San Francisco Bay’s Cetacean Restoration · 2019-03-11 · • seasonal enlargement of testes •...
Transcript of San Francisco Bay’s Cetacean Restoration · 2019-03-11 · • seasonal enlargement of testes •...
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Bill Keener & Tim MarkowitzGolden Gate Cetacean Research
UCMPMarch 2, 2019
Tales of Urban Whales
San Francisco Bay’sCetacean Restoration
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Armando VeveSci AmericanSept 2018
UrbanEvolution
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Harbor Porpoise(Phocoena phocoena)
length: 1.5 - 2 m weight: 50 - 70 kgavg. lifespan: 10 - 11 yrmales smaller than females
Courtesy of Uko Gorter
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Porpoises & Dolphins
Porpoises: small, often appears dark triangular dorsal finsno ‘beak’blunt teeth
(“porpoise” from Latin for “pig fish”)
Dolphins: larger, often appears graycurved dorsal finbeak (‘bottle-nose’)pointed conical teeth
(“dolphin” from Greek)
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Harbor porpoiseshave re-occupiedSan Francisco Bay
They returned in 2008 after an absence of 60+ years
• cleaner bay environment• oceanic regime shift
Bill Keener / Golden Gate Cetacean Research
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Emeryville Shellmound: 400 to 2700 BP
1924
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Dr. Seth B. BensonU.C. BerkeleyMuseum of VertebrateZoology
June 14, 1939
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fromArtilleryattheGoldenGatebyBrianChin
WorldWarIIHarborDefenses
from Brian Chin, Artillery at the Golden Gate, 1994, Pictorial Histories Publishing Co. Inc.
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Submarine and torpedo nets1941-1945
courtesy Belvedere-Tiburon Landmark Society
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The Reber Planto dam and fill the bay
FRESH WATERLAKE
FRESH WATERLAKE
SUBMARINEBASE
Bancroft LibraryUC Berkeley
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• Three women:
– Catherine Kerr
– Esther Gulick
– Sylvia McLaughlin
• Grassroots effort—the first of its kind in the nation—changed the fate of the Bay
Why Do We Still Have A San Francisco Bay?
courtesy of Save the Bay
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Study Platform: Golden Gate Bridgepedestrian walkway70 m above sea level
Key Results:§ 176 surveys over 4 years
§ Porpoises sighted on 100% of surveys at high tide
§ 10% calves
§ 34 porpoises/survey
Stern et al., 2017Aquatic Mammals, 43(6)
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Key Results:
§ Porpoises sighted on 100% of surveysat high tide
§ 10% Calves
§ 34.4 +/- 29.2 porpoises/survey
2011 2012 2013 2014 2015
050
100
150
DATE
SPUE
Porp
oise
C
ount
High count = 175February 20, 2012
Stern et al., 2017Aquatic Mammals, 43(6)
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Longest time spanbetween sightings:5 years
Photo-ID Effort
Bill Keener / Golden Gate Cetacean Research
Bill Keener / Golden Gate Cetacean Research
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PigmentationWhite Porpoise“Mini-Moby”
2011 – 2013
Keener et. al, 2011. JMATE
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Spinal Deformity
SFB 224 “Scoliosis”
12 sightings
Bill Keener / Golden Gate Cetacean Research
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Foraging
Bill Keener / Golden Gate Cetacean Research
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Reproduction
Gestation: 10.5 monthsBorn in summerIBI: every other year?
Marc Webber / Golden Gate Cetacean Research
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2010
Mating Behavior -- first observation
Bill Keener / Golden Gate Cetacean Research
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Keener et al. 2018. Aquatic Mammals, 44(6)
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male
femalecalf
2
Mating Behavior
Keener et al. 2018. Aquatic Mammals, 44(6)
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Research Background:
Harbor porpoises are characterized by:
• short life span (~10-12 years)
• synchronized seasonal breeding
• sexual dimorphism: males average ~10% smaller than females
• seasonal enlargement of testes
• relatively large penis (~0.5 m) for a small odontocete
• promiscuity (multiple mates)
• probable sperm competition
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0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Left Behind Under Right
ContactAttempt Non-contactAttempt Display
N=34videos
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Left Behind Under Right
N=142videos/photos100%
LateralityinSexualApproach
PositionofMaleRelativetoFemaleatInitialApproach PositionofMaleRelativetoFemaleatClosest
PointofApproach
%ofA
pproache
s
41%
9%
18%
32%
Keeneretal.2018.AquaticMammals,44(6)
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142 mating events photographed:
in 100% male approachesfemale on her left side
Keener et al. 2018. Aquatic Mammals, 44(6)
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Exclusive Left Side Mating Contact:Unique Among Mammals?
1. Male Asymmetry
• Brain hemisphere, biosonar• Skeletal: flippers, pelvic bones • Reproductive organ
2. Female Asymmetry
• Reproductive tract
3. Co-evolution of Behavior/Anatomy
Hypotheses:
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San Francisco
Marin County
AngelIsland
Porpoise density increasesin the Golden Gate
“The Funnel of Love”
San Francisco
Marin County
AngelIsland
Porpoise density increasesin the Golden Gate
“The Funnel of Love”
Marin
San Francisco
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Bottlenose Dolphin(Tursiops truncatus)
length: 2 – 3.5 m weight: 150-250 kgavg. lifespan: 40-50 yr
Courtesy of Uko Gorter
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Bottlenose Dolphins in San Francisco Bay
Bill Keener / Golden Gate Cetacean Research
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California
0 100 20050 MilesSan Diego
Los Angeles
Monterey Bay
San Francisco
Mendocino
?NorthwardrangeexpansionfromSoCalsince1983
Adapted from NOAA Stock Assessment Report
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“Gumpy”Rodeo Beach, Marin Co.
Unique fin profiles
Photo-ID
Bill Keener / Golden Gate Cetacean Research
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GGCR Catalog = 97 Adults
SFB T 25
Bill Keener / Golden Gate Cetacean Research
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Feeding on salmon
New Opportunities: a change in the SF Bay food web
Bill Keener / Golden Gate Cetacean Research
Bill Keener / Golden Gate Cetacean Research
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Calf with fetal folds
Mothers & Calves
Bill Keener / Golden Gate Cetacean Research
Bill Keener / Golden Gate Cetacean Research
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Dolphin/PorpoiseInteractions
From Cotter et al., Porpicide in California. 2011. Marine Mammals Science: 28(1)
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SF Bay’s Resident Dolphin: Kaimi
Solitary Dolphin
off Alameda in the East Bay
Bill Keener / Golden Gate Cetacean Research
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Uko Gorter
HumpbackWhale(Megapteranovaeangliae)
length:45- 50ftlifespan:50+yrdiet:fishorkrill
Courtesy Uko Gorter
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Last Whaling in the US: Richmond Station (closed 1971)Courtesy KQED Quest
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2016
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Bill Keener / Golden Gate Cetacean Research
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From the Golden Gate Bridge
Bill Keener / Golden Gate Cetacean Research
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Bill Keener / Golden Gate Cetacean Research
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Research Questions:
1. What is their habitat in SF Bay?
2. How many humpbacks & who?
3. What attracts them to SF Bay?
4. Why now?
5. Where do they come from (breed)?
6. Conservation & risks?
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Strait
BayAlcatrazI.
What is their habitat?SF Bay Humpback whale sighting areas
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How Many Whales and Who?
SF Bay Whale Photo ID Catalog: 65 individuals
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Unconventional Marks
SF Whale Tours GGCR Research Boat
Repeat Visits in Different Years
2016 2017 GGCR GG BridgeGGCR GG Bridge
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Tracking Whales across the Pacific Mother & calf
Joey Meuleman / San Francisco Whale Tours
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Monterey Bay2009 - 2017
female CRC-12420 & calf 3½ months
SF Bay11 June 2018
Happywhale.com
1550 miles(2500 km)
Where Do They Breed?
Puerto Vallarta27 Feb 2018
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Lunge Feeding
What Attracts the Whales to SF Bay?
Bill Keener / Golden Gate Cetacean Research
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Why Now?
1966: Whaling moratorium
1978: 1,400 (North Pacific)
1991: 10,000
2007: SPLASH Study = 20,000
2018: Approx. 22,000 and Increasing
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NOAA2016
HawaiiMexico
(about 3,000)CentralAmerica(about 400)
Threatened and Endangered Populations
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Conservation & Risks:potential for ship strikes
Joey Meuleman / San Francisco Whale Tours 2018
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Theodolite tracking -- Lindsay Young, SFSU
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Desalination Plant Marc L’Italien SeaGen Tidal Power Installation
The Future ?
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Humpbacks in SF Baysave the planet in the 23rd Century!
poster courtesy Matt Ferguson
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Thanks to:• Cascadia Research
Collective • San Francisco Whale
Tours • The Marine Mammal
Center• National Wildlife
Federation• American Cetacean
Society, SF Bay• Cal Academy of
Sciences• SFSU Estuary & Ocean
Science Center • Greater Farallones Nat.
Marine Sanctuary• Oceanic Society• Golden Gate Raptor
Observatory
Activities Authorized by NOAA Fisheries permits# 20386 and 21678
Questions?
Bill Keener / Golden Gate Cetacean Research