Page 5 - Calvo_e_al_1995

(Egadi islands) in July 1995 flowering 1l!IC of30'.t. was obsctVed (unpubliShed dll!Jl).

Moreovcr, during tht summer or 1994 high frequence of ripe fruits (unul 4 per

inflo=cnce) was obscrvcd along 1he westem toast of Sicily. At the samc lime.

lcpidocllronolng•cal aoaiysis carried out on onhottopic flowcring rh~omes sincc 1967

did not show prc•·ious flowcrings. confioning that the same rhizome scldom flowers

more !han once and that the in~rval ~twtcn two flowuings is :u !cast lO Y""rs

(PERCENT er al.. 1989).

orDiffcrent foctors plày a rofe on ìllc dyJl9Dlics tbis extremcly complcx phcnomenon

(PERGENT cr al.. 19&9). Aowering and (rujtiog stress could p:utially explaio thc

u:mpornl gap betwun IWO flowcrin.gs in thc same rhizomc.
Preliminary rcsults ob!alned In San Nicola Bay {Palenno) during a reproductive

event, showed that tbe develop~rent of infloresccnce In Posidonia oce(lllit:a inhibits from
!he beginning leai growth ra~ (fOMASELLO et aL, 1995). Morwver. Posid011in ocMnica
flowering signif~cantly nfTcctS boJh imennediate and adult leaf growth (PANAYOTID!S,

1986; PERCENT & PERGENT·MAR11N1. 1988).
In Sicily. however; flowering Md !ruitiog of Posic!Dnia oc~onica are ~uent and can

occur ev"l}' year. E>.ceplionaUy. imposing fTuiting phenomeoa hcrvc ~tn mstificd by off-

shore pa«:hes (10 metre.s in di.:unctcr) or floating !ruits and sttiklng seeds ond plantul•

heaps. banqucJtt-like, on ~ sbore-Une (unpublished obsuvations or !bè authon; nc:u-

Stagnone lagoon- Western coast of Sici'ly - during July 199J). Nevcttbcless. the lower

limi! of the flowering obsc""'.d in SicJ!y docsn't exceed 17 m (fOM&SELLO et al..

1994).

REFERENCES

C.o.t.vo S_ CUL,OLO G.. DI STEFANO C. l< LA LOGGIA G.. 1995 - Mappatura di popola;;io11i

b<-ntichc in tu1fb/ente lagrman mediani~ dilli da tduil~·am~nto. Ani VU Convegno

Nulon>lc A.I.T_ 389->95.
& FliAOA• ORe.nMoo C.. 1984 - 1.'6trbitr tk Pondnnia occunica tb.•J dtu sicilicnM<:
IC'J format,oM rldfalu tW $/agnon~ In! fnL Wor!o..shop on Posidon;n occanlc-a bed$...
llo<Jdourcsquo C.F.. Jeudy d< Gris5:1< A. & Oli•icr J. (c:<k.J, GIS PosidOni• pubi.. Fr.. J·
29-37.
FlUIDA· 0Re$TA!>O C. /!1:; CAr.vo S.. 199! - - L'impatt tkJ a<tMI'S anrlrrOPiqu~s sur Ics
hl!rbi~I'.J d~ PoJidDnitJ at~nica (limuUJtsl IJ~IIIe l~ lortd tfcs cltcs slcilknnes.
Doc:umcru.s Phytoso.:iolo:iques.. 19~ ~21-SJ.I.
GIACCO!<F. G. & So~n"o M.. !97C- ~""~ drlla '"&eta::innr marina ddle is<>l< égod/
(CnnQI< di Si~i/ìuJ. !,:iv, 1St. bo<. Gl:ud. col. l'>krmo. IL. 25: 165-183.
GIRAUO G.. J9n - Bsnl dc c/OUSQnJ:nJ dalro6ias t1L Pt>sidqn/11 t><"eoni<u (l...j/kU/e. Bot.
Mor., W. ~7-491.
MA2ZELU. L .\i.C. GA.\lB~ G.F. Russo & ~LC. Bl'lA. J984 - De.p jloueriq;: and froitit~g "'
Pt>sidonia OC<'<lnlro bds orotmd Jlr~ is/atHJ of /schit> /Gulf of Naples. lta~vf: In: lat.
Worlahop on Posilfotria oreonrco b<ds. Boudoue<squ< C.F.. J<•<ly do! GriS<ac A. &
Ollvicr J. {eds.). GIS Po.idOniè pubi.. Fr~ l 20>-209.
Moli~IER IL & PICARP J~ 1952 - ~rcfo<J sur l(S hcrblers dc phaniragam~s marine> du
l/11ornl méditorranérnfran<ials. Ann.ln.st.<ki>nogr_ Porls. Fr.. 27 (li: IS7-23ob
& - . 1953 3 - EJu.th1 biologiquu sur /q- hubiuJ d~ Phouirogomu marinrs Q I'Ouc.s'
d'AJ~r- Bull. Sroi. Aqnic..., P.khe, CUiiglio,.,.. Al~mc. •: 7·3•.
& - , 1953 b - Nota bi'ol<>siqua /J prop<n d'un ''".''0!1~ <fétvde surlts cius de Sicile.
Ann. 11\SL Océ:lnogr., Paris, l't_ 28 (4): 163·188.
PANA'o'OTIPI$ P.. 1986- l!>f/uer.ce de fa floraison wr le t:)'Cic dc II!IIOU\'tlll!dlent des f•uilles
de Palidania O«<nic" (L) De/l/e, datU le &t>lfc d~ Sata•ikos (Mu E~te, Gr<ceJ. Rnpp.
Comrn. inL Mor. Mt<lit.. lO (2): 6.
PEI«;ENT G. & i'IOltCE~T-MAAn~1 C.. 1988- Phhrol<>sie de Posid<mia ouanico (Untuuus)

Dclile dam le buJtir. médit~ill. Ann. lnst. 0..~.. P:lris, Fr.. 64 (21: 79·100.

GIORNALE BOTAI'o1CO ITALIANO- VOLUME 121>. l, 1995