Abstract
Monitoring the extension of seagrass meadows over time is of primary importance for the surveillance of marine coastal biodiversity. Here, we analyse the evolution of the meadow of Cymodocea nodosa in the Gulf of Tigullio, a coastal tract of naturalistic interest but subjected to high anthropogenic pressure. Historical maps at a scale 1:25,000 of C. nodosa meadow drawn in 1986, 1991 and 2001 were processed with GIS (Geographical Information System), using overlay vector methods. Diachronic analyses allowed the measurements of temporal changes, in term of percentage gain or loss of meadow extension, through concordance and discordance maps. A general increase in the extension of the meadow from 1986 to 1991 was evidenced, but the disparity of mapping methods (SCUBA diving in 1986, Side Scan Sonar in 1991) in the two surveys imposes caution when interpreting this result. On the other hand, the comparison of 1991 and 2001 maps, both derived from Side Scan Sonar surveys, showed a regression of the meadow of about 60% in the northern area, and modifications in the upper and lower limits of the meadow due to the impact of coastal works. C. nodosa meadow showed the only enlargement in front of the mouth of the Entella River, due to the increase in nutrient contents for rainfall in the period 1988–1994. The overall analysis evidenced a net decrease in seagrass meadow extension, an early warning of risk for marine coastal biodiversity in the Gulf of Tigullio.
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References
Aliani, S., C. N. Bianchi, S. Cocito, P. R. Dando, R. Meloni, C. Morri, A. Niemeyer, A. Peirano & W. Ziebis, 1998. A map of seagrass meadows in Palaechori Bay (Milos Island, Greece), a marine area with hydrothermal activity. Rapports et Procès-Verbaux des Réunions de la Commission Internationale pour l’Exploration Scientifique de la Mer Méditerranée 35(2): 512–513.
Barsanti, M., A. Peirano, S. Sgorbini, S. Cocito, C.N. Bianchi & C. Morri, 2003. Rilevamento dei prati di Cymodocea nodosa mediante Side Scan Sonar, ROV ed immersioni subacquee: area costiera-marina tra Chiavari e Sestri Levante. In Studi per la creazione di strumenti di gestione costiera: Golfo del Tigullio. ENEA, Centro Ricerche Ambiente Marino, La Spezia—Ministero Ambiente e Tutela del Territorio, 141–155.
Bianchi, C. N., 2002. Il monitoraggio della biodiversità nelle Aree Marine Protette: considerazioni scientifiche e metodologiche. Notiziario della Società Italiana di Biologia Marina 41: 89–95.
Bianchi, C. N. & C. Morri, 2000. Marine biodiversity of the Mediterranean Sea: situation, problems and prospects for future research. Marine Pollution Bulletin 40(5): 367–376.
Bianchi, C. N. & A. Peirano, 1995. Atlante delle fanerogame marine della Liguria: Posidonia oceanica e Cymodocea nodosa. ENEA. Centro Ricerche Ambiente Marino, La Spezia, 1–146.
Bruno, J. F., J. J. Stachowicz & M. D. Bertness, 2003. Inclusion of facilitation into ecological theory. Trends in Ecology and Evolution 18: 119–125.
Buia, M. C., M. C. Gambi & M. Dappiano, 2004. Seagrass system. Biologia Marina Mediterranea 10(suppl.): 133–183.
Buia, M. C., M. C. Gambi & V. Zupo, 2000. Structure and functioning of Mediterranean seagrass ecosystems: an overview. Biologia Marina Mediterranea 7(2): 167–190.
Cancemi, G., M. C. Buia & L. Mazzella, 2002. Structure and growth dynamics of Cymodocea nodosa meadows. Scientia Marina 66(4): 365–373.
Cebrián, J., M. F. Pedersen, K. D. Kroeger & I. Valiela, 2000. Fate of production of the seagrass Cymodocea nodosa in different stages of meadow formation. Marine Ecology Progress Series 204: 119–130.
Ceccherelli, G. & F. Cinelli, 1997. Short-term effects of nutrient enrichment of the sediment and interactions between the seagrass Cymodocea nodosa and the introduced green alga Caulerpa taxifolia in a Mediterranean bay. Journal of Experimental Marine Biology and Ecology 217: 165–177.
Cortemiglia, G. C., 1978. Le modificazioni dell’assetto strutturale del litorale di Lavagna quale fattore erosivo della spiaggia. Memorie della Società Geologica Italiana 19: 369–380.
Cortemiglia, G. C., 1987. Evoluzione della piana di Sestri Levante (Liguria Orientale) dal secolo XVIII d.c. alla situazione attuale. Geografia Fisica e Dinamica del Quaternario 10: 122–131.
Delbono I., C. N. Bianchi, C. Morri & A. Peirano, 2003. Influenza della tessitura dei sedimenti e dei fenomeni erosivi nella distribuzione del prato di Cymodocea nodosa nel tratto di litorale compreso fra Chiavari e Sestri Levante. In Studi per la creazione di strumenti di gestione costiera: Golfo del Tigullio. ENEA, Centro Ricerche Ambiente Marino, La Spezia—Ministero Ambiente e Tutela del Territorio, 121–129.
Den Hartog C., 1970 The Seagrasses of the World. Amsterdam, Verhandelingen der Koninklijke Nederlandse Akademie van Wetenschappen Afdeling Natuurkunde, 1–275.
Duarte, C. M., 2000. Marine biodiversity and ecosystem services: an elusive link. Journal of Experimental Marine Biology and Ecology 250: 117–131.
Duarte, C. M., 2002. The future of seagrass meadows. Environmental Conservation 29(2): 192–206.
Duarte, C. M. & C. L. Chiscano, 1999. Seagrass biomass and production: a reassessment. Aquatic Botany 65: 159–174.
Duarte, C. M. & K. Sand-Jensen, 1990a. Seagrass colonisation: patch formation and patch growth in Cymodocea nodosa. Marine Ecology Progress Series 65: 193–200.
Duarte, C. M. & K. Sand-Jensen, 1990b. Seagrass colonisation: biomass development and shoot demography in Cymodocea nodosa. Marine Ecology Progress Series 67: 93–103.
Duarte, C. M. & K. Sand-Jensen, 1996. Nutrient constraints on the establishment from seed and on vegetative expansion of the Mediterranean seagrass Cymodocea nodosa. Aquatic Botany 54: 279–286.
ENEA, 1997. Realizzazione di un sistema integrato di difesa dall’inquinamento delle acque marine costiere del Golfo Tigullio e del Golfo Paradiso. ENEA, La Spezia Rapporto Tecnico Ambiente.
Furnari, G., G. Giaccone, M. Cormaci, G. Alongi & D. Serio, 2003. Biodiversità marina delle coste italiane: catalogo del macrofitobenthos. Biologia Marina Mediterranea 10(1): 1–482.
Guidetti, P., M. C. Buia, M. Lorenti, M. B. Scipione, V. Zupo & L. Mazzella, 2001. Seasonal trends in the Adriatic seagrass communities of Posidonia oceanica (L.) Delile, Cymodocea nodosa (Ucria) Ascherson, Zostera marina L.: plant phenology, biomass partitioning, elemental composition and faunal features. In Faranda F., L. Guglielmo & G. C. Spezie (eds.), Mediterranean Ecosystems: Structures and Processes. Springer, Milano, 289–295.
ISTAT, 2000. Statistiche Metereologiche. Annuari 1986–2000. ISTAT, Roma.
Leriche, A., C. F. Boudouresque, B. Guillaume, P. Bonhomme & J. Denis, 2004. A one-century suite of seagrass bed maps: can we trust ancient maps? Estuarine, Coast and Shelf Science 59: 353–362.
Marbà, N., J. Cebrián, S. Enríquez & C. M. Duarte, 1994. Migration of large-scale subaqueous bedforms measured with seagrasses (Cymodocea nodosa) as tracers. Limnology and Oceanography 39(1): 126–133.
Morri, C., C. N. Bianchi, V. Damiani, A. Peirano, G. Romeo & L. Tunesi, 1988. L’ambiente marino tra Punta della Chiappa e Sestri Levante (Mar Ligure): profilo ecotipologico e proposta di carta bionomica. Bollettino dei Musei e degli Istituti Biologici dell’Università di Genova 52(Suppl.1986): 213–231.
Peirano, A. & C. N. Bianchi, 1997. Decline of the seagrass Posidonia oceanica in response to environmental disturbance: a simulation-like approach off Liguria (NW Mediterranean Sea). In Hawkins L. E. & S. Hutchinson (eds), The response of marine organisms to their environments. University of Southampton, UK, 87–95.
Pergent, G, C. Pergent-Martini & C. F. Boudouresque, 1995. Utilisation de l’herbier à Posidonia oceanica comme indicateur biologique de la qualité du milieu littoral en Méditerranée: état des connaissances. Mesogée 54: 3–27.
Relini, G., 2000. Nuovi contributi per la conservazione della biodiversità marina in Mediterraneo. Biologia Marina Mediterranea 7(3): 173–211.
Short, F. T., R. G. Coles & C. Pergent-Martini, 2001 Global seagrass distribution. In Short F. T. & R. G. Coles (eds), Global seagrass research methods. Elsevier Science, Amsterdam, 5–30.
Tunesi, L., M. E. Piccione & S. Agnesi, 2002. Progetto pilota di cartografia bionomica dell’ambiente marino costiero della Liguria. Proposta di un Sistema Informativo Geografico per la gestione di cartografie bionomiche e sedimentologiche. Quaderni ICRAM 2: 1–112.
Wabnitz C., M. Taylor, E. Green & T. Razak, 2003. From Ocean to Aquarium. UNEP-WCMC Biodiversity Series No 17, Cambridge, UK: 1–66.
Acknowledgement
The authors wish to thank Olivia Vannello (Genoa) for her contribution in GIS maps production and analysis.
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Barsanti, M., Delbono, I., Ferretti, O. et al. Measuring change of Mediterranean coastal biodiversity: diachronic mapping of the meadow of the seagrass Cymodocea nodosa (Ucria) Ascherson in the Gulf of Tigullio (Ligurian Sea, NW Mediterranean). Hydrobiologia 580, 35–41 (2007). https://doi.org/10.1007/s10750-006-0467-7
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DOI: https://doi.org/10.1007/s10750-006-0467-7