Abstract
The south Pacific iguanas (Brachylophus) currently have three recognized living species in Fiji. Recent surveys have uncovered more specific variation (morphological and genetic) within the genus and have better defined the geographic ranges of the named species. One of these recent discoveries is a strikingly different iguana from all other island populations in Fiji which is restricted to Gau Island of the Lomaiviti Province. Gau is the fifth largest island in Fiji and maintains excellent upland forests in the higher elevations. We describe this population from Gau Island as a new species, Brachylophus gau sp. nov., in recognition of its type locality.
References
David, A. (1995) The Voyage of HMS Herald to Australia and the South-west Pacific 1852-1861 under the command of Captain Henry Mangles Denham. Melbourne University Press, Carlton, Victoria, 521 pp.
Fisher, R.N., Thomson, P., Watling, D. & Harlow, P. (2013) Brachylophus bulabula (Fiji Banded Iguana). Predation. Herpetological Review, 44, 140–141.
Gibbons, J.R.H. (1981) The biogeography of Brachylophus including the description of a new species, B. vitiensis, from Fiji. Journal of Herpetology, 15, 255–73.
https://doi.org/10.2307/1563429Gibbons, J.R.H. (1984) Iguanas of the south Pacific. Oryx, 18, 82–91.
https://doi.org/10.1017/S0030605300018755Gibbons, J.R.H. (1985) The biogeography and evolution of Pacific island reptiles and amphibians. In: Grigg, G., Shine, R. & Ehmann, H. (Eds.), The Biology of Australasian Frogs and Reptiles. Surrey Beatty and Sons, Sydney, pp.125–142.
Gibbons, J.R.H. & Watkins, I.F. (1982) Behavior, ecology, and conservation of South Pacific banded iguanas, Brachylophus, including a newly discovered species. In: Burghart, G.M. & Rand, A.S. (Eds.), Iguanas of the World. Noyes, Park Ridge, pp. 418–441.
Harlow, P.S., Fisher, M., Tuiwawa, M., Biciloa, P.N., Palmeirim, J.M., Mersai, C., Naidu, S., Naikatini, A., Thaman, B., Niukula, J. & Strand, E. (2007) The decline of the endemic Fijian crested iguana Brachylophus vitiensis in the Yasawa and Mamanuca archipelagos, western Fiji. Oryx, 41, 44–50.
https://doi.org/10.1017/S0030605307001639Ineich, I. & Fisher R.N. (2016) Rediscovery of the 220-year-old holotype of the Banded Iguana, Brachylophus fasciatus (Brongniart, 1800) in the Paris Natural History Museum. Zootaxa, 4138, 381–391.
https://doi.org/10.11646/zootaxa.4138.2.10Keogh, J.S., D.L. Edwards, Fisher, R.N. & Harlow P.S. (2008) Molecular and morphological analysis of the critically endangered Fijian iguanas reveals cryptic diversity and a complex biogeographic history. Philosophical Transactions of the Royal Society B, 363, 3413–3426.
https://doi.org/10.1098/rstb.2008.0120Keppel, G., Buckley, Y.M. & Possingham H.P. (2010) Drivers of lowland rain forest community assembly, species diversity and forest structure on islands in the tropical South Pacific. Journal of Ecology, 98, 87—95.
https://doi.org/10.1111/j.1365-2745.2009.01595.xMacGillivray, J. (1855) Private journal of John MacGillivray, naturalist, in HMS Herald, in a voyage to the Pacific: with charts and views. Vol. II: with an envelope containing papers not copied into the Journal. The National Archives, Kew, ADM 7/852.
Morrison, C. (2003) A field guide to the herpetofauna of Fiji. Institute of Applied Sciences, University of the South Pacific, Fiji, 121 pp.
Olson, D., Farley, L., Patrick, A., Watling, D., Tuiwawa, M., Masibalavu, V., Lenoa, L., Bogiva, A., Qauqau, I., Atherton, J., Caginitoba, A., Tokota’a, M., Prasad, S., Naisilisili, W., Raikabula, A., Mailautoka, K., Morley, C. & Allnutt T. (2010) Priority forests for conservation in Fiji: landscapes, hotspots and ecological processes. Oryx, 44, 57–70.
https://doi.org/10.1017/S0030605309990688Pregill, G.K. & Steadman, D.W. (2004) South Pacific iguanas: Human impacts and a new species. Journal of Herpetology, 38, 15–21.
https://doi.org/10.1670/73-03APregill, G.K. & Worthy, T.H. (2003) A new iguanid lizard (Squamata, Iguanidae) from the later Quaternary of Fiji, Southwest Pacific. Herpetologica, 59, 57–67.
https://doi.org/10.1655/0018-0831(2003)059[0057:ANILSI]2.0.CO;2Priddel, D., Carlile, N., Moce, K. & Watling D. (2009) A review of records and recovery actions for the ‘Critically Endangered’ Fiji Petrel Pseudobulweria macgillivrayi. Bird Conservation International, 18, 381–393.
https://doi.org/10.1017/S0959270908007648Remling, E. & Veitayaki, J. (2016) Community-based action in Fiji’s Gau Island: A model for the Pacific? International Journal of Climate Change Strategies and Management, 8, 375–398.
https://doi.org/10.1108/IJCCSM-07-2015-0101Sarnat, E.M. & Moreau, C.S. (2011) Biogeography and morphological evolution in a Pacific island ant radiation. Molecular Ecology, 20, 114—130.
https://doi.org/10.1111/j.1365-294X.2010.04916.xTownsend, T.M., Mulcahy, D.G., Noonan, B.P., Sites Jr., J.W., Kuczynski, C.A., Wiens, J.J. & Reeder, T.W. (2011) Phylogeny of iguanian lizards inferred from 29 nuclear loci and a comparison of concatenated and species-tree approaches for an ancient, rapid radiation. Molecular Phylogenetics and Evolution, 61, 363–380.
https://doi.org/10.1016/j.ympev.2011.07.008Watling, D. (1986) Rediscovery of a petrel and new faunal records on Gau Island. Oryx, 20, 31–34.
https://doi.org/10.1017/S0030605300025886Zug, G. (1991) The lizards of Fiji: Natural History and Systematics. Bishop Museum Press Honolulu, 136 pp.