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SEMINAR: MBF602 STUDENT SEMINAR FRIDAY 9/7 @ 1PM---SEAN BIGNAMI

From: Pam Harris <pharris@rsmas.miami.edu>
Subject: SEMINAR: MBF602 STUDENT SEMINAR FRIDAY 9/7 @ 1PM---SEAN BIGNAMI
Date: Wed, 5 Sep 2012 13:00:08 -0400

 

MBF Student Seminar Series

 

 

Sean Bignami

Advisors: Su Sponaugle & Robert Cowen

 

“Effects of ocean acidification, increased temperature,

and starvation on larvae of a subtropical fish”

 

Currently, ocean acidification (OA) is occurring faster than at any time in the last 300 million years. There is a critical need to understand the effects of acidification on the vulnerable larval stages of harvested marine fishes, as there is potential for large impacts on fish populations and the human economies that rely on them. My previous work with larval Rachycentron canadum (cobia), raised through the first three weeks of ontogeny, demonstrated their resistance to OA scenarios predicted for the next several centuries, with growth and developmental delays under more extreme treatments. However, when OA treatments were combined with starvation stress, or increased temperature, larvae demonstrated impacts not apparent under OA conditions alone. Reduced ration and OA had little effect on the size, development, or behavior of larvae, but larvae under OA conditions had significantly shorter time to 50 % starvation mortality than control larvae. When raised under OA conditions at 27 and 32 °C, cobia were smaller-at-age and developmentally delayed relative to control larvae, with a positive effect of warm temperatures on growth. Overall, cobia exhibit some resistance to OA, but this resistance may be limited when challenged with other aspects of climate change, such as increased temperatures or altered productivity.

 

 

 

 

 

FRIDAY, SEPTEMBER 7, 2012

1:00pm

RSMAS campus, S/A 103


Pamela Harris

Administrative Assistant

Marine Biology and Fisheries

Rosenstiel School of Marine & Atmospheric Science

University of Miami

4600 Rickenbacker Causeway/SLAB-118

Miami, FL 33149

(305) 421-4176

fax - (305) 421-4600

pharris@rsmas.miami.edu   

 

http://www.rsmas.miami.edu/academics/divisions/marine-biology-fisheries/