Wfd coast: Mediterranean eco-region


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  • Maria Cristina BUIA
  • Stazione Zoologica ‘A. Dohrn’ - Napoli
  • Copenhagen, 20-21 November 2006
  • EEA - EMMA Workshop
  • Practical case study on data flow comparability and stremlining
  • of marine biodiversity assessments for seagrasses

Why are seagrasses been chosen among phytobenthic organisms?

  • Their wide geographical distribution
  • Their relevant role, both structural and functional, in marine coastal waters
  • Their longevity (species dipendent)
  • Their ability to be a biological tracer
  • Their “regression”
  • all over the world (temporal scale)
  • Cymodocea nodosa
  • Zostera marina
  • Zostera noltii
  • Halophila stipulacea
  • Mediterranean Seagrasses
  • Different maximum depth distribution
  • Z. marina
  • Z. noltii
  • 6m
  • 7m
  • 30m
  • 42m
  • 48m
  • C. nodosa
  • P. oceanica
  • H. stipulacea
  • Different substrate condition
  • silt
  • rock
  • sand
  • Z. marina
  • Z. noltii
  • C. nodosa
  • Halophila
  • P. oceanica
  • It has been chosen as representative of mediterranean angiosperms because
  • is an endemic species
  • its wide distribution (25,000 - 50,000 Km2 = 25% coastal area between 0 and 48m depth)
  • its sensitivity and response to disturbance (a wide decline seems to be taking place in the Mediterranean basin)
  • the existing knowledge
  • Why only Posidonia?
  • Lower limit depth
  • Evaluation
  • < 15 m
  • Turbid waters
  • > 15 m and < 25 m
  • Only slight transparency
  • > 25 m and < 35 m
  • Transparent waters
  • > 35 m
  • Evaluation scale of water transparency as a function of mean depth
  • of the P. oceanica lower limit
  • Which metrics can be used as indicator?
  • ( Pergent et al., 1995)
  • Prof
  • AD
  •  
  • LSD
  •  
  • DN
  •  
  • DE
  • 1
  • 822
  • 934
  • 1158
  • 2
  • 646
  • 758
  • 982
  • 3
  • 543
  • 655
  • 879
  • 4
  • 470
  • 582
  • 806
  • 5
  • 413
  • 525
  • 749
  • 6
  • 367
  • 479
  • 703
  • 7
  • 327
  • 439
  • 663
  • 8
  • 294
  • 406
  • 630
  • 9
  • 264
  • 376
  • 600
  • 10
  • 237
  • 349
  • 573
  • AD
  • LSD
  • ND
  • HSD
  • Pergent- Martini et al., 1999
  • e.i. 600 sh/m2
  • Different classification systems have been proposed:
  • POMI (Catalunya)
  • (Romero et al, 2005)
  • POSWARE (Italy)
  • (Buia et al, 2005)
  • French system
  • (Pergent-Martini 2006)
  • Different descriptors
  • Different analytical methods
  • Maltese system
  • (Debono & Borg, 2006)
  • Valencian system
  • What is the current stage of development/application of the indicator?
  • Classification systems of MS
  • Fuzzy
  • Although the classification systems are similar in concept, they differ on many aspects, such as the choice of descriptors, the data analysis methods and the Reference Conditions

What are the data needs?

  • Depth and season are relevant in the classificiation systems
  • In some classification, descriptors subjected to seasonal variability were excluded to reduce errors.
  • The high variety of descriptors in other classifications increases the complexity of sampling and analytical methods.
  • Description of different methods

Other processes looking at seagrasses: National Monitoring Programmes

  • 50 Km
  • P. Mesco
  • Antignano
  • Carbonifera
  • Cogoleto
  • Imperia
  • Capo Bianco
  • P. Licosa
  • P. Tresino
  • Since 1984 in 24 sites - since 1994 33 sites
  • Since 2004 – Corsican PMN
  • 30 sites in 2007 May-July
  • Since 2002 in 8 sites from 17 to 33m depth
  • March
  • Since 2002
  • in 20-25-30 sites
  • September

Can the indicator be used for the EMS/MSD implementation process?

  • The ‘Posidonia indicator’ can be used for all the mediterranean region
  • In relation to the ecological and geographical features of the different seagrasses,
  • some criteria ( ‘batymetric extension’, density and plant production) can be used
  • at the Pan European level
  • It is applicable
  • Is is applicable to offshore waters?
  • Depends on the bottom topography and to the species distribution.
  • Thank you for your attention!


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