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The Susitna River Delta As Calving Ground: Evidence Form Observation

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The Susitna River Delta As Calving Ground: Evidence Form Observation The Susitna River Delta as a calving ground: Tamara McGuire1, Amber Stephens1, Brad Goetz 1,2 Evidence from observation of a Cook Inlet beluga birth 1. LGL Alaska Research Associates, Inc. 2000 West International Airport Road, St C1 and the 2005-2015 seasonal and Anchorage, Alaska, USA 99502 [email protected], [email protected] geographic patterns of neonaten 2. Kincaid Elementary School, Anchorage, Alaska. occurrence in Upper Cook Inlet. .. ·.. Little Susitna . ,· River Background . .. Birth Observed .:- Sitsi/tia._. RrJ~r The scientific literature has not identified if distinct calving grounds and calving ':·:·:::·:-_.:::· Delta·:: -::-:.. ·· .,. ···· ·· · . :: ·: ...... ..· ••· ,_.. :_ ......: .-:::.·-: ::.- -:-.·· ..... :-: ·--.. ...... :-- ·_ ..·. :-:-:_..- ·.: ·:··- :" : . ·.. _-' .-_. .-._.:-: _._· : ._.-_: ::- _: _: __::·: . :·.. :.-_:.·_ ·. ·.. - ::·/ .. -.·· :·- ·. .... ' . We observed a CIBW birth on July 20, 2015 in the Susitna River Delta, . :··. .·:: . ::·.:··:- .... • .·: ·.···.-... ... ..-.·:. ....... •• seasons exist for endangered Cook Inlet beluga whales (CIBW), as they do with other ...,- ... -.-.-·. .. ..·. KnikArm ·:·-···.·.· . ' .- :_::_·.·,.·. ·.·, ..•_. .:·-. -:· :, ·. -. '• .. : ... -.-;-· .. .. ··-:::-· ._._. ...... -.·: ..... ·.. ·.-·.::-. Upper Cook Inlet Alaska. beluga populations. Specific calving grounds or seasonal calving periods for CIBW . .. have not been designated because births in the wild have not been previously _'-_: :'": .-·.-·.:.:,:,- • The birth took place during low tide, in shallow waters (~1.3m) . ·.-·:·_~/-::_~;·:::·/' ... .· documented. .._)_ ~.:.~_:. __ ~.:_} ._\:·_=:_-:_::::_::":::\( '.-/:. ·=: : : :·._ . along the exposed mudflats, 5-10 m from shore. This was a cove- -·---··-· ··- .. :: :, : : _. ·.'- . : : : _. .. _. .... ·_ :· :":":·:": ·_. .: . like area where the current was reduced relative to nearby areas. .:··"::\:.:\·: ::i.: i::.=:-:::=-1\.: ::::::.:::-::::::::::\·~ ::::::._//.: _: __ 151 "30'0"W 150"0'0"W .-.-.··-··-· .... -.-.-:·.-. b ·.·.... ·_:·_.::-.- :.: ":: :·:_.·_.:-.-.·.·, z b Methods 0 .· • The birth occurred in a larger group of 313 whales, with at least b "'~ .- Map extent b "' "'0 ~ Cook Inlet Beluga Whale Photo- Little Turnagain Arm D three other neonates seen in the group. "' Susitna 0 4 8 Kilometers Alaska Susitna Kena i River Identification Project I I I Pen insu la cr ~(~nl Beluga River I I I • Little of the birth event was visible at the surface and the turbid • Upper Cook Inlet 2005-2015 I I ·. 0 3 6 Miles Susitna River Delta z . : : .- •. ·. ·: : . : waters did not permit us to see underwater. b b • Kenai River Delta 2011-2013 z Upper 0 • ~ b Cook Inlet b "' 0 • An adult beluga was noted to be a few meters away from the main ~ • ~250 boat- and land-based "' photo-id surveys group. The group was traveling along the exposed edge of the West Foreland East Foreland • Conducted under NMFS permit mudflats, but the lone beluga was floating log-like at the surface. It ......._ Salamatof Site Kenai #18016 was eventually joined by other belugas, and a neonate with deep z .'f'ir_,- River b Kalgin 0 15 30 Kilometers b Island "----._: / Kasilof Mouth I I • Ice-free season. "'0 lower fetal folds surfaced explosively from alongside the lone beluga. ~ Cook Inlet /4a5ilof River 0 15 30 Miles • Note group size, location, 1s1 ° 30'0"W 150"' 0'0"W • During the 37-minute observation period, the neonate was often behavior, and color/ age-class seen listing to one side at the surface and appeared motionless, but Neonates (newborns, hours to days then was pushed upright by other belugas. At times it would old) are distinguished from calves by disappear from view, but then later was seen being pushed forcefully their smaller size, darker color, to the surface by a small group of attending whales. sunken head, fetal folds, and • When last seen, the neonate appeared to be breathing and swimming uncoordinated “corky” on its own, but remained surrounded by a small group of belugas. surfacing/swimming behavior. Seasonal Patterns Neonates were seen over a 5-12 week period every field season, • In all instances, the first Geographic Patterns KmkArm Conclusion usually beginning in mid-July. neonates of the field season • Keeping in mind the Year Field season First Last # weeks from first Location of first were seen in the waters of Susitna River , . • Delta ). • • • • . -: • bounds of the study area neonate neonate to last neonate neonate sighting • • . •· ..._· . the Susitna River Delta • • • • -· .• ....~ ~ tfeP sighting sighting sightings of season of season • • •-. and study period, these (defined as between the • 2005* April 14-Oct 21 July 6 n/a n/a Susitna River Delta • • results provide evidence Beluga River and Little • • • • ..• ... to support the designation Susitna River). • Turnaga ;n Arm 8 Gp • 2006* May 12-Oct 5 n/a n/a n/a n/a • .. • •• of the Susitna River Delta Upper Cook Inlet Chfckaloon Bay 11• 2007* June 28-Oct 27 July 27 n/a n/a Susitna River Delta • as CIBW calving grounds, As each field season 2008 May 21-Oct 28 July 24 Sep 30 9 Susitna River Delta the nearshore areas of progressed, neonates were 2009 June 19-Oct 24 Aug 1 Oct 15 9 Susitna River Delta Upper Cook Inlet as seen in all other survey areas 2010 May 9-Oct 15 July 16 Oct 8 12 Susitna River Delta nursery grounds, and mid- 2011 April 16-Oct 22 July 27 Sep 27 9 Susitna River Delta where belugas were Alaska Cook Inlet Beluga surveys July through mid-October M.ap eYtent encountered (Susitna River • 2005-2015 D Kenai River 0 5 10 Kilometers Neonate present in group as the peak calving period Delta 'i • Yes LGL Delta, Knik Arm, Turnagain • 0 4 8 2012 May 2-Oct 21 July 20 Oct 4 11 Susitna River Delta Miles • No J1mua1y 20 16 in Upper Cook Inlet. Arm, Chickaloon Bay, and the 2013 April 20-Sep 21 July 31 Sep 3 5 Susitna River Delta Locations of beluga groups seen with and without neonates, Kenai River). 2005-2015. Groups with belugas of unknown age-class (due to 2014 July 8-Oct 3 July 21 Oct 3 10.5** Susitna River Delta poor sighting conditions) are not shown. 2015 May 28-Oct 1 July 19 Oct 1 10.5** Susitna River Delta *neonates were not differentiated from calves during the 2005-2007 surveys, but neonates were noted if visible in photos Thanks to Ken Matthews and Lauren Bisson of LGL for GIS support. ** last day of field season Alaska Research Associates, Inc. .
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