Reproducible multi-parameter acoustic detection of seasonal drift macroalgae in the Indian River Lagoon, Florida

Foster, Greg; Riegl, Bernhard; Morris, Lori J.; Foster, Kristi

doi:10.1007/s11852-018-0593-1

Cited by 2 publications

(4 citation statements)

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“…An increased likelihood of such blooms could be driven by climate change because green algae tolerated relatively high temperatures (Menéndez and Comín, 2000). Furthermore, blooms of DMA have been shown to shade seagrasses or self-shade, which increased concentrations of nutrients in the water column due to decomposition (Holmquist, 1994(Holmquist, , 1997Hauxwell et al, 2001;Cummins et al, 2004;Gao et al, 2013;Foster et al, 2018). Additionally, Fox et al (2008) stated that Cladophora vagabunda and G. tikvahiae in locations with higher nitrogen loads from their watersheds stored up to 250% of the annual load.…”

Section: Discussionmentioning

confidence: 99%

“…Hydroacoustic data were acquired with a BioSonics DT-X echosounder and two multiplexed, single-beam digital transducers with full beamwidths of 10 • (38 kHz) and 6.4 • (418 kHz), operated at 5-Hz and 0.4 ms pulse duration (Riegl and Bushkirk, 2016;Foster et al, 2018). Surveys focused on water deeper than approximately 1.3 m. The east-west survey lines were spaced a minimum of 200 m and maximum of 400 m apart.…”

Section: Hydroacoustic Surveysmentioning

confidence: 99%

“…Surveys focused on water deeper than approximately 1.3 m. The east-west survey lines were spaced a minimum of 200 m and maximum of 400 m apart. Data were post-processed using BioSonics Visual Bottom Typer (VBT; Foster et al, 2018). To estimate percent cover of DMA, samples of algae and video were collected along the line of the hydroacoustic surveys, and wet weights were recorded.…”

Section: Hydroacoustic Surveysmentioning

confidence: 99%

“…Based on these samples, the acoustic signals were grouped into a supervised training catalog for bare substrate, sparse algae, dense algae, and other vegetation. Using the catalog and the estimated conversion factor, counts of the acoustic signals in each class were used to estimate wet biomass, and the conversion factor calculated for samples from seining was used to estimate dry biomass (Riegl and Bushkirk, 2016;Foster et al, 2018).…”

Section: Hydroacoustic Surveysmentioning

confidence: 99%

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Spatiotemporal Patterns in the Biomass of Drift Macroalgae in the Indian River Lagoon, Florida, United States

et al. 2022

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Drift macroalgae plays key roles in the ecology of many coastal systems, including the Indian River Lagoon. In the lagoon, changes in the biomass of drift macroalgae may have interacted with an unprecedented bloom of phytoplankton in 2011. Patterns in the biomass of drift macroalgae were identified using new and original analyses of data from several sampling programs collected between 1997 and 2019. All available data show a relatively low biomass of drift macroalgae in 2010–2012, and surveys of fixed transects and seining as part of a fisheries independent monitoring program also recorded low biomass in 2016. Low light availability and potentially stressful temperatures appeared to be the main influences as indicated by the results of incubations in tanks to determine environmental tolerances and data on ambient conditions. Decreased biomass of drift macroalgae had implications for cycling of nutrients because carbon, nitrogen, and phosphorus not stored in the tissues of drift macroalgae became available for uptake by other primary producers, including phytoplankton. The estimated 14–18% increases in concentrations of these elements in the IRL could have promoted longer and more intense phytoplankton blooms, which would have reduced light availability and increased stress on algae and seagrasses. An improved understanding of such feedback and the ecological roles played by drift macroalgae will support more effective management of nutrient loads and the system by accounting for cycling of nutrients among primary producers.

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