Sediment characteristics determine the flowering effort of Zostera noltei meadows inhabiting a human-dominated lagoon

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Abstract

Recent studies have shown increasing Zostera noltei meadows in areas modified by anthropogenic activities. However, it is not entirely clear whether this trend of expansion could be linked to a greater reproductive effort in the species. Anthropogenic stressors can induce the reproductive effort of seagrass meadows as a response to stress, but other variables, such as seagrass biometrics or environmental factors, can also influence their sexual reproduction. To increase the knowledge regarding this issue, we monitored the flowering effort, seagrass biometrics and abiotic parameters of three Z. noltei meadows in an area that has been highly modified by anthropogenic activities during the past decades. Results showed that silt and clay content in the sediment (strongly correlated with organic matter) and seagrass vertical shoot density explained 54% of the variability in the flowering effort of the meadows. This study suggests that stress-induced flowering of Z. noltei may occur under determinate environmental conditions, such as silty environments with organic enrichment.

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Guerrero-Meseguer, L., Veiga, P., Sampaio, L., & Rubal, M. (2021). Sediment characteristics determine the flowering effort of Zostera noltei meadows inhabiting a human-dominated lagoon. Plants, 10(7). https://doi.org/10.3390/plants10071387

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