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biological diversity and tropical forests in tunisia - PART

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species appear<strong>in</strong>g at this stage <strong>in</strong>clude:<br />

Echium plantagsneum Campanula dichotoma<br />

Paronychka echknata Calycotome villosa<br />

Sklene gallica Rubsa peregrkna<br />

Cichoiam <strong>in</strong>tybus Polypodkum vulgare<br />

Allium roseum Trklax apula<br />

A. pallens Ammi: majus<br />

Frequent disruptions to the ecosystems set back the successfonal<br />

stages <strong>and</strong> <strong>in</strong>sularity <strong>and</strong> other <strong>in</strong>fluences prevent establishment of the<br />

Quercus ilex climax forest. More xerothermkc locatfons are occupked by<br />

-<br />

Olea europaea - Pistacia lentiscus (or 0lea-lentiscus) formations.<br />

europaea has survived only 3x1 the most xerothermsc sites (c.30 ha), so<br />

most stacds are dom<strong>in</strong>ated only by Pistacia lentkscus (more than 140 ha).<br />

Olea-lentiscus formations occupy a belt 50 - 350 m wide between the lowest<br />

lkmit of the Quercus ilex type formatkons <strong>and</strong> the halophile zone along the<br />

sea. Spacias associated with the formation <strong>in</strong>clude:<br />

Galactilis tomentosa Euphorbia peplis<br />

Hyosaris radiata Jun2perus Phoenicia<br />

T Brassica cratica atlantica Ruta chalepensis<br />

Avia tenorii Rapistrum rugosum<br />

Carex divisa Brisa maxfma<br />

Capparis sp<strong>in</strong>osa Dactlyh glomerata<br />

Prasium majus Medscago hispida<br />

Alocg tha shora of Zembra <strong>and</strong> over most of Zembretta is a littoral<br />

zoce subjected to sea water spray, which favors halophile vegetation.<br />

This zone is 50 - 100 m wide on Zembra <strong>and</strong> extends up to 50 m kn altitude,<br />

cover<strong>in</strong>g a total of 80 ha. The halophile vegetation is typkfied by:<br />

acd accompaciad by<br />

Crithmum maritimum<br />

Inula crithmoidas<br />

Se~ecio crassifolius<br />

r Senecio c<strong>in</strong>eraria typicus<br />

Urg<strong>in</strong>ea maritima<br />

r Erodium maritkmwn<br />

Cakile aegyptia T<br />

Polygonum maritimum rT<br />

Polypogon maritimus<br />

Iberis semperf lorus<br />

The rema<strong>in</strong>der of Zembretta, around the<br />

Pistacia lectiscus<br />

Olea europaea<br />

r = Rare<br />

T = Tunisia E~demic<br />

Statice vsrgata<br />

S. echioides<br />

Lotus allkonii<br />

Fumaria capreclata<br />

Mesembryanthemem crkstall<strong>in</strong>um<br />

Atriplex patula<br />

Scabs osa far<strong>in</strong>osa<br />

Dkanthus rupicole hermaensfs<br />

Brassica cretkca atlantica<br />

Erodfum chium<br />

lighthouse is occupied by<br />

Phkllyrea angustffolfa<br />

Chamaerops humilis

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