Seminars

March 9 2014

5:00 pm BSRB 154

EcoEvoPub Series

Graduate Student Presentations

Summary

BRENTON SPIRES\
\ Department of Ecology and Evolutionary Biology\
\ UCLA\
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\ Effects Of Temperature and Latitude on Larval Traits of Two Estuarine Fishes in Differing Estuary Types\
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\ Variations in abiotic conditions across large latitudinal gradients have been found to strongly influence the early life history of marine organisms. This study investigates the effects of temperature and latitudinal on the larval traits of two native estuarine fish species. The arrow goby \(Clevelandia ios\) and the federally endangered tidewater goby \(Eucyclogobius newberryi\) were studied in 18 estuaries along the coast of California, spanning approximately 8 degrees of latitude. These two species were selected because of their dissimilar preference for estuary type: the arrow goby prefers cooler, fully tidal bays and mudflats, whereas the tidewater goby prefers warmer estuaries and lagoons that experience some degree of seasonal closure, or isolation, from the sea. Recently settled individuals were collected from July-October 2011 and temperatures within each estuary were recorded hourly in order to determine how temperature variations affect larval duration, settlement, and growth rates. Temperatures were more variable among sites for estuaries inhabited by the tidewater goby \(10o C range\) than for those inhabited by the arrow goby \(5o C range\). Larval traits of both species varied significantly among sites, but among site variation was greater for the tidewater goby, a difference that was tied to the greater differences in temperatures among sites in the seasonally closed estuaries it inhabited. On average, for both species, fish that experienced warmer temperatures had a shorter larval duration, faster growth rates, and were smaller at settlement. Since the length of the larval period has been related to dispersal distance for some species, and survival in others, future variations in temperature due to climate change could have a direct and predictable influence on population connectivity and community interactions of estuarine associated species.\
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\ GRACE JOHN\
\ Department of Ecology and Evolutionary Biology\
\ UCLA\
\ \
\ TBA\
\ THURSDAY, APRIL 10, 2014\
\ 5PM IN 154 BIOMEDICAL SCIENCES RESEARCH BLDG\
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this is idtest: