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01.11.2024 | Original Research

Spatial variation of algal diversity due to conversion of mangrove to rice ecology in Sundarban, India

verfasst von: Sujit Kumar Nayak, Pratap Bhattacharyya, Soumya Ranjan Padhy, Anubhav Das, Shiva Prasad Parida

Erschienen in: Biodiversity and Conservation | Ausgabe 1/2025

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Abstract

Der Artikel untersucht die räumliche Variation der Algenvielfalt aufgrund der Umwandlung von Mangroven in Reisökologien in der Sundarban-Region in Indien. Sie untersucht den Einfluss physikalisch-chemischer Parameter wie pH-Wert, elektrische Leitfähigkeit, Salzgehalt und Stickstoffanteile auf die Algenvielfalt. Die Studie untersucht auch die Korrelation zwischen der Mangrovenpflanzendichte und den Algengemeinschaften und deckt signifikante Unterschiede zwischen Mangroven- und Reisökologien auf. Die Ergebnisse unterstreichen die Bedeutung des Schutzes der Mangroven-Ökosysteme für den Erhalt der Algenvielfalt und die Unterstützung der Kohlenstoffspeicherung.

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Abstract

Mangrove is a unique ecosystem in terms of climate change mitigation due to its ability to sequester huge amounts of organic carbon. The organic carbon pools in mangroves’ soils harbor a wide range of microbial communities and support diverse algal communities. However, conversions of mangroves to agriculture (particularly rice-based cropping systems) directly or indirectly influence the algal diversity and abundance in mangroves and adjacent rice ecologies. So, to understand the change of structural algal diversities (from phylum to genus level), a study was conducted through Illumina MiSeq metagenomic analysis using V3–V4 region of 16 S rRNA gene approach of soils both, in degraded mangroves and adjacent rice ecology in Sundarban, India. The abundance reads of algal communities were correlated with the nitrogen fractions and physio-chemical properties of soils. The 16 S rRNA gene sequencing revealed that, irrespective of the sites of the degraded mangroves and rice ecologies in estuarine systems in Sundarban, microalgae were dominant over macroalgae. The higher algal diversities and abundance were found in rice with higher Shannon index (3.14) than mangroves (Shannon index: 2.85). Further, among the mangrove sites, the higher algal diversities were found in the locations distant from the sea than in the sites nearer to the sea. Environmental and soil stresses, like high salinity, alkaline pH, tidal intrusion and limited nutrient availability are the key factors for less algal diversity in degraded mangroves. Specifically, among the microalgae, Nostoc and Calothrix were the dominant genus in rice with higher abundance percentage of 13 and 12%, respectively. Whereas, Leptolyngbya was the dominant genera with higher abundance percentage (15%) in degraded mangroves, followed by Spirulina (13%). The relative abundance of Spirulina was more in degraded mangroves due to their adaptability to higher salinity. Although, the algal diversities were more in rice than mangroves, the higher abundance of Spirulina could be a treasure in the mangrove system for carbon sequestration and climate change mitigation. Therefore, further research on carbon sequestration potential of the dominant algal genus under stress conditions of both mangroves and rice systems need to be conducted to get a better idea on the role of algal communities on climate change mitigation in estuarine systems.

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Vorheriger Artikel Contribution of ruderal herbaceous vegetation to supporting services in Mediterranean urban greenspaces

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Titel: Spatial variation of algal diversity due to conversion of mangrove to rice ecology in Sundarban, India
verfasst von: Sujit Kumar Nayak
Pratap Bhattacharyya
Soumya Ranjan Padhy
Anubhav Das
Shiva Prasad Parida
Publikationsdatum: 01.11.2024
Verlag: Springer Netherlands
Erschienen in: Biodiversity and Conservation / Ausgabe 1/2025
Print ISSN: 0960-3115
Elektronische ISSN: 1572-9710
DOI: https://doi.org/10.1007/s10531-024-02965-z

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