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

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Abstract

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.

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Acknowledgements

We are grateful to Rocío Santiago, Regino Martínez and Catalina Arrondo for their participation in field and lab work and to Amparo Lázaro and Javier Rodríguez for instructive discussions and suggestions for data analysis. This research has been funded by the EU projects M&M’s (EVK3-CT-2000-00044 and REN-2000-3091-CE/MAR) and LIFE-Posidonia (LIFE 2000/NAT/E/7303) and by the Spanish National Programme of Research in Protected Areas (MAM/2484/0055/2002). E. Diaz-Almela was supported by a Ph.D fellowship from the regional government of the Balearic Islands (Spain). All samplings were performed complying with the current national and European laws for protected species.

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Authors and Affiliations

  1. IMEDEA (CSIC-UIB), Grupo de Oceanografía Interdisciplinar, C/Miquel Marqués n° 21, 07190, Esporles, Spain

    Elena Diaz-Almela, Nuria Marbà & Carlos M. Duarte

  2. Direcció General de Pesca, Palma de Mallorca, Palma de Mallorca, 07006, Baleares, Spain

    Elvira Álvarez

  3. Dipartamento di Scienze dell’Uomo e dell’Ambiente, 6, I-56126, Pisa, Italy

    Elena Balestri

  4. Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Murcia, C/ Varadero n°1 CP: 30740, San Pedro del Pinatar, Murcia, Spain

    Juan M. Ruiz-Fernández

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  1. Elena Diaz-Almela
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  2. Nuria Marbà
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  3. Elvira Álvarez
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  4. Elena Balestri
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Correspondence to Elena Diaz-Almela.

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Communicated by S. A. Poulet, Roscoff

Appendix

Appendix

Table 4, Table 5, Table 6, Table 7, Table 8, Table 9, Table 10

Table 4 Flowering temporal series from Italy
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Table 5 Flowering temporal reconstructive series from Mallorca island
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Table 6 Flowering temporal reconstructive series from Cabrera Island
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Table 7 Flowering temporal reconstructive series from Ibiza and Formentera islands (Pitiusas)
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Table 8 Flowering temporal reconstructive series from North-East Iberian peninsula (Spain)
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Table 9 Flowering temporal reconstructive series from South-East Iberian peninsula (Spain)
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Table 10 Particular records obtained from direct observation between 1992 and 2004
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Diaz-Almela, E., Marbà, N., Álvarez, E. et al. Patterns of seagrass (Posidonia oceanica) flowering in the Western Mediterranean. Marine Biology 148, 723–742 (2006). https://doi.org/10.1007/s00227-005-0127-x

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