AYYAZ, Muhammad and Hidayat, Jafron Wasiq and Muhammad, Fuad (2023) SALINITY TOLERANCE OF AEGICERAS CORNICULATUMAND CERIOPS TAGAL, IN THE COASTAL AREA OF KARACHI, PAKISTAN. Masters thesis, UNIVERSITAS DIPONEGORO.

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Abstract

Mangrove forests are the main elements that are essential to maintaining ecosystems in harsh environments. These forests stabilize shorelines, maintain water quality, protect against storms and flooding, preserve habitat and biodiversity, offer migratory birds shelter and breeding grounds, prevent seaports and coastlines from eroding due to wave action and siltation, and provide domestic animals with food. The study's goal is to evaluate the mangrove species' resistance to salinity. Propagules of Ceriops tagal (C. tagal) and Aegiceras corniculatum were procured for this purpose from the Indus delta and were cultivated in pots with sandy soil sub- irrigated with 0, 25, and 50% nitrogen-fortified seawater. Six months of experimentation were spent raising seedlings. Although the species of Aegiceras did not do well in the greenhouse, Ceriops tagal's development peaked at a salinity of 25% saltwater and fell as the salinity increased. Additionally, a non-secretor, C. tagal gathered more sodium and chloride ions while severely limiting the availability of other ions. Therefore, this species might certainly be employed to restore intertidal habitats, which regularly get freshwater. The initial propagules weight, size of the propagules, length of the plants, and number of leaves were all measured as seedlings were experimentally cultivated for six months. Maximum growth was seen in 50% seawater, and it got worse as the salinity rose. Additionally, fresh water is provided three times each week to flush out the extra salt content. In a greenhouse setting, it has been found that medium and large-sized propagules perform better than small-sized ones. It is essential that seeds from plants be suited to endure the environmental circumstances in which they spreadand settle if they are to effectively reproduce. The propagules of viviparous mangrove species seem ideal for establishment and spread inside the greenhouse environment.

Keywords: Indus Delta; Aegiceras cornicultum; Ceriops tagal; Salinity; Propagules; Mangroves

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