Evidence of sex segregation in Hector's dolphin (Cephalorhynchus hectori)

Aquatic Mammals

Volumn 35, Issue 2, 2009, Pages 212-219

  Webster, Trudi A ^a   Dawson, Stephen M ^a   Slooten, Elisabeth ^a  

^a UNIVERSITY OF OTAGO   (New Zealand)

Author keywords

Cephalorhynchus hectori; Group composition; Hector's dolphin; Sex segregation

Indexed keywords

DOLPHIN; POPULATION DECLINE; REPRODUCTION; SEX DETERMINATION;

AVES; CEPHALORHYNCHUS HECTORI; MAMMALIA; PISCES;

EID: 70350324600     PISSN: 01675427     EISSN: None     Source Type: Journal    
DOI: 10.1578/AM.35.2.2009.212     Document Type: Article

References (60)

1. Acevedo-Gutiérrez, A. (2002). Group behaviour. In W. F. Perrin, B. Würsig, & J. G. M. Thewissen (Eds.), Encyclopaedia of marine mammals (pp. 537-544). San Diego: Academic Press. 1,480 pp.
2. Allee, W. C. (1931). Animal aggregations: A study in general sociology. Chicago: University of Chicago Press. 431 pp.
3. Amano, M., & Kuramochi, T. (1992). Segregative migration of Dall's porpoise in the Sea of Japan and Sea of Okhotsk. Marine Mammal Science, 8(2), 143-151.
4. Baker, A. N., Smith, A. N. H., & Pichler, F. B. (2002). Geographical variation in Hector's dolphin: Recognition of new subspecies of Cephalorhynchus hectori. Journal of the Royal Society of New Zealand, 32, 713-727.
5. Bearzi, G. (2000). First report of a common dolphin death following the penetration of a biopsy dart. Journal of Cetacean Research and Management, 2(3), 217-221.
6. Bräger, S., Chong, A., Dawson, S., Slooten, E., & Würsig, B. (1999). A combined stereo-photogrammetry and underwater-video system to study group composition of dolphins. Helgoland Marine Research, 53, 122-128.
7. Bräger, S., Dawson, S. M, Slooten, E., Smith, S., Stone, G. S., & Yoshinaga, A. (2002). Site fidelity and along-shore range in Hector's dolphin, an endangered marine dolphin from New Zealand. Biological Conservation, 108, 281-287.
8. Breed, G. A., Bowen, W. D., McMillan, J. I., & Leonard, M. L. (2006). Sexual segregation of seasonal foraging habitats in a non-migratory marine mammal. Proceedings of the Royal Society B-Biological Sciences, 273(1599), 2319-2326.
9. Clarke, J., Manly, B., Kerry, K., Gardner, H., Franchi, E., Corsolini, S., et al. (1998). Sex differences in Adélie penguin foraging strategies. Polar Biology, 20, 248-258.
10. Connor, R. (2000). Group living in whales and dolphins. In J. Mann, R. Connor, P. L. Tyack, & H. Whitehead (Eds.), Cetacean societies: Field studies of whales and dolphins (pp. 199-218). Chicago: University of Chicago Press. 448 pp.
11. Conradt, L. (1998). Could asynchrony in activity between the sexes cause intersexual social segregation in ruminants? Proceedings of the Royal Society B-Biological Sciences, 265, 1359-1363.
12. Conradt, L. (1999). Social segregation is not a consequence of habitat segregation in red deer and feral soay sheep. Animal Behaviour, 57, 1151-1157.
13. Constantine, R., Brunton, D. H., & Todd, D. (2004). Dolphin watching tour boats change bottlenose dolphin (Tursiops truncatus) behaviour. Biological Conservation, 117, 299-307.
14. Croft, D. P., Morrell, L. J., Wade, A. S., Piyapong, C., Ioannou, C. C., Dyer, J. R. G., et al. (2006). Predation risk as a driving force for sexual segregation: A cross-population comparison. The American Naturalist, 167(6), 867-878.
15. Dawson, S. M., & Slooten, E. (1988). Studies on Hector's dolphin, Cephalorhynchus hectori: A progress report. Report of the International Whaling Commission, (Special Issue 9), 325-337.
16. Du Toit, J. T. (1995). Sexual segregation in kudu: Sex differences in competitive ability, predation risk or nutritional needs. South African Journal of Wildlife Research, 25(4), 127-132.
17. Fujiwara, M., & Caswell, H. (2001). Demography of the endangered North Atlantic right whale. Nature, 414, 537-541.
18. Gonzáles-Solís, J., Croxall, J. P., & Wood, A. G. (2000). Sexual dimorphism and sexual segregation in foraging strategies of northern giant petrels, Macronectes halli, during incubation. Oikos, 90, 390-398.
19. Gowans, S., Dalebout, M. L., Hooker, S. K., & Whitehead, H. (2000). Reliability of photographic and molecular techniques for sexing northern bottlenose whales (Hyperoodon ampullatus). Canadian Journal of Zoology, 78, 1224-1229.
20. Hall, A. J., McConnell, B. J., & Barker, R. J. (2001). Factors affecting first-year survival in grey seals and their implications for life history strategy. Journal of Ecology, 70, 138-149.
21. Harlin, A. D., Würsig, B., Baker, C. S., & Markowitz, T. M. (1999). Skin swabbing for genetic analysis: Application to dusky dolphins (Lagenorhynchus obscurus). Marine Mammal Science, 15(2), 409-425.
22. Kie, J. G. (1999). Optimal foraging and risk of predation: Effects on behaviour and social structure in ungulates. Journal of Mammalogy, 80(4), 1114-1129.
23. Lawrence, H. A., Millar, C. D., Taylor, G. A., Macdonald, L. D., & Lambert, D. M. (2008). Excess of unpaired males in one of the world's most endangered seabirds, the Chatham Island taiko Pterodroma magentae. Journal of Avian Biology, 39(3), 359-363.
24. Le Boeuf, B. J., Crocker, D. E., Costa, D. P., Blackwell, S. B., Webb, P. M., & Houser, D. S. (2000). Foraging ecology of northern elephant seals. Ecological monographs, 70(3), 353-382.
25. Loe, L. E., Irvine, R. J., Bonnefant, C., Stien, A., Langvatn, R., Albon, S. D., et al. (2006). Testing five hypotheses of sexual segregation in an arctic ungulate. Journal of Animal Ecology, 75(2), 483-496.
26. Loseto, L. L., Richard, P., Stern, G. A., Orr, J., & Ferguson, S. H. (2006). Segregation of Beaufort Sea beluga whales during the open water season. Canadian Journal of Zoology, 84, 1743-1751.
27. Lyrholm, T., Leimar, O., Johanneson, B., & Gyllensten, U. (1999). Sex-biased dispersal in sperm whales: Contrasting mitochondrial and nuclear genetic structure of global populations. Proceedings of the Royal Society B - Biological Sciences, 266(1417), 347-354.
28. Magliocca, F., Querouil, S., & Gautier-Hion, A. (1999). Population structure and group composition of western lowland gorillas in North-Western Republic of Congo. American Journal of Primatology, 48, 1-14.
29. Main, M. B., Weckerly, F. W., & Bleich, V. C. (1996). Sexual segregation in ungulates: New directions for research. Journal of Mammalogy, 77 (2), 449-461.
30. Martin, A. R., & da Silva, V. M. F. (2004). River dolphins and flooded forest: Seasonal habitat use and sexual segregation of botos (Inia geoffrensis) in an extreme cetacean environment. Journal of the Zoological Society (London), 263, 295-305.
31. Michaud, R. (2005). Sexual segregation in vertebrates. In K. Ruckstuhl & P. Neuhaus (Eds.), Sociality and ecology of the odontocetes (pp. 304-326). Cambridge, UK: Cambridge University Press. 500 pp.
32. Molnár, P. K., Derocher, A. E., Lewis, M. A., & Taylor, M. K. (2008). Modelling the mating system of polar bears: A mechanistic approach to the Allee effect. Proceedings of the Royal Society B-Biological Sciences, 275(1631), 217-226.
33. Mysterud, A. (2000). The relationship between ecological segregation and sexual body size dimorphism in large herbivores. Oecologia, 124, 40-54.
34. Neumann, D. R., Russell, K., Orams, M. B., Baker, C. S., & Duignan, P. (2002). Identifying sexually mature, male short-beaked common dolphins (Delphinus delphis) at sea, based on the presence of a postanal hump. Aquatic Mammals, 28(2), 181-187.
35. Parnell, R. J. (2002). Group size and structure in western lowland gorillas (Gorilla gorilla gorilla) at Mbeli Bai, Republic of Congo. American Journal of Primatology, 56, 193-206.
36. Pérez-Barberéa, F. J., Robertson, E., & Gordon, I. J. (2005). Are social factors sufficient to explain sexual segregation in ungulates? Animal Behaviour, 69, 827-834.
37. Phillips, R. A., Silk, J. R. D., Phalan, B., Catry, P., & Croxall, J. P. (2004). Seasonal sexual segregation in two Thassarche albatross species: Competitive exclusion, reproductive role specialisation or foraging niche divergence? Proceedings of the Royal Society B-Biological Sciences, 271, 1283-1291.
38. Pichler, F. B., Dawson, S. M., Slooten, E., & Baker, C. S. (1998). Geographic isolation of Hector's dolphin populations described by mitochondrial DNA sequences. Conservation Biology, 12(3), 676-682.
39. Rayment, W., Dawson, S. M., Slooten, L., & Childerhouse, S. (2006). Offshore distribution of Hector's dolphin at Banks Peninsula. (Department of Conservation, Research and Development Series 232). Wellington, New Zealand: Department of Conservation. 23 pp.
40. Rayment, W., Dawson, S. M., Slooten, E., Bräger, S., DuFresne, S., & Webster, T. (In press). Kernel density estimates of alongshore home-range of Hector's dolphins at Banks Peninsula, New Zealand. Marine Mammal Science.
41. Rice, D. W. (1989). Sperm whale Physeter macrocephalus Linnaeus, 1758. In S. H. Ridgway & R. J. Harrison (Eds.), Handbook of marine mammals. Vol. 4: River dolphins and the larger toothed whales (pp. 177-233). London: Academic Press. 442 pp.
42. Ruckstuhl, K. E., & Kokko, H. (2002). Modelling sexual segregation in ungulates: Effects of group size, activity budgets and synchrony. Animal Behaviour, 64, 909-914.
43. Ruckstuhl, K. E., & Neuhaus, P. (2000). Sexual segregation in ungulates: A new approach. Behaviour, 137, 361-377.
44. Shelton, D. E. (2006). Dusky dolphins in New Zealand: Group structure by sex and relatedness. Master of Science dissertation, Texas A&M University, Galveston. 82 pp.
45. Slooten, E. (1991). Age, growth and reproduction in Hector's dolphins. Canadian Journal of Zoology, 69, 1689-1700.
46. Slooten, E. (1994). Behaviour of Hector's dolphins: Classifying behaviour by sequence analysis. Journal of Mammalogy, 75(4), 956-964.
47. Slooten, E., & Dawson, S. M. (1994). Hector's dolphin Cephalorhynchus hectori (van Beneden, 1881). In S. H. Ridgway & R. J. Harrison (Eds.), Handbook of marine mammals. Vol. 5: Delphinidae and phocoenidae (pp. 311-333). New York: Academic Press. 416 pp.
48. Slooten, E., Fletcher, D., & Taylor, B. (2000). Accounting for uncertainty in risk assessment: Case study of Hector's dolphin mortality due to gillnet entanglement. Conservation Biology, 14(5), 1264-1270.
49. Smit, I. P. J., Grant, C. C., & Whyte, I. J. (2007). Landscape-scale sexual segregation in the dry season distribution and resource utilization of elephants in Kruger National Park, South Africa. Diversity and Distributions, 13(2), 225-236.
50. Smolker, R. A., Richards, A. F., Connor, R. C., & Pepper, J. W. (1992). Sex differences in patterns of association among Indian Ocean bottlenose dolphins. Behaviour, 123, 38-69.
51. Spitz, S. S., Herman, L. M., & Pack, A. A. (2000). Measuring sizes of humpback whales (Megaptera novaeangliae) by underwater videogrammetry. Marine Mammal Science, 16(3), 664-676.
52. Stevick, P. T., Allen, J., Bérubé, M., Clapham, P. J., Katona, S. K., Larsen, F., et al. (2003). Segregation of migration by feeding ground origin in North Atlantic hump-back whales (Megaptera novaeangliae). Journal of the Zoological Society (London), 259, 231-237.
53. Stewart, B. (1997). Ontogeny of differential migration and sexual segregation in northern elephant seals. Journal of Mammalogy, 78(4), 1101-1116.
54. Stone, G. S. (Comp.). (1992). Hector's dolphin research program 1990-92. Department of Conservation, New Zealand. Canterbury Conservancy Technical Report Series, 4, 1-56.
55. Weilgus, R. B., & Bunnell, F. L. (1994). Sexual segregation and female grizzly bear avoidance of males. The Journal of Wildlife Management, 58(3), 405-413.
56. Weilgus, R. B., & Bunnell, F. L. (1995). Tests of hypotheses for sexual segregation in grizzly bears. The Journal of Wildlife Management, 59(3), 552-560.
57. Whitehead, H. (2003). Sperm whales: Social evolution in the ocean. Chicago and London: University of Chicago Press. 431 pp.
58. Wittemyer, G., Douglas-Hamilton, I., & Getz, W. M. (2005). The socio-ecology of elephants: Analysis of the processes creating multi-tiered social structures. Animal Behaviour, 69, 1357-1371.
59. Wolf, J. B. W., Kauermann, G., & Trillmilch, F. (2005). Males in the shade: Habitat use and sexual segregation in the Galápagos sea lion (Zalophus californianus wollebaeki). Behavioral Ecology and Sociobiology, 59, 293-302.
60. Würsig, B., Duprey, N., & Weir, J. (2007). Dusky dolphins (Lagenorhynchus obscurus) in New Zealand waters: Present knowledge and research goals (Department of Conservation Research and Development Series 270). Wellington, New Zealand: Department of Conservation. 28 pp.