Effects of recent seagrass species change on habitat structure and function: Preliminary research proposal Emily French Summer 2013.

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Presentation transcript:

Effects of recent seagrass species change on habitat structure and function: Preliminary research proposal Emily French Summer 2013

Change in seagrass species in the Chesapeake Bay Z. marina declining in the Chesapeake Bay, only occupies 65% of area it did 20 years ago Modified from Orth et al www,helcom.com/fi

Change in seagrass species in the Chesapeake Bay Deteriorating water quality causing Z. marina to die back Disturbances can allow opportunistic species to thrive R. maritima is the second most prevalent grass in the polyhaline Bay, is a good colonizer that thrives when conditions are right R. maritima could be a potential replacement in areas where grasses co-occur

Hot off the press!

R. Maritima vs. Z. marina

Evidence near the York River, VA Orth lab 2012, unpublished data

Evidence near the York River, VA Orth lab 2012, unpublished dataMoore et al. in press

Research Questions 1. How do the structural components of Z. marina beds compare to those of R. maritima? 2. Does habitat value for associated faunal communities vary between R. maritima- dominated, Z. marina- dominated, and mixed species areas? 3. Are there sediment biogeochemical, microbiological, or erosion potential differences between the R. maritima- dominated, Z. marina-dominated, and mixed species areas?

Sites: Lower, polyhaline Chesapeake Bay Three Sites: Mobjack Bay between the Severn and Ware rivers, Goodwin Islands, Poquoson flats Three sampling areas within each site: Z. marina- dominated, R. maritima- dominated, mixed Five replicates within each sampling area (n=5)

Methods 5 replicates of each of the sample types will be taken within each of the sample areas. Meter square quadrat will be haphazardly tossed within 10 m of the PVC pole marking the sampling area.

Methods 1.Percent cover 2.Biomass core 3.Sediment core- sediment characteristics 4.Sediment core- microbial community 5.Faunal grab 6.Epiphytes 7.Erodibility Sample types:

Methods 1.Percent cover 2.Biomass core 3.Sediment core- sediment characteristics 4.Sediment core- microbial community 5.Faunal grab 6.Epiphytes 7.Erodibility Sample types:

Methods 1.Percent cover 2.Biomass core 3.Sediment core- sediment characteristics 4.Sediment core- microbial community 5.Faunal grab 6.Epiphytes 7.Erodibility Sample types:

Methods 1.Percent cover 2.Biomass core 3.Sediment core- sediment characteristics 4.Sediment core- microbial community 5.Faunal grab 6.Epiphytes 7.Erodibility Sample types: Community 1 Community 2

Methods 1.Percent cover 2.Biomass core 3.Sediment core- sediment characteristics 4.Sediment core- microbial community 5.Faunal grab 6.Epiphytes 7.Erodibility Sample types:

Methods 1.Percent cover 2.Faunal grab 3.Sediment core- sediment characteristics 4.Sediment core- microbial community 5.Biomass core 6.Epiphytes 7. Erodibility Sample types:

Methods 1.Percent cover 2.Faunal grab 3.Sediment core- sediment characteristics 4.Sediment core- microbial community 5.Biomass core 6.Epiphytes 7. Erodibility Sample types:

Timeline June Preliminary sampling at the height of Z. marina biomass August Second sampling at the height of R. maritima biomass

Thanks! Moore lab: Ken Moore, Erin Shields, Betty Neikirk, Steve Snyder Orth lab, Song lab, Duffy lab CB-NERRS WQ lab

Questions or suggestions?