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Person

David C Roche

Biologist
Email: droche@usgs.gov
Office Phone: 954-377-5951
Fax: 954-377-5901
ORCID: 0000-0002-3329-2746

Location
NSU Center for Collaborative Research (CCR)
3321 College Avenue
Davie , FL 33314
US
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Seagrasses are highly productive ecosystems. A before-after-control-impact (BACI) design was used to examine effects of dredging on seagrasses and the animals that inhabit them. The control site North Biscayne Bay (NBB) and impacted site Port of Miami (POM) had seagrass densities decreased during the before, Fish and Invertebrate Assessment Network (FIAN) 2006-2011 and after, Faunal Monitoring Due to Harbor Dredging (FMHD) 2014-2016 studies. Turbidity levels increased at NBB and POM basins during the FMHD study, especially in 2016. Animal populations decreased significantly in NBB and POM in the FMHD study compared to the FIAN study. If seagrass communities are not stabilized, animal numbers will likely continue...
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Stable carbon and nitrogen isotope data from green turtles sampled at Dry Tortugas National Park, FL. Dataset includes: date collected, length, tissue type, percent of isotopes, calculated values of isotopes.
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This dataset includes details of loggerhead and green turtles captured and satellite tagged between 2009 and 2021; the turtles presented here have tracking days within Biscayne National Park. A subset of turtles was captured within Biscayne National Park, whereas others were tracked to the study site, and tagged elsewhere. The dataset contains information related to satellite tracking (e.g., tracking period), biology (e.g., sex, species), and animal behavioral mode determined from a switching state-space model (SSM). The SSM had a time step of 24 h (1 point per day), accounted for location error, and estimated movement parameters jointly across individuals to enhance behavioral mode estimation. Each SSM location...
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