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New Records, Checklist and Biogeography of Kermadec Islands’ Coastal Fishes

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New Records, Checklist and Biogeography of Kermadec Islands’ Coastal Fishes www.aucklandmuseum.com New records, checklist and biogeography of Kermadec Islands’ coastal fishes Malcolm P. Francis National Institute of Water and Atmospheric Research Ltd Clinton A.J. Duffy Department of Conservation, Auckland War Memorial Museum Abstract The Kermadec Islands coastal fish fauna is still incompletely known, and recent expeditions there have added new fish records, and improved our understanding of its diversity and composition. This study documents 18 new fish records, presents an updated checklist of coastal fishes, and analyses the species biodiversity and biogeography. The coastal fish fauna now consists of 175 species and is dominated by tropical (45%) and subtropical (43%) species having Indo-Pacific or south-west Pacific distributions. Eight coastal species (4.6%) are endemic, but some of these, viz. Girella fimbriata, Parma kermadecensis and Chrysiptera rapanui, stray to north-eastern New Zealand. The coastal fish fauna of the Kermadec Islands is not particularly diverse but the mix of fish species present, the abundance of subtropical species, the presence of endemic species, and the abundance of top predators, produce a unique and interesting fauna. Keywords Distribution; endemism; fish fauna; Lord Howe Island; Norfolk Island; tropical; subtropical INTRODUCTION Francis 1991) that observed, photographed and collected many new fishes, resulting in another doubling of the Situated in the subtropical belt of the south-west Pacific fauna to 145 species (Francis 1993). Ocean and spanning about 250 km and 2.2 degrees of Although the Kermadec Islands fish fauna has latitude, the Kermadec Islands harbour an interesting many similarities with those of Norfolk and Lord Howe mix of tropical, subtropical and temperate fishes Islands, it also differs substantially in its richness and (Francis 1993). The Islands are small specks of land in a composition. The Kermadec Islands fauna is depauperate large ocean, with the nearest significant landmass (New compared with Norfolk and Lord Howe Islands, and Zealand) being about 730 km away. Norfolk Island and has a smaller proportion of tropical species and larger Lord Howe Island lie upstream to the west in similar proportions of subtropical and temperate species than latitudes in the north Tasman Sea. The Kermadec fish its western neighbours (Francis 1993). The Kermadec fauna is strongly influenced by the remoteness of the Islands also have a small number of endemic species, Islands and their location in a subtropical mixing zone, some of which, along with other subtropical fishes, are and the low frequency of recruitment of fish larvae from abundant. This creates a unique coastal fish fauna. upstream sources (Francis 1993). The Kermadec fish fauna is still incompletely known, The Kermadec Islands have attracted considerable and expeditions since 1993 have added further new records ichthyological attention despite being difficult to access. (Trnski et al. 2015), and an improved understanding of the The first checklist of fishes was published over 100 years diversity and composition of the coastal fishes. In this paper, ago by Waite (1910) and updated two years later (Waite we document new Kermadec coastal fishes based on visual 1912). Waite’s checklist contained 32 species of coastal records, present an updated checklist of coastal fishes, and fishes, many of which were collected by the naturalist analyse the species biodiversity and biogeography. W.R.B. Oliver who spent nine months at the Islands. After a gap of 73 years, the known fauna more than METHODS doubled to 72 species when Paulin & Stewart (1985) listed the Kermadec Islands teleost fishes held in the We define coastal fishes as those species that occur within Museum of New Zealand Te Papa Tongarewa. During 50 m of the surface and 1 km of the shore, excluding the mid 1980s and early 1990s, the advent of scuba oceanic pelagic species. Most species covered by this diving as a marine research tool led to several scientific study are reef fishes, but species living on or in sand, and expeditions (Schiel et al. 1986; Francis et al. 1987; in open water near the coast, are also included. Bulletin of the Auckland Museum 20: 481–495 http://www.aucklandmuseum.com/research/pub/bulletin/20/21 482 Malcolm P. Francis & Clinton A.J. Duffy Using the last checklist of Kermadec Islands coastal • Indo-Pacific – widespread in the Indian and Pacific fishes (Francis 1993) as a starting point, we compiled Oceans new fish records from the literature, unpublished • Worldwide – widespread in the Atlantic, Indian and documents, museum specimens, and observations made Pacific Oceans during two major scientific expeditions to the Kermadec Islands on 4–11 November 2004 (Duffy 2005) and 12–26 RESULTS May 2011 (Trnski & de Lange 2015), and other shorter scientific visits. Those expeditions employed extensive New Kermadec Islands fish records scuba diving, underwater photography and specimen Eighteen coastal fish species from 12 families are newly collecting using a range of techniques including the reported here from the Kermadec Islands (Table 1, ichthyocide rotenone, hand-spear, lines and set nets. Figures 1–15). Fourteen are also new records for the Here we report records of new coastal fishes that were New Zealand region. Sixteen of the new records are observed and photographed during both expeditions; supported by underwater photographs and identifica- new records represented by specimens deposited in tions were based on those. Two species, Parupeneus museum collections are reported elsewhere (Trnski et al. pleurostigma and Ecsenius bicolor were observed but 2015) but are included in the present checklist. not photographed; the former was readily identified Images were sent to fish specialists for confirmation by its distinctive colour pattern, and the latter was of species identifications: G. R. Allen (Western Australian distinguished from the similarly coloured Pictichromis Museum, Perth, Western Australia), J. H. Choat (James coralensis by colour pattern, steeply-sloping head, Cook University, Townsville, Australia), R. H. Kuiter benthic habitat, and ‘hopping’ movement (Randall (Aquatic Photographics, Seaford, Victoria, Australia), 2005). Photographs or specimens are required to confirm H. Motomura (Kagoshima University, Japan), J. E. these two identifications. Randall (Bishop Museum, Hawaii, USA), B. C. Russell Most of the new records were of large individuals, (Museum & Art Gallery of the Northern Territory, indicating that they had settled some months or years Darwin, Australia), and W. F. Smith-Vaniz (University earlier. All but one species were very rare, being represented of Florida, Florida Museum of Natural History, USA). by sightings of fewer than five individuals despite many A few species included in the previous checklist were hours of underwater observation. The exception was a omitted because (a) they were considered unlikely to species of Decapterus (family Carangidae) which formed occur shallower than 50 m around the Islands, (b) the small schools, often in association with Galapagos only known records were from the Kermadec Ridge sharks (Carcharhinus galapagensis). Francis (1993) some distance from the Islands themselves, or (c) there previously reported an unknown species of Decapterus were doubts about their identification. from the Kermadec Islands, and indicated that it may The affinities of checklist fishes with major water have been D. muroadsi. The Kermadec Decapterus has masses (tropical, subtropical and temperate), and a broad gold stripe along the upper body (Figure 3), and their geographical distributions, were determined it was tentatively confirmed from our images by W. F. from published and unpublished sources and personal Smith-Vaniz as D. ?muroadsi. This identification is communications with specialists. The distribution of consistent with the subtropical–temperate distribution each species was classified into one of nine categories: of this species in the south-west Pacific, which includes eastern Australia, northern New Zealand, Lord Howe • Endemic – found only at the Kermadec Islands, Island and possibly Norfolk Island (Francis 1993; Kuiter apart from a few strays recorded elsewhere 2000; Hoese & Gates 2006). Collection of specimens is • Kermadec to New Zealand – present at the Kermadec required to confirm this identification. Islands and elsewhere in New Zealand • Lord Howe to Kermadec – present at the Kermadec Diversity and biogeography Islands and one or both of Norfolk and Lord Howe A checklist of Kermadec Islands coastal fishes is given Islands in Appendix 1. Deletions and additions to the previous • Lord Howe to New Zealand – present at the checklist (Francis 1993) have resulted in a current total Kermadec Islands, New Zealand and one or both of of 175 known coastal fishes. The Kermadec Islands have Norfolk and Lord Howe Islands a depauperate fish fauna compared with those of Lord • South-west Pacific – species that range to Australia Howe and Norfolk Islands (with 518 and 270 species and/or tropical islands of the south-west Pacific (e.g. respectively) (Francis 1993; M. Francis unpubl. data). New Caledonia, Fiji, Tonga) The Kermadec fish fauna is composed mainly of tropical • South Pacific – species that range from Australia or (45%) and subtropical (43%) species, with a small Lord Howe Island to the central or eastern Pacific, proportion (10%) of temperate species (Table 2). Lord usually in subtropical waters Howe and Norfolk Islands have higher proportions of • Pacific – species present
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