Abstract
Resources are seldom distributed equally across space, but many species exhibit spatially synchronous population dynamics. Such synchrony suggests the operation of large-scale external drivers, such as rainfall or wildfire, or the influence of oasis sites that provide water, shelter, or other resources. However, testing the generality of these factors is not easy, especially in variable environments. Using a long-term dataset (13–22 years) from a large (8000 km2) study region in arid Central Australia, we tested firstly for regional synchrony in annual rainfall and the dynamics of six reptile species across nine widely separated sites. For species that showed synchronous spatial dynamics, we then used multivariate follow a multivariate auto-regressive state–space (MARSS) models to predict that regional rainfall would be positively associated with their populations. For asynchronous species, we used MARSS models to explore four other possible population structures: (1) populations were asynchronous, (2) differed between oasis and non-oasis sites, (3) differed between burnt and unburnt sites, or (4) differed between three sub-regions with different rainfall gradients. Only one species showed evidence of spatial population synchrony and our results provide little evidence that rainfall synchronizes reptile populations. The oasis or the wildfire hypotheses were the best-fitting models for the other five species. Thus, our six study species appear generally to be structured in space into one or two populations across the study region. Our findings suggest that for arid-dwelling reptile populations, spatial and temporal dynamics are structured by abiotic events, but individual responses to covariates at smaller spatial scales are complex and poorly understood.
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References
Ahumada JA, Lapointe D, Samuel MD (2004) Modeling the population dynamics of Culex quinquefasciatus (Diptera: Culicidae), along an elevational gradient in Hawaii. J Med Entomol 41:1157–1170
Bjornstad ON (2013) Ncf: spatial nonparametric covariance functions. R package version 1.1-5
Bjørnstad ON, Ims RA, Lambin X (1999) Spatial population dynamics: analyzing patterns and processes of population synchrony. Trends Ecol Evol 14:427–432
Bureau of Meteorology (2012) Climate data online. Commonwealth of Australia, http://www.bom.gov.au/climate/data/, Accessed on: 20th June 2012
Cattadori IM, Haydon DT, Hudson PJ (2005) Parasites and climate synchronize red grouse populations. Nature 433:737–741
Cattanéo F, Hugueny B, Lamouroux N (2003) Synchrony in brown trout, Salmo trutta, population dynamics: a ‘Moran effect’ on early-life stages. Oikos 100:43–54
Daly BG, Dickman CR, Crowther MS (2007) Selection of habitat components by two species of agamid lizards in sandridge desert, central Australia. Aust Ecol 32:825–833
Daly BG, Dickman CR, Crowther MS (2008) Causes of habitat divergence in two species of agamid lizards in arid central Australia. Ecology 89:65–76
Dickman CR, Letnic M, Mahon PS (1999a) Population dynamics of two species of dragon lizards in arid Australia: the effects of rainfall. Oecologia 119:357–366
Dickman CR, Mahon PS, Masters P, Gibson DF (1999b) Long-term dynamics of rodent populations in arid Australia: the influence of rainfall. Wildl Res 26:389–403
Dickman CR, Greenville AC, Tamayo B, Wardle GM (2011) Spatial dynamics of small mammals in central Australian desert habitats: the role of drought refugia. J Mammal 92:1193–1209
Doherty TS, Dickman CR, Nimmo DG, Ritchie EG (2015) Multiple threats, or multiplying the threats? Interactions between invasive predators and other ecological disturbances. Biol Conserv 190:60–68
Downes S (2001) Trading heat and food for safety: costs of predator avoidance in a lizard. Ecology 82:2870–2881
Downey FJ, Dickman CR (1993) Macro- and microhabitat relationships among lizards of sandridge desert in central Australia. In: Lunney D, Ayers D (eds) Herpetology in Australia: a diverse discipline. Royal Zoological Society of New South Wales, Sydney, pp 133–138
Driscoll DA, Smith AL, Blight S, Maindonald J (2012) Reptile responses to fire and the risk of post-disturbance sampling bias. Biodivers Conserv 21:1607–1625
Ernest SKM, Brown JH, Parmenter RR (2000) Rodents, plants, and precipitation: spatial and temporal dynamics of consumers and resources. Oikos 88:470–482
Evans MEK, Holsinger KE, Menges ES (2010) Fire, vital rates, and population viability: a hierarchical Bayesian analysis of the endangered Florida scrub mint. Ecol Monogr 80:627–649
Free CL, Baxter GS, Dickman CR, Leung LKP (2013) Resource pulses in desert river habitats: productivity-biodiversity hotspots, or mirages? PLoS One 8:e72690
Friend GR, Smith GT, Mitchell DS, Dickman CR (1989) Influence of pitfall and drift fence design on capture rates of small vertebrates in semi-arid habitats of Western Australia. Aust Wildl Res 16:1–10
Gordon CE, Dickman CR, Thompson MB (2010) Partitioning of temporal activity among desert lizards in relation to prey availability and temperature. Aust Ecol 35:41–52
Greenville AC (2015) The role of ecological interactions: how intrinsic and extrinsic factors shape the spatio-temporal dynamics of populations PhD thesis. University of Sydney, Sydney
Greenville AC, Dickman CR (2005) The ecology of Lerista labialis (Scincidae) in the Simpson Desert: reproduction and diet. J Arid Environ 60:611–625
Greenville AC, Dickman CR (2009) Factors affecting habitat selection in a specialist fossorial skink. Biol J Linn Soc 97:531–544
Greenville AC, Dickman CR, Wardle GM, Letnic M (2009) The fire history of an arid grassland: the influence of antecedent rainfall and ENSO. Int J Wildland Fire 18:631–639
Greenville AC, Wardle GM, Dickman CR (2012) Extreme climatic events drive mammal irruptions: regression analysis of 100-year trends in desert rainfall and temperature. Ecol Evol 2:2645–2658
Greenville AC, Wardle GM, Dickman CR (2013) Extreme rainfall events predict irruptions of rat plagues in central Australia. Aust Ecol 38:754–764
Greenville AC, Wardle GM, Nguyen V, Dickman CR (2016) Population dynamics of desert mammals: similarities and contrasts within a multispecies assemblage. Ecosphere 7:e01343
Hanski I, Woiwod IP (1993) Spatial synchrony in the dynamics of moth and aphid populations. J Anim Ecol 62:656–668
Haynes RS (1996) Resource partitioning and demography of twelve sympatric skinks (Ctenotus) in the Simpson Desert. Honours thesis. University of Sydney, Sydney
Hinrichsen RA, Holmes EE (2009) Using multivariate state-space models to study spatial structure and dynamics. In: Cantrell RS, Cosner C, Ruan S (eds) Spatial Ecology. CRC/Chapman Hall, London, pp 1–20
Holmes EE, Ward EJ, Scheuerell MD (2012a) Analysis of multivariate time-series using the MARSS package. NOAA Fisheries, Seattle
Holmes EE, Ward EJ, Wills K (2012b) MARSS: multivariate autoregressive state-space models for analyzing time-series data. R J 4:11–19
Ims RA, Andreassen HP (2000) Spatial synchronization of vole population dynamics by predatory birds. Nature 408:194–196
Kendall BE, Bjørnstad ON, Bascompte J, Keitt TH, Fagan WF (2000) Dispersal, environmental correlation, and spatial synchrony in population dynamics. Am Nat 155:628–636
Koenig WD (2002) Global patterns of environmental synchrony and the Moran effect. Ecography 25:283–288
Koenig WD, Knops JMH (2000) Patterns of annual seed production by northern hemisphere trees: a global perspective. Am Nat 155:59–69
Kok OB, Nel JAJ (1996) The Kuiseb River as a linear oasis in the Namib desert. Afr J Ecol 34:39–47
Letnic M, Dickman CR, Tischler MK, Tamayo B, Beh C-L (2004) The responses of small mammals and lizards to post-fire succession and rainfall in arid Australia. J Arid Environ 59:85–114
Masters P, Dickman CR (2012) Population dynamics of Dasycercus blythi (Marsupialia: Dasyuridae) in central Australia: how does the mulgara persist? Wildl Res 39:419–428
Moran P (1953) The statistical analysis of the Canadian lynx cycle. Aust J Zool 1:291–298
Morton SR et al (2011) A fresh framework for the ecology of arid Australia. J Arid Environ 75:313–329
Myers JH (1998) Synchrony in outbreaks of forest Lepidoptera: a possible example of the Moran effect. Ecology 79:1111–1117
NAFI (2013) North Australian Fire Information. http://www.firenorth.org.au/nafi2/. Accessed on: 12th December 2012
Nguyen V, Greenville AC, Dickman CR, Wardle GM (2015) On the validity of visual cover estimates for time series analyses: a case study of hummock grasslands. Plant Ecol 216:975–988
Nimmo DG et al (2012) Predicting the century-long post-fire responses of reptiles. Glob Ecol Biogeogr 21:1062–1073
Noy-Meir I (1973) Desert ecosystems: environment and producers. Annu Rev Ecol Syst 4:25–51
Pianka ER, Goodyear SE (2012) Lizard responses to wildfire in arid interior Australia: long-term experimental data and commonalities with other studies. Aust Ecol 37:1–11
Plummer M (2013) JAGS: a program for analysis of Bayesian graphical models using Gibbs sampling. version 4.1.0
Plummer M (2014) rjags: Bayesian graphical models using MCMC. R package version 3-13
Post E, Forchhammer MC (2002) Synchronization of animal population dynamics by large-scale climate. Nature 420:168–171
Purdie JL (1984) Land systems of the Simpson desert region., Natural resources series no. 2CSIRO Division of Water and Land Resources, Melbourne, Australia
R Core Team (2014) R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna
Ranta E, Kaitala V, Lindstrom J, Linden H (1995) Synchrony in population dynamics. Proc R Soc Lond B Biol Sci 262:113–118
Ranta E, Kaitala V, Lundberg P (2006) Ecology of populations. Cambridge University Press, Cambridge
Read JL, Kovac K-J, Brook BW, Fordham DA (2012) Booming during a bust: asynchronous population responses of arid zone lizards to climatic variables. Acta Oecol 40:51–61
Rodríguez D, Ojeda RA (2015) Scaling the relative dominance of exogenous drivers in structuring desert small mammal assemblages. Acta Oecol 69:173–181
Schlesinger CA, Christian KA, James CD, Morton SR (2011) Seven lizard species and a blind snake: activity, body condition and growth of desert herpetofauna in relation to rainfall. Aust J Zool 58:273–283
Shephard M (1992) The Simpson desert: natural history and human endeavour. Royal Geographical Society of Australasia, Adelaide
Smith AL, Michael Bull C, Driscoll DA (2013) Successional specialization in a reptile community cautions against widespread planned burning and complete fire suppression. J Appl Ecol 50:1178–1186
Su YS, Yajima M (2014) R2jags: a package for running jags from R. R package version 0.04-03
Van Etten EJB (2009) Inter-annual rainfall variability of arid Australia: greater than elsewhere? Aust Geogr 40:109–120
Ward EJ, Chirakkal H, González-Suárez M, Aurioles-Gamboa D, Holmes EE, Gerber L (2010) Inferring spatial structure from time-series data: using multivariate state-space models to detect metapopulation structure of California sea lions in the Gulf of California, Mexico. J Appl Ecol 47:47–56
Wardle GM, Greenville AC, Frank ASK, Tischler M, Emery NJ, Dickman CR (2015) Ecosystem risk assessment of Georgina gidgee woodlands in central Australia. Aust Ecol 40:444–459
Woodman JD, Ash JE, Rowell DM (2006) Population structure in a saproxylic funnelweb spider (Hexathelidae: Hadronyche) along a forested rainfall gradient. J Zool 268:325–333
Acknowledgments
We thank Bush Heritage Australia, H. Jukes, G. McDonald, D. Smith and G. Woods for allowing access to the properties in the study region, members of the Desert Ecology Research Group, especially B. Tamayo, D. Nelson and C.-L. Beh, and many volunteers for valuable assistance in the field. Funding was provided by the Australian Research Council and the Australian Government’s Terrestrial Ecosystems Research Network (www.tern.gov.au), an Australian research infrastructure facility established under the National Collaborative Research Infrastructure Strategy and Education Infrastructure Fund––Super Science Initiative through the Department of Industry, Innovation, Science, Research and Tertiary Education. ACG was supported by an Australian Postgraduate Award and CRD by an Australian Research Council Fellowship.
Author contribution statement
The study was designed by AG, with input from GW, CD and VN. AG and VN performed the analyses, and AG wrote the first draft of the manuscript. AG, GW and CD collected the data. GW, CD and VN contributed substantially to all revisions of the manuscript.
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Communicated by Jean-François Le Galliard.
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Greenville, A.C., Wardle, G.M., Nguyen, V. et al. Spatial and temporal synchrony in reptile population dynamics in variable environments. Oecologia 182, 475–485 (2016). https://doi.org/10.1007/s00442-016-3672-8
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DOI: https://doi.org/10.1007/s00442-016-3672-8