Biodegraders of large woody debris across a tidal gradient in an Indonesian mangrove ecosystem

Hendy, Ian W.; Shipway, J. Reuben; Tupper, Mark; Green Etxabe, Amaia; Ward, Raymond D.; Cragg, Simon M.. 2022 Biodegraders of large woody debris across a tidal gradient in an Indonesian mangrove ecosystem. Frontiers in Forests and Global Change, 5, 852217. 14, pp. 10.3389/ffgc.2022.852217

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Abstract/Summary

There has been limited research on the breakdown, recycling, and flux of carbon from large woody detritus (LWD) in mangrove forests. The breakdown of LWD is caused by guilds of terrestrial and marine biodegrading organisms that degrade wood at a range of rates and efficiencies. Spatial variations in environmental factors within mangroves affect the distribution and community of biodegrading organisms, which, in turn, impacts carbon flow and sequestration. We reveal the role of biodegrading organisms in LWD breakdown and the environmental factors that influence the distribution of biodegrading guilds within a mangrove forest in South East Sulawesi that supports a diversity of mangrove species typical of Indonesian mangrove forests, which constitute 20% of Global mangrove cover. Within the high intertidal regions, terrestrial biodegradation processes dominated upon LWD. After 12 months exposure on the forest floor, experimental wooden panels in these areas remained unchanged in mass and condition. In the low intertidal region, marine wood-boring animals belonging to the family Teredinidae were the dominant biodegraders of LWD, and their activity reduces LWD volume and speeds up the loss of LWD volume. More than 50% of the experimental wooden panels’ weight in these areas was lost after 12 months exposure on the forest floor. Although different biodegrading guilds occupy the same LWD niche, their distribution throughout the mangrove forest is influenced by inundation time. The change of biodegrading guilds within LWD between the terrestrial and the marine organisms was distinct, creating a biodegradation boundary in a distance as narrow as 1 m on the mangrove forest floor. These results are important, as rising sea levels have crucial implications for biodegrading guilds. A full understanding of factors affecting the biodegradation processes of LWD in mangrove forests is critical to accurately assess mangrove carbon stores and the fate of mangrove derived carbon.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.3389/ffgc.2022.852217
UKCEH and CEH Sections/Science Areas:	Pollution (Science Area 2017-)
ISSN:	2624-893X
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	coastal wetlands, biodegradation, blue carbon, wood decay, fungi, shipworms, carbon cycling, sea level rise (SLR)
NORA Subject Terms:	Ecology and Environment
Date made live:	20 Oct 2022 16:00 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/533393

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