View
215
Download
2
Category
Preview:
Citation preview
DosidicusDosidicusgigasgigas: :
northernnorthernrange range
expansion expansion eventsevents
Emma M.C.Emma M.C.Hatfield Hatfield
&&F.G. F.G.
HochbergHochberg
DosidicusDosidicusgigasgigas
DistributionDistributionin thein the
Eastern Eastern PacificPacificOceanOcean
20ºC
20ºC
59ºN
??ºS
??
YEAR(s) STATE LOCALITY N Lat1862 CALIFORNIA Santa Cruz Island
Santa Rosa IslandSan Pedro
Santa Catalina IslandMonterey BayMonterey Bay
La JollaGoleta
Santa BarbaraEureka
NewportYakutat
34º00’1889 CALIFORNIA “1894 CALIFORNIA 33º40’1899 CALIFORNIA 33º20’
1908-10 CALIFORNIA 36º50’1934-37 CALIFORNIA “
1956 CALIFORNIA 32º50’1974-76 CALIFORNIA 34º20’1982-83 CALIFORNIA “1990-91 CALIFORNIA 40º45’1997-99 OREGON 44º40’2002-06 ALASKA 59º30’
Northernmost Confirmed Range Extensions
62626289949902-0697-99
34-3656
90-9108-10
74-7682-83
1800s2000s 1900s
●●
Monterey
Newport
Yakutat
Los Angeles
OREGON
CALIFORNIA
CANADA
WASHINGTON
MEXICO
Northern Range Extensions
60º
40º
20º
COLLECTIONS SURVEYEDCOLLECTIONS SURVEYEDCaliforniaCalifornia
–– CabrilloCabrillo Marine Aquarium, San PedroMarine Aquarium, San Pedro–– California Academy of Sciences, San FranciscoCalifornia Academy of Sciences, San Francisco–– Hopkins Marine Station, Pacific GroveHopkins Marine Station, Pacific Grove–– Moss Landing Marine Laboratory (SBMNH)Moss Landing Marine Laboratory (SBMNH)–– Museum of Natural History, Los AngelesMuseum of Natural History, Los Angeles–– Museum of Natural History, Pacific GroveMuseum of Natural History, Pacific Grove–– Museum of Natural History, San DiegoMuseum of Natural History, San Diego–– Museum of Natural History, Santa BarbaraMuseum of Natural History, Santa Barbara–– Scripps Institute of Oceanography, La Jolla Scripps Institute of Oceanography, La Jolla
OregonOregon–– Oregon State University, Corvallis (SBMNH)Oregon State University, Corvallis (SBMNH)–– Oregon Coast Aquarium, Newport (SBMNH)Oregon Coast Aquarium, Newport (SBMNH)
OtherOther–– National Museum of Natural History, Washington, DCNational Museum of Natural History, Washington, DC
1908: San FranciscoCalifornia
Academy of Sciences
1935: Monterey
Ed Ricketts
Museum ofNatural HistoryPacific Grove
1974: Santa Barbara
Museum of Natural HistorySanta Barbara
immaturemature
100 200 300 400 500 600 700
0
5000
10000
ML (mm)
Mas
s (g
)
pExamination of museum specimens
1908
19351974
19 June 19 June
28 August
25 July
2002 Strandings
June 2002 MEXICO: La Paz
July 2002CALIFORNIA:
La Jolla Cove
August 2002
CALIFORNIA: Goleta & Santa Barbara beaches
September September –– October 2004October 2004ALASKA: off Yakutat (Gulf of Alaska)ALASKA: off Yakutat (Gulf of Alaska)CANADA: off CANADA: off SwiftsureSwiftsure Bank (Vancouver Island)Bank (Vancouver Island)WASHINGTON: off Westport OREGON: off NewportWASHINGTON: off Westport OREGON: off Newport
January 2005January 2005
CALIFORNIA: Pt. Sal, Newport Beach,CALIFORNIA: Pt. Sal, Newport Beach,Monterey & Half Moon BayMonterey & Half Moon Bay
Measurements of fresh specimens obtained during northern range expansions events
0
2000
4000
6000
8000
10000
12000
0 100 200 300 400 500 600 700 800
Dorsal Mantle Length (mm)
Bod
y m
ass
(g)
July 2002
Jan 2005
■ 1976 SoCalif ■ 2002 SoCalif ● 2003 Oregon ▲ 2004 Canada■ 1999 SoCalif ■ 2005 SoCalif ● 2004 Oregon ▲ 2005 Alaska
Recreational & Commercial Landings
0
5000
10000
15000
20000
25000
30000
35000
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Nos
land
ed
The North San Francisco Monterey Los Angeles San Diego
Recreational Catches87,880 164,534Recreational
Dosidicus: California Landings – 1990 to 2005
0
25
50
75
100
125
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
land
ings
(t)
150
Th N th S F i M t L A l S Di
334 t Commercial334 t
Tons
Num
bers
Dosidicus landings (t)
0
50
100
150
200
250
300
350
400
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Com
mer
cial
land
ings
(t)
Loligo landings (t)
0
25000
50000
75000
100000
125000
150000
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Com
mer
cial
land
ings
(t)
Commercial Squid Landings: 1990-2005
Dosidicus gigas
Doryteuthis opalescens
Dosidicus commercial landings by gear: 1990 to 2005
0
50
100
150
200
250
300
350
Gillnet Hook-and-line gears
Other Seine Trap Trawl Unclass.
Land
ings
(t)
Loligo commercial landings by gear: 1990 to 2005
0
250000
500000
750000
1000000
Gillnet Hook-and-linegears
Other Seine Trap Traw l Unclass.
Land
ings
(t)
Commercial Landings by Gear Type: 1990-2005
Doryteuthis opalescens
Dosidicus gigas
0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
Mex
ican
Pac
ific
land
ings
(t)
BAJA CALIFORNIA BAJA CALIFORNIA SUR SONORA SINALOA
0
25
50
75
100
125
150
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
land
ings
(t)
The North San Francisco Monterey Los Angeles San Diego
334 t California
Comparison of Commercial Landings: 1991-2003To
ns
334
Mexico
Tons
What triggers migration of What triggers migration of DosidicusDosidicus intointonorthern waters?northern waters?normal part of range?normal part of range?population explosion at center of rangepopulation explosion at center of rangenorthern migration of core populationnorthern migration of core populationcorrelations with oceanographic events (ENSO)correlations with oceanographic events (ENSO)tropical depressionstropical depressionsglobal warmingglobal warmingfollowing prey northfollowing prey north
Do populations reside andDo populations reside and reproduce reproduce in far northern waters?in far northern waters?
TOPICS FOR DISCUSSIONTOPICS FOR DISCUSSION
What contributes to mortality and What contributes to mortality and strandingsstrandings??Natural causesNatural causes
postpost--spawning mortality (spent & dying)spawning mortality (spent & dying)chasing grunion onto beaches chasing grunion onto beaches driven ashore by predators driven ashore by predators parasites, pathogens &/or diseasesparasites, pathogens &/or diseaseschanges in water temperature (cold shock)changes in water temperature (cold shock)changes in salinity (freshwater influx from heavy rains)changes in salinity (freshwater influx from heavy rains)changes in sediment load (increased turbidity in near changes in sediment load (increased turbidity in near
shore waters)shore waters)starvationstarvationnatural chemical toxins (natural chemical toxins (domoicdomoic acid)acid)
Other causes of mortalityOther causes of mortalitymanmade pollution, manmade pollution, biotoxinsbiotoxins, or antibiotics, or antibioticssonic pressure waves (secret naval maneuvers)sonic pressure waves (secret naval maneuvers)swarms of mini earthquakesswarms of mini earthquakesdistance impacts from SE Asian earthquakes & distance impacts from SE Asian earthquakes &
tsunamistsunamismass suicides during aerial attacks on coastal mass suicides during aerial attacks on coastal
cities in California cities in California
Acknowledgements:
To date 38 people have assisted our project
Collection of animals & sighting/stranding records Access to specimens, specimen data, &/or photographs Assistance with specimen measurements Access to oceanographic informationAccess to commercial and recreational fishing records
MEXICO: Baja CaliforniaUSA: California, Oregon, Washington, AlaskaCANADA: British Columbia
Media contacts & archives
Recommended