Phenology of the Mediterranean seagrass Posidonia oceanica (L.) Delile: Medium and long-term cycles and climate inferences

Peirano, Andrea; Cocito, Silvia; Banfi, Valeria; Cupido, Roberta; Damasso, Valentina; Farina, G.E.; Lombardi, Chiara; Mauro, Roberta Di; Morri, Carla; Roncarolo, Ingrid; Saldaña, Sarahi; Savini, Dario; Sgorbini, Sergio; Silvestri, Cecilia; Stoppelli, Nicola; Torricelli, Leonardo; Bianchi, Carlo Nike

doi:10.1016/j.aquabot.2010.11.007

Cited by 35 publications

(39 citation statements)

References 54 publications

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“…; Peirano et al . ). These variations may be due to differences in hydrodynamic or light intensity related to the shape and orientation of the leaves because if we look at the arrangement of leaves in terms of sunlight and hydrodynamics, the inner surface of adult and intermediate leaves seems to be the most exposed (Borowitzka & Lethbridge ).…”

Section: Discussionmentioning

confidence: 97%

Temporal and spatial zonation of macroepiphytes on Posidonia oceanica (L.) Delile leaves in a meadow off Tunisia

Mabrouk

Hamza²,

Bradai³

2014

Marine Ecology

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The aim of this survey was to study the cover and the composition of macroepiphytic species on the leaves of Posidonia oceanica in the east of Tunisia. Surveys were conducted in December 2009 (winter period), March (spring period) and August 2010 (summer period) in a fringing reef located in Chebba. At each sampling date, 15 adult leaves were randomly collected and divided into basal and apical parts. The inner face of each part was examined with ocular glasses and microscope to estimate species cover by orthogonal projection. PERMANOVA and ANOSIM were used to test for differences of cover between sampling dates and leaf parts. SIMPER, cluster analysis, and PCA were used to ordinate species assemblages. Comparison of epiphytic cover along leaf blades showed significant differences for all groups, except cyanophycea, with high cover of hydrozoans and bryozoans in the basal part and high cover of algae in the apical part. The species composition and cover also vary with sampling date; minimum values were detected in December and the epiphytic community was composed of a few pioneer species, whereas maximum epiphytic cover values were registered in August, with the epiphytic community being composed of a more mature and more diverse community, termed 'climax'. The main regulatory factors for this distribution are discussed.

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Section: Discussionmentioning

confidence: 97%

Temporal and spatial zonation of macroepiphytes on Posidonia oceanica (L.) Delile leaves in a meadow off Tunisia

Mabrouk

Hamza²,

Bradai³

2014

Marine Ecology

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“…The list of epiphyte species recorded here on the leaves of P. oceanica in Eastern Tunisia shows that most of the species are in common with those in other parts of the Mediterranean Sea (Balata et al., ; Jacquemart & Demoulin, ; Nesti et al., ; Peirano et al., ; Tsirika et al., ). Differences amongst Mediterranean basins are generated by differences in hydrodynamic conditions, exposure to Atlantic currents and gradients in water temperature (Margalef, ).…”

Section: Discussionmentioning

confidence: 85%

“…To identify epiphyte species, six other random shoots were taken within each quadrat and the internal faces of the two external leaves (adult leaves) of each shoot were examined under a dissecting microscope. These faces were chosen because the highest abundance of macroepiphytes was found in this part of the plant in previous studies (Mazzella & Russo, ; Peirano et al., ; van der Ben, ). Animals and macroalgae were identified at species or genus levels.…”

Section: Methodsmentioning

confidence: 99%

Temporal and bathymetric variation of epiphyte cover and leaf biomass in a southern Posidonia oceanica (L.) meadow: the case of Mahdia coast, Tunisia

2016

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The aim of this research was to study spatial and temporal variation in epiphyte cover and leaf biomass of Posidonia oceanica in Eastern Tunisia. Sampling was conducted at four stations on the Mahdia coast during October and December 2010, and April and August 2011, which correspond respectively to autumn, winter, spring and summer in this area. Posidonia oceanica shoots were collected at two depths (5 and 10 m). Cover of macroinvertebrates and macroalgae was estimated on adult leaves. The results showed that leaf and epiphyte biomasses vary significantly according to sampling date, with the highest values recorded in August. We found a high diversity of epiphytic assemblages on the leaves of P. oceanica with clear qualitative and quantitative dominance of Rhodophyceae compared to other groups, followed by Phaeophyceae. Most epiphyte species on the leaves of P. oceanica in Eastern Tunisia are the same as those in other parts of the Mediterranean Sea. No bathymetrical variation in the epiphytic community was found in our study area, which can be explained by the high levels of water clarity in Mahdia.

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“…Many climatic factors have been shown to influence P. oceanica phenology (Peirano et al, 2011). A significant correlation between flowering prevalence and air temperature had already been found (Diaz-Almela et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Flowering of the seagrass Posidonia oceanica in NW Mediterranean: is there a link with solar activity?

et al. 2013

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Time series analysis of the leaf biometry and rhizome production of the endemic Mediterranean seagrass Posidonia oceanica (L.) Delile was performed for a meadow in the Ligurian Sea (NW Mediterranean) in order to assess changes in plant growth during a massive flowering event that occurred in 2003 and coincided with the warmest summer temperatures recorded in the last centuries. P. oceanica exhibited the highest values of leaf surface area during the flowering year and the highest values of rhizome production in the previous year. The years immediately following the flowering event were characterized by a decrease in both parameters. Comparison of the years of massive flowering events reported in the literature for the entire Mediterranean with the historical series (spanning the last 50 years) of air temperature and sunspot number suggests that intense solar activity, and not warmer temperature per se, is likely to be the main trigger of massive Posidonia oceanica flowering events.

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Phenology of the Mediterranean seagrass Posidonia oceanica (L.) Delile: Medium and long-term cycles and climate inferences

Cited by 35 publications

References 54 publications

Temporal and spatial zonation of macroepiphytes on Posidonia oceanica (L.) Delile leaves in a meadow off Tunisia

Temporal and spatial zonation of macroepiphytes on Posidonia oceanica (L.) Delile leaves in a meadow off Tunisia

Temporal and bathymetric variation of epiphyte cover and leaf biomass in a southern Posidonia oceanica (L.) meadow: the case of Mahdia coast, Tunisia

Flowering of the seagrass Posidonia oceanica in NW Mediterranean: is there a link with solar activity?

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