emily french summer 2013
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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. - PowerPoint PPT PresentationTRANSCRIPT
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Effects of recent seagrass species change on habitat structure and function:
Preliminary research proposal
Emily FrenchSummer 2013
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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. 2001
www,helcom.com/fi
www.kinrm.sa.gov.au
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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
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Hot off the press!
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R. Maritima vs. Z. marina
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R. Maritima vs. Z. marina
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R. Maritima vs. Z. marina
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R. Maritima vs. Z. marina
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Evidence near the York River, VA
Orth lab 2012, unpublished data
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Evidence near the York River, VA
Orth lab 2012, unpublished data Moore et al. in press
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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?
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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)
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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.
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Methods
1. Percent cover2. Biomass core3. Sediment core-
sediment characteristics
4. Sediment core- microbial community
5. Faunal grab6. Epiphytes7. Erodibility
Sample types:
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Methods
1. Percent cover2. Biomass core3. Sediment core-
sediment characteristics
4. Sediment core- microbial community
5. Faunal grab6. Epiphytes7. Erodibility
Sample types:
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Methods
1. Percent cover2. Biomass core3. Sediment core-
sediment characteristics
4. Sediment core- microbial community
5. Faunal grab6. Epiphytes7. Erodibility
Sample types:
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Methods
1. Percent cover2. Biomass core3. Sediment core-
sediment characteristics
4. Sediment core- microbial community
5. Faunal grab6. Epiphytes7. Erodibility
Sample types:
Community 1
Community 2
http://biology.clc.uc.edu/
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Methods
1. Percent cover2. Biomass core3. Sediment core-
sediment characteristics
4. Sediment core- microbial community
5. Faunal grab6. Epiphytes7. Erodibility
Sample types:
![Page 19: Emily French Summer 2013](https://reader035.vdocument.in/reader035/viewer/2022062411/56816707550346895ddb6f90/html5/thumbnails/19.jpg)
Methods
1. Percent cover2. Faunal grab3. Sediment core-
sediment characteristics
4. Sediment core- microbial community
5. Biomass core6. Epiphytes7. Erodibility
Sample types:
www.kinrm.sa.gov.au
![Page 20: Emily French Summer 2013](https://reader035.vdocument.in/reader035/viewer/2022062411/56816707550346895ddb6f90/html5/thumbnails/20.jpg)
Methods
1. Percent cover2. Faunal grab3. Sediment core-
sediment characteristics
4. Sediment core- microbial community
5. Biomass core6. Epiphytes7. Erodibility
Sample types:
http://gescience.com/UGEMS.html
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Timeline
• June 2013- Preliminary sampling at the height of Z. marina biomass
• August 2013- Second sampling at the height of R. maritima biomass
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Thanks!• Moore lab: Ken Moore, Erin Shields, Betty Neikirk, Steve
Snyder• Orth lab, Song lab, Duffy lab• CB-NERRS WQ lab
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Questions or suggestions?