Transcript Climate-driven Changes in Abundance and Distribution of Larvae of

GROUP MEETING
2010/04/13 R98229014 Kirsten Feng
CLIMATE-DRIVEN CHANGES IN
ABUNDANCE AND DISTRIBUTION OF
LARVAE OF OCEANIC FISHES IN THE
SOUTHERN CALIFORNIA REGION
CHIH-HAO HSIEH, HEY JIN KIM, WILLIAM WATSON,
EMANUELE DI LORENZO and GEORGE SUGIHARA
Motivation
 For fishes, climate change has significant
influences on their abundances and distributions
by affecting their survival, growth, reproduction,
and migration, or through their responses to
changes in food supply.
 Although El Nino effects on species composition
were noted, long-term variability of abundances
of selected species were examined, and decadal
changes in distributions of oceanic fishes were
illustrated in atlases, no systematic study has
been carried out to examine these changes.
Dataset and comparison
 Both fish data and SST data are from CalCOFI
 Comparison:
 Fish data
 PDO
 SOI
 NPGO
 NPI
Conclusion
 Climate change has had significant effects on the
abundances of oceanic fishes, and to a lesser
extent on their geographic distributions.
 Nevertheless, we found that ecologic traits
(mesopelagic vs. vertical-migrating) played an
important role in determining the sensitivity of
fish in response to climate variations.
 Apparently, climate change has effects on not
only population but also ecosystem level
properties.
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