The importance of demographic uncertainty: An example from the helmeted honeyeater Lichenostomus melanops cassidix
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Stochastic simulation modelling of southern Great Barrier Reef green turtle population dynamics
2002, Ecological ModellingLessons about extinction and translocation: Models for eastern barred bandicoots (Perameles gunnii) at Woodlands Historic Park, Victoria, Australia
2002, Biological ConservationCitation Excerpt :The delay model includes similar fecundity distributions as in the standard model, except that the fecundity has been calculated from a slightly different adult population given that some of the non-breeding bandicoots are reclassified as sub-adults under delayed development. All models for P. gunnii at Woodlands account for the female component of the population only (McCarthy et al., 1994; McCallum, 1995), as P. gunnii are considered polygynous (Coulson, 1990; Dufty, 1994a) and males are not thought to limit the number of breeding females. The time step for each model is equivalent to 3 months.
Small mammals, habitat patches and PVA models: A field test of model predictive ability
2002, Biological ConservationCitation Excerpt :Habitat loss and the fragmentation of the reduced remaining areas of habitat are regarded by many workers as key factors influencing the distribution and abundance of many species around the world (Andrén, 1994; Bennett, 1998). Many complex and often interacting factors can underpin the response of species to landscape change ranging from: (1) reduced population sizes and, in turn, increased risks of extinction from environmental variation and catastrophic events (Lande, 1993); (2) reduced genetic variation and increased inbreeding (Lacy, 1993a; Saccheri et al., 1998); (3) changed dynamics of individuals within population, such as skewed sex ratios (McCarthy et al., 1994), single-sex patches (Temple and Cary, 1988), and Allee effects (Lacy, 2000a); (4) changed dynamics of interactions between populations (e.g. increased nest predation or nest parasitism at the edges of habitat fragments (Paton, 1994); and (5) changed ecological processes (e.g. pollination or decomposition) that are essential to maintain viable populations of organisms (Klein, 1989). These processes interact (Gilpin and Soulé, 1986), making it difficult to test their effects, particularly at the landscape scale.
Assessing the value of follow-up translocations: A case study using New Zealand robins
2001, Biological ConservationCitation Excerpt :A population with these parameters could therefore potentially persist, but the probability of persistence would depend on demographic and environmental stochasticity. Demographic stochasticity is an important factor in small populations (Boyce, 1992; McCarthy et al., 1994), and is reduced by increasing population sizes and/or evening sex ratios. We therefore wished to estimate the increase in viability that could be achieved by releasing additional females.