Preprint volume - SIBM

Pre-print Volume – Posters
Topic 3: INTEGRATED COASTAL ZONE MANAGEMENT
Conclusions – Preliminary results highlighted some differences between the two
meadows, probably linked to the local environmental features. According to the well
known role of the light for the distribution and growth of the species, the variation of
some morpho-ecological and phenological traits in the two investigated P. oceanica
sites can be mostly related to the different light intensity value as recorded at the
respective -15 m depth stations. The water temperature, the average value higher in the
Porto Cesareo meadow, can be another driver. The results agree with the information
from the scientific literature, describing the Southern Adriatic Sea and the North-
Eastern Ionian Sea quite different basins (oceanographic characteristics, trophic level)
(Cardellicchio et al., 1993; Vilicic et al., 1995; Marano et al., 1998). Notwithstanding,
the apparently stressed condition highlighted in the Tremiti Islands meadow needs
further investigation on the impact of human activities occurring in marine areas under
Tab. 1 - Bio-ecological data for the two P. oceanica investigated m eadow s
Dati bio-ecologici relativi alle due praterie di P. oceanica indagate.
C o o rd ina tes (° ' '' W G S 8 4 ) N42 07 01.2 E015 29 51.9 N40 12 21.5 E017 54 30.0
Sam pling date 16 oct 2008 23 sept 2009 18 oct 2008 14 nov 2009
Density (shoots m -2 ) 135 163 225 234
Cover (% ) 60 70 80 70
Low er limit depth (m )
Interm ediate leaf m ean leng th (cm ) 19.7 21.8 16.4 19.9
Interm ediate leaf m ean w idth (cm ) 1.0 1.0 0.9 0.9
A d ult leaf m ean len gth (cm ) 49.1 45.7 43.2 39.1
Adult leaf m ean w idth (cm ) 0.9 1.0 0.9 0.9
Sh ealts m ean leng th (cm ) 3.4 3.1 4.7 4.6
To tal coeff. "A " (% ) 38.0 39.5 26.2 15.5
Leaf surface (cm 2 shoot -1 ) 123.6 145.8 130.7 149.8
Leaf biom ass (g d.w . shoot -1 ) 0.591 0.672 0.818 0.600
Leaf A rea Index (L A I) (m 2 m -2 ) 1.7 2.4 2.9 3.5
Leaf Standing Crop (LSC) (g d.w. m -2 ) 80.1 109.3 184.1 140.3
Epiphytes biomass (g d.w. shoot-1) 0.152 0.333 0.044 0.012
LFR (no. of leaves shoot -1 year -1 ) 6.0 6.1 5.6 6.5
RhP (R hizom e Production g d.w . year -1 ) 0.083 0.064 0.080 0.073
RhER (Rhizom e Elongation R ate cm year -1 ) 1.07 0.75 0.92 0.78
R hizo m e m ean full length (cm ) 9.6 6.4 1 0.3 8.9
No. lepidochronological years on average examinated
Sediment analysis
9 7 1 2 8
T .O .C . (T ota l O rga n ic C a rb on m g .k g -1 Posidonia oceanica m onitoring station (-15m depth)
Param eters
T rem iti Islan ds P orto C esa reo
(S. Domino - P.ta Spido) (S. Isidoro Tower)
21 29
) -