Bangarang 2015: Leg 3 Report - WordPress.com · Bangarang 2015: Leg 3 Report Eric Keen, Will Bostwick, Sam Watson & Emily Ezell August 3, 2015 A stranded transient killer whale. Details

Bangarang 2015: Leg 3 Report

Eric Keen, Will Bostwick,Sam Watson & Emily Ezell

August 3, 2015

A stranded transient killer whale. Details of stranding and response inside.

Highlights

- Third circuit of visual/acoustic surveys complete.- Local research community rescues stranded transient killer whale.- Dramatic shifts in fjord system’s geography of schooling prey.- Humpback whales have already moved into inner fjord channels.- All ”regular” seabird species are now in the area.- Escalating fin whale numbers.

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Bangarang 2015 Leg 3 Summary 07 - 11 to 07 - 31

Summary

Leg 3 of the Bangarang Project 1 was full of surprises – another successful chapter in the project’s final field sea-son. This brief leg consisted of visual and acoustic transect surveys only – oceanographic stations were not vis-ited.

This project’s mission is to investigate the oceanographic mechanisms of habitat use by marine mammals,seabirds and other mobile marine predators within this complex fjord system. On a typical Bangarang day, ourthree-person team conducts visual surveys for whales and seabirds while our echosounder maps swarms of preybelow using high-frequency acoustics. These transects are punctuated by visits to a grid of oceanographic sta-tions, at which we cast our zooplankton net and a CTD (which measures properties like temperature, salinity,oxygen, chlorophyll and pH) down to the seafloor. When we see whales, we approach them for photo-identificationand behavioral focal follows.

OceanographyThe fjord system was windy and wet. Early days of the circuit were dealt gale-force northwesterlies, which

then shifted to waves of southeast wind and rain. Surface waters cooled slightly to 11-18 deg. C., with no clearinshore-offshore gradient. Hotspots included Caamano Sound, north Squally and Ursula Channel. Coldspotswere Campania Sound, Estevan Sound and south Squally. Surface waters were generally more saline (up to 32psu in Estevan and Caamano) but an inshore-offshore gradient remained. North Verney still holds the freshestsurface waters.

Zooplankton and FishEchosounder transects showed that krill patches became scarce in the study area, observed at relatively low

densities only in south Verney Pass, McKay Reach, Wright Sound (consistent with the onshore prey wave we’veobserved in previous legs) and south Squally. Jelly abundance seemed to drop dramatically but hotspots per-sisted in north Squally and Caamano Sound. Jelly diversity increased as well: water jellies and fried egg jelliesbecame very common amongs the Lion’s manes and moon jellies. Echograms also revealed that fish schools haveproliferated in south Estevan, north Campania, southern Whale Channel and north Verney Pass. In relativelyshallow areas (north Verney and Estevan Sound), these fish schools were hovering just above the seafloor. Sur-face swarms of sand lance were observed along the western shore of Campania Island, and large schools of frywere seen in small coves such as Taylor Bight and Barnard Harbor. The Estevan fish schools were likely herring,as we observed humpbacks bubble net feeding and obtained pictures of the fish in their mouths. Salmon wereobserved throughout the study area both on the echosounder and at the surface far more often than in previouslegs. A sunfish (Mola mola) was seen in Caamano Sound!

SeabirdsThe seabird community is almost full-fledged: all the “regulars” (except cormorants, oddly) are now in town.

Red-necked phalaropes assumed their usual position as the most abundance species. Cassin’s auklets are veryabundant in Estevan but have not yet been seen in other channels. Marbled murrelets remain common, and non-breeding plumages are starting to come into fashion. Another ancient murrelet was seen in Estevan, but themost exciting sighting goes to the numerous fork-tailed storm petrels now at work in Squally Channel. Bona-parte’s gulls have become more common in protected harbors, but black-legged kittiwakes have become morescarce.

Marine mammalsDall’s porpoises sightings dropped this circuit, and no other small odontocete species were seen. In this leg we

collected 77 whale IDs and executed 40 focal follows. Our annual humpback catalog is now in the triple digits.Humpback whales have already shifted into the inland channels of Verney and McKay and are otherwise concen-trated in Wright Sound, south Squally, and Campania. A large bubble-net feeding group is still at work in Este-van Sound, though membership seems to have shifted slightly since our June encounter. Mother-calf pairs are in-creasingly common. Fin whale presence has increased, and they seem to be targeting the isolated krill patches insouth and central Squally. Northern resident, Bigg’s, and even offshore (reported from Hartley Bay) killer whaleswere present in the fjord system during this leg. One Bigg’s killer whale (T069A2) stranded itself during a har-bour seal hunt, and the community response to the crisis was phenomenal (a special section in this report detailsthe event from the Bangarang’s perspective.)

VesselsFishing pleasurecraft were common in the area, as were transiting commercial fishing vessels. On two occa-

1The Bangarang project is a collaborative oceanographic study in the marine territory of the Gitga’at First Nation (Kiti-mat Fjord System, British Columbia), representing the joint efforts of the Bangarang field team (PI: Eric Keen, [email protected],www.rvbangarang.wordpress.com), the Gitga’at First Nation, the North Coast Cetacean Society (www.forwhales.org), and the DFOCetacean Research Program.

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sions speeding recreational vessels nearly ran over cetaceans: one turning around Amy Pt (north tip of Gribbell)passed right through a group of orca; another in north Squally nearly struck a sleeping humpback.

BangarangThis leg marks the halfway point of the 2015 research season, and morale could not be higher. Despite an out-

break of DPS (Damp Pants Syndrome) during the July rains, costume and spirits persist out of sheer will. Theanchorages remain sacred, the fellowship incredible and the vessel cooperative. There’s no telling what Leg 4 willbring!

Table 1: Circuit summary.leg begin end # days eng.hrs rub.hrs rub.nm trans.nm per.plan daily.hrs daily.nm wiw.hrs

3 07-11 07-31 21 120 112 414.8 187 88% 5.33 19.8 14.6

bft per.cld wind.spd hw fw kw birds.spp birds.ind ctd secchi zoo1.4 90% 7.07 142 18 23 23 1717 0 0 0

3


−129.6 −129.4 −129.2 −129

52.8

5353

.253

.4

Longitude (°)

Latit

ude

(°)

All Effort, All Sightings

−129.6 −129.4 −129.2 −12952

.853

53.2

53.4

Longitude (°)

Latit

ude

(°)

Transects & Focal Follows

−129.6 −129.4 −129.2 −129

52.8

5353

.253

.4

Longitude (°)

Latit

ude

(°)

All Sightings

−129.6 −129.4 −129.2 −129

52.8

5353

.253

.4

Longitude (°)

Latit

ude

(°)

Stations

Figure 1: Legends below.

Vis & Ac Transect Ac Transect With Whales At Station Casual

●●

●●

●

● ● ● ● ● ●Debris Jelly Salmon Seabird Pinniped Cetacean

4


Tab

le2:

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ort

sum

mari

esfr

om

each

day

of

circ

uit

.date

circ

dos

blk

1blk

2dir

mode

obs1

obs2

obs3

eng.h

rs

eff.h

rs

eff.n

mtrans.n

m%

pla

nwiw

.hrs

photos

bft

cld

w.spd

w.d

irhw

fwkw

birds.spp

birds.ind

ctd

secchi

zoo

20150712

359

est

squ

SB

trn

em

kW

ILL

SAM

71

3.9

60

0%

0.1

03

99

1100%

10.5

21.2

40

00

00

00

20150713

360

squ

cm

pNB

full

em

kW

ILL

SAM

813

41.3

17

NA%

2.4

8963

285%

10.1

168

15

80

211

00

020150714

361

cm

pNB

full

em

kW

ILL

SAM

99

30.6

116

87%

0.4

11

125

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100%

7.0

3202

16

00

274

00

020150715

362

wha

wri

SB

full

em

kW

ILL

SAM

88

28.8

619

87%

0.3

64

151

1.5

70%

6.7

1163

13

00

217

00

020150717

364

sqnf

wri

SB

full

em

kEM

ILY

SAM

89

32.3

612

88%

0.2

97

20

0.7

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8128

20

03

220

00

020150718

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ver

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SAM

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8113

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3210

00

020150721

368

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full

em

kEM

ILY

SAM

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28.1

414

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0.8

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10.5

230

11

00

351

00

020150722

369

sqn

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NB

trn

em

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ILY

SAM

613

11.0

30

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1.9

92471

0.2

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2.8

6154

10

13

00

00

020150723

370

wri

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em

kEM

ILY

SAM

78

23.6

419

81%

0.6

25

749

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100%

8.6

4206

15

00

2107

00

020150725

372

est

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ILY

SAM

12

14

45.6

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8176

17

00

4727

00

020150726

373

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cm

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full

em

kEM

ILY

SAM

11

14

46.3

421

86%

1.7

32266

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6.0

7115

21

20

3159

00

020150727

374

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full

em

kEM

ILY

SAM

55

21.5

96

85%

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2100%

9.9

7132

70

02

21

00

020150729

376

nsq

cm

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full

em

kEM

ILY

SAM

10

12

45.4

113

76%

3991

0.3

485%

3.2

9145

48

03

120

00

020150730

377

cm

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fin

em

kEM

ILY

SAM

21

2.8

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00%

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58

133

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8.5

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20

00

00

00

20150731

378

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em

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ILY

54

13.6

80

NA%

0.3

56

145

1100%

7.2

5119

30

00

00

00

5


Tab

le3:

Pas

sive

acou

stic

reco

rdin

gs

n=

15,

ap

pro

x.

5hrs

50

min

.)duri

ng

this

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descrip

tio

nduratio

n.m

inreason

IDspp

grp

array

recorder

payout

rub.d

tX

Yblo

ck

26

3-4

fin

whale

sin

clu

dng

Tunix

deep

feedin

garound

the

boat

0:2

8:3

5W

IW4

FW

2K

IWI

OTHR

FUL

7/13/2015

11:2

2-1

29

53

SQ

U27

South

squally

statio

nrecordin

gwith

four

distant

fin

whale

sin

north

squally

and

many

hum

pbacks

inCam

pania

0:3

2:4

2STA

1K

IWI

PAM

GFUL

7/13/2015

13:5

2-1

29

53

SQ

U28

CentralCam

pania

recordin

gwith

distant

hum

pbacks

insig

ht

0:1

9:0

1STA

6K

IWI

OTHR

FUL

7/14/2015

9:2

3-1

29

53

CM

P29

Towed

array

recordin

gin

pursuit

oftransie

nt

kille

rwhale

swith

no

calls

detected

0:1

3:0

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IW2

KW

12

TOW

DPAM

G50m

7/22/2015

7:4

7-1

29

53

SQ

U30

Over-t

he-s

ide

recordin

gwhile

anchored

near

the

stranded

transie

nt

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rwhale

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12

SID

EPAM

GFUL

7/22/2015

8:5

5-1

29

53

SQ

U31

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he-s

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recordin

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st

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the

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from

the

rocks

0:4

3:2

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KW

12

SID

EPAM

GFUL

7/22/2015

8:5

5-1

29

53

SQ

U32

Driftin

gclo

seby

the

bubble

net

feedin

ggroup

–a

fantastic

recordin

g0:4

4:2

1W

IW2

HW

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TOW

DPAM

GO

TH

7/26/2015

7:1

7-1

29

53

CAA

33

North

Squally

statio

nrecordin

gwith

no

whale

sin

sig

ht

0:3

0:3

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12

KIW

IO

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FUL

7/29/2015

9:0

2-1

29

53

SQ

U34

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statio

nrecordin

gwith

four

fin

whale

sin

sig

ht

0:2

1:5

1STA

4K

IWI

OTHR

FUL

7/29/2015

12:2

5-1

29

53

SQ

U35

With

two

fin

whale

sin

sig

htin

g07

0:1

7:1

4W

IW7

FW

2K

IWI

OTHR

FUL

7/29/2015

13:3

5-1

29

53

SQ

U36

With

two

fin

whale

ssig

htin

g09

deep

feedin

gin

SCentralSqually

0:1

0:1

5W

IW9

FW

2K

IWI

OTHR

FUL

7/29/2015

16:0

6-1

29

53

SQ

U37

Statio

nrecordin

gin

south

Squally

with

adistant

pair

offin

whale

swithin

visualrange

estim

ated

4km

0:2

6:3

1STA

1K

IWI

OTHR

FUL

7/29/2015

16:4

6-1

29

53

SQ

U38

Taylo

rBig

ht

statio

nrecordin

gwith

no

whale

sin

visualrange

0:3

7:1

6STA

9K

IWI

OTHR

FUL

7/31/2015

10:5

3-1

29

53

CM

P

6


Top left: A female northern elephant seal recovering from a dive in south Squally.Top right: Local harbour seals often take advantage of floating logs as haul out refuges. Poor, delicious harbourseals.Mid left: Approaching rain in north Squally.Mid right: A large Mola mola in Caamano Sound.Top left: A glassy calm sunrise in Estevan.Bottom right: Steamed dungeness crabs from Cameron Cove holding up an oyster gifted to us by Bunker andNicole.

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Water Surface

−129.6 −129.2

5353

.253

.4

Longitude (°)

Latit

ude

(°)

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−

−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

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−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

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Tem

p. (

C)

T−S Plot

Figure 2: For the top row, cool colors are cold/fresh waters, warm colors are warm/saline waters. On the T-Splot (bottom left), readings are color-coded by block (key below). Euphotic depth (bottom right), an indicatoror water turbidity measured using a Secchi disc, is the depth at which light levels are 1% of what they are at thesurface. The T-S plot axes shows the value range for temperature and salinity maps. Surface temperature andsalinity are sampled at approx. 0.3m depth using a SBE45 Thermosalinograph. Here only data from the day’ssystematic transects and whale focal follows are displayed.

Verney McKay Wright Whale Squally Campania Estevan Caamano

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Echosounder Transects

Transects from survey blocks are arranged from inland (top) to offshore (bottom). Each block has twoechograms which show backscatter from sea surface to 300m depth from south (left) to north (right): the toplayer is 33 kHz (schooling fish) and the bottom is 200 kHz (krill and small zooplankton). Dark blue is empty

water, bright red is strong echo returns. Seafloor has not been removed.

Verney

Wright

Squally

Estevan

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Echosounder Transects

Transects from survey blocks are arranged from inland (top) to offshore (bottom). Each block has twoechograms which show backscatter from sea surface to 300m depth from south (left) to north (right): the toplayer is 33 kHz (schooling fish) and the bottom is 200 kHz (krill and small zooplankton). Dark blue is empty

water, bright red is strong echo returns. Seafloor has not been removed.

McKay

Whale

Campania

Caamano

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Echosounder Highlights

The top layer is 33 kHz (schooling fish and jellies) and the bottom is 200 kHz (krill and small zooplankton).Dark blue is empty water, bright red is strong echo returns. Seafloor has not been removed.

Casanave Bait Ball

Schools of forage fish hugging the seafloor of the sill in Casanave Passage (July 13). Humpbacks, rhinoceros auk-lets, marbled murrelets, Common murres and mew gulls were flocking at the surface.

Bubble net feeding group

The prey field during our focal follow of the bubble net feeding group in south Estevan, between Hickey Isletand McMicking Inlet (July 26). Discrete schools of herring spanning water column.

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Seabirds

Table 4: Seabird species (n=23) sighted during systematic sur-veys, sorted in descending order of individuals seen.

Species Total Seen Total Sightings Avg. Group # Flying # SittingRed-necked phalarope 697 80 8.7 45 34Marbled murrelet 409 166 2.5 69 95Common murre 202 69 2.9 15 54Mew gull 105 56 1.9 38 15Rhinocerus auklet 62 40 1.6 22 17Surf Scoter 41 4 10.2 4 0Cassin’s auklet 19 16 1.2 2 14Glaucous-winged gull 13 13 1.0 13 0White-winged scoter 9 4 2.2 4 0Common loon 7 6 1.2 5 1Western gull 6 1 6.0 0 0Harlequin duck 5 2 2.5 2 0Thayer’s gull 4 2 2.0 0 2Bald eagle 2 2 1.0 2 0Herring gull 2 2 1.0 2 0Ancient murrelet 2 2 1.0 0 2Fork-tailed storm petrel 2 2 1.0 2 0Black-legged kittiwake 1 1 1.0 1 0Red-throated loon 1 1 1.0 0 1Bonaparte’s gull 1 1 1.0 1 0California gull 1 1 1.0 0 1Pacific loon 1 1 1.0 1 0Pigeon guillemot 1 1 1.0 1 0

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Top left: Adult breeding mew gulls remain the most abundant larid in the area.Top right: A flock of glaucous-winged gulls, mew gulls, rhinoceros auklets and marbled murrelets feeding onsand lance at the entrance to McMicking Inlet.Mid left: A marbled murrelet takes a dive.Mid right: A red-throated loon taken by surprise.Bottom left: Male breeding red-necked phalaropes.Bottom right: Baxter the rufous hummingbird visits us in south Squally.

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Whales

−129.6 −129.4 −129.2 −129

5353

.253

.4

Longitude (°)

Latit

ude

(°)

Figure 3: All whale sightings from this leg. Point size is scaled according to group size. Blue = humpbackwhales. Red = fin whales. Green = killer whales. Purple = Dall’s porpoises. Sighting locations are correctedfrom vessel positions using bearing and reticle readings from observer platform.

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Top left: A humpback, in the frenzy of a bubble netting session, passed too close for comfort as the Bangarangdrifted nearby.Top right: A rare snapshot of a bow riding Dall’s porpoise.Mid left: The T69 Bigg’s killer whales at Edward Islets before the stranding.Mid right: Nicole, Hermann and Eric with the stranded killer whale. We took shifts keeping the whale wet andcold using soaked blankets, bedsheets and sarongs.Bottom left: Tunix remains the most commonly seen fin whale this season. This shot accentuates the lesions andectoparasite scars typical of regional fin whales.Bottom right: Bubble net feeding humpback whales.

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Killer whale stranding and response

22 July 2015. The Bangarang crew had just started transect work southbound in north Squally in the area ofUnion Pass. Emily saw the group of killer whales at approx. 07:30 traveling north along the Pitt Island shorefrom the area of Twartz Bay. Our first estimate was 11 animals, a leading subgroup of 5 followed by a subgroupof 6. We saw each group surface twice before a dive. They were moving quickly, so we set a course to interceptthe leading group while I deployed the towed hydrophone array.

When the leading group surfaced again they were much further ahead than anticipated; they may have spedup during their dive. They were now along the eastern shore of Hinton Island, the large island at the entranceto Union Pass. We never saw the trailing group surface again - they may have traveled to the west of Hinton orthey may have turned east toward Blossom Point on Farrant Island (a group of 6+ killer whales was seen in thatarea later in the day).

Even at maximum RPM (6.5 knots against an ebbing tide) we could not catch up to the leading group. Theysurfaced only twice before another dive, at which point they were approx. 500m south of Edward Islets. We hadchecked out these islets the week before and had counted approximately 30 harbour seals hauled out and amongthe kelp between the two islets.

When the 5 whales of the leading group surfaced again, they were between the two islets. At a distance wesaw some splash and spray, but could not tell whether these were successful chases. By the time we reached theislets the whales were circling the larger northern islet. Realizing that we would have to navigate shallows inorder to get IDs, I regretted deploying the array. On the western side of the islet we stalled to bring in the ar-ray (we had heard no vocalizations up to this point) then moved around to the eastern side, where we found thewhales pacing the shoreline and noticed that one was stationary very near dry rocks.

The whale, which we later named Black Bean, was nearly fully submerged except for its dorsal fin and thetrace of its anterior back. It was tucked between the islet and a boulder that was drying as the tide fell. Wewere surprised to see her so close to the rocks, but she did not appear to be in distress or trouble.

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We assumed it was a hunting tactic, an ambush for fleeing harbour seals. The other four whales were circlingthe islet. On two occasions we saw a pair of whales rush from the gap between the two islets around to the areawhere Black Bean was poised. The pair would rush past Black Bean then take a sharp turn right towards BlackBean’s mouth. This aligned with our guess that Black Bean was among the rocks intentionally. Other than thesetwo rushes, we did not see the other animals pay any special attention to Black Bean as they paced the shore-line.

We drifted back and forth for the next half hour, collecting IDs as we could. Occasionally Black Bean wouldadjust its weight, but its breathing seemed relaxed. We could hear no vocalizations out of the water. We grewconcerned when the right eye patch became exposed by the falling tide. Soon after this we began to see others inthe group linger around Black Bean as they circled the islet. We began considering the possibility that this wasa stranding, but did not act until we saw Black Bean raise its tail out of the water.

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I attempted to contact Whale Point, Hartley Bay and the Gitga’at Guardians over VHF but may have beenout of range. As I was coordinating a relay to Whale Point with Prince Rupert Coast Guard, we saw BlackBean pump its tail intermittently and began to hear it vocalize.

The Coast Guard confirmed that both Whale Point and the Sofia had received the message and that the Sofiawas en route. Marven Robinson of the GWs heard my conversation with the Coast Guard and let us know hewas on the way. We decided not to act further until the others arrived, so we anchored on the northwest slopeof the islet. We deployed a hydrophone over the side but heard no vocalizations. A light drizzle persisted dur-ing this wait, keeping Black Bean wet. The other four whales were now paying much more attention to theirstranded companion. They lingered close by until the other boats arrived.

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We pulled the hydrophone back up when Marven and company arrived in the Gitga’at Guardian and raftedup to us. Minutes later the Sofia arrived. By this time Black Bean was almost completely out of the water.

The group assessed the situation, Hermann consulted with Paul Catrell and a course of action was decidedupon: we would assess injury and keep the whale wet and cold until the higher high tide at 18:00, at which pointthe whale should be able to swim away without struggle.

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Hermann and Janie can provide a much better account of the remainder of the day. In summary, a small grouplanded on the islet with blankets, bed sheets and buckets. Injury to the animal seemed minor - abrasions on pec-torals and flukes, and the left pectoral was pinned against the rocks at an unnatural and possibly injurious an-gle. Hermann, Janie, George, Marven, Nicole, Bunker, and Eric were a part of the response team. The sheetswere laid over Black Bean and kept wet via buckets and a hand-powered water pump and hose system. Thiswork was kept up all day (about 6 hours) until the tide rose again to the whale’s waterline. Crew aboard theBangarang and Sofia made black bean burritos for the responders, hence the whale’s nickname.

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As the rising tide reached Black Bean’s flanks, a group of Hartley Bay school children arrived on scene withCam Hill to witness the stranding’s resolution. Eric returned to the Bangarang to deploy a hydrophone. BlackBean freed itself at about 16:30. The compiled recording’s first four minutes are excerpts of the whale’s vocal-izations just before it was freed. The whale freed itself at 04:03 in the recording and continued to vocalize in thearea for several more minutes. At 06:00 you can hear our cheers after Black Bean was re-sighted well away fromthe rocks.

We on the Bangarang felt so lucky to witness the teamwork among Cetacealab, the Gitga’at Guardians, theHartley Bay community, and the DFO Cetacean Research Program. We were honored to be involved.

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Top left: The Bangarang ’s new system of veggie scraps disposal.Top right: Team Bangarang.Mid left: Each observer’s handheld rangefinder is customized to their own height, arm length and aesthetic.Mid right: It don’t mean a thing if it ain’t got that swing.Top left: The observer team taking a much needed catnap in Caamano Sound.Bottom right: A cozy, rainy afternoon with Harry C. Otter and Melville.

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F R A S E R R.

Princess Royal Is.

Gil Is.

GribbellIs.

Hawksbury Is.

Pitt Is.

Campania Is.

P R I N C I P E CH.

E S T E V A N SD.

C A A M A N O SD.

H E C A T E S T R A I T

Aristazabal Is.

Otter Ch.

D O U G L A S C

H.

U R S U L A C

H.

G R E N V I L L E CH.

C A M P A N I A

SD.

Whale Pt.

Hartley Bay

Rennison Is.

Wall Islets

L O R E D O CH.

S u r f I n l e t

Bishop Bay

The study area

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A swarm of krill at 160m depth, photographed during a focal follow of feeding fin whales.

”You don’t think it be like it is, but it do” - E.C.E.

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Documents

Bangarang 2015: Leg 3 Report - WordPress.com · Bangarang 2015: Leg 3 Report Eric Keen, Will Bostwick, Sam Watson & Emily Ezell August 3, 2015 A stranded transient killer whale. Details