Abstract
Because behavioral variation within and among populations may result from ecological, social, genetic and phenotypic differences, identifying the mechanism(s) responsible is challenging. Observational studies typically examine social learning by excluding ecological and genetic factors, but this approach is insufficient for many complex behaviors associated with substantial environmental variation. Indian Ocean bottlenose dolphins (Tursiops sp.) in Shark Bay, Western Australia show individual differences in foraging tactics, including possible tool use with marine sponges and social learning may be responsible for this diversity. However, the contributions of ecological factors to the development of these foraging tactics were not previously investigated. Here, we determined the relationship between ecological variables and foraging tactics and assessed whether differences in habitat use could explain individual differences in foraging tactics. We monitored 14 survey zones to identify how foraging tactics were spatially distributed and matched behavioral data to the ecological variables within each zone. Three of four foraging tactics were significantly correlated with ecological characteristics such as seagrass biomass, water depth, presence of marine sponges and season. Further, individual differences in habitat use were associated with some tactics. However, several tactics overlapped spatially and previous findings suggest demographic and social factors also contribute to the individual variation in this population. This study illustrates the importance of environmental heterogeneity in shaping foraging diversity and shows that investigating social learning by ruling out alternative mechanisms may often be too simplistic, highlighting the need for methods incorporating the relative contributions of multiple factors.
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References
Aisner R, Terkel J (1992) Ontogeny of pine cone opening behaviour in the black rat, Rattus rattus. Anim Behav 44:327–336
Baird RW (2000) The killer whale: foraging specializations and group hunting. In: Mann J, Connor RC, Tyack PL, Whitehead H (eds) Cetacean societies: field studies of dolphins and whales. University of Chicago Press, Chicago, IL, pp 127–153
Baird RW, Dill LM (1995) Occurrence and behaviour of transient killer whales: seasonal and pod-specific variability, foraging behaviour and prey handling. Can J Zool 73:1300–1311
Ballance LT (1992) Habitat use patterns and ranges of the bottlenose dolphin in the Gulf of California, Mexico. Mar Mamm Sci 8:262–274
Beck BB (1980) Animal tool behavior: use and manufacture of tools by animals. Garland STPM Press, New York, p 307
Bel’kovich VM (1991) Herd structure, hunting, and play: bottlenose dolphins in the Black Sea. In: Pryor K, Norris KS (eds) Dolphin societies: discoveries and puzzles. University of California Press, Berkeley, CA, pp 17–77
Benoit-Bird KJ, Würsig B, McFadden CJ (2004) Dusky dolphin (Lagenorhynchus obscurus) foraging in two different habitats: active acoustic detection of dolphins and their prey. Mar Mamm Sci 20:215–231
Boesch C, Marchesi P, Marchesi N, Fruth B, Joulian F (1994) Is nut cracking in wild chimpanzees a cultural behaviour? J Hum Evol 26:325–338
Chilvers BL, Corkeron PJ (2001) Trawling and bottlenose dolphins’ social structure. Proc R Soc Lond B 268:1901–1905
Connor RC, Heithaus MR, Berggren P, Miksis JL (2000) “Kerplunking”: surface fluke-splashes during shallow water bottom foraging by bottlenose dolphins. Mar Mamm Sci 16:646–653
Fragaszy DM, Perry S (eds) (2003a) The biology of traditions: models and evidence. Cambridge University Press, Cambridge, UK, p 456
Fragaszy DM, Perry S (2003b) Towards a biology of traditions. In: Fragaszy DM, Perry S (eds) The biology of traditions: models and evidence. Cambridge University Press, Cambridge, UK, pp 1–32
Galef BG Jr (2003) “Traditional” foraging behaviors of brown and black rats (Rattus norvegicus and Rattus rattus). In: Fragaszy DM, Perry S (eds) The biology of traditions: models and evidence. Cambridge University Press, Cambridge, UK, pp 159–186
Galef BG Jr (2004) Approaches to the study of traditional behaviors of free-living animals. Learn Behav 32:53–61
Gazda SK, Connor RC, Edgar RK, Cox F (2005) A division of labour with role specialization in group-hunting bottlenose dolphins (Tursiops truncatus) off Cedar Key, Florida. Proc R Soc Lond B Biol Sci 272:135–140
Guinet C (1991) Intentional stranding apprenticeship and social play in killer whales (Orcinus orca). Can J Zool 69:2712–2716
Hastie GD, Wilson B, Wilson LJ, Parsons KM, Thompson PM (2004) Functional mechanisms underlying cetacean distribution patterns: hotspots for bottlenose dolphins are linked to foraging. Marine Biology 144:397–403
Heithaus MR (2001) The biology of tiger sharks, Galeocerdo cuvier, in Shark Bay, Western Australia: sex ratio, size distribution, diet, and seasonal changes in catch rates. Environ Biol Fishes 61:25–36
Heithaus MR (2004) Fish communities of subtropical seagrass meadows and associated habitats in Shark Bay, Western Australia. Bull Mar Sci 75:79–99
Heithaus MR (2005) Habitat use and group size of pied cormorants (Phalacrocorax varius) in a seagrass ecosystem: possible effects of food abundance and predation risk. Marine Biology 147:27–35
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
Heyes CM (1994) Social learning in animals: categories and mechanisms. Biol Rev 69:207–231
Heyes CM, Galef BG Jr (eds) (1996) Social learning in animals: the roots of culture. Academic, San Diego, CA, p 411
Hoelzel AR (1991) Killer whale predation on marine mammals at Punta Norte, Argentina: food sharing, provisioning and foraging strategy. Behav Ecol Sociobiol 29:197–204
Hoelzel AR, Dorsey EM, Stern SJ (1989) The foraging specializations of individual minke whales. Anim Behav 38:786–794
Humle T, Matsuzawa T (2002) Ant-dipping among the chimpanzees of Bossou, Guinea, and some comparisons with other sites. Am J Primatol 58:133–148
Hunt GR, Gray RD (2003) Diversification and cumulative evolution in New Caledonian crow tool manufacture. Proc R Soc Lond B Biol Sci 270:867–874
Krützen M, Sherwin WB, Connor RC, Barre LM, Van de Casteele T, Mann J, Brooks R (2003) Contrasting relatedness patterns in bottlenose dolphins (Tursiops sp.) with different alliance strategies. Proc R Soc Lond B Biol Sci 270:497–502
Krützen M, Mann J, Heithaus MR, Connor RC, Bejder L, Sherwin WB (2005) Cultural transmission of tool use in bottlenose dolphins. Proc Natl Acad Sci USA 102:8939–8943
Laland KN, Hoppitt W (2003) Do animals have culture? Evol Anthropol 12:150–159
Laland KN, Williams K (1997) Shoaling generates social learning of foraging information in guppies. Anim Behav 53:1161–1169
Leatherwood S (1975) Some observations of feeding behavior of bottle-nosed dolphins (Tursiops truncatus) in the Northern Gulf of Mexico and (Tursiops cf T. gilli) off Southern California, Baja California, and Nayarit, Mexico. Mar Fish Rev 37:10–16
Mann J, Sargeant B (2003) Like mother, like calf: the ontogeny of foraging traditions in wild Indian Ocean bottlenose dolphins (Tursiops sp.). In: Fragaszy DM, Perry S (eds) The biology of traditions: models and evidence. Cambridge University Press, Cambridge, UK, pp 236–266
Mann J, Smuts B (1999) Behavioral development in wild bottlenose dolphin newborns (Tursiops sp.). Behaviour 136:529–566
McGrew WC, Ham RM, White LJT, Tutin CEG, Fernandez M (1997) Why don’t chimpanzees in Gabon crack nuts? Int J Primatol 18:353–374
Meyers LS, Gamst G, Guarino AJ (2006) Applied multivariate research: design and interpretation. Sage, Thousand Oaks, CA, USA
Nowacek DP (2002) Sequential foraging behaviour of bottlenose dolphins, Tursiops truncatus, in Sarasota Bay, FL. Behaviour 139:1125–1145
Palameta B, Lefebvre L (1985) The social transmission of a food-finding technique in pigeons: what is learned? Anim Behav 33:892–896
Partridge L, Green P (1985) Intraspecific feeding specializations and population dynamics. In: Sibly RM, Smith RH (eds) Behavioural ecology: ecological consequences of adaptive behaviour. Blackwell Scientific, Oxford, pp 207–226
Reader SM, Kendal JR, Laland KN (2003) Social learning of foraging sites and escape routes in wild Trinidadian guppies. Anim Behav 66:729–739
Rendell L, Whitehead H (2001) Culture in whales and dolphins. Behav Brain Sci 24:309–382
Rossbach KA, Herzing DL (1997) Underwater observations of benthic-feeding bottlenose dolphins (Tursiops truncatus) near Grand Bahama Island, Bahamas. Mar Mamm Sci 13:498–504
Sanz C, Morgan D, Gulick S (2004) New insights into chimpanzees, tools, and termites from the Congo Basin. Am Nat 164:567–581
Smolker RA, Richards AF, Connor RC, Pepper JW (1992) Sex differences in patterns of association among Indian Ocean bottlenose dolphins. Behaviour 123:38–69
Smolker R, Richards A, Connor R, Mann J, Berggren P (1997) Sponge carrying by dolphins (Delphinidae, Tursiops sp.): a foraging specialization involving tool use? Ethology 103:454–465
van Schaik CP, Knott CD (2001) Geographic variation in tool use on Neesia fruits in orang-utans. Am J Phys Anthropol 114:331–342
van Schaik CP, Ancrenaz M, Borgen G, Galdikas B, Knott CD, Singleton I, Suzuki A, Utami SS, Merrill M (2003a) Orangutan cultures and the evolution of material culture. Science 299:27–28
van Schaik CP, Fox EA, Fechtman LT (2003b) Individual variation in the rate of use of tree-hole tools among wild orang-utans: implications for hominin evolution. J Hum Evol 44:11–23
Watson-Capps JJ (2005) Female mating behavior in the context of sexual coercion and female ranging behavior of bottlenose dolphins (Tursiops sp.) in Shark Bay, Western Australia. Ph.D. Dissertation, Department of Biology, Georgetown University, Washington, DC, USA
Whitehead H, Rendell L (2004) Movements, habitat use and feeding success of cultural clans of South Pacific sperm whales. J Anim Ecol 73:190–196
Whiten A, Goodall J, McGrew WC, Nishida T, Reynolds V, Sugiyama Y, Tutin CEG, Wrangham RW, Boesch CB (1999) Cultures in chimpanzees. Nature 399:682–685
Würsig B, Würsig M (1977) The photographic determination of group size, composition, and stability of coastal porpoises (Tursiops truncatus). Science 198:755–756
Acknowledgements
We thank our colleagues from the Shark Bay Dolphin Research Project for their contributions to the long-term database, the Western Australia Department of Conservation and Land Management for providing logistical support and the Western Australia Department for Planning and Infrastructure for providing tidal data. The Monkey Mia Dolphin Resort and Magellan also contributed generous support during data collection. We thank L. Douglass for valuable statistical advice and R. Barr, L. Dill and anonymous reviewers for helpful suggestions. Special thanks to A. Hough, R. Lam, R. Abernethy, V. Alla, L. Barre, F. Bretos, S. Buchannan, J. Burghardt, M. Davis, H. Finn, C. Genrich, P. Greene, K. Harper, J. Laski, K. Martin, J. McLash, R. McPhie, B. Stalvie, and K. Wirsing for assistance with data collection and to J. Watson-Capps for providing the bathymetry map for the study area. Funding was provided by the Dolphins of Monkey Mia Research Foundation, the Eppley Foundation for Research (JM), Florida International University (MRH), Georgetown University (BLS, JM), the Helen V. Brach Foundation (JM), Honda Motors (BLS, JM), the Lerner-Gray Award (American Museum of Natural History) (MRH), Magellan (BLS, JM), Mercury Marine (AJW, MRH), Monkey Mia Wildsights (AJW), the National Geographic Society Expeditions Council grants (EC0151-03, EC26-98) (AJW, MRH), the National Science Foundation Graduate Research Fellowship (BLS, MRH), the National Science Foundation grant 9753044 (JM), NSERC Canada grant A6869 (L.M. Dill, AJW, MRH), the PADI Foundation (AJW, MRH) and the Shane Award (Society for Marine Mammalogy) (MRH). This research was conducted under permits from the Western Australia Department of Conservation and Land Management and the Georgetown University Animal Care and Use Committee.
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Sargeant, B.L., Wirsing, A.J., Heithaus, M.R. et al. Can environmental heterogeneity explain individual foraging variation in wild bottlenose dolphins (Tursiops sp.)?. Behav Ecol Sociobiol 61, 679–688 (2007). https://doi.org/10.1007/s00265-006-0296-8
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DOI: https://doi.org/10.1007/s00265-006-0296-8