National Marine Fisheries Service U.S DEPARTMENT OF COMMERCE AFSC PROCESSED REPORT 2OOO.1 1 Marine Mammal Protection Act and Endangered Species Act lmplementation Program 1 999 December 2000 This report does not constitute a publication and is for information only. All data herein are to be considered provisional. ERRATA NOTICE This document is being made available in .PDF format for the convenience of users; however, the accuracy and correctness of the document can only be certified as was presented in the original hard copy format. Inaccuracies in the OCR scanning process may influence text searches of the .PDF file. Light or faded ink in the original document may also affect the quality of the scanned document. Marine Mammal Protection Act and Endangered Species Act Implementation Program 1999 Edited by: Anita L. Lopez Douglas P. DeMaster Annual Reports ofresearch carried out on the population biologt of marine mammals by the National Marine Mammal Laboratory to meet the 1994 amendments to the Marine Mammal Protection Act and the Endangered Species Act Submitted to: Office of Protected Resources National Marine Fisheries Service 1335 East-West Highway Silver Spring, MD 20910 National Oceanic and Atmospheric Administration National Marine Fisheries Service Alaska Fisheries Science Center National Marine Mammal Laboratory 7600 Sand Point Way Northeast Seattle, WA 98115-0070 December 2000 Preface Beginning in 1991, the National Marine Mammal Laboratory NMML) has been partially funded by the National Marine Fisheries Service's (NÀ/ßS) Office of Protected Resources to determine the abundance of selected species in U.S. waters of the eastern North Pacific Ocean. On 30 April 1994, Public Law 103-238 was enacted allowing significant changes to provisions within the Marine Mammal Protection Act (MMPA). Interactions between marine mammals and commercial fisheries are addressed under three new Sections. This new regime replaced the interim exemption that had regulated fisheries-related incidental takes since 1988. The 1994 MMPA amendments continue NMFS' responsibility to carry out population studies to determine the abundance, distribution and stock identification of marine mammal species that might be impacted by human-related or natural causes. The following report, containing 17 papers, is a compilation of studies carried out with fiscal year 1999 (FY99) funding as part of the NMFS MMPA/ESA Implementation Program. The report contains information regarding studies conducted on beluga whales, California sea lions, gray whales, harbor porpoise, harbor seals, humpback whales, ice seals, northern fur seals, and Steller sea lions. This report does not constitute a publication and is for information only. All data herein are to be considered provisional. Further, most of the papers included in this report may be published elsewhere. Any question concerning the material contained in this document should be directed to the authors, or ourselves. Reference to trade names does not imply endorsement by the National Marine Fisheries Service, NOAA. Anita L.Lopez Douglas P. DeMaster lll MMPAÆSA Implementation Program Report for 1999 Reporting Center: National Marine Mammal Laboratory Alaska Fisheries Science Center Adminishative Office: Office of Protected Resowces National Marine Fisheries Service Page No. Beluga Whales: Rugh, D.J., K.E.V/. Shelden, B.A. Mahoney, L.K. Lítzky, R.C. Hobbs, and K. L. Laidre Aerial surveys of beluga whales in Cook Inlet, Alaska, June 1999. I Ferrero, R.C. 1999 Cook Inlet beluga tagging project - field report. 11 Shelden, K.E.W. Aerial surveys of belugas in northeastem Bristol Bay, Alaska, May-June 1999. 2l California Sea Lions: Lazke,J. L., S. R. Melin, and R.L. Delong Survival and natality rates of California sea lions (Zalophus californianns) from a branding study at San Miguel Island, California. 35 Cetaceans: Moore, S.E., and D.P. DeMaster North Pacific right whale and bowhead whale habitat study: R/V Alpha Helix and CCG Laurier cruises, July 1999. 59 Moore, S.E., J.M. Waite, L.L.M:azzlca and R.C. Hobbs Provisional estimates of mysticete whale abundance on the Central Bering Sea shelt 1999. 63 Waite, J.M., and R.C. Hobbs Small cetacean aerial survey in Bristol Bay and the south side of the Alaska Peninsula in 1999. 81 Harbor Seals: 'Withrow, D.E., J.C. Cesatone, J.K. Jansen and J'L' Bengtson Abundance and distribution of harbor seals (Phoca vitulina richardsi) along the Aleutian Islands dwing 1999. 91 Larnboum, D.M., S.J. Jeffries, and H.R. Huber Serological testing of harbor seals (Phocavitulina) tn Washington, 1998-1999. 117 Purcell, Maureen, G. Mackey, E. Lallood, G. Bastrup, H. Huber and L. Pa¡k Genetic identification of salmonid bone from harbor seal scat. 129 Humpback'Whales: Mizroch, S'A', and S.A.D' Harkness Update on the north Pacific humpback whale fluke photogaph có[ection, August 2000. 143 Ice Associated Seals: Bengtson,J.L.,P.L.Boveng,L.M.Hiruki-Raring,K'L'Laidre' C. PungowiYi, and M.A. SimPkins Abundance and distribution of ringed seals (Phoca hispida) in The coastal Chukchi sea, Alaska, May-June 1999' I49 Bengtson, J.L., and P.L. Boveng Mortality estimation anil harvest monitoring of Arctic ice seals' 161 Northern Fur Seals: Loughlin, T.R., and E.H. Sinclair Northem fur seal studies conducted on the Pribilof Islands and Bogoslof Island, 1999. 165 v1 Pinnipeds: Gearin, P.J., L.L. Lehman, K.M. Hughes, J.L. Laake, R.L. Delong, L. Cooke, M.E. Gosho, T. Orr and J. Griffith Írvestigations of pinniped interaotions with Lake Ozette sockeye salmon, Oncorhynchus nerka, 1999. 17l Steller Sea Lions: Chumble¡ V/inter Steller sea lion prey and foraging studies, (Cruise SMMOCI-991)2-25 March 1999. 181 Loughlin, T.R., and C. Kurle Fatfy acid profiles of Steller sea lions and north Pacific Ocean forage fishes, a pilot study using northem fur seals. 193 vll AERIAL SURVEYS OF BELUGA WHALES IN COOK INLET, ALASKA, JUNE 1999 David J. Rughl, Kim E.'W. Sheldenr, BarbaraA. Mahonet',LauraK. Litzþl, Roderick C. Hobbsr, and Kristin L. Laidret rNational Marine Mammal Laboratory Alaska Fisheries Science Center National Marine Fisheries Service, NOAA 7600 Sand Point WayNE Seattle, Washington 98115, U.S.A. and 2Alaska Regional Office National Marine Fisheries Service, NOAA 222W 7th Ave., Box 43 Anchorage, Alaska 99513, U.S.A. Abstract The National Marine Fisheries Service (l\rNßS) conducted an aerial survey of the beluga whale population in Cook Inlet, Alaska, during 8-14 June 1999. The 41.5 hr surveywas flown in a twin-engine, high-wing aircraft at an altitude of 244 m (800 ft) and speed of 185 km/hr (100 kt) along a trackline 1.4 km from shore, consistent with annual surveys flown each year since 1993. The flights in 1999 included one or more surveys of coastal areas around nearly the entire Inlet and 1,790 km oftransects across the Inlet. Paired, independent observers searched on the coastal (left) side of the plane, where virtually all sightings occur, while a single observer and a computer operatorldatarecorder were on the right side. In addition, each day a different visitor observed from the left side. After finding beluga groups, a series of aerial passes were made to allow at least two pairs of primary observers to make four or more counts of each Soup. Inter-day counts ranged from 75 to160 belugas near the Susitna River (between the Beluga and Little Susitna Rivers), 13 to 43 in Knik Arm, and 17 to 30 in Chickaloon Bay, but no belugas were found in lower Cook Inlet. The sum of the aerial estimates (using median counts from each site, not corrected for missed whales) ranged from 197 to 221 whales, depending on observer. The index count for 1999 is 217 , which is slightly higher than the index counts for 1998 (193) but lower than all index counts by NMFS observers between 1993-97 . Introduction Beluga whales (Delphinapterus leucas) are distributed around most of Alaska from Yakutat Bay to the Alaska/Yukon border Qlazard 1988). Five stocks are recognized: Cook frlet, Bristol Bay, Eastern Bering Sea, Eastern Chukchi Sea, and the Beaufort Sea (Hill and DeMaster 1998; O'Corry-Crowe et al. L997). The most isolated of these is the Cook Inlet stock, separated from the others by the Alaska Peninsula (Laidre et al. in prep.). Beluga whales in Cook Inlet are very concentrated in a few river mouths during parts of the year (Rugh et al. in prep.). The geographic and genetic isolation of the whales in Cook Úrlet, in combination with their tendency towards site fidelity, makes this stock vulnerable to impacts from large or persistent harvests. The NMFS National Marine Mammal Laboratory NMML) and Alaska Regional Office whales have conducted annual aerial survoys to study the distribution and abundance of beluga in Cook Inlet each June/July since 1993 (V/ithrow et al. 1994; Rugh et al. 1995, 1996,1997a, Igg¡b,l99g)in cooperation with the Alaska Beluga Whale Commission (ABWC) and the Cook Inlet Marine Mammal Council (CIMMC). A letter from the Alaska Regional Scientific to Review Group (ASRG) to S. Pennoyer, NMFS, dated 13 May 1997, strongly urged NMFS continue these surveys every year. Aerial surveys are proven to be the most efficient method for collecting distribution and abundance data for beluga whales in Cook Inlet (Klinkhart 1966; have been Calkins et al.I97S;Murray and Fay 1979; CalÞ,rns 1984). The most recent studies some of the most thorough and intensive (Rugh et af in prep')' Methods The survey aircraft, an Aero Commander 680 FL (N7UP),has twin-engines, high- pilot. wings, lg-hr flying capability, and is equipped with seating for five passengers and one the search area. Th; are bubble wináows at each of the four observer positions, maximizing A An intercom system provided communication among the observers, data recorder, and pilot' Location selective listening control device was used to aurally isolate the observer positions.