Comparative ecophysiology of bloom-forming macroalgae in the Indian River Lagoon, Florida: Ulva lactuca, Hypnea musciformis, and Gracilaria tikvahiae

Whitehouse, Lisa N.A.; Lapointe, Brian E.

doi:10.1016/j.jembe.2015.06.012

Cited by 24 publications

(9 citation statements)

References 86 publications

(133 reference statements)

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“…Ulva blooms are seasonal phenomena where a large volume of coastal environment is taken over by Ulva biomass in a short period of time (Liu et al, 2010;Keesing et al, 2011). Among the abiotic factors that could trigger such events, the eutrophication of the estuarine environment can be considered as the main factor leading to the increasing number of blooms recorded worldwide (Smetacek and Zingone, 2013;Whitehouse and Lapointe, 2015). Here, we show a link between the nitrogen assimilation of Ulva strains and their growth, strengthening the causality between eutrophication and the occurrence of Ulva blooms.…”

Section: Ecophysiological Implications For Ulva Bloomssupporting

confidence: 65%

Extensive Variations in Diurnal Growth Patterns and Metabolism Among Ulva spp. Strains

et al. 2019

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Green macroalgae of the genus Ulva play a key role in coastal ecosystems and are of increasing commercial importance. However, physiological differences between strains and species have yet to be described in detail. Furthermore, the strains of Ulva used in aquaculture usually originate from opportunistic collection in the wild without prior selection of best performing strains. Hence, efforts are required to detect the potential variability in growth and metabolic accumulation between Ulva strains and ultimately select the best performing strains under given environmental conditions. Here, the growth, physiological, and metabolic characteristics of 49 laminar Ulva spp. strains were investigated using a custom-made high-throughput phenotyping platform, enzymatic assays, and gas chromatography-mass spectrometry. We found large natural variation for a wide range of growth and metabolic characteristics, with growth rates varying from 0.09 to 0.37 mg.mg 21 .d 21 among strains. Ulva spp. possess a unique diurnal growth pattern and primary metabolism compared with land plants, with higher growth rates during the night than during the light period. Starch and sucrose only contributed on average 35% of the carbon required to sustain Ulva's night growth. Nitrates accumulated during the night in Ulva tissues, and nitrate accumulation and consumption was positively correlated with growth. In addition, we identified six amino acids as possible biomarkers for high growth in Ulva. The large variability in growth and metabolite accumulation recorded among morphologically similar Ulva strains justifies future efforts in strain selection for increasing biomass, metabolite yields, and nutrient removal in the growing aquaculture industry.

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Section: Ecophysiological Implications For Ulva Bloomssupporting

confidence: 65%

Extensive Variations in Diurnal Growth Patterns and Metabolism Among Ulva spp. Strains

et al. 2019

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“…Ulva spp. also has a higher photosynthetic efficiency than other macroalgae species such as Gracilaria and Hypnea due to a higher ratio of surface area to volume reflected in its sheet-like structure (Whitehouse and Lapointe, 2015). Ulva species have a greater capability than other species to physiologically capitalize on the combination of higher temperatures, CO 2 enrichment and increased nitrogen loads anticipated due to climate change and ocean acidification (Parages et al, 2014;Chen et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Interannual Improvement in Sea Lettuce Blooms in an Agricultural Catchment

McGovern

Hartnett

2019

Front. Mar. Sci.

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Riverine nutrient loading from agriculture is one of the most prominent pressures in the second cycle of river basin management planning for the European Union (EU) Water Framework Directive (WFD). Better farmyard nutrient management planning is the measure most likely to reduce agricultural nutrient loading to catchment watercourses and coastal receiving waters. The adjoining Argideen Estuary and Courtmacsherry Bay in the south west of Ireland drain a 150 km 2 catchment comprising mainly agricultural land. The receiving waters were allocated Poor ecological status under the WFD at the most recent appraisal. Sub-hourly water quality monitoring in the Timoleague River has been carried out by the Teagasc Agricultural Catchments Program to track the changes in nutrient loading to the Argideen Estuary in response to improved farming practice. A bio-physical model of the adjoining Argideen Estuary and Courtmacsherry Bay was calibrated subject to the prevailing climatic and nutrient loading regime. Six nutrient load scenarios were simulated to determine their impact upon macroalgae and phytoplankton bloom magnitude. In addition, nutrient flow-load relationships were derived for summers 2010 and 2016 to elucidate the improvements induced by better catchment management practice. Flow-load relationships for dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) for each year were applied to the flow data for the other year, to query the outcome if (1) there had been no change in farm management practice between 2010 and 2016, or (2) the improved farm management practice in place by 2016 had been implemented by 2010. The difference between expediting and delaying improvement in farm nutrient management practice was a 5% increase in DIN loading and a 233% increase in DIP load. Application of this higher estimated load to the calibrated bio-physical model projected an increase in 2016 Ulva bloom magnitude from 381t to 1,391t. Although phosphorus retention within the catchment has improved in recent years, with an attendant improvement in Ulva bloom magnitudes, flow connectivity in the catchment still facilitates a higher phosphorus transfer during large rainfall events. A high amount of phosphorus is stored within the catchment, while point source pressures continue to contribute to phosphorus transfer to streams during periods of low flow.

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“…Se encontraron 7 especies importantes formadoras de florecimientos macroalgales, lo cual ha sido observado alrededor del mundo desde hace ya algunas décadas, en donde una o varias especies dominan el florecimiento por sobre las otras (e. g. Valiela et al 1997;Whitehouse & Lapointe, 2015). La biomasa macroalgal ha sido utilizada como un indicador en estudios de calidad del agua (Bricker et al 2003;, ya que esta se incrementa en respuesta al enriquecimiento de nutrientes que son generalmente de origen antropogénico (Sfriso & Marcomini 1997; Valiela et al 1997).…”

Section: Discussionunclassified

“…Por ejemplo, G. tikvahiae junto con Hypnea musciformis han formado florecimientos macroalgales en la Indian River Lagoon, Florida, que han estado asociados con el enriquecimiento de nutrientes. Estas especies pertenecientes a la División Rhodophyta, por su morfología están más adaptadas a desarrollarse en ambientes en donde las concentraciones de nutrientes son variables; estos se almacenan efectivamente cuando cuentan con pulsos altos (Lapointe, 1981;Whitehouse & Lapointe, 2015). Esto pudiera estar sucediendo en el sitio 5, donde la biomasa de Gracilaria fue la más alta, viéndose favorecida por la presencia de nutrientes de origen antropogénico.…”

Section: Discussionunclassified

Composición y fluctuación estacional de especies formadoras de florecimientos macroalgales en la laguna costera El Carmen, Cárdenas, Tabasco, golfo de México

2019

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La presencia, distribución y abundancia de macroalgas están relacionadas con variaciones de los parámetros físicos y químicos; el incremento en su biomasa se vincula al enriquecimiento, por nutrientes, de las zonas costeras, por actividades antropogénicas. Los florecimientos macroalgales están conformados por especies de macroalgas efímeras de rápido crecimiento. En el presente trabajo, se describen los cambios en la composición y biomasa de florecimientos macroalgales en una laguna costera. Durante 3 épocas del año, lluvias (octubre de 2015), nortes (febrero de 2016) y secas (julio de 2016), se midieron variables fisicoquímicas en 5 sitios de la laguna El Carmen, Cárdenas, Tabasco; también, biomasa macroalgal (método de transectos-cuadrantes). Las diferencias en las variables fisicoquímicas y la biomasa, entre épocas y sitios, se estimaron mediante análisis de varianza; igualmente, se realizó un análisis de componentes principales (ACP). Se obtuvieron 7 especies importantes. La mayor biomasa total correspondió a Gracilaria blodgetti (4225.1 g) seguida de Acanthophora spicifera (794.6 g). Los florecimientos macroalgales se encontraron solamente en el sitio 1 y en el 5, y se observó que, dependiendo de la época y el sitio, varió la composición de especies y la biomasa. El ACP mostró que la biomasa macroalgal está relacionada con las variables fisicoquímicas, dependiendo de la especie. En la región, las actividades antropogénicas que se realizan alrededor de las lagunas costeras impactan a estas últimas, por lo que este tipo de estudios es de importancia en el monitoreo de la laguna. Este es el primer estudio sobre florecimientos macroalgales en la región.

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Comparative ecophysiology of bloom-forming macroalgae in the Indian River Lagoon, Florida: Ulva lactuca, Hypnea musciformis, and Gracilaria tikvahiae

Cited by 24 publications

References 86 publications

Extensive Variations in Diurnal Growth Patterns and Metabolism Among Ulva spp. Strains

Extensive Variations in Diurnal Growth Patterns and Metabolism Among Ulva spp. Strains

Interannual Improvement in Sea Lettuce Blooms in an Agricultural Catchment

Composición y fluctuación estacional de especies formadoras de florecimientos macroalgales en la laguna costera El Carmen, Cárdenas, Tabasco, golfo de México

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