Distribution and Condition of Intertidal Eastern Oyster (Crassostrea virginica) Reefs in Apalachicola Bay Florida Based on High-Resolution Satellite Imagery

Grizzle, Raymond E.; Ward, Krystin M.; Geselbracht, Laura; Birch, Anne

doi:10.2983/035.037.0514

Cited by 21 publications

(22 citation statements)

References 31 publications

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“…Our oyster density results over time and space also show declines in oyster counts, with the largest declines occurring in inshore areas, which may be becoming more like offshore and nearshore regions based on counts ( Figure 6). What is not known is whether these inshore losses are offset by the formation of new reefs elsewhere, although this could possibly be assessed through satellite, drone-based, or other surveys (Grizzle et al 2018;Windle et al 2019). Seavey et al (2011) reported the inland colonization of a salt marsh by oysters in inshore areas of Suwannee Sound, but those increases did not offset net losses experienced in nearshore and offshore reefs.…”

Section: Trends In Oyster Populations In the Gulf Of Mexicomentioning

confidence: 99%

“…Many species of oysters of the family Ostreidae are globally recognized as a critical estuarine component as they provide important ecosystem and fishery benefits (Gutiérrez et al 2003;Coen et al 2007;Carranza et al 2009;Grabowski et al 2012). Large declines in oyster populations have been observed at global (Beck et al 2011), continental (Zu Ermgassen et al 2012;Alleway and Connell 2015), regional (Seavey et al 2011;Wilberg et al 2011Wilberg et al , 2013, and local spatial scales (Pine et al 2015;Grizzle et al 2018). These losses have been widely documented, including localized extirpations in Australia (Alleway and Connell 2015) and large biomass reductions in the USA, particularly in the Chesapeake Bay and U.S. Gulf of Mexico regions, where the eastern oyster Crassostrea virginica is highly valued from cultural, fishery, and ecosystem service perspectives.…”

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Trends in Oyster Populations in the Northeastern Gulf of Mexico: An Assessment of River Discharge and Fishing Effects over Time and Space

et al. 2020

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Within the Big Bend region of the northeastern Gulf of Mexico, one of the least developed coastlines in the continental USA, intertidal and subtidal populations of eastern oyster Crassostrea virginica (hereafter referred to as "oyster") are a critical ecosystem and important economic constituent. We assessed trends in intertidal oyster populations, river discharge, and commercial fishing activity in the Suwannee River estuary within the Big Bend region using fisheries-independent data from irregular monitoring efforts and publicly available environmental data. We used generalized linear models to evaluate counts of oysters from line-transect surveys over time and space. We assessed model performance using simulation to understand potential bias and then evaluated whether these counts were related to freshwater inputs from the Suwannee River and commercial oyster fishing effort and landings at different time lags. We found that intertidal oyster counts have declined over time and that most of these declines are found in inshore intertidal oyster bars, which are becoming degraded. We also found a significant relationship between oyster counts and a 1-year lag on mean daily Suwannee River discharge, but including commercial fishery trips or landings did not improve model fit. It is unclear whether declines in intertidal oyster bars are offset by formation of new oyster reefs elsewhere. These results quantify rapid declines in intertidal oyster reefs in a region of coastline with high conservation value that can be used to inform ongoing and proposed restoration projects in the region.

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Section: Trends In Oyster Populations In the Gulf Of Mexicomentioning

confidence: 99%

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confidence: 99%

Trends in Oyster Populations in the Northeastern Gulf of Mexico: An Assessment of River Discharge and Fishing Effects over Time and Space

et al. 2020

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“…American oysters are dioecious, oviparous species of substantial commercial value (Eckelbarger and Davis 1996). Their distribution occurs along the east and west coasts of the USA as well as the east coast of Central and Northern South America, and even some coasts of Europe (Grizzle 1990, Eckelbarger andDavis 1996;Grizzle et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Elevated temperature attenuates ovarian functions and induces apoptosis and oxidative stress in the American oyster, Crassostrea virginica: potential mechanisms and signaling pathways

Nash

Johnstone

Rahman

2019

Cell Stress and Chaperones

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Global climate change is predicted to intensify thermal stress in marine and coastal organisms, affecting their development, growth, and reproductive functions. In this study, we performed histological observations on ovarian development, immunohistochemical analyses of ovarian heat shock protein-70 (HSP70), nitrotyrosine protein (NTP, an indicator of reactive nitrogen species (RNS)), and dinitrophenyl protein (DNP, an indicator of protein oxidation) expressions, in situ TUNEL assay for cellular apoptosis, biochemical analyses of ovarian caspase-3/7 activity and protein carbonyl (PC, a measure of reactive oxygen species (ROS)) contents, nitrate/nitrite (NOx) levels, and extrapallial fluid (EPF, an important body fluid) pH in the American oyster, Crassostrea virginica. Oysters were exposed to medium (28°C) and high (32°C) temperatures under controlled laboratory conditions for 1 week. Oysters exposed to higher temperatures significantly decreased the number and diameter of eggs, and EPF protein concentrations compared with controls (24°C). In contrast, EPF pH, ovarian HSP70 mRNA levels, and protein expression were increased after heat exposure, consistent with increased ovarian apoptosis. The enhanced apoptosis in ovaries was associated with increased ovarian caspase-3/7 activity, PC contents, NOx levels, and NTP and DNP expressions in heat-exposed oysters. Collectively, these results suggest that higher temperatures drastically increase RNS and ROS levels, increasing incidence of apoptosis and subsequently reducing ovarian functions in oysters.

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“…For instance, standard methods for studying intertidal reefs include quadrat sampling to quantify oyster densities (e.g., [18]), the use of GPS receivers to measure reef morphology in situ (e.g., [19]), and satellite imagery to quantify declines at a broader spatial scale (e.g., [20]). Satellite imagery is used as a cost-effective alternative to in situ sampling of intertidal reefs [20,21]; however, the coarse spatial resolution of data does not allow for analyses that are detailed enough for practical, fine-scale monitoring, management, and restoration efforts. Furthermore, satellite imagery does not always align with a favorable tidal stage in the area of interest, limiting what is discernible in the imagery.…”

Section: Introductionmentioning

confidence: 99%

Quantifying Intertidal Habitat Relative Coverage in a Florida Estuary Using UAS Imagery and GEOBIA

et al. 2020

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Intertidal habitats like oyster reefs and salt marshes provide vital ecosystem services including shoreline erosion control, habitat provision, and water filtration. However, these systems face significant global change as a result of a combination of anthropogenic stressors like coastal development and environmental stressors such as sea-level rise and disease. Traditional intertidal habitat monitoring techniques are cost and time-intensive, thus limiting how frequently resources are mapped in a way that is often insufficient to make informed management decisions. Unoccupied aircraft systems (UASs) have demonstrated the potential to mitigate these costs as they provide a platform to rapidly, safely, and inexpensively collect data in coastal areas. In this study, a UAS was used to survey intertidal habitats along the Gulf of Mexico coastline in Florida, USA. The structure from motion photogrammetry techniques were used to generate an orthomosaic and a digital surface model from the UAS imagery. These products were used in a geographic object-based image analysis (GEOBIA) workflow to classify mudflat, salt marsh, and oyster reef habitats. GEOBIA allows for a more informed classification than traditional techniques by providing textural and geometric context to habitat covers. We developed a ruleset to allow for a repeatable workflow, further decreasing the temporal cost of monitoring. The classification produced an overall accuracy of 79% in classifying habitats in a coastal environment with little spectral and textural separability, indicating that GEOBIA can differentiate intertidal habitats. This method allows for effective monitoring that can inform management and restoration efforts.

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Distribution and Condition of Intertidal Eastern Oyster (Crassostrea virginica) Reefs in Apalachicola Bay Florida Based on High-Resolution Satellite Imagery

Cited by 21 publications

References 31 publications

Trends in Oyster Populations in the Northeastern Gulf of Mexico: An Assessment of River Discharge and Fishing Effects over Time and Space

Trends in Oyster Populations in the Northeastern Gulf of Mexico: An Assessment of River Discharge and Fishing Effects over Time and Space

Elevated temperature attenuates ovarian functions and induces apoptosis and oxidative stress in the American oyster, Crassostrea virginica: potential mechanisms and signaling pathways

Quantifying Intertidal Habitat Relative Coverage in a Florida Estuary Using UAS Imagery and GEOBIA

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