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Gorges Provide Refugia for Animal Communities in Tropical Savannah Ecosystems

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Gorges Provide Refugia for Animal Communities in Tropical Savannah Ecosystems University of South Florida Digital Commons @ University of South Florida USF St. Petersburg campus Faculty Publications USF Faculty Publications 2015 The Dry Season Shuffle: Gorges Provide Refugia for Animal Communities in Tropical Savannah Ecosystems J. Sean Doody Simon Clulow Geoff Kay Domenic D'Amore David Rhind Follow this and additional works at: https://digitalcommons.usf.edu/fac_publications Part of the Zoology Commons Recommended Citation Doody JS, Clulow S, Kay G, D’Amore D, Rhind D, Wilson S, et al. (2015) The Dry Season Shuffle: Gorges Provide Refugia for Animal Communities in Tropical Savannah Ecosystems. PLoS ONE 10(7): e0131186. https://doi.org/10.1371/journal.pone.0131186 This Article is brought to you for free and open access by the USF Faculty Publications at Digital Commons @ University of South Florida. It has been accepted for inclusion in USF St. Petersburg campus Faculty Publications by an authorized administrator of Digital Commons @ University of South Florida. For more information, please contact [email protected]. RESEARCH ARTICLE The Dry Season Shuffle: Gorges Provide Refugia for Animal Communities in Tropical Savannah Ecosystems J. Sean Doody1,2*, Simon Clulow2, Geoff Kay3, Domenic D’Amore4, David Rhind5, Steve Wilson6, Ryan Ellis7, Christina Castellano8, Colin McHenry5, Michelle Quayle5, Kim Hands9, Graeme Sawyer10, Michael Bass11 1 Department of Ecology & Evolutionary Biology, University of Tennessee, Knoxville, Tennessee, United States of America, 2 School of Environmental and Life Sciences, University of Newcastle, Callaghan, New South Wales, Australia, 3 Fenner School of Environment and Society, Australian National University, a11111 Canberra, Australian Capital Territory, Australia, 4 Department of Natural Sciences, Daemen College, Amherst, New York, United States of America, 5 Department of Anatomy and Developmental Biology, Monash University, Clayton, Victoria, Australia, 6 Queensland Museum, South Brisbane, Queensland, Australia, 7 Department of Terrestrial Zoology, Western Australian Museum, Welshpool, Western Australia, Australia, 8 Utah’s Hogle Zoo, Salt Lake City, Utah, United States of America, 9 Stop the Toad Foundation, West Perth, Australia, 10 Frogwatch NT, Wagaman, Northern Territory, Australia, 11 El Questro Wilderness Park, Kununurra Western Australia, Australia * [email protected] OPEN ACCESS Citation: Doody JS, Clulow S, Kay G, D’Amore D, Rhind D, Wilson S, et al. (2015) The Dry Season Shuffle: Gorges Provide Refugia for Animal Abstract Communities in Tropical Savannah Ecosystems. PLoS ONE 10(7): e0131186. doi:10.1371/journal. In the wet-dry tropics, animal species face the major challenges of acquiring food, water or pone.0131186 shelter during an extended dry season. Although large and conspicuous animals such as Editor: Jordi Moya-Larano, Estacion Experimental de ungulates and waterfowl migrate to wetter areas during this time, little is known of how Zonas Áridas (CSIC), SPAIN smaller and more cryptic animal species with less mobility meet these challenges. We Received: April 18, 2014 fenced off the entire entrance of a gorge in the Australian tropical savanna, offering the unique opportunity to determine the composition and seasonal movement patterns of the Accepted: May 30, 2015 small vertebrate community. The 1.7 km-long fence was converted to a trapline that was Published: July 2, 2015 deployed for 18-21 days during the early dry season in each of two years, and paired traps Copyright: © 2015 Doody et al. This is an open on both sides of the fence allowed us to detect the direction of animal movements. We pre- access article distributed under the terms of the dicted that semi-aquatic species (e.g., frogs and turtles) would move upstream into the wet- Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any ter gorge during the dry season, while more terrestrial species (e.g., lizards, snakes, medium, provided the original author and source are mammals) would not. The trapline captured 1590 individual vertebrates comprising 60 spe- credited. cies. There was a significant bias for captures on the outside of the fence compared to the Data Availability Statement: The data are contained inside for all species combined (outside/inside = 5.2, CI = 3.7-7.2), for all vertebrate classes, within the paper and/or the Supporting Information and for specific taxonomic groups. The opposite bias (inside/outside = 7.3, N= 25) for turtles file. during the early wet season suggested return migration heading into the wet season. Our Funding: The authors have no support or funding to study revealed that the small vertebrate community uses the gorge as a dry season refuge. report. The generality of this unreplicated finding could be tested by extending this type of survey to Competing Interests: Christina Castellano is tropical savannahs worldwide. A better understanding of how small animals use the land- General Curator at Hogle Zoo, and Michael Bass was scape is needed to reveal the size of buffer zones around wetlands required to protect both Wilderness Park Manager at El Questro Wilderness Park. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials. PLOS ONE | DOI:10.1371/journal.pone.0131186 July 2, 2015 1/14 Gorges Provide Refugia for Animal Communities in Tropical Ecosystems semi-aquatic and terrestrial fauna in gorges in tropical savannah woodland, and thus in eco- systems in general. Introduction The wet-dry tropics are characterized by distinct wet and dry seasons and are found on every major continent. While the wet season is often plentiful, the dry season challenges animals to acquire resources or survive over many months with little to no precipitation. For many spe- cies, the wet-dry seasons drive an intra-year ‘boom to bust’ cycle which requires highly special- ized ecological traits to evolve [1, 2]. Understanding how animals respond to dry season conditions is important—we would expect prolonged dry conditions to impact population dynamics and ultimately shape an organism’s physiology, ecology and behavior [3–5]. Reveal- ing these responses is also critical for predicting the impacts of anthropogenic influences on species and population persistence. For example, climate change models predict increases in the length and intensity of dry seasons over large areas such as the Amazon Basin [6]. Generally, animals stressed by prolonged dry conditions can either migrate or aestivate dur- ing the dry season. Many species migrate with the seasonal rhythms in search of water and food, including African ungulates such as wildebeest, gazelles and zebras. As the dry season intensifies, they migrate hundreds of kilometers toward greener pastures, returning with the onset of the wet season several months later [7, 8]. Similarly, many waterfowl species utilize natural and artificial wetlands as alternative refugia as floodplains retract throughout the dry season [9–11]. Less well-known is how smaller and more cryptic vertebrates with less mobility meet the challenge of dry season conditions. Movements of five species of snakes followed retreating water levels during the dry season in seasonally-flooded wetlands [12, 13]. Not surprisingly, many semi-aquatic species that require rainfall and temporary wetlands to breed or feed will often aestivate underground (e.g., frogs, [14]. Fish communities and crocodilians use river channels and permanent lagoons as dry season refugia [15–17], and in smaller systems fish can escape drying conditions by seeking refuge in the burrows of other animals [18, 19]. Mosquitos use non-flowing water bodies as dry season refugia, from which they are able to migrate a few kilometers to feed [20]. Understanding dry season responses in smaller terrestrial vertebrates would be particularly invaluable in Australia, where terrestrial animal communities consist almost entirely of small to medium-sized vertebrates. For example, at a maximum size of <30 kg the dingo, Canis lupus, is Australia’s largest terrestrial predator [21]. The paucity of large native herbivores and predators in Australia focuses attention on small to medium-sized animals when considering the ecology and conservation of vertebrate communities (e.g., [22, 23]. We might expect heterogeneity in the responses of species to dry season conditions within a given animal community, given a diversity of life history strategies. For example, some species such as burrowing frogs might move less horizontally because they can burrow during dry con- ditions. A formal test of the dry season responses of an animal community would require studying movement patterns in a multitude of species spanning the early dry season (e.g., using VHF or GPS-based telemetry). Collectively such studies would be prohibitively costly, both financially and logistically. Alternatively, a large-scale pitfall trapline with paired traps on the inside and outside of the fence could detect any bias in movement direction of a wide range of species in an animal community. This method is often used in determining the timing of PLOS ONE | DOI:10.1371/journal.pone.0131186 July 2, 2015 2/14 Gorges Provide Refugia for Animal Communities in Tropical Ecosystems breeding in amphibians; a bias in capture rates on the outside of a fence indicates movement to the breeding site, whereas the opposite bias reveals post-breeding movements away from the breeding site [24]. We completely fenced off the entrance of a gorge in the Australian tropical savanna escarp- ment, as part of a conservation effort to exclude the invasive cane toad (Rhinella marina), offer- ing a rare opportunity to extensively determine the composition of the small vertebrate community. The 1.7 km-long fence was converted into a pitfall trapline that was employed for 18–21 days during the early dry season in each of two years (2011 and 2012), and paired traps on both sides of the fence allowed us to detect the direction of animal movements. We hypoth- esized that aquatic species (e.g., non-burrowing frogs, turtles) would move upstream into the gorge during the dry season, while more terrestrial species (e.g., lizards, snakes, and mammals) would not.
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