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Auswirkungen der Schleppnetzfischerei auf die größten Mangroven in Flussmündungen und das Offshore-Ökosystem
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ISBN10: 6208878977
ISBN13: 9786208878979
Publisher: Verlag Unser Wissen
Published: Jul 18 2025
Pages: 80
Weight: 0.26
Height: 0.19 Width: 6.00 Depth: 9.00
Language: German
ISBN13: 9786208878979
Publisher: Verlag Unser Wissen
Published: Jul 18 2025
Pages: 80
Weight: 0.26
Height: 0.19 Width: 6.00 Depth: 9.00
Language: German
Vor der Küste Bengalens und in den Flussmündungen ('Sundarbans), dem grö ten Mangroven-Ökosystem (Weltnaturerbe), entwickeln sich riesige Phytoplankton-Reservate als Grundlage des marinen Nahrungsnetzes der Mangroven mit marinen Arten auf höheren trophischen Ebenen. Über den Meeresboden gezogene, nicht selektive Schleppnetze schöpfen die Artenvielfalt des Meeresbodens aus und zerstören den Unterwasserlebensraum der Basisarten. Die Sterblichkeit durch Schleppnetzfischerei führte zum Zusammenbruch der marinen Nahrungspyramide und gefährdet die Hauptkonsumenten, was die Menschen an der Küste noch schlimmer trifft. In der Fischereizone Tajpur-Shankarpur-Digha-Petua verhält sich der Artenreichtum umgekehrt proportional zur Entfernung vor der Küste, was zu einem geringeren Verlust der Artenvielfalt mit zunehmender Tiefe und Startdistanz der Schleppnetze führt. So weist ein flacherer Kontinentalschelf mit maximalen benthischen Nährstoffen eine höhere Schleppnetz-Sterblichkeit auf, was auf einen höheren Verlust der Artenvielfalt hindeutet und umgekehrt. Ständige Sterblichkeit durch Schleppnetzfischerei, Schwermetallverschmutzung in Tiefsee-Schleppnetzfeldern und Ruheplätzen in Flussmündungen sowie die Zerstörung von Mangroven in Flussmündungen führten zu einer Überlebenskrise für alle Spitzenarten, dem Fehlen von Garnelensetzlingen und Meeresschnecken sowie dem Artensterben (Chandana Hilsa).
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