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When we multiply this Lefkovitch matrix by a vector of stage groups, then the use of the two sets of diagonals allows some indiv ...
that might be taken. In the case of loggerheads, for example, it might be possible to protect nesting sites on beaches or altern ...
The stable age distribution for the loggerhead turtle can be readily calculated from the right eigen- vector of the transition m ...
where the T means that we are transposing the vector, so that it is now a row, rather than a column, vector. Stage-specific repr ...
The dynamic behavior of a population – whether it increases, decreases, or remains constant – is determined by its age- or stage ...
Model evaluation and adaptive management 15 In ecology, a modelis a hypothesis that is usually expressed mathematically. A math- ...
yields a statistically significant result (that is, yields a Pvalue less than 0.05), this may be of trivial biological significa ...
There are a great many ways that we can interpret underlying causes of this population growth. Ecological interactions among wil ...
increasing wildebeest abundance, so one obvious model candidate would be a linear decline in rwith N. In mathematical terms, thi ...
sample size that we will call n). For each of these n estimates of r, we can calculate the deviation, residi, around the regress ...
The profile curve shown in Fig. 15.3 is useful in demonstrating how the negative log-likelihood would change with different para ...
number of parameters are available to model the data. On the other hand, the AIC approach applies a penalty to each parameter pi ...
From this we obtain the residual standard deviation: σ=0.04 The likelihood calculation for the theta logistic model is calculate ...
The Gompertz model is based on a logarithmic curvilinear relationship between r and N, which is steepest at small values of N, b ...
There are three parameters, because we estimated α, β, and the residual variation in r: p 3 = 3 AIC 3 =−38.236 As our final mode ...
There are two parameters, because we estimated the mean and residual variation in r: p 4 =^2 AIC 4 =−30.692 The model with the l ...
of their AIC scores. A wise researcher or wildlife manager would consult all of the models whose ∆AIC values were within a diffe ...
One unfortunate aspect of this terminology is that “active” seems a great deal more attractive than “passive” adaptive managemen ...
resource users, should several models continue to make similar predictions. For another, passive management makes it difficult t ...
correct is through active adaptive management (Nichols et al. 1995; Williams et al. 1996). Indeed, this may be the only realisti ...
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