Effects of hypoxia on gelatinous zooplankton predation of copepods in the Chesapeake Bay Wen-Cheng Liu 1, Mary Beth Decker 2, James J. Pierson 1 1. Horn.

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Presentation transcript:

Effects of hypoxia on gelatinous zooplankton predation of copepods in the Chesapeake Bay Wen-Cheng Liu 1, Mary Beth Decker 2, James J. Pierson 1 1. Horn Point Laboratory, The University of Maryland Center for Environmental Science, Cambridge, MD 21613, United States. 2. Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT 06511, United States.

The scope of this study: To understand how hypoxia affect the relationship between gelatinous zooplankton and other zooplankton? Hypothesis : Copepods are preyed upon more heavily by jellyfish under hypoxic conditions.

Method  Cruise: 2010: May August September 2011: May July September  Stations: North (38° 31.32’ N, 076° 24.48’ W) South (37° 43.68’ N, 076° 12.0’ W)  SCANFISH & CTD  Jellyfish abundance: Tucker Trawl (Houde et al.)  Jellyfish gut content: Gel-net

Gelatinous Zooplankton in the Bay Dominant Species: M. leidyi Mnemiopsis leidyiCyanea capillata Chrysaora quinquecirrha Aurelia labiata Nemopsis bachei Beroe ovata

The relationship between gelatinous zooplankton and copepods Abundance (indv. M -3 ) More gelatinous zooplankton in hypoxic 2011, and correspondingly, less copepods. Inversely Correlated (Copepods data: Barba et al.)

2010 Gut contents analysis: average #copepod N Extremely hypoxic 2010-S Normal 2010-N Hypoxic DO Hypothesized Preyed #Copepod Results Ctenophore predation : Hypoxia > Normoxia > Extreme Hypoxia

Alternative hypothesis…. Copepods are flushed out of the bay Methods  Lagrangian TRANSport (LTRANS) V 2 (North et al., 2008) Chesapeake Bay Regional Ocean Modeling System (ROMS) (Li, Zhong, & Boicourt, 2005) Model set up: ● Initial location : North & South ● 5 releasing in 1997&1998 (1 st, 8 th, 15 th, 22 th and 29 th July, Duration = 31 days ) ● Behavior : +DVM, -DVM, Passive (Li, Zhong, & Boicourt, 2005) particles N S Depth = 0.25, 5, 10m

Preliminary Results Passive particles were more spread out. A gap between N & S (two way circulation) Ctenophores were concentrated in the right bank. (Longer daytime+ Coriolis Force)

Future study  Statistic Analysis: Factor Analysis  Feeding Experiment: impacts on microzooplankton  Model simulation: 2010 & 2011 ROMS with DO Initial location: randomly distribution Modified behavior code: Copepod +DVM Hypoxia avoidance Ctenophore - DVM Hypoxia avoidance Changing density with surrounding environment other A.tonsa eggs (sinking) Passive (Control).

~The End~ Thank you for your listening

MAY Aug10/ Jul 11 Sep DO Temp. S Hydrology N S Hypoxia (DO < 2 mg L -1 ) Temperature (T > 24 C) Salinity (PSU < 10) More hypoxic, warmer and lower salinity in 2011

 Low copepod biomass correlated with hypoxia Introduction Why?  Habitat squeeze  Less jump frequency Directly  Higher mortality  Lower egg hatching rate Indirectly Nauplii Hatched (%) (Roman et al 2003)A. tonsa (Decker et al., 2004) Ctenophore Clearance rate (Roman et al 2005) (modified from Pierson)