic monitoring data to parameterize a population model.…”