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interspecific competition ignored

Posted by andrewt on 15 Aug 2012 at 23:45 GMT

At the outset of this study, we postulated that Common Myna establishment would negatively affect the abundance of cavity-nesting species

The model choice ignores interspecific competition except from mynas. The time series presented show large density changes for other cavity nesters but any effects of these are excluded by the model choice and several of these, for example Sulphur-crested Cockatoos show density changes of similar or larger magnitude than mynahs. This limitation would seem to preclude the model being informative regarding competition between cavity nesters.

No competing interests declared.

RE: interspecific competition ignored

KateRock replied to andrewt on 30 Oct 2012 at 09:21 GMT

We agree that competition by other species may impact native bird populations. However, our analysis focused on bird populations before and after the specific time points of Common Myna establishment. Therefore, our analysis focused on comparing if there was a change in bird populations after a specific time point for each region (when the Common Myna became established).

No model will capture the complete complexities of the natural environment. We encourage investigations into the impact of interspecific completion from other species such as the Noisy Minor.

Competing interests declared: Author