Relationships between blooms of Karenia brevis and hypoxia across the West Florida Shelf

Turley, Brendan D.; Karnauskas, Mandy; Campbell, Matthew D.; Hanisko, David S.; Kelble, Christopher R.

doi:10.1016/j.hal.2022.102223

Cited by 26 publications

(7 citation statements)

References 51 publications

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“…For example, in the state of Florida, the K. brevis concentration threshold for shellfish bed closures is 5 × 10 3 cells L −1 [88]. Further, fish kills can occur at K. brevis concentrations > 5 × 10 4 cells L −1 [88], which can result in subsequent hypoxia [89]. Likewise, human health risks due to aerosolized brevetoxins increase with bloom expansion, as respiratory irritation can occur at K. brevis concentrations as low as 1 × 10 3 cells L −1 [88], with increasing severity as concentrations exceed 1 × 10 6 cells L −1 [90].…”

Section: Discussionmentioning

confidence: 99%

Karenia brevis and Pyrodinium bahamense Utilization of Dissolved Organic Matter in Urban Stormwater Runoff and Rainfall Entering Tampa Bay, Florida

Muni-Morgan,

Lusk,

Heil

2024

Water

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This study investigated how nitrogen and dissolved organic matter (DOM) from stormwater runoff and rainfall support the growth of Karenia brevis and Pyrodinium bahamense. Excitation–emission matrix spectroscopy coupled with parallel factor analysis tracked changes in the optical properties of DOM in each bioassay, revealing greater reactivity of terrestrial humic-like DOM. Significant increases in cell yield and specific growth rates were observed upon additions of runoff for both species, with significant increases in specific growth rates upon the addition of a 2 in simulated rain event for P. bahamense only. By hour 48, 100% of the dissolved organic nitrogen (DON) in each treatment was utilized by P. bahamense, and by hour 72, over 50% of the DON was utilized by K. brevis. The percentage of bioavailable dissolved organic carbon (DOC) was greater for P. bahamense compared to K. brevis, suggesting a greater affinity for DOC compounds by P. bahamense. However, the bioavailability of DOM for each species could be owed to distinct chemical characteristics of labile DOM conveyed from each site. This study demonstrates that stormwater runoff and rainfall are both sources of labile DOM and DON for K. brevis and P. bahamense, which has implications for blooms of these species in Tampa Bay waters.

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Section: Discussionmentioning

confidence: 99%

Karenia brevis and Pyrodinium bahamense Utilization of Dissolved Organic Matter in Urban Stormwater Runoff and Rainfall Entering Tampa Bay, Florida

Muni-Morgan,

Lusk,

Heil

2024

Water

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“…The in situ K. brevis concentration data can also be biased due to opportunistic sampling and limited spatiotemporal coverage of the . Hypoxic zones tend to form in association with red tides 102 , however this effect was not included in the model due to the lack of dissolved oxygen data needed to generate the monthly driver maps for Ecospace. Ecospace predicts biomass dynamics over a two-dimensional grid which limits the ability to capture the vertical dynamics of red tides.…”

Section: Discussionmentioning

confidence: 99%

Evaluating red tide effects on the West Florida Shelf using a spatiotemporal ecosystem modeling framework

Vilas

Buszowski

Sagarese

et al. 2023

Sci Rep

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The West Florida Shelf (WFS), located in the eastern Gulf of Mexico, fosters high species richness and supports highly valuable fisheries. However, red tide events occur regularly that can impact fisheries resources as well as ecosystem state, functioning, and derived services. Therefore, it is important to evaluate and quantify the spatiotemporal impacts of red tides to improve population assessments, mitigate potential negative effects through management, and better understand disturbances to support an ecosystem-based management framework. To model red tide effects on the marine community, we used Ecospace, the spatiotemporal module of the ecosystem modeling framework Ecopath with Ecosim. The inclusion of both lethal and sublethal response functions to red tide and a comprehensive calibration procedure allowed to systematically evaluate red tide effects and increased the robustness of the model and management applicability. Our results suggest severe red tide impacts have occurred on the WFS at the ecosystem, community, and population levels in terms of biomass, catch, and productivity. Sublethal and indirect food-web effects of red tide triggered compensatory responses such as avoidance behavior and release from predation and/or competition.. This study represents a step forward to operationalize spatiotemporal ecosystem models for management purposes that may increase the ability of fisheries managers to respond more effectively and be more proactive to episodic mortality events, such as those caused by red tides.

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“…The sinking and decomposition of dead algal cells that occur during an HAB can deplete dissolved oxygen and result in hypoxia causing widespread mortality and recruitment failures of scallops (Tenore 1972, Bricelj & Kuenstner 1989). Turley et al (2022) identified that K. brevis blooms on the Florida Gulf Coast that begin in summer and persist into the fall were linked to hypoxia events. In this study, increased dissolved oxygen concentrations in the fall were observed to have a positive effect on bay scallop abundance.…”

Section: Discussionmentioning

confidence: 99%

Environmental Drivers of Bay Scallop (Argopecten irradians concentricus) Abundance along the Florida Gulf Coast

Granneman,

Levine,

Baxley

et al. 2023

Journal of Shellfish Research

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The Florida bay scallop (Argopecten irradians concentricus Say, 1822) is a relatively short-lived species that resides in dynamic marine systems and is subject to multiple stressors, although the environmental drivers of bay scallop abundance along the Florida Gulf Coast are not well understood. The use of an ecosystem approach to fisheries management may be particularly relevant for short-lived species that are highly susceptible to environmental changes, but this approach requires an understanding of how environmental variables, such as salinity and temperature, may influence bay scallops throughout their range. This study was designed to identify the relationships between environmental variables and bay scallop abundance and to evaluate the relative effect of these relationships. Scallop surveys conducted in the spring and fall along the Florida Gulf Coast from 1992 to 2019 were compared with seasonal water quality parameters, streamflow discharge, precipitation, wind speed, and climate indices. The size and spawning success of the fall scallop population were negatively affected by relatively high Karenia brevis counts, low dissolved oxygen, and low phosphorus availability. During the period of early postsettlement growth in the winter, scallops were negatively impacted by salinities outside the range of 22–27 due to increased rainfall and low nitrogen availability. Finally, the factors that negatively affected juvenile scallop growth and survival in the spring included increased rainfall and wind speed resulting in relatively high turbidity and comparatively low chlorophyll a.

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Relationships between blooms of Karenia brevis and hypoxia across the West Florida Shelf

Cited by 26 publications

References 51 publications

Karenia brevis and Pyrodinium bahamense Utilization of Dissolved Organic Matter in Urban Stormwater Runoff and Rainfall Entering Tampa Bay, Florida

Karenia brevis and Pyrodinium bahamense Utilization of Dissolved Organic Matter in Urban Stormwater Runoff and Rainfall Entering Tampa Bay, Florida

Evaluating red tide effects on the West Florida Shelf using a spatiotemporal ecosystem modeling framework

Environmental Drivers of Bay Scallop (Argopecten irradians concentricus) Abundance along the Florida Gulf Coast

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