Database of Marine Mammal Surveys and Abundance Estimates in The
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1 Database of aerial surveys and abundance estimates for beluga whales (Delphinapterus leucas) and narwhals (Monodon monoceros) in the Canadian Arctic Jeff W. Higdon and Steven H. Ferguson2 Central and Arctic Region Fisheries and Oceans Canada 501 University Crescent Winnipeg, MB R3T 2N6 2017 Canadian Technical Report of Fisheries and Aquatic Sciences 3211 2 Canadian Technical Report of Fisheries and Aquatic Sciences Technical reports contain scientific and technical information that contributes to existing knowledge but which is not normally appropriate for primary literature. Technical reports are directed primarily toward a worldwide audience and have an international distribution. No restriction is placed on subject matter and the series reflects the broad interests and policies of Fisheries and Oceans Canada, namely, fisheries and aquatic sciences. Technical reports may be cited as full publications. The correct citation appears above the abstract of each report. 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Les demandes de rapports seront satisfaites par l'établissement auteur dont le nom figure sur la couverture et la page du titre. Les numéros 1 à 456 de cette série ont été publiés à titre de Rapports techniques de l'Office des recherches sur les pêcheries du Canada. Les numéros 457 à 714 sont parus à titre de Rapports techniques de la Direction générale de la recherche et du développement, Service des pêches et de la mer, ministère de l'Environnement. Les numéros 715 à 924 ont été publiés à titre de Rapports techniques du Service des pêches et de la mer, ministère des Pêches et de l'Environnement. Le nom actuel de la série a été établi lors de la parution du numéro 925. i Canadian Technical Report of Fisheries and Aquatic Sciences 3211 2017 Database of aerial surveys and abundance estimates for beluga whales (Delphinapterus leucas) and narwhals (Monodon monoceros) in the Canadian Arctic by Jeff W. Higdon1 and Steven H. Ferguson2 1 Higdon Wildlife Consulting 912 Ashburn Street Winnipeg, MB R3G 3C9 2 Central and Arctic Region Fisheries and Oceans Canada 501 University Crescent Winnipeg, MB R3T 2N6 ii © Her Majesty the Queen in Right of Canada, 2017 Cat. No. Fs97-6/3211E-PDF ISBN 978-0-660-08279-0 ISSN 1488-5379 Correct citation for this publication: Higdon, J.W., and Ferguson, S.H.. 2017. Database of aerial surveys and abundance estimates for beluga whales (Delphinapterus leucas) and narwhals (Monodon monoceros) in the Canadian Arctic. Can. Tech. Rep. Fish. Aquat. Sci. 3211: v + 48 p. iii TABLE OF CONTENTS ABSTRACT .................................................................................................................................. iv SOMMAIRE .................................................................................................................................. v INTRODUCTION .......................................................................................................................... 1 Stock definitions ......................................................................................................................... 1 Prior database versions ............................................................................................................... 2 METHODS ..................................................................................................................................... 2 RESULTS ....................................................................................................................................... 3 DISCUSSION ................................................................................................................................ 3 Beluga whale surveys and abundance estimates ........................................................................ 3 Narwhal surveys and abundance estimates ................................................................................ 4 SUMMARY AND CONCLUSIONS ............................................................................................. 5 REFERENCES ............................................................................................................................... 7 Table 1. Stocks of narwhals and beluga whales occurring in Canadian Arctic waters. ............... 14 Table 2. Number of beluga whale surveys (and associated abundance estimates) in the Canadian Arctic, by summer stock, per decade. ........................................................................................... 15 Table 3. Number of narwhal surveys (and associated abundance estimates) in the Canadian Arctic, by summer stock, per decade........................................................................................................ 15 Figure 1. Summer ranges of beluga (Delphinapterus leucas) stocks in the Canadian Arctic. ..... 16 Figure 2. Summer ranges of narwhal (Monodon monoceros) stocks in the Canadian Arctic. For Somerset Island stock, the map shows the overall stock range (stippled green) and the early August concentration area (solid green) where aerial surveys have focused. Some West Greenland stocks (that do not range into Canadian waters) not shown. ................................................................... 17 Figure 3. Number of beluga (Delphinapterus leucas) and narwhal (Monodon monoceros) surveys and associated population estimates in the Canadian Arctic, for all summer stocks, per decade. 18 Appendix - Database of aerial surveys for beluga whales and narwhal in the Canadian Arctic .. 19 Table A1. Database of beluga whale (Delphinapterus leucas) aerial surveys and associated abundance estimates, by summer stock, in the Canadian Arctic. ................................................. 20 iv ABSTRACT Higdon, J.W., and Ferguson, S.H.. 2017. Database of aerial surveys and abundance estimates for beluga whales (Delphinapterus leucas) and narwhals (Monodon monoceros) in the Canadian Arctic. Can. Tech. Rep. Fish. Aquat. Sci. 3211: v + 48 p. Information on abundance and trends of Canadian beluga whale (Delphinapterus leucas) and narwhal (Monodon monoceros) stocks is needed for long-term monitoring and sustainable harvest management. We conducted a literature review of surveys and associated abundance estimates for the beluga and narwhal summer stocks that occur in Canadian Arctic waters. Abundance estimates were compiled by management stock as defined by Fisheries and Oceans Canada (DFO). Some stocks are shared with other countries (i.e., USA [Alaska], Greenland), and some occur in multiple Canadian jurisdictions (e.g., Nunavut and Nunavik). Metadata in the database includes area studied, time frame, survey type, uncorrected and corrected (if available) abundance estimate, measures of variability around the point estimate (confidence intervals, coefficient of variation), types of corrections for availability and perception bias, trends in abundance estimates, and limitations and sources of uncertainty. The database contains 34 records for beluga whale surveys conducted between 1965 and 2015, and 22 records for narwhal surveys conducted between 1975 and 2013. All stocks have been surveyed at least once, and some stocks have been surveyed numerous times (e.g., Admiralty Inlet narwhal, Nunavik beluga stocks). The focus has been on peer-reviewed scientific publications and government documents where the primary goal was abundance estimation. For stocks that are shared with other countries, the database includes Canadian studies only, but estimates generated by research in these other jurisdictions could contribute to trend analyses. Similarly, a number of consulting company reports also detail industry-funded surveys that have been conducted throughout the Canadian Arctic. These surveys are generally conducted for different reasons (impact predictions versus population estimates) and are not peer-reviewed. Example reports from relevant industry-funded studies are noted in