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Portale dedicato al Convitto - Casa dello Studente "Michele Di Sangro" San Severo FG - Scoperta del territorio: Lesina

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Scoperta del territorio: Lesina
- Ambiente e Territorio - 53 visite
29 aprile 2010
Giornata dedicata al Progetto "Scoperta del Territorio"
Lesina (Marina, Laguna e Bosco Isola)



....................Bosco Isola............................................ Laguna..........................................................Le Pietre Nere............

Giovedì 29 aprile i convittori hanno usufruito di una giornata di relax e di approfondimento attraverso il Progetto “Scoperta del Territorio” che ha avuto per oggetto la zona di Lesina.

“[...]la località di Marina di Lesina, a pochi chilometri dall’abitato del comune di Lesina, tra l'omonimo Lago di Lesina e l'Adriatico, è divenuta negli ultimi anni uno dei siti balneari più frequentati del Gargano. Situata sulla macchia mediterranea, in riva al mare, conserva intatto tutto il fascino selvaggio delle dune coperte di aromi e spezie della vasta pineta e della laguna.
Il lago, che più propriamente bisognerebbe chiamare laguna, ha una forma allungata parallela alla costa; è lungo ventidue chilometri e largo da circa due a un massimo di tre; la sua profondità raggiunge solo in qualche punto il metro e mezzo; la composizione delle sue acque, generalmente è molto simile a quella del mare. Mutamenti notevoli, però, possono essere causati dalle piogge e dall'evaporazione estiva, oltre che dall'attività dei corsi d'acqua dolce che in essa si riversano. Il lago è chiuso da sponde bassissime ed è separato dal mare da un cordone litoraneo coperto di vegetazione, detto Bosco Isola, sul quale è sorto l'insediamento turistico di Marina di Lesina. L’Oasi del Bosco Isola di Lesina ricopre una superficie di 18 ettari e racchiude le varie tipologie di habitat tipici degli ambienti retrodunali marini.
E’ dotata di un sentiero natura attrezzato per le visite guidate e la fruizione didattica ed educativa.
Grazie all'umidità caratteristica del suo ambiente, la laguna di Lesina è considerata un biotopo di particolare pregio naturalistico, adatto alla sosta ed al rifugio di numerose specie di uccelli migratori. Ne sono state contate 200, di cui 69 legate alla laguna per necessità riproduttive. Simili concentrazioni si possono trovare solo sul delta del Po o in quelli dei grandi fiumi del Nord Africa o del Sud Europa. Le specie più importanti: il Gabbiano roseo, il Cavaliere d'Italia, la Garzetta, la Spatola, il Falco di palude, il Fraticello, il Mignattaio, l'Avocetta, il Beccapesci, il Mignattino ed il Martin pescatore il Germano maschio o femmina, il Moriglione, la Volpòca, l'Alzavola, la Gallinella, la Gru, l'Airone, la Folaga.
Quanto alle specie acquatiche è naturale trovare specie dominanti che gradiscono esclusivamente ambienti dolcificati (zone centro-orientali e a sud) come lo spinarello e la carpa, oppure specie che preferiscono ambienti prevalentemente salini o più simili al mare (zone vicine ai canali) come triglia, soleide, sarago, occhiata. Esistono, poi, specie che si possono trovare in tutte le zone della laguna cefali, branzini, orata e latterino. Altre specie osservabili quasi esclusivamente nel periodo della montata sono i rombi, l'aguglia, il gronco, la sardina, l'alice.
Vivono nella laguna anche dei crostacei, come il Penaeus kerathurus (mazzancolla), che raggiunge le misure di 12 - 14 grammi, e nel passato, grazie alle semine effettuate dal Consiglio Nazionale delle Ricerche, che è presente sul posto con l'Istituto per lo Sfruttamento Biologico delle Lagune, un'altra varietà, il japonicus (mazzancolla asiatica), ha mostrato buone capacità di adattamento.
Discorso a parte, invece, è quello relativo alle anguille che popolano il bacino lesinese. Ne esistono due specie: quella maretica e quella pantanina. Le maretiche sono quelle che sovrintendono alla propagazione della specie, disposte anche ad emigrare per tale scopo. Il loro peso può raggiungere anche i tre chili. Le anguille pantanine, invece, non mostrano nemmeno la tendenza al viaggio in mare, sono quindi le anguille sedentarie che non hanno raggiunto lo stato di maturità necessario alla propagazione della specie.[...] con un invito a visitare Lesina e il suo territorio; le attrattive sono diverse, non solo naturalistiche e ambientali: il borgo vecchio con la sua imponente Cattedrale ed il palazzo Vescovile risalente al 1200, la Casa del Pescatore (Museo etnografico della città di Lesina), le Pietre Nere (gruppo di rocce risalenti alla preistoria) e, grazie ad un punto di imbarco è possibile fare un giro sul lago potendone ammirare le bellezze naturali e tante curiosità: l’isolotto di San Clemente posto ad un centinaio di metri dalla riva a ricordo di un antico monastero, i sandali (imbarcazioni tipiche a fondo piatto e vela quadrata), le marotte (recipienti in legno immersi in acqua e ricoperti di rete metallica dentro cui vengono poste le anguille)..."

da un articolo sul giornale di Convitto "Il Mosaico"












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