Physiological responses of the seagrass Posidonia oceanica as indicators of fish farm impact

Pérez, Marta; García, Tania García; Invers, Olga; Ruiz, Juan Manuel García

doi:10.1016/j.marpolbul.2008.02.001

Cited by 66 publications

(60 citation statements)

References 79 publications

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“…Nutrient-addition experiments have shown that the P. oceanica epiphytic community responds in summer to the rise in the availability of nutrients with an increase in algal biomass (Leoni et al, 2006;Prado et al, 2008). The nutrient concentration of seagrass epiphytes is considered a good indicator of nutrient availability in the water column (Pérez et al, 2008) and, because the concentrations of nutrients in P. oceanica leaves and epiphytes are positively correlated (Alcoverro et al, 1997b), we assumed that inter-annual changes in nutrient concentration in P. oceanica leaves may reflect inter-annual variability of nutrient availability not only for P. oceanica but also for its epiphytic algae. Thus, the lack of correlation between the epiphyte load of P. oceanica shoots and the nutrient content of the leaves at Magaluf and Ses Salines suggests that inter-annual variability of epiphyte load in [2003][2004][2005][2006][2007][2008] was not driven by inter-annual differences in nutrient availability.…”

Section: Discussionmentioning

confidence: 99%

“…Dried leaves were ground to powder with a stainless steel ball mill (MM200 RETSCH, Haan, Germany) and a sub-sample of dried leaves of 6 out of the 10 shoots collected at each location and year was used to determine the concentration of nitrogen and phosphorus in the leaves. Nitrogen and phosphorus leaf content were considered as relative indicators of nutrient availability to seagrass (Duarte, 1990;McClelland and Valiela, 1998;Fourqurean et al, 2007;Pérez et al, 2008). Nitrogen content was determined using a Heraeus CHN-o-rapid elemental analyzer.…”

Section: Methodsmentioning

confidence: 99%

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Inter-annual variation of shoot density and biomass, nitrogen and phosphorus content of the leaves, and epiphyte load of the seagrass <i>Posidonia oceanica</i> (L.) Delile off Mallorca, western Mediterranean

Terrados¹,

Medina-Pons²

2010

Sci. Mar.

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SUMMARY:The epiphyte load, the ash content of the epiphytes, the leaf biomass, the nitrogen and phosphorus content of the leaves, and the density of shoots of the Mediterranean seagrass Posidonia oceanica (L.) Delile were monitored yearly from 2003 to 2008 in two shallow meadows off Mallorca (western Mediterranean) with the aim of identifying the responses of P. oceanica meadows to mid-term environmental variability. Inter-annual variability of P. oceanica meadows was significant for most of the descriptors examined: shoot biomass, epiphyte load, nitrogen and phosphorus content of the leaves, and shoot density. Shoot density increased by a factor of 2 and epiphyte load by a factor of 4 from 2003 to 2008. P. oceanica descriptors were generally not correlated with each other or with the average sea surface temperature during August. Long-term data series of descriptors of P. oceanica status are essential to improve understanding about the response of this important Mediterranean coastal ecosystem to natural and anthropogenic disturbances and to assess the effects of rapid global environmental change.Keywords: inter-annual variation, seagrass, epiphyte load, nitrogen, phosphorus, Posidonia oceanica, Western Mediterranean. RESUMEN: Variación interanual de la densidad de haces, biomasa foliar del haz, concentración de nitróge-no y fósforo en las hojas y de la carga de epífitos de la angiosperma marina Posidonia oceanica (L.) Delile en Mallorca, Mediterráneo occidental. -La carga de epífitos, el contenido en cenizas de los mismos, la biomasa foliar, el contenido en nitrógeno y fósforo de las hojas y la densidad de haces de la angiosperma marina Posidonia oceanica (L.) Delile se midieron anualmente desde 2003 a 2008 en dos praderas someras en Mallorca (Mediterráneo occidental) para identificar la respuesta de las praderas de P. oceanica a la variabilidad ambiental a medio plazo. Las praderas de P. oceanica presentan una gran variabilidad interanual pues la mayoría de los descriptores examinados (densidad de haces, biomasa foliar del haz, concentración de nitrógeno y fósforo en las hojas y carga de epífitos) cambiaron durante el periodo [2003][2004][2005][2006][2007][2008]. La densidad de haces se multiplicó por dos mientras que la carga de epífitos lo hizo por cuatro. No se encontró correlación entre la mayoría de los descriptores de P. oceanica ni tampoco con la temperatura del agua superficial del mar en agosto. La obtención de series temporales a largo plazo sobre descriptores del estado de las praderas de P. oceanica es necesaria para mejorar la comprensión de las respuestas de este importante ecosistema costero del Mediterráneo a perturbaciones naturales y antropogénicas y para evaluar los efectos del cambio global.Palabras clave: variación interanual, angiospermas marinas, epífitos, nitrógeno, fósforo, Posidonia oceanica, Mediterráneo occidental.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Inter-annual variation of shoot density and biomass, nitrogen and phosphorus content of the leaves, and epiphyte load of the seagrass <i>Posidonia oceanica</i> (L.) Delile off Mallorca, western Mediterranean

Terrados¹,

Medina-Pons²

2010

Sci. Mar.

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“…Plants require more P for higher growth rates (Ågren, 2004;Sterner and Elser, 2002), because P is required during the metabolic energy transfer process (Duarte, 1990;Stitt, 1997). Organic matter can result in low energy status of seagrasses (Erskine and Koch, 2000;Pérez et al, 2008), therefore negatively affect P uptake of seagrasses by increasing decomposition under low-oxygen conditions (Day et al, 1989;Pérez et al, 2007). Phosphate may play a key role in reducing ammonium toxicity (Brun et al, 2002(Brun et al, , 2008.…”

Section: Negative Effects Of Elevated Organic Matter On Individual Anmentioning

confidence: 99%

“…Physiological parameters (C, N and P content of seagrass tissues) were reported to be good indicators of saturating nutrient supply to an environment (e.g. Burkholder et al, 2007;Fourqurean and Zieman, 1992;Fourqurean et al, 1997;Pérez et al, 2008;van Katwijk et al, 2011). Seagrass morphological characteristics (e.g.…”

Section: Introductionmentioning

confidence: 99%

Individual and population indicators of Zostera japonica respond quickly to experimental addition of sediment-nutrient and organic matter

Han

Soissons

Chen

et al. 2017

Marine Pollution Bulletin

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“…Diverse and highly productive epiphytic assemblages composed mainly of microscopic algae are attached to the seagrass and macroalgae leave and benefit from this relationship by gaining a structure on which to grow and by consuming nutrients that the vegetation releases (Hauxwell et al 2001, Perez et al 2008.…”

Section: Introductionmentioning

confidence: 99%

Variability patterns of epibenthic microalgae in eastern Tunisian coasts

et al. 2017

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Summary: Epiphytic microalgae were monitored on various substrates of seagrass and macroalgae and in the water column for one year (from March 2013 to March 2014) in Oued Lafrann along the eastern coast of Chebba (Tunisia) with a focus on the distribution patterns of the epibenthic toxic dinoflagellates Ostreopsis cf. ovata, Prorocentrum lima and Coolia monotis. Microalgae assemblages were dominated by diatoms and dinoflagellates both in the water column and on vegetation. High concentrations of epiphytic toxic and potentially toxic dinoflagellates were preferentially hosted by Posidonia leaves, mainly in the apical and middle regions of the leaves, and P. lima was the dominant species. A significant positive correlation was found between P. lima concentrations on Posidonia and in the water column, suggesting that macrophytes should be sampled in the framework of harmful algal species monitoring. Ostreopsis cf. ovata, exhibited low concentrations and was mainly present on the inner surface of the Posidonia leaf, whereas P. lima was mainly present on the outer surface of the leaf, suggesting a likely space competition.Keywords: Prorocentrum lima; Ostreopsis cf. ovata; Coolia monotis; Prorocentrum micans; magnoliophytes; macroalgae. Patrones de variabilidad de las microalgas epibentónicas en la costa este tunecinaResumen: Las microalgas epifitas fueron monitorizadas en varios sustratos de praderas marinas, macroalgas y en la columna de agua durante un año (de marzo 2013 hasta marzo 2014) en Oued Lafrann, en la costa este de Chebba (Túnez), con especial atención a la distribución de dinoflagelados tóxicos epibénicos, como Ostreopsis cf. ovata, Prorocentrum lima y Coolia monotis. Las comunidades de microalgas estaban dominadas por diatomeas y dinoflagelados, tanto en la columna de agua como en la vegetación. Se encontraron elevadas concentraciones de dinoflagelados epífitos tóxicos preferentemente en las hojas de Posidonia, principalmente en las regiones apicales y media y Prorocentrum lima fue la especie epífita dominante. Se observó una correlación positiva significativa entre las concentraciones de P. lima en Posidonia y en la columna de agua, lo que sugiere el muestreo de esta macrófita como parte de la monitorización de especies nocivas. Las células de Ostreopsis cf. ovata mostraron concentraciones bajas y se encontraron principalmente en la superficie interior de la hoja de Posidonia contrariamente a la distribución de P. lima presente principalmente en la superficie exterior de la lámina. Este hecho probablemente sugiere una competencia espacial entre los dos microalgas tóxicas.

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Physiological responses of the seagrass Posidonia oceanica as indicators of fish farm impact

Cited by 66 publications

References 79 publications

Inter-annual variation of shoot density and biomass, nitrogen and phosphorus content of the leaves, and epiphyte load of the seagrass <i>Posidonia oceanica</i> (L.) Delile off Mallorca, western Mediterranean

Inter-annual variation of shoot density and biomass, nitrogen and phosphorus content of the leaves, and epiphyte load of the seagrass <i>Posidonia oceanica</i> (L.) Delile off Mallorca, western Mediterranean

Individual and population indicators of Zostera japonica respond quickly to experimental addition of sediment-nutrient and organic matter

Variability patterns of epibenthic microalgae in eastern Tunisian coasts

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