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A nomadic avian predator displays flexibility in prey choice during episodic outbreaks of rodents in arid Australia

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Abstract

In environments driven by unpredictable resource pulses, populations of many consumer species experience dramatic fluctuations in abundance and spatial extent. Predator–prey relationships in these acyclic systems are poorly understood in particular with respect to the level of prey specialisation shown by nomadic predators. To understand the dynamics of such a system I examined the response to rodent outbreaks by the letter-winged kite (Elanus scriptus) in the Simpson Desert, Australia; a region that experiences major pulses in primary productivity, driven by unpredictable rainfall events. The kite feeds on small mammals and is the only night-hunting species in the Accipitridae. Letter-winged kites irrupted in the area on only three occasions during 20 years of sampling (1999–2019) and remained for a maximum of 20 months. Each period of kite occupation occurred only during the increase and/or peak phase of rodent population cycles (which occurred three times during the study). During each period kite diet was dominated by small (10–50 g body mass) quadrupedal rodents (Pseudomys australis, P. hermannsburgensis, Mus musculus). Abundance of these species varied across the three outbreaks and kites typically captured them in proportion to availability. The large body mass (134 g) long-haired rat (Rattus villosissimus) was abundant during one outbreak but was infrequently consumed. The bipedal spinifex hopping-mouse (Notomys alexis) was within the kites’ favoured prey size range (35 g) but was consistently avoided. The flexibility in prey selection by letter-winged kites appears to be an important adaptation for survival and reproduction by species exploiting acyclic rodent outbreaks.

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Acknowledgements

I thank the Costello family for allowing access to the field sites. I appreciate the field assistance provided by many dedicated people over the 20 years of research. I thank G. Storey from Scats About for identifying the 2011 and 2016–2017 pellet samples. M. Heywood, J. Gorman, J. Cole and J. Hughes assisted with the identification of 2001–2002 pellet samples. S. Raghu assisted with data analysis. M. Gilfedder, L. Joseph and E. Vanderduys and two anonymous reviewers provided comments on the manuscript. All applicable institutional and/or national guidelines for the care and use of animals were followed. Ethics approval was obtained from Charles Darwin University Animal Ethics Committee (Number A07010) and CSIRO (Numbers 2012–03 and 2015–18).

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  1. CSIRO Land and Water, Winnellie, PMB 44, Darwin, NT, 0822, Australia

    Chris R. Pavey

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  1. Chris R. Pavey
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CRP conceived, designed, and executed this study and wrote the manuscript. No other person is entitled to authorship.

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Correspondence to Chris R. Pavey.

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Communicated by Janne Sundell.

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Pavey, C.R. A nomadic avian predator displays flexibility in prey choice during episodic outbreaks of rodents in arid Australia. Oecologia 196, 211–222 (2021). https://doi.org/10.1007/s00442-021-04926-7

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