Macrophyte community response to nitrogen loading and thermal stressors in rapidly flushed mesocosm systems

Kaldy, James E.; Brown, Cheryl; Nelson, Walter G.; Frazier, Melanie

doi:10.1016/j.jembe.2017.09.022

Cited by 10 publications

(8 citation statements)

References 54 publications

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“…This is consistent with residence times in the lower Yaquina estuary that were estimated as 1 d (2 tidal cycles) under high river discharge conditions, and from 1-10 days under low river discharge (Lemagie and Lerczak, 2015). More recent mesocosm experiments (Kaldy et al, 2017), which varied both temperature and nutrient loads under high water turnover rates to mimic conditions in PNW estuaries, found limited nutrient impacts on macrophytes except at higher water temperatures. In the face of the many possible ecosystem characteristics that affect the expression of vegetation response to elevated nutrients (Cloern, 2001), Krause-Jensen et al (2008) reviewed the empirical relationships of marine vegetation to eutrophication and concluded that to generalize from cross system comparisons remains extremely difficult.…”

Section: Epiphyte Load In Relation To Nutrientssupporting

confidence: 86%

“…In some estuaries in the region (Table 1), light reduction from epiphyte loads could already potentially impact seagrass. Mesocosm experiments indicate that Z marina should be particularly susceptible to the multiple effects of nutrients, including epiphyte increases, as environmental temperatures rise (Bintz et al, 2003;Kaldy and Shafer, 2013;Kaldy, 2014;Kaldy et al, 2017). Ruggerio et al (2010) suggested that the river dominated portions of Oregon estuaries were most likely to experience increased water temperatures with climate change.…”

Section: Epiphyte Load In Relation To Nutrientsmentioning

confidence: 99%

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An evaluation of factors controlling the abundance of epiphytes on Zostera marina along an estuarine gradient in Yaquina Bay, Oregon, USA

Nelson

2018

Aquatic Botany

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Epiphytes on seagrass () growing in the lower intertidal were examined along an estuarine gradient within Yaquina Bay, Oregon over a period of 4 years. The Yaquina Estuary receives high levels of nutrients from the watershed during the wet season and from the ocean during the dry season. Mean epiphyte biomass per unit seagrass leaf surface area (epiphyte load) peaked during the summer, and thus epiphyte load was higher during dry season than wet season in both marine and riverine dominated regions. Epiphyte load was greater in marine than in riverine dominated areas in both wet and dry seasons, although only dry season differences were significant. There was no evidence that grazers controlled epiphyte load differences. Annual DIN concentration was inversely related to epiphyte load, principally because of elevated wet season dissolved inorganic nitrogen from river inputs. While there was a positive annual relation of epiphyte load to PO concentration, it is not clear that phosphorus becomes a limiting nutrient for epiphyte growth. Water column light attenuation tends to increase linearly with distance from the estuary mouth, while both epiphyte load and biomass tend to decrease. Both seagrass and seagrass epiphytes may be increasingly light limited in the upper estuary, and thus, epiphyte loads may have proportionally more impact on seagrass occurrence in this estuarine region.

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Section: Epiphyte Load In Relation To Nutrientssupporting

confidence: 86%

Section: Epiphyte Load In Relation To Nutrientsmentioning

confidence: 99%

An evaluation of factors controlling the abundance of epiphytes on Zostera marina along an estuarine gradient in Yaquina Bay, Oregon, USA

Nelson

2018

Aquatic Botany

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“…Therefore, the interaction between stressors is now viewed as a critical issue, and it is suggested that single-factor experiments are not adequate for assessing the effects of several disturbances on coastal marine ecosystems (Wernberg et al, 2012;Todgham and Stillman, 2013;Ontoria et al, 2019b). In the last years, an increasing number of papers aiming to understand cumulative impacts of stressors have exponentially increased (Gunderson et al, 2016;Adams et al, 2020;Stockbridge et al, 2020), and more empirical data on the effects of the interaction of increasing temperature and nutrient over-enrichment at an individual level has been obtained (Touchette and Burkholder, 2002;Bintz et al, 2003;Touchette et al, 2003;Burnell et al, 2013;Kaldy, 2014;Kaldy et al, 2017;Egea et al, 2018;Moreno-Marín et al, 2018;Mvungi and Pillay, 2019;Ontoria et al, 2019b). Nevertheless, responses depend on their local adaptation and life history traits (Tuya et al, 2019;Anton et al, 2020) are species-specific, and to our knowledge, there is very limited information about the combined effects of these two stressors in any tropical seagrasses species (Artika et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Species-Specific Trait Responses of Three Tropical Seagrasses to Multiple Stressors: The Case of Increasing Temperature and Nutrient Enrichment

2020

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Seagrass meadows are declining globally. The decrease of seagrass area is influenced by the simultaneous occurrence of many factors at the local and global scale, including nutrient enrichment and climate change. This study aims to find out how increasing temperature and nutrient enrichment affect the morphological, biochemical and physiological responses of three coexisting tropical species, Thalassia hemprichii, Cymodocea serrulata and Halophila stipulacea. To achieve these aims, a 1-month experiment under laboratory conditions combining two temperature (maximum ambient temperature and current average temperature) and two nutrient (high and low N and P concentrations) treatments was conducted. The results showed that the seagrasses were differentially affected by all treatments depending on their lifehistory strategies. Under higher temperature treatments, C. serrulata showed photoacclimation strategies, while T. hemprichii showed decreased photo-physiological performance. In contrast, T. hemprichii was resistant to nutrient over-enrichment, showing enhanced nutrient content and physiological changes, but C. serrulata suffered BG nutrient loss. The limited response of H. stipulacea to nutrient enrichment or high temperature suggests that this seagrass is a tolerant species that may have a dormancy state with lower photosynthetic performance and smaller-size individuals. Interaction between both factors was limited and generally showed antagonistic effects only on morphological and biochemical traits, but not on physiological traits. These results highlight the different effects and strategies co-inhabiting seagrasses have in response to environmental changes, showing winners and losers of a climate change scenario that may eventually cause biodiversity loss. Trait responses to these stressors could potentially make the seagrasses weaker to cope with following events, due to BG biomass or nutrient loss. This is of importance as biodiversity loss in tropical seagrass ecosystems could change the overall effectiveness of ecosystem functions and services provided by the seagrass meadows.

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“…Aunque varios estudios indican que la descarga de nutrientes desde las áreas costeras ha llevado a una disminución de las praderas marinas (Orth et al, 2006), afectando su biomasa (Kaldy et al, 2017), su integridad estructural (Burkholder et al, 1992) y facilitando la penetración de Labyrinthula spp. (Vergeer et al, 1995), los resultados en este caso no mostraron diferencias significativas entre los niveles de nutrientes presentes entre las praderas de los tres sectores analizados, que permita establecer una relación directa con la incidencia de la enfermedad.…”

Section: Discussionunclassified

Enfermedad del desgaste en praderas de Thalassia testudinum (Hydrocharitaceae) y su relación con el perfil metabólico

Castro-González¹,

Gómez-López²,

Sánchez-Valencia³

et al. 2022

Rev. Biol. Trop.

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Introducción: Los protistas del género Labyrinthula causan la denominada “Enfermedad del desgaste” en el pasto marino, Thalassia testudinum. Desde el 2008 los monitoreos en el Caribe colombiano han mostrado variación espacial y temporal en la incidencia de la enfermedad, pero sin la alta mortalidad observada en otras regiones del mundo. Objetivo: Analizar algunos parámetros epidemiológicos en T. testudinum y comparar metabolitos entre plantas sanas e infectadas. Métodos: Registramos la severidad, incidencia y prevalencia de esta enfermedad en el Parque Nacional Natural Tayrona e Isla de Providencia, y analizamos muestras de agua y sedimentos. Además, aplicamos cromatografía líquida y de gases, junto con espectrometría de masas, a extractos metanólicos de muestras de hojas y rizomas de brotes sanos e infectados. Resultados: Las praderas se encontraban en buen estado, a pesar de la escasez de brotes de fanerógamas marinas en Tayrona y una alta incidencia (15 %) y severidad (355 %) de la enfermedad en Providencia. Las plantas infectadas tenían niveles más bajos de fenoles, flavonoides y azúcares. Las flavonas sulfatadas con aglicona luteolina y diosmetina, los esteroles (sitosterol y estigmasterol) y las oxilipinas volátiles se acumularon en las hojas (3-hidroxi-2-isopentanona) y los ácidos isopentanoico y octadecatrienoico en los rizomas. Conclusiones: Estos pastos marinos colombianos tienen producción diferencial de metabolitos. Probablemente como una defensa exitosa, aún a niveles bajos de severidad (0.1 %) e incidencia (1 %) de la enfermedad.

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Macrophyte community response to nitrogen loading and thermal stressors in rapidly flushed mesocosm systems

Cited by 10 publications

References 54 publications

An evaluation of factors controlling the abundance of epiphytes on Zostera marina along an estuarine gradient in Yaquina Bay, Oregon, USA

An evaluation of factors controlling the abundance of epiphytes on Zostera marina along an estuarine gradient in Yaquina Bay, Oregon, USA

Species-Specific Trait Responses of Three Tropical Seagrasses to Multiple Stressors: The Case of Increasing Temperature and Nutrient Enrichment

Enfermedad del desgaste en praderas de Thalassia testudinum (Hydrocharitaceae) y su relación con el perfil metabólico

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