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The Island Syndrome and Population Dynamics of Introduced Rats

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The Island Syndrome and Population Dynamics of Introduced Rats Oecologia (2011) 167:667–676 DOI 10.1007/s00442-011-2031-z POPULATION ECOLOGY - ORIGINAL PAPER The island syndrome and population dynamics of introduced rats James C. Russell • David Ringler • Aure´lien Trombini • Matthieu Le Corre Received: 20 October 2010 / Accepted: 13 May 2011 / Published online: 5 June 2011 Ó Springer-Verlag 2011 Abstract The island syndrome predicts directional Mozambique Channel and were consistent with predictions changes in the morphology and demography of insular from the island syndrome. The manifestation of an island vertebrates, due to changes in trophic complexity and syndrome in rodents depends upon the trophic composition migration rates caused by island size and isolation. How- of a community, and may not relate to island size alone ever, the high rate of human-mediated species introduc- when many species additions, such as invasions, have tions to some islands also increases trophic complexity, and occurred. The differing patterns of rodent population this will reduce the perceived insularity on any such island. dynamics on each island provide information for future We test four hypotheses on the role of increased trophic rodent eradication operations. complexity on the island syndrome, using introduced black rats (Rattus rattus) on two isolated coral atolls in the Keywords Body-size Á Demography Á Density Á Mozambique Channel. Europa Island has remained rela- Rattus rattus Á Spatially explicit capture–recapture tively pristine and insular, with few species introductions, whereas Juan de Nova Island has had many species intro- ductions, including predators and competitors of rats, an- Introduction thropogenically increasing its trophic complexity. In the most insular environments, the island syndrome is expected Changes in the ecological and evolutionary processes to generate increases in body size and densities of rodents within insular populations following colonisation are col- but decreases in the rates of reproduction and population lectively referred to as the island syndrome (Adler and cycling. Morphology and reproduction were compared Levins 1994; Blondel 2000). The island syndrome is driven using linear regression and canonical discriminant analysis, by differences in island size and isolation, relative to other while density and population cycling were compared using islands or continental mainlands, which occur through spatially explicit capture–recapture analysis. Results were island size determining the level of habitat and trophic compared to other insular black rat populations in the complexity, while isolation controls the rate of migration to and from islands. Changes that take place as part of the syndrome occur in morphology, demography and behav- Communicated by Jo¨rg Ganzhorn. iour (Blondel 2000). Changes in body size and morpho- logical traits, the ‘island rule’, have received particular J. C. Russell Á D. Ringler Á A. Trombini Á M. Le Corre attention (e.g. Pergams and Ashley 2001; Palkovacs 2003; ECOMAR, Universite´ de la Re´union, Millien and Damuth 2004; Lomolino 2005; Meiri et al. 15 avenue Rene´ Cassin, 97715 Saint Denis, France 2008), and for mammals can depend on whether the species Present Address: is a carnivore (Meiri et al. 2005) or herbivore (Raia and J. C. Russell (&) Meiri 2006), and how it interacts with its predators, prey or School of Biological Sciences, Department of Statistics, competitors. University of Auckland, Private Bag 92019, Auckland, New Zealand Understanding what drives the island syndrome allows e-mail: [email protected] the impacts of future community and environmental 123 668 Oecologia (2011) 167:667–676 changes on islands to be more robustly predicted. This a result of a high rate of species introductions to one atoll. especially has application in the face of adaptation to We compare Europa Island, which has remained relatively widespread human-driven global change (Vitousek et al. natural, with Juan de Nova Island, which has had its trophic 1997; Gillespie et al. 2008), and particularly the increase in complexity anthropogenically increased by the introduc- species richness on islands due to biological invasions (Sax tion of novel species including mammals, land birds and et al. 2002). The net increase in species richness that occurs plants. For introduced mammals, any distance effect is on islands as a result of species introductions can be factored out due to complete oceanic isolation, such that expected to increase the number of trophic interactions on non-volant mammals cannot naturally disperse (Russell an island (Zavaleta et al. 2000; Tylianakis et al. 2008). et al. 2004), while the sizes of both islands lie within a Ultimately, this might mean that, even when an island similar order of magnitude. We expect rats on the pristine is completely isolated, insularity is not solely defined by island (Europa) to behave more like an insular population, area but also depends upon the species richness and iden- and on the island with anthropogenically increased species tity of constituent community members, both native and richness (Juan de Nova) more like a continental population, introduced. regardless of original island size. We test four hypotheses Rodent populations have been a valuable model for of the island syndrome which we expect to differ predict- generating and testing theories of population dynamics ably between the two islands; (1) morphology, (2) repro- (Krebs 1999; Hanski et al. 2001), but most studies come duction, (3) density and (4) cycling. The island syndrome from continental systems (e.g. Singleton et al. 1999; but predicts that on more trophically complex islands the see Foster 1964; Gliwicz 1980) in temperate environments number of inter- and intra-trophic interactions (e.g. pre- (Krebs 1999). For rodents, the island syndrome predicts dation and competition) will be greater. These interactions that traits such as body size and density are expected to are expected to generate feedbacks limiting body-size and increase, whereas rates of reproduction and population density in small rodent populations, while elongating cycling are expected to decrease (Adler and Levins 1994). breeding seasons and de-stabilising (fluctuating) population Introduced rats (Rattus rattus, R. norvegicus and R. exu- cycles (see Adler and Levins 1994). Following the island lans) are distributed on over 80% of the world’s archipel- syndrome, we therefore expect rat morphology (1) and agos (Atkinson 1985) and have made important density (3) to be greater on Europa, whereas we expect contributions to testing ecological hypotheses (Tamarin reproduction (2) and population cycling (4) to be greater on and Malecha 1971; Clark 1980; Cheylan et al. 1998; Harris Juan de Nova. and Macdonald 2007). Hypotheses from the island syn- drome could be widely tested using introduced rats. Introduced rats are able to be compared, as a natural Materials and methods experiment, on a great variety of island areas, habitats, climates and trophic regimes, all factors known to affect Sites their distributions and population dynamics (Russell and Clout 2004). Rat introductions have been relatively recent Europa (2,223 ha; 22°210S, 40°210E) and Juan de Nova (usually within the past few centuries) and so comparisons (561 ha; 17°030S, 42°450E) are two low-lying (\10 m can be made knowing that adaptations have occurred elevation) coralline atolls in the Mozambique Channel within ecological time-scales. Additionally, the genus (Fig. 1). Both islands are French overseas territories, part Rattus is morphologically conservative (Rowe et al. 2011), of the Iˆles E´ parses (‘scattered islands’) managed by the and so differences in body morphology and condition are Terres Australes et Antractiques Franc¸aises (TAAF). The likely to reflect ecological adaptations to local environ- islands are subject to a productive cyclonic season in the ments. Studies of the ecological and evolutionary processes Austral summer [November–April, mean 6-monthly in introduced rat populations can also provide important cumulative rainfall 480.9 mm (2000–2008)] and a dry data for conservation management, where factors such as season in the Austral winter [May–October, mean predator size affect impacts on the recipient community 6-monthly cumulative rainfall 72.1 mm (2000–2008)]. (Jones et al. 2008) or where control programmes favour Temperature is relatively constant [monthly mean 26.6°C, targeting rats during non-breeding periods at lowest den- range 22.2–29.5 (2000–2008)], and monthly rainfall and sities (Innes et al. 2001). temperature are strongly correlated between the islands We consider two coral atolls in the Mozambique (r = 0.88 and 0.95, respectively). On Europa, black rats Channel which, despite their biogeographic similarities, are are the only introduced mammalian predator, although they notable for their differing rodent population dynamics. co-exist with goats (Capra hircus) and a small population Given both islands are fully isolated, we explore the effect (approx. 30 pairs) of barn owls (Tyto alba), all present of increased trophic complexity on the island syndrome, as since at least 1860. On Juan de Nova, cats (Felis catus), 123 Oecologia (2011) 167:667–676 669 Fig. 1 Western Indian Ocean Islands with Juan de Nova and Europa inset. Buildings and airstrips are indicated black rats and mice (Mus musculus) have all been present macrostachyum and 1.50-m-high Tournefortia argentea. since at least the middle of the twentieth century. Both Cats are present across the island at a density of approxi- islands are classified as uninhabited, but since 1973, French mately 10 ha-1 and mice are widespread and abundant. military patrols (15 people) have been regularly stationed Many other species of land birds, invertebrates and plants on each. have been introduced during the course of twentieth cen- On Europa, the north-western area of the island about tury inhabitation. Overall, the vegetation of the island has the airstrip is dominated by 850 ha of 5-m-high canopy dry been almost completely modified by human activities and indigenous forest composed of Euphorbia stenoclada and less than 20% of the plant species are native (V. Boulet, Ficus marmorata.
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