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Shining a spotlight on the biodiversity of New Zealand’s marine ecoregion BIODIVERSITY – NEW ZEALAND’S MARINE ECOREGION ■ 1 Shining a spotlight on the biodiversity of New Zealand’s marine ecoregion Experts Workshop on Marine Biodiversity 27-28 May 2003 Wellington New Zealand Allison Arnold, Editor WWF-New Zealand TO CONTENTS➲ Shining a spotlight on the biodiversity of New Zealand’s marine ecoregion Experts Workshop on Marine Biodiversity. 27-28 May 2003, Wellington, New Zealand Edited by Allison Arnold WWF-New Zealand PO Box 6237 Wellington New Zealand (64) 4 499 2930 www.wwf.org.nz ©2004 WWF-New Zealand ISBN 0-9582592-1-6 (with corrections 2005) ISBN 0-9582592-0-8 (print version, reprinted with corrections 2005) This publication should be cited as follows: Arnold, A. (ed.) 2004. Shining a spotlight on the biodiversity of New Zealand’s marine ecoregion: Experts workshop on marine biodiversity, 27-28 May 2003, Wellington, New Zealand. WWF-New Zealand, Welling- ton. Reproduction, adaptation, or issuing of this publication for educational or other non- commercial purposes, by electronic or any other means, is authorised without prior permission of the copyright holder(s). Any reproduction in full or in part of this publication must mention the title and credit WWF-New Zealand as the copyright owner. Reproduction, adaptation, or issuing of this publication, by electronic or any other means, for re-sale or other commercial purposes is prohibited without the prior permission of the copyright holder(s). ®WWF-World Wide Fund For Nature (Formerly World Wildlife Fund) Registered Trademark Cover images were kindly supplied by (clockwise from top): • northern royal albatross – ©2004 DOC, Te Papa Atawhai/AE Wright; • Hector’s dolphins – ©2004 Will Rayment; • yellow-eyed penguin – ©2004 DOC, Te Papa Atawhai/R Morris; • invertebrate assemblages – ©2004 Franz Smith; • blue cod – ©2004 DOC, Te Papa Atawhai/P Ryan; • eagle ray – ©2004 DOC, Te Papa Atawhai. TO CONTENTS➲ Contents Acknowledgments 2 Executive Summary 3 1.0 Introduction 5 1.1 The biological diversity of New Zealand’s marine ecoregion 5 1.2 Scope of this report and relation to other information initiatives in New Zealand 6 1.3 WWF and the Ecoregion Approach to Conservation 6 1.4 The New Zealand Marine Ecoregion 7 2.0 Methods 9 2.1 Defining and identifying key biodiversity areas and features 9 2.2 Identifying information gaps and other obstacles to assessing marine biodiversity 11 2.3 Identifying future steps for the assessment and conservation of biodiversity; and formulating a statement from the workshop participants 11 3.0 Results 13 3.1 The Oceanography of the New Zealand Marine Ecoregion 15 3.2 Cetaceans, seals, and seabirds 19 3.3 Fishes 33 3.4 Benthic invertebrates, algae, and plants 47 3.5 Information gaps and other obstacles to assessing marine biodiversity 74 3.6 Future steps for the assessment/conservation of biodiversity; and a common statement for the conservation of New Zealand’s marine biodiversity 74 4.0 Discussion 77 5.0 References 79 Appendix 1: WWF Methodology for selection of the Global 200 ecoregions 81 Appendix 2: Information-based initiatives underway for New Zealand’s marine environment 82 Appendix 3: Workshop reporting form (Biodiversity Assessment Site Form) 83 Appendix 4: Workshop participants 84 BIODIVERSITY – NEW ZEALAND’S MARINE ECOREGION ■ 1 Acknowledgments This report was prepared by Allison Robinson, Parker Jones, Michelle Cooper, Arnold, the co-ordinator for the New and Oli Helm of Eagle Technology; Zealand Marine Ecoregion. Vaughn Stagpoole and Kelly Beuth at the Institute of Geological and Nuclear The workshop was organised and funded Sciences (IGNS); Bronwen Golder of by WWF-New Zealand with contributions WWF International; Ruth Gregg, Jo from Oceans Policy and the WWF Breese, Chris Howe, Miriam Richardson, International Ecoregion Partnerships and Angela Heck of WWF-New Zealand, Grant. Kurt Buri of Buri Graphics; and Simon Childerhouse, Martin Cryer, Peter Publication of the workshop report was McMillan, Paul Sagar, Nick Shears, and funded by the Ministry of Fisheries. Franz Smith. The results of the workshop are due to the collaborative efforts of the marine Many other people contributed to experts (Appendix 4) who contributed the success of the workshop and the their scientific knowledge and committed preparation of the report. many hours to produce the outputs. Many thanks are due to the National Institute of This report aims to be an accurate Water and Atmospheric Research (NIWA), record of the discussions and material The National Museum of New Zealand generated at the Marine Biodiversity – Te Papa Tongarewa, The Department Workshop held on the 27–28 May 2003, of Conservation (DoC), the University and during subsequent expert review. of Otago, Environment Waikato, and the The content of this publication does not Queensland Museum for releasing their necessarily reflect the views of WWF or staff, and to the individuals for their time. the workshop participants’ employers, or other organisations that have supported WWF-New Zealand would also like to this process. thank the following for their valuable contributions: Glen Lauder and Sarah Wilson of Common Ground; Peng Aik Lim, Nick 2 ■ BIODIVERSITY – NEW ZEALAND’S MARINE ECOREGION Executive Summary The distinctive nature of New Zealand’s literature. Biodiversity features that do marine biodiversity has led to its not lend themselves readily to discrete identification by WWF as one of 238 geographic representation were reported, ecoregions (collectively known as the but were not illustrated on the maps. The Global 200) that are global priorities for oceanographers worked separately to conservation action. An ecoregion is a report on the physical processes operating large area of land or water that contains in New Zealand’s marine environment. a geographically distinct assemblage of natural communities that share a large Experts identified areas of deepwater majority of their species, ecological emergence in Fiordland and Marlborough dynamics, and environmental conditions. Sound where species are found at Planning at the large scale of the ecoregion unusually shallow depths due to the is consistent with an ecosystem-based unique physical characteristics of these approach to management. The ecoregion environments. They noted the high approach promotes conservation efforts in productivity of the hydrographically accordance with ecological processes and complex Chatham Rise, the remarkable systems rather than along administrative invertebrate diversity of Spirits Bay, and boundaries, thereby creating new the expanding coverage of mangroves conservation opportunities. in northern New Zealand. Seabird experts highlighted the importance of With the long-term aim of contributing to the subantarctic and Chatham Islands marine biodiversity conservation, WWF- as global hotspots for bird diversity, and New Zealand established the New Zealand the importance of migration corridors Marine Ecoregion Initiative in 2003, around New Zealand. Marine mammal which is part of WWF’s global approach experts marked the canyon and trench to mobilise conservation efforts in priority systems running from Kaikoura Canyon regions of the world. In response to northwards as attractive foraging areas the need for an independent, scientific for deep-diving cetacean species, such assessment of New Zealand’s marine as sperm whales. Overall, the work of biodiversity, WWF-New Zealand convened the marine scientists shines a spotlight marine scientists for an expert workshop on key areas for biodiversity in New that was held from 27-28 May 2003. The Zealand’s marine environment, contributes 22 workshop participants, who came to the greater body of knowledge of the from around the New Zealand region, ecoregion’s marine biodiversity, and hold expertise in taxonomy, ecology, makes such knowledge available in a oceanography, and conservation. They summarised and accessible form. collectively have specialist knowledge across a wide range of marine organisms The results of the workshop are and habitats in New Zealand. constrained by the limited biological sampling that has been conducted in New During the workshop participants divided Zealand’s marine environment. In addition into three subgroups that corresponded to identifying areas that are thought to with the types of biota for which they be important for marine biodiversity, had specialist knowledge: cetaceans, workshop participants identified some of seals, and seabirds; fish; and benthic the gaps in the knowledge base. Much invertebrates, algae, and plants. Guided effort has been put into research on the by a set of criteria that they had developed spatial distribution of marine organisms, in the first session of the workshop, and but there is still under-representation in furnished with bathymetric maps of the sampling efforts, such as for all species New Zealand region, the participants and habitats deeper than 1,500m, and for delineated key areas for the biodiversity specimens smaller than 2mm. Information of their respective biotic groups. Each deficiencies for ecosystem processes, area was coupled with a description of such as trophic interactions, population its physical and biological attributes, the dynamics, and recruitment are even state of information, and references to the greater. Participants expressed particular BIODIVERSITY – NEW ZEALAND’S MARINE ECOREGION ■ 3 concern about the challenge of addressing recognised that scientists have pathways information gaps given the scarcity