Abstract
An animal’s home range is driven by a range of factors including top-down (predation risk) and bottom-up (habitat quality) processes, which often vary in both space and time. We assessed the role of these processes in driving spatiotemporal patterns in the home range of the green turtle (Chelonia mydas), an important marine megaherbivore. We satellite tracked adult green turtles using Fastloc-GPS telemetry in the Chagos Archipelago and tracked their fine-scale movement in different foraging areas in the Indian Ocean. Using this extensive data set (5081 locations over 1675 tracking days for 8 individuals), we showed that green turtles exhibit both diel and seasonal patterns in activity and home range size. At night, turtles had smaller home ranges and lower activity levels, suggesting they were resting. In the daytime, home ranges were larger and activity levels higher, indicating that turtles were actively feeding. The transit distance between diurnal and nocturnal sites varied considerably between individuals. Further, some turtles changed resting and foraging sites seasonally. These structured movements indicate that turtles had a good understanding of their foraging grounds in regard to suitable areas for foraging and sheltered areas for resting. The clear diel patterns and the restricted size of nocturnal sites could be caused by spatiotemporal variations in predation risk, although other factors (e.g. depth, tides and currents) could also be important. The diurnal and seasonal pattern in home range sizes could similarly be driven by spatiotemporal variations in habitat (e.g. seagrass or algae) quality, although this could not be confirmed.
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References
Aragones L, Marsh H (2000) Impact of dugong grazing and turtle cropping on tropical seagrass communities. Pac Conserv Biol 5:277–288
Aragones LV, Lawler IR, Foley WJ, Marsh H (2006) Dugong grazing and turtle cropping: grazing optimization in tropical seagrass systems? Oecologia 149:635–647
Atwood TB, Connolly RM, Ritchie EG et al (2015) Predators help protect carbon stocks in blue carbon ecosystems. Nat Clim Change 5:1038–1045
Bailey D, Gross J, Laca E et al (1996) Mechanisms that result in large herbivore grazing distribution patterns. J Range Manage 49:386–400
Ballorain K, Ciccione S, Bourjea J et al (2010) Habitat use of a multispecific seagrass meadow by green turtles Chelonia mydas at Mayotte Island. Mar Biol 157:2581–2590
Barry D, Hartigan JA (1993) A Bayesian analysis for change point problems. J Am Stat Assoc 88:309–319
Bjorndal KA (1980) Nutrition and grazing behavior of the green turtle Chelonia mydas. Mar Biol 56:147–154
Börger L, Dalziel BD, Fryxell JM (2008) Are there general mechanisms of animal home range behaviour? A review and prospects for future research. Ecol Lett 11:637–650
Boyce MS, McDonald LL (1999) Relating populations to habitats using resource selection functions. Trends Ecol Evol 14:268–272
Brooks LB, Harvey JT, Nichols WJ (2009) Tidal movements of East Pacific green turtle Chelonia mydas at a foraging area in Baja California Sur, Mexico. Mar Ecol Prog Ser 386:263–274
Brown JS (1988) Patch use as an indication of habitat preference, predation risk, and competition. Behav Ecol Sociobiol 22:37–47
Brown JS (1999) Vigilance, patch use and habitat selection: foraging under predation risk. Evol Ecol Res 1:49–71
Brown JS, Kotler BP (2004) Hazardous duty pay and the foraging cost of predation. Ecol Lett 7:999–1014
Cederlund G, Sand H (1994) Home-range size in relation to age and sex in moose. J Mammal 75:1005–1012
Charnov EL (1976) Optimal foraging, the marginal value theorem. Theor Popul Biol 9:129–136
Christiansen F, Lusseau D (2015) Linking behavior to vital rates to measure the effects of non-lethal disturbance on wildlife. Conserv Lett 8:424–431
Cowlishaw G (1997) Trade-offs between foraging and predation risk determine habitat use in a desert baboon population. Anim Behav 53:667–686
Creel S, Winnie J, Maxwell B et al (2005) Elk alter habitat selection as an antipredator response to wolves. Ecology 86:3387–3397
Dujon AM, Lindstrom RT, Hays GC (2014) The accuracy of Fastloc-GPS locations and implications for animal tracking. Methods Ecol Evol 5:1162–1169
Erdman C, Emerson JW (2007) bcp: an R package for performing a Bayesian analysis of change point problems. J Stat Softw 23:1–13
Festa-Bianchet M (1988) Seasonal range selection in bighorn sheep: conflicts between forage quality, forage quantity, and predator avoidance. Oecologia 75:580–586
Forester JD, Ives AR, Turner MG et al (2007) State-space models link elk movement patterns to landscape characteristics in Yellowstone National Park. Ecol Monogr 77:285–299
Fretwell SD, Lucas HL (1970) On territorial behaviour and other factors influencing habitat distribution in birds. I. Theoretical development. Acta Biol 19:16–36
Fryxell JM (1991) Forage quality and aggregation by large herbivores. Am Nat 138:478–498
Fryxell JM, Wilmshurst JF, Sinclair ARE (2004) Predictive models of movement by serengeti grazers. Ecology 85:2429–2435
Fryxell JM, Hazell M, Börger L et al (2008) Multiple movement modes by large herbivores at multiple spatiotemporal scales. PNAS 105:19114–19119
Godley BJ, Richardson S, Broderick AC et al (2002) Long-term satellite telemetry of the movements and habitat utilisation by green turtles in the Mediterranean. Ecography 25:352–362
Gredzens C, Marsh H, Fuentes MMPB et al (2014) Satellite tracking of sympatric marine megafauna can inform the biological basis for species co-management. PLoS ONE 9:e98944
Hays GC, Luschi P, Papi F et al (1999) Changes in behaviour during the internesting period and postnesting migration for Ascension Island green turtles. Mar Ecol Prog Ser 189:263–273
Hays GC, Adams CR, Broderick AC et al (2000) The diving behaviour of green turtles at Ascension Island. Anim Behav 59:577–586
Hays GC, Mortimer JA, Ierodiaconou D, Esteban N (2014) Use of long-distance migration patterns of an endangered species to inform conservation planning for the world’s largest marine protected area. Conserv Biol 28:1636–1644
Hays GC, Ferreira LC, Sequeira AMM et al (2016) Key questions in marine megafauna movement ecology. Trends Ecol Evol 31:463–475
Hazel J (2009) Evaluation of fast-acquisition GPS in stationary tests and fine-scale tracking of green turtles. J Exp Mar Bio Ecol 374:58–68
Hazel J, Lawler IR, Hamann M (2009) Diving at the shallow end: green turtle behaviour in near-shore foraging habitat. J Exp Mar Bio Ecol 371:84–92
Heithaus MR, Dill LM (2002) Food availability and tiger shark predation risk influence bottlenose dolphin habitat use. Ecology 83:480–491
Heithaus MR, Dill LM (2006) Does tiger shark predation risk influence foraging habitat use by bottlenose dolphins at multiple spatial scales? Oikos 114:257–264
Heithaus MR, Frid A, Dill LM (2002) Shark-inflicted injury frequencies, escape ability, and habitat use of green and loggerhead turtles. Mar Biol 140:229–236
Heithaus MR, Frid A, Wirsing AJ et al (2007) State-dependent risk-taking by green sea turtles mediates top-down effects of tiger shark intimidation in a marine ecosystem. J Anim Ecol 76:837–844
Hobbs NT (1996) Modification of ecosystems by ungulates. J Wildl Manage 60:695–713
Hopcraft JGC, Morales JM, Beyer HL et al (2014) Competition, predation, and migration: individual choice patterns of Serengeti migrants captured by hierarchical models. Ecol Monogr 84:355–372
Houston AI, McNamara JM, Hutchinson JMC (1993) General results concerning the trade-off between gaining energy and avoiding predation. Philos Trans R Soc B 341:375–397
Humphries NE, Queiroz N, Dyer JR et al (2010) Environmental context explains Lévy and Brownian movement patterns of marine predators. Nature 465:1066–1069
Illius AW, Fitzgibbon C (1994) Costs of vigilance in foraging ungulates. Anim Behav 47:481–484
Kittle AM, Fryxell JM, Desy GE, Hamr J (2008) The scale-dependent impact of wolf predation risk on resource selection by three sympatric ungulates. Oecologia 157:163–175
Langvatn R, Hanley TA (1993) Feeding-patch choice by red deer in relation to foraging efficiency. Oecologia 95:164–170
Laundré JW, Hernandez L, Altendorf KB (2001) Wolves, elk, and bison: reestablishing the “landscape of fear” in Yellowstone National Park, USA. Can J Zool 79:1401–1409
Lima SL (2002) Putting predators back into predator-prey behavioral interactions. Trends Ecol Evol 17:70–75
Lima SL, Dill LM (1990) Behavioral decisions made under the risk of predation: a review and prospectus. Can J Zool 68:619–640
Limpus CJ, Limpus DJ (2000) Mangroves in the diet of Chelonia mydas in Queensland, Australia. Mar Turt Newsl 89:13–15
MacDonald BD, Madrak SV, Lewison RL et al (2013) Fine scale diel movement of the east Pacific green turtle, Chelonia mydas, in a highly urbanized foraging environment. J Exp Mar Bio Ecol 443:56–64
Makowski C, Seminoff JA, Salmon M (2006) Home range and habitat use of juvenile Atlantic green turtles (Chelonia mydas L.) on shallow reef habitats in Palm Beach, Florida, USA. Mar Biol 148:1167–1179
McLoughlin PD, Ferguson SH (2000) A hierarchical pattern of limiting factors helps explain variation in home range size. Écoscience 7:123–130
McNaughton SJ, Banyikwa FF, McNaughton MM (1997) Promotion of the cycling of diet-enhancing nutrients by African grazers. Science 278:1798–1800
Mech LD (1977) Productivity, mortality, and population trends of wolves in northeastern Minnesota. J Mammal 58:559–574
Minamikawa S, Naito Y, Sato K et al (2000) Maintenance of neutral buoyancy by depth selection in the loggerhead turtle Caretta caretta. J Exp Biol 203:2967–2975
New LF, Clark JS, Costa DP et al (2014) Using short-term measures of behaviour to estimate long-term fitness of southern elephant seals. Mar Ecol Prog Ser 496:99–108
R Core Team (2014) R: a language and environment for statistical computing. http://www.rproject.org/
Rasheed MA (1999) Recovery of experimentally created gaps within a tropical Zostera capricorni (Aschers.) seagrass meadow, Queensland Australia. J Exp Mar Bio Ecol 235:183–200
Rasheed MA, McKenna SA, Carter AB, Coles RG (2014) Contrasting recovery of shallow and deep water seagrass communities following climate associated losses in tropical north Queensland, Australia. Mar Pollut Bull 83:491–499
Riginos C, Grace JB (2008) Savanna tree density, herbivores, and the herbaceous community: bottom-up vs. top-down effects. Ecology 89:2228–2238
Ritchie ME, Tilman D, Knops JMH (1998) Herbivore effects on plant and nitrogen dynamics in Oak savanna. Ecology 79:165–177
Robbins BD, Bell SS (2000) Dynamics of a subtidal seagrass landscape: seasonal and annual change in relation to water depth. Ecology 81:1193–1205
Seminoff JA, Jones TT (2006) Diel movements and activity ranges of Green turtle (Chelonia mydas) at a temperate foraging area in the Gulf of California, Mexico. Herpetol Conserv Biol 1:81–86
Seminoff JA, Resendiz A, Nichols WJ (2002) Home range of green turtles Chelonia mydas at a coastal foraging area in the Gulf of California, Mexico. Mar Ecol Prog Ser 242:253–265
Senko J, Koch V, Megill WM et al (2010) Fine scale daily movements and habitat use of East Pacific green turtles at a shallow coastal lagoon in Baja California Sur, Mexico. J Exp Mar Bio Ecol 391:92–100
Sheppard JK, Jones RE, Marsh H, Lawler IR (2009) Effects of tidal and diel cycles on dugong habitat use. J Wildl Manage 73:45–59
Sih A (1980) Optimal behavior: can foragers balance two conflicting demands? Science 210:1041–1043
Sims DW, Southall EJ, Humphries NE et al (2008) Scaling laws of marine predator search behaviour. Nature 451:1098–1102
Sprogis KR, Raudino HC, Rankin R et al (2016) Home range size of adult Indo-Pacific bottlenose dolphins (Tursiops aduncus) in a coastal and estuarine system is habitat and sex-specific. Mar Mammal Sci 32:287–308
Storch I (1993) Habitat selection by capercaillie in summer and autumn: is bilberry important? Oecologia 95:257–265
Taquet C, Taquet M, Dempster T et al (2006) Foraging of the green sea turtle Chelonia mydas on seagrass beds at Mayotte Island (Indian Ocean), determined by acoustic transmitters. Mar Ecol Prog Ser 306:295–302
Tyne JA, Johnston DW, Rankin R et al (2015) The importance of spinner dolphin (Stenella longirostris) resting habitat: implications for management. J Appl Ecol 52:621–630
Valeix M, Loveridge AJ, Chamaille-Jammes S et al (2009) Behavioral adjustments of African herbivores to predation risk by lions: spatiotemporal variations influence habitat use. Ecology 90:23–30
Van Beest FM, Rivrud IM, Loe LE et al (2011) What determines variation in home range size across spatiotemporal scales in a large browsing herbivore? J Anim Ecol 80:771–785
Wallis de Vries MF, Laca EA, Demment MW (1999) The importance of scale of patchiness for selectivity in grazing herbivores. Oecologia 121:355–363
Wang M, Grimm V (2007) Home range dynamics and population regulation: an individual-based model of the common shrew Sorex ayaneus. Ecol Modell 205:397–409
Watanabe YY, Sato K, Watanuki Y et al (2011) Scaling of swim speed in breath-hold divers. J Anim Ecol 80:57–68
Wirsing AJ, Heithaus MR, Dill LM (2007) Living on the edge: dugongs prefer to forage in microhabitats that allow escape from rather than avoidance of predators. Anim Behav 74:93–101
Worton BJ (2002) Kernel methods for estimating the utilization distribution in home-range studies. Ecology 83:3257–3265
Zieman JC, Iverson RL, Ogden JC (1984) Herbivory effects on Thalassia testudinum leaf growth and nitrogen content. Mar Ecol Prog Ser 15:151–158
Acknowledgements
We thank British Forces BIOT, MRAG Ltd, NAVFACFE PWD DG Environmental Department, and the many volunteers on Diego Garcia for logistical support. We thank L. Avens and two anonymous reviewers for their constructive comments which helped to improve this manuscript. FC and GCH developed the study, as part of a larger project initially conceived by GCH, NE and JAM. FC led the data processing, analyses and interpretation of the data, with contribution from GCH and AMD. FC led the writing with input from GCH. All other authors commented on the manuscript.
Funding
This project was funded by a Darwin Initiative Challenge Fund grant (EIDCF008), the Department of the Environment Food and Rural Affairs (DEFRA), the Foreign and Commonwealth Office (FCO), College of Science of Swansea University, and the BIOT Scientific Advisory Group (SAG) of the FCO.
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All applicable international, national and/or institutional guidelines for the care and use of animals were followed. This article does not contain any studies with human participants performed by any of the authors.
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Christiansen, F., Esteban, N., Mortimer, J.A. et al. Diel and seasonal patterns in activity and home range size of green turtles on their foraging grounds revealed by extended Fastloc-GPS tracking. Mar Biol 164, 10 (2017). https://doi.org/10.1007/s00227-016-3048-y
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DOI: https://doi.org/10.1007/s00227-016-3048-y