Environmental Biology of Fishes

, Volume 93, Issue 4, pp 557–575 | Cite as

Population estimates of Alfred mantas (Manta alfredi) in central Maldives atolls: North Male, Ari and Baa

  • Anne-Marie Kitchen-Wheeler
  • Csilla Ari
  • Alasdair J. Edwards
Article

Abstract

The Alfred manta, Manta alfredi, is economically important in the Maldives due to the large number of tourists attracted to SCUBA dive and snorkel with them. It is important to understand the size of populations around main diving points and throughout the Maldives so that manta based tourism activities can be developed more successfully and the impact of tourism can be monitored. Using natural markings to identify individual manta rays, Petersen and Jolly-Seber probabilistic estimators were used to assess population size for main dive sites and the central atolls of North Male, Ari and Baa. Between 2000 and 2009, 1835 individual mantas were identified from 3373 sightings. There was a significant gender bias with a male: female ratio of 1:1.8. Only 24.7% of manta rays were re-sighted between 1 and 34 times with a maximum gap of 7 years and 11 months between sightings. Estimates for populations around main dive sites were 181–562. The estimated population of M. alfredi for North Male atoll is 537 (SE ± 53.2). Estimated atoll populations were extrapolated to obtain an estimate of Manta alfredi population for the entire Maldives of 9,677 individuals.

Keywords

Mobulinae Sight-resight Visual identification Photo ID Eco-tourism Dive industry 

Notes

Acknowledgements

This research was conducted as part of a research program at Newcastle University, UK. We thank Douglas David Seifert who sponsored the research at Hanifaru in 2009, Rob Bryning of Maldives Scuba Tours who has been fully supportive of our manta ray research, Matt Kitchen, Nick and Demelza Masters, Lisa Allison, Shaff Naeem, Guy Stevens and the many volunteer divers who assisted with data collection and donated photographs from 2006 to 2008. We would like to express our thanks to the reviewers of this paper for their thoughtful comments.

References

  1. Alava M, Dolumbalo´ E, Yaptinchay A, Trono R (2002) Fishery and trade of whale sharks and manta rays in the Bohol Sea, Philippines. Elasmobranch biodiversity, conservation and management: proceedings of the international seminar and workshop, Sabah, Malaysia, July 1997. Occasional paper of the IUCN Species Survival Commission 25 132–148Google Scholar
  2. Anderson RC (1998) Sharks mean business. Scientific American Presents 9(3):72–73Google Scholar
  3. Anderson RC (2005) Reef fish of the maldives. Manta Marine Pvt, MaleGoogle Scholar
  4. Anderson SD, Pyle P (2003) A temporal, sex-specific occurrence pattern amongst white sharks in the south Farallon Islands, California. Calif Fish Game 89:96–101Google Scholar
  5. Anderson RC, Adam MS, Goes J (2011) From monsoons to mantas: seasonal distribution of Manta alfredi in the Maldives. Fish Oceanogr 20:104–113CrossRefGoogle Scholar
  6. Anderson RC, Adam MS, Kitchen-Wheeler A-M, Stevens G (2010) Extent and economic value of manta ray watching in the Maldives. Tour Mar Environ 7:15–27CrossRefGoogle Scholar
  7. Bailey NTJ (1951) On estimating the size of mobile population from capture-recapture data. Biometrika 38:293–306Google Scholar
  8. Bigelow HB, Schroeder WC (1953) Sawfishes, guitarfishes, skates and rays. In: Bigelow HB, Schroeder WC (eds) Fishes of the Western North Atlantic, Part 2. Sears foundation. Marine research. Yale University, New Haven, pp 508–514Google Scholar
  9. Blackmer AL, Anderson SK, Weinrich MT (2000) Oman's Humpback whales (Megaptera novaeangliae). J Oman Stud 11:11–18Google Scholar
  10. Buckland ST (1990) Estimation of survival rates from sightings of individually identifiable whales. Rep Int Whal Comm Special Issue 12:149–153Google Scholar
  11. Castro ALF, Rosa RS (2005) Use of natural marks on population estimates of the nurse shark, Ginglymostoma cirratum, at Atol das Rocas Biological Reserve, Brazil. Environ Biol Fishes 72:213–221CrossRefGoogle Scholar
  12. Cliff G, Van der Elst RP, Govender A, Witthuhn TK, Bullen EM (1996) First estimates of mortality and population size of white shark on the South African coast. In: Klimley AP, Ainley DG (eds) Great white sharks the biology of Carcharodon carcharias. Academic, San Diego, pp 393–400CrossRefGoogle Scholar
  13. Compagno L, Last P (1999) Mobulidae: devil rays. In: Carpenter K, Niem V (eds) FAO species identification guide for fishery purposes The living marine resources of the Western Central Pacific Vol 3 Batoid fishes, chimaeras and bony fishes part 1 (Elopidae to Linophrynidae). FAO, Rome, pp 1397–2068Google Scholar
  14. Compagno LJV (1999) Checklist for living elasmobranchs. In: Hamlett WC (ed) Sharks, skates and rays: the biology of elasmobranch fishes. John Hopkins University Press, Baltimore, pp 471–498Google Scholar
  15. Compagno LJV, Ebert DA, Smale MJ (1989) Guide to the sharks and rays of Southern Africa. New Holland, LondonGoogle Scholar
  16. Cormack RM (1964) Models for capture-recapture. Biometrika 51:429–438Google Scholar
  17. Cormack RM (1968) The statistics of capture-recapture methods. Oceanogr Mar Biol Annu Rev 6Google Scholar
  18. Cormack RM (1979) Models for capture-recapture. Stat Ecol Ser 5:217–255Google Scholar
  19. Davis D, Banks S, Birtles A, Valentine P, Cuthill M (1997) Whale sharks in Ningaloo marine park: managing tourism in an Australian marine protected area. Tour Manag 18:259–271CrossRefGoogle Scholar
  20. Deakos MH, Baker JD, Bejder L (2011) Characteristics of a manta ray Manta alfredi population off Maui. Hawaii, and implications for management. Marine Ecol-Prog Ser 429:234–260Google Scholar
  21. Dewar H, Mous P, Domeier M, Muljadi A, Pet J, Whitty J (2008) Movements and site fidelity of the giant manta ray, Manta birostris, in the Komodo Marine Park, Indonesia. Mar Biol 155:121–133CrossRefGoogle Scholar
  22. Dudgeon CL, Noad MJ, Lanyon JM (2008) Abundance and demography of a seasonal aggregation of zebra sharks Stegostoma fasciatum. Mar Ecol Prog Ser 368:269–281CrossRefGoogle Scholar
  23. Feder HM (1966) Cleaning symbiosis in the marine environment. In: Henery M (ed) symbiosis. Academic, New York, pp 327–390Google Scholar
  24. Gatz AJ, Loar JM (1988) Petersen and removal population size estimates: combining methods to adjust and interpret results when assumptions are violated. Environ Biol Fishes 21:293–307CrossRefGoogle Scholar
  25. Gooding RM (1964) Observations of fish from a floating observation raft at sea. Proc Hawaiian Acad Sci 39:27Google Scholar
  26. Graham RT, Roberts CM (2007) Assessing the size, growth rate and structure of a seasonal population of whale sharks (Rhincodon typus Smith 1828) using conventional tagging and photo identification. Fish Res 84:71–80CrossRefGoogle Scholar
  27. Guttridge TL, Gruber S, Gledhill KS, Croft DP, Sims DW, Krause J (2009) Social preferences of juvenile lemon sharks Negaprion brevirostris. Anim Behav 78:543–548CrossRefGoogle Scholar
  28. Hoening JM, Barrowman NJ, Hearn WS, Pollock KH (1998) Multiyear tagging studies incorporating fishing effort data. Can J Fish Aquat Sci 55:1466–1476CrossRefGoogle Scholar
  29. Homma K, Maruyama T, Itoh T, Ishihara H, Uchida S (1999) Biology of the manta ray, Manta birostris Walbaum, in the Indo-Pacific. In: Sèret B, Sire J-Y (eds) Proceedings of the 5th Indo-Pacific Fish Conference, Noumea, 1997. Sociéte Français d’Ichthologie, Paris, pp 209–216Google Scholar
  30. Jolly GM (1965) Explicit estimates from capture-recapture data with both death and immigration - Stochastic model Biometrika 52Google Scholar
  31. Kitchen-Wheeler A-M (2008) Migration behaviour of the Giant Manta (Manta birostris) in the Central Maldives Atolls. In: Donnelly MA (ed) Joint meeting of icthylologists and herpetologists. Montreal, Canada, p 213Google Scholar
  32. Kitchen-Wheeler A-M (2010) Visual identification of individual manta ray (Manta alfredi) in the Maldives Islands. Western Indian Ocean Marine Biology Research 4:351–363Google Scholar
  33. Klimley AP (1983) Social organization of schools of the scalloped hammerhead shark, Sphyrna lewini (Griffith and Smith), in the Gulf of California., California University,Google Scholar
  34. Klimley AP (1987) The determinants of sexual segregation in the scalloped hammerhead shark, Sphyrna lewini. Environ Biol Fishes 18:27–40CrossRefGoogle Scholar
  35. Kohler N, Turner P (2001) Shark tagging: A review of conventional methods and studies. Environ Biol Fishes 60:191–223CrossRefGoogle Scholar
  36. Krefft JLG (1868) Deratoptera alfredi (Prince Alfred’s ray). Illustrated Sydney News (11th July) 5(50):1–16Google Scholar
  37. Last PR, Stevens JD (1994) Sharks and Rays of Australia. CSIRO, AustraliaGoogle Scholar
  38. Marshall A, Pierce SJ, Bennett M (2008) Morphological measurements of manta rays (Manta birostris) with a description of a foetus from the east coast of Southern Africa. Zootaxa 1717:24–30Google Scholar
  39. Marshall AD, Bennett MB (2010a) The frequency and effect of shark-inflicted bite injuries to the reef manta ray Manta alfredi. Afr J Mar Sci 32:573–580CrossRefGoogle Scholar
  40. Marshall AD, Bennett MB (2010b) Reproductive ecology of the reef manta ray Manta alfredi in southern Mozambique. J Fish Biol 77:169–190PubMedCrossRefGoogle Scholar
  41. Marshall A, Ishihara H, Dudley SFJ, Clark TB, Jorgensen S, Smith WD, Bizzaro JJ (2006) Manta birostris IUCN 2006 2006 IUCN Red List of Threatened SpeciesGoogle Scholar
  42. Marshall AD, Compagno LJV, Bennett MB (2009) Redescription of the genus Manta with resurrection of Manta alfredi (Krefft,1868) (Chondrichthyes; Myliobatoidei; Mobulidae). Zootaxa 2301:1–28Google Scholar
  43. Marshall AD, Dudgeon CL, Bennett MB (2011) Size and structure of a photographically identified population of manta rays Manta alfredi in southern Mozambique. Mar Biol 158:1111–1124CrossRefGoogle Scholar
  44. Matthews JN, Steiner L, Gordon J (2001) Mark-recapture analysis of sperm whale (Physeter macrocephalus) photo-id data from the Azores (1987–1995). Journal of cetacean research and management 3Google Scholar
  45. Michael SW (1993) Reef sharks and rays of the world: a guide to their identification, behaviour, and ecology. Sea Challengers, MontereyGoogle Scholar
  46. Ministry of Tourism and Civil Aviation (2007) Maldives tourism third master plan 2007–2011. Maldives Government, MaleGoogle Scholar
  47. Myrberg AA, Gruber S (1974) Behavior of bonnethead shark, Sphyrna tiburo. Copeia 2:358–374CrossRefGoogle Scholar
  48. O’Shea OR, Kingsford MJ, Seymour J (2010) Tide-related periodicity of manta rays and sharks to cleaning stations on a coral reef. Mar Freshwater Res 61:65–73CrossRefGoogle Scholar
  49. Otis DL, Burnham KP, Anderson DR, White GC (1978) Statistical inference from capture data on closed animal populations. Wildlife Monographs 1–35Google Scholar
  50. Petersen CGJ (1896) The early immigration of young plaice into Limfjord from the German sea, etc. Rep Danish Biol Station 6:1–48Google Scholar
  51. Pollock KH (1982) A capture-recapture design robust to unequal probabilities of capture. J Wildl Manag 46:757–760CrossRefGoogle Scholar
  52. Pollock KH (2000) Capture-Recapture Models. Journal of American Statistical Association 95Google Scholar
  53. Pratt HL, Carrier JC (2005) Elasmobranch Courtship and Mating Behaviour. In: Hamlett WC (ed) Reproductive biology and phylogeny of chondrichthyes. Science Publishers, Enfield, pp 129–169Google Scholar
  54. Riede K (2004) Global register of migratory species- from global to regional scales. Final report of the R&D-Project 808 05 081. Federal Agency for Nature Conservation, Bonn 329Google Scholar
  55. Rowat D, Engelhardt U (2007) Seychelles: A case study of community involvement in the development of whale shark ecotourism and its socio-economic impact. Fish Res 84:109–113CrossRefGoogle Scholar
  56. Schwarz CJ, Arnason AN (1996) A general methodology for the analysis of open-model capture recapture experiments. Biometrics 52:860–873CrossRefGoogle Scholar
  57. Seber GAF (1965) A note on the multiple recapture census. Biometrika 52:249–259PubMedGoogle Scholar
  58. Seber GAF (1982) The estimation of animal abundance and related parameters. Macmillan Publishing, New YorkGoogle Scholar
  59. Seber GAF (1986) A review of estimating animal abundance. Biometrics 42(2):267–292PubMedCrossRefGoogle Scholar
  60. Silva MA, Magalhães S, Prieto R, Serrão Santos R, Hammond PS (2009) Estimating survival and abundance in a bottlenose dolphin population taking into account transience and temporary emigration. Mar Ecol Prog Ser 392:263–276CrossRefGoogle Scholar
  61. Smith JLB, Smith MM (1966) Fishes of the Tsitsikama coastal national park. National Parks Board of Trustees of the Republic of South Africa, JohannesburgGoogle Scholar
  62. Springer S (1960) Natural history of the sandbar shark, Eulamia milberti. US Fisheries bulletin 61:1–38Google Scholar
  63. Topelko KN, Dearden P (2005) The shark watching industry and its potential contribution to shark conservation. J Ecotourism 4:108–128CrossRefGoogle Scholar
  64. Walbaum JJ (1792) Petri Artedi Sueci Genera Piscium. Ant. Ferdin. Rose, Greifswald (Germany)Google Scholar
  65. Walker TI (2005) Reproduction in Fisheries Science. In: Hamlett WC (ed) Reproductive biology and phylogeny of chondrictheyes. Science Publishrs, Inc, Enfield, pp 81–127Google Scholar
  66. White WT, Giles J, Dharmadi PIC (2006) Data on the bycatch fishery and reproductive biology of mobulid rays (Myliobatiformes) in Indonesia. Fish Res 82:65–73CrossRefGoogle Scholar
  67. Whitley GP (1936) The Australian devil ray, Daemomanta alfredi (Krefft), with remarks on the superfamily Mobulidae (order Batoidei). Aust Zool 8:164–188Google Scholar
  68. Youngbluth MJ (1968) Aspects of the ecology and ethology of the cleaning fish Labroides phthirophagus Randall. Z Tierpsychol 25:915–932CrossRefGoogle Scholar
  69. Zeller DC, Russ GR (2000) Population estimates and size structure of Plectropomus leopardus (Pisces: Serranidae) in relation to no-fishing zones: Mark-release-resighting and underwater visual census. Mar Freshw Res 51:221–228CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Anne-Marie Kitchen-Wheeler
    • 1
  • Csilla Ari
    • 2
  • Alasdair J. Edwards
    • 1
  1. 1.School of BiologyNewcastle UniversityNewcastle Upon TyneUK
  2. 2.USF Health Byrd Alzheimer’s Center and Research InstituteTampaUSA

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