Only the good die young: bottom water hypoxia as a mortality source for copepod eggs and nauplii in Chesapeake Bay Michael Roman, David Elliot and Jamie.

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Presentation transcript:

Only the good die young: bottom water hypoxia as a mortality source for copepod eggs and nauplii in Chesapeake Bay Michael Roman, David Elliot and Jamie Pierson Horn Point Laboratory, University of Maryland Center for Environmental Science, PO Box 775, Cambridge, MD USA

Survival and egg hatching success is affected by low DO Roman et al DO (mg L -2 )

Question: Are hypoxic bottom waters a source of mortality for copepod eggs: Data: 1. # of eggs produced in surface waters 2. Sinking rate of eggs 3. Development rate of eggs as a function of temperature and oxygen 4. Vertical distribution of eggs, nauplii and copepodites

Depth (m) May 2010 Normoxic/South Station 5/27/10 07:005/27/10 10:00 5/27/10 13:005/27/10 16:00 5/27/10 19:00 5/27/10 22:00 5/28/10 01:005/28/10 03:30 0 m Scale is 0 – 250 individuals per Liter

May 2010 Hypoxic Station Scale individuals per liter Depth (m) 5/30/10 2:00 5/30/10 05:00 5/30/10 08:00 5/30/10 11:00 5/30/10 14:00 5/30/10 17:00 5/30/10 20:00 5/30/10 23:00 0 m

August 2010 Normoxic Station Scale individuals per liter 8/21/10 08:00 8/21/10 12:00 8/21/10 16:00 8/21/10 21:00 8/22/10 01:008/22/10 04:00 0 m Depth (m)

August 2010 Hypoxic Station Depth (m) Scale individuals per liter 8/23/10 21:00 8/24/10 02:008/24/10 07:00 8/24/10 12:00 8/24/10 17:00 0 m

North Station – 8/10 South Station-8/10