Resistance and resilience: Can the abrupt end of extreme drought reverse avifaunal collapse?

Joanne M Bennett, Dale G Nimmo, Rohan H Clarke, James R Thomson, Garry Cheers, Gregory F. B. Horrocks, Mark Hall, James Q Radford, Andrew F Bennett, Ralph Mac Nally

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Aim: Climate change is expected to increase the frequency and intensity of extreme climatic events, such as severe droughts and intense rainfall periods. We explored how the avifauna of a highly modified region responded to a 13-year drought (the ‘Big Dry’), followed by a two-year period of substantially higher than average rainfall (the ‘Big Wet’).
Location: Temperate woodlands in north central Victoria, Australia.
Methods: We used two spatially extensive, long-term survey programmes, each of which was repeated three times: early and late in the Big Dry, and in the Big Wet. We compared species-specific changes in reporting rates between periods in both programmes to explore the resistance (the ability to persist during drought) and resilience (extent of recovery post-drought) of species to climate extremes.
Results: There was a substantial decline in the reporting rates of 42–62%(depending on programme) of species between surveys conducted early and late in the Big Dry. In the Big Wet, there was some recovery, with 21–29% of spe-cies increasing substantially. However, more than half of species did not recover and 14–27% of species continued to decline in reporting rate compared with early on in the Big Dry. Species’ responses were not strongly related to ecologi-cal traits. Species resistance to the drought was inversely related to resilience in the Big Wet for 20–35% of the species, while 76–78% of species with low resis-tance showed an overall decline across the study period.
Conclusions: As declines occurred largely irrespective of ecological traits, this suggests a widespread mechanism is responsible. Species that declined the most during the Big Dry did not necessarily show the greatest recoveries. In already much modified regions, climate extremes such as extended drought will induce on-going changes in the biota.
Original languageEnglish
Pages (from-to)1321-1332
Number of pages12
JournalDiversity and Distributions
Volume20
Issue number11
Early online date08 Jul 2014
DOIs
Publication statusPublished - Nov 2014

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