Patterns of seagrass (Posidonia oceanica) flowering in the Western Mediterranean

By Elena Díaz-Almela, N. Marbà, Elvira Álvarez, E. Balestri, J. Ruiz-Fernández, Carlos M. Duarte. 2006

98 citations recorded by the source corpus.

The intensive reconstructive sampling (1957–2004, 39 localities), a systematic direct observation (1992–2004, 1 locality) and particular direct observations (66 localities) of Posidonia oceanica meadows were analysed together with temporal series of flowering available in the literature (19 localities). This allowed the examination of temporal and spatial variability in annual flowering prevalence (FP, the fraction of meadows flowering in a given year) and of annual meadow flowering intensity (FI, number of inflorescences per shoot) for the period 1979–2004 across the Western Mediterranean, as well as spatial variability of flowering frequency (FF, the fraction of years that a given meadow has flowered) and shoot flowering probability (Pf, fraction of flowering stalks appeared per annual segment). Each year, on an average 17% of the investigated meadows flowered, ranging from 3 to 86% of meadows among the years. The highest annual FP and FI values were obtained in 2003 (FP=0.86 and mean FI=0.23±0.03 inflorescences shoot−1). A secondary peak of FP and mean FI occurred 9 years earlier, in 1994 (FP=0.44 and mean FI=0.08±0.02). Both peaks of flowering occurred after hot summers. Flowering synchrony in particular years across the Western Mediterranean and clines of increased meadow flowering frequency towards the North and East, suggests the existence of large-scale environmental mechanisms controlling the floral induction. On the other hand, meadow FF and Pf were highly heterogeneous among and within the meadows, indicating that local factors also may play a significant role in flowering induction. When flowering, the Western Mediterranean meadows showed an average 0.11±0.02 inflorescences shoot−1, but FI greatly varied among and along the series (from 0.002 to 0.54 inflorescences shoot−1) and decreased significantly with depth but was independent of meadow shoot density and meadow latitude or longitude. The shoot flowering probability was quite low (0.007±0.002 inflorescences shoot−1 year−1) and exponentially increased with shoot age.

Subfields: Ecology, Ecology, Evolution, Behavior and Systematics, Oceanography

View Paper: https://www.semanticscholar.org/paper/6681aa3833e4db74bd99ce43ed58380ef86e90bd

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In Ecology

In Ecology, Evolution, Behavior and Systematics

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Citations in the corpus

Vicariance patterns in the Mediterranean Sea: east–west cleavage and low dispersal in the endemic seagrass Posidonia oceanica (2007, background): “Moreover, sparse sexual reproduction (Marbà et al., 2002; Balestri & Cinelli, 2003; Diaz-Almela et al., 2006) or alternative reproductive modalities (Ballesteros et al., 2005), together with the possible variance in reproductive success due to dominance of certain clones (both linked to size…”
Contribution of genetics and genomics to seagrass biology and conservation (2007, background): “In any case, slow rhizomatous growth rates, low rates of sexual reproduction and seedling establishment (Procaccini et al., 2003; Diaz-Almela et al., 2006) suggest that these meadows can preserve their genotypic composition for a very long time.”
The Central Role of Dispersal in the Maintenance and Persistence of Seagrass Populations (2011, background): “However, abnormally high sea temperatures can alter this pattern dramatically by inducing the onset of flowering in Posidonia oceanica (Diaz-Almela et al. 2006).”