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L'impatto della pesca a strascico sulle più grandi mangrovie estuariane e sull'ecosistema offshore
Paperback
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ISBN10: 6208879043
ISBN13: 9786208879044
Publisher: Edizioni Sapienza
Published: Jul 17 2025
Pages: 76
Weight: 0.25
Height: 0.18 Width: 6.00 Depth: 9.00
Language: Italian
ISBN13: 9786208879044
Publisher: Edizioni Sapienza
Published: Jul 17 2025
Pages: 76
Weight: 0.25
Height: 0.18 Width: 6.00 Depth: 9.00
Language: Italian
Il Bengala al largo e gli estuari ('Sundarbans), il più grande ecosistema di mangrovie (Patrimonio dell'Umanità ), sviluppa un'enorme riserva di fitoplancton come base della rete alimentare marina delle mangrovie, con specie marine a livelli trofici più elevati. Le reti a strascico non selettive trascinate sul fondale oceanico asportano la biodiversità del fondale marino, distruggendo l'habitat sottomarino delle specie di base. La mortalità da pesca a strascico ha iniziato a far crollare la piramide alimentare marina, mettendo a rischio i consumatori principali e peggiorando gli esseri umani costieri. La zona di pesca Tajpur-Shankarpur-Digha-Petua ha dimostrato che la ricchezza di biodiversità è inversamente proporzionale alla distanza dalla costa, con conseguente diminuzione della perdita di biodiversità con l'aumentare della profondità e della distanza di partenza della pesca a strascico. Pertanto, una piattaforma continentale meno profonda con il massimo contenuto di nutrienti bentonici mostra una maggiore mortalità da pesca a strascico, che indica una maggiore perdita di biodiversità e viceversa. La continua mortalità da pesca a strascico, l'inquinamento da metalli pesanti nei campi di pesca a strascico in acque profonde e nei punti di sosta degli estuari, la distruzione delle mangrovie degli estuari hanno causato una crisi di sopravvivenza per tutte le specie apicali, l'assenza di piantine di gamberi e di conchiglie di mare, l'estinzione delle specie (Chandana Hilsa).
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