Quantifying the Benefits of Estuarine Habitat Restoration in the Gulf of Mexico: an Introduction to the Theme Section

Carle, Melissa Vernon; Benson, Kristopher G.; Reinhardt, James F.

doi:10.1007/s12237-020-00807-z

Cited by 7 publications

(2 citation statements)

References 141 publications

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“…The lowering of pH in water in this area also could be a result of the decomposition of organic matter and humic acid water (Sammut et al, 1995). The estuarine ecosystem is important as the area is critical natural habitat (Carle, Benson, & Reinhardt, 2020) has significant economic value (Liu et al, 2020), performs environmental services (Carstensen et al, 2019) and acts as protective buffers (Pavoni et al, 2021). Anthropogenic activities would affect the natural balance of the estuarine ecosystem (Hillman et al, 2020) and impose increased pressure on vital natural resources (Serrao-Neumann et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

Sustainable Management of the Coastal Water pH of Pulau Tuba Using the Inverse Distance Weighted (IDW) Method

Kamaruddin

Aziz

Roslani

et al. 2021

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The purpose of this research is to evaluate the precision of the Inverse Distance Weighted (IDW) to estimate and map the coastal water pH for the sustainability of Pulau Tuba, Langkawi, Kedah. 30 sampling points have been set up during two sampling activities in November 2018. The pH meter has been calibrated and lowered to 1 meter below the water surface to measure the reading of pH. The development of the spatial model was developed using the spatial analyst tool available in ArcGIS Software. Several types of statistical analyses were carried to compare the observed and predicted value of pHs such as correlation analysis, regression analysis, and error analysis. Accuracy assessment was carried later after the transformation of a spatial model into a surface map. The research found that the IDW method successfully interpolated the pH readings. The research found that there is a strong positive correlation between the observed and predicted values. For error analysis, Mean Absolute Error (MAE) and Root Mean Square Error (RMSE) were recorded at 0.033 and 0.044, respectively. After the transformation of the spatial model to the surface map, the accuracy of the map is recorded at 81.25%. The map produced can be used by residents and local government for social and economic development and protection of biodiversity at the coastal water of Pulau Tuba, Langkawi, Kedah.

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Section: Resultsmentioning

confidence: 99%

Sustainable Management of the Coastal Water pH of Pulau Tuba Using the Inverse Distance Weighted (IDW) Method

Kamaruddin

Aziz

Roslani

et al. 2021

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“…Due to the ecological and economic importance of C. virginica populations to coastal regions, oyster habitat in the USA is being restored in Chesapeake Bay and many other systems (e.g., Pamlico Sound, Long Island Sound, Gulf of Mexico) (USACE 2012; Puckett et al 2014;McCann 2018;Carle et al 2020). In these systems, the primary means of producing C. virginica for restoration, replenishing the public fishery, and supporting aquaculture in regions with low natural recruitment is spat-on-shell (SOS) production in remote setting facilities (Congrove et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Direct Setting of Eastern Oyster (Crassostrea virginica) Larvae Confirmed with Calcein, a Fluorochrome Dye

Spires

North

Westby

et al. 2023

Estuaries and Coasts

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Ongoing efforts to restore eastern oyster (Crassostrea virginica) populations in regions of low natural recruitment rely on stocking of juveniles (spat on shell) to rebuild populations. Often, remote setting is used, entailing releasing hatcheryproduced larvae into recirculating tanks filled with oyster shells. Other restoration methods that rely on releasing C. virginica larvae directly onto the shell in situ, called "direct setting," have shown promise but were unable to definitively prove larval origin without the use of enclosures. The objective of this study was to determine if tagging C. virginica with calcein, a fluorochrome dye, could be a viable method for confirming larval origin in studies of direct setting in Chesapeake Bay. To do so, C. virginica larvae conditioned in water from adult C. virginica were marked with calcein and released by divers directly onto three 3.6-m 2 research sites constructed of oyster shell bags during July 2019 and September 2019 and recovered after 7 days. All shell bags were moved to flow-through tanks on land and spat on a subsample of valves were counted in each bag 8-12 days after deployment. Spat on the remaining valves were counted 42 to 46 days post deployment. A total of 119,020 spat were found on 84 shell bags from the two deployments during the initial settlement counts conducted just after shell bags were recovered. All recovered juveniles that were viewed under blue light excitation (n = 84) contained the calcein tag, indicating that these spat were derived from larvae released over the reefs. Initial settlement efficiencies on the sites ranged from 0.1 to 3.4% in July and September, respectively. The salinities experienced in July were below average and may have contributed to reduced larval survival compared to that in September. Shell bags contained zero to 90 spat per shell. Spat settlement was greatest closest to where the larvae were released (87% of spat were found in 12% of bags; the high-count bags were clustered around the larval release locations). Overall, 6 shell bags out of 190 deployed had spat per shell estimates similar to remote larval setting (hatchery) targets (10-20 spat per shell) and 6 had spat per shell values higher than hatchery targets. The presence of the calcein mark in recovered spat confirmed larval origin, and together with the observed setting efficiencies suggests there is promise for developing remote larval setting as a stock enhancement technique. However, more work is needed to understand the limitations of the technique, including its efficaciousness at a larger scale. KeywordsOyster • Calcein • Fluorochrome dye • Crassostrea virginica • Marking • Mark and recapture • Direct setting Communicated by Eric N. Powell.

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Whole-Ecosystem Experiment Illustrates Short Timescale Hydrodynamic, Light, and Nutrient Control of Primary Production in a Terminal Slough

Loken

Sadro

Lenoch

et al. 2022

Estuaries and Coasts

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Estuaries are among the most productive of aquatic ecosystems. Yet the collective understanding of patterns and drivers of primary production in estuaries is incomplete, in part due to complex hydrodynamics and multiple controlling factors that vary at a range of temporal and spatial scales. A whole-ecosystem experiment was conducted in a deep, pelagically dominated terminal channel of the Sacramento-San Joaquin Delta (California, USA) that seasonally appears to become nitrogen limited, to test whether adding calcium nitrate would stimulate primary productivity or increase phytoplankton density. Production did not respond consistently to fertilization, in part because nitrate and phytoplankton were dispersed away from the manipulated area within 1–3 days. Temporal and spatial patterns of gross primary production were more strongly related to stratification and light availability (i.e., turbidity) than nitrogen, highlighting the role of hydrodynamics in regulating system production. Similarly, chlorophyll was positively related not only to stratification but also to nitrogen—with a positive interaction—suggesting stratification may trigger nutrient limitation. The average rate of primary production (4.3 g O2 m−2 d−1), metabolic N demand (0.023 mg N L−1 d−1), and ambient dissolved inorganic nitrogen concentration (0.03 mg N L−1) indicate that nitrogen can become limiting in time and space, especially during episodic stratification events when phytoplankton are isolated within the photic zone, or farther upstream where water clarity increases, dispersive flux decreases, and stratification is stronger and more frequent. The role of hydrodynamics in organizing habitat connectivity and regulating physical and chemical processes at multiple temporal and spatial scales is critical for determining resource availability and evaluating biogeochemical processes in estuaries.

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Quantifying the Benefits of Estuarine Habitat Restoration in the Gulf of Mexico: an Introduction to the Theme Section

Cited by 7 publications

References 141 publications

Sustainable Management of the Coastal Water pH of Pulau Tuba Using the Inverse Distance Weighted (IDW) Method

Sustainable Management of the Coastal Water pH of Pulau Tuba Using the Inverse Distance Weighted (IDW) Method

Direct Setting of Eastern Oyster (Crassostrea virginica) Larvae Confirmed with Calcein, a Fluorochrome Dye

Whole-Ecosystem Experiment Illustrates Short Timescale Hydrodynamic, Light, and Nutrient Control of Primary Production in a Terminal Slough

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