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A functional analysis reveals extremely low redundancy in global mangrove invertebrate fauna

Cannicci, Stefano; Lee, Shing Yip; Bravo, Henrique; Cantera-Kintz, Jaime Ricardo; Dahdouh-Guebas, Farid; Fratini, Sara; Fusi, Marco; Jimenez, Pedro J.; Nordhaus, Inga; Porri, Francesca; Diele, Karen


Stefano Cannicci

Shing Yip Lee

Henrique Bravo

Jaime Ricardo Cantera-Kintz

Farid Dahdouh-Guebas

Sara Fratini

Marco Fusi

Pedro J. Jimenez

Inga Nordhaus

Francesca Porri


Deforestation results in habitat fragmentation, decreasing diversity, and functional degradation. For mangroves, no data are available on the impact of deforestation on the diversity and functionality of the specialized invertebrate fauna, critical for their functioning. We compiled a global dataset of mangrove invertebrate fauna comprising 364 species from 16 locations, classified into 64 functional entities (FEs). For each location, we calculated taxonomic distinctness (Δ+), functional richness (FRi), functional redundancy (FRe), and functional vulnerability (FVu) to assess functional integrity. Δ+ and FRi were significantly related to air temperature but not to geomorphic characteristics, mirroring the global biodiversity anomaly of mangrove trees. Neither of those two indices was linked to forest area, but both sharply decreased in human-impacted mangroves. About 60% of the locations showed an average FRe < 2, indicating that most of the FEs comprised one species only. Notable exceptions were the Eastern Indian Ocean and west Pacific Ocean locations, but also in this region, 57% of the FEs had no redundancy, placing mangroves among the most vulnerable ecosystems on the planet. Our study shows that despite low redundancy, even small mangrove patches host truly multifunctional faunal assemblages, ultimately underpinning their services. However, our analyses also suggest that even a modest local loss of invertebrate diversity could have significant negative consequences for many mangroves and cascading effects for adjacent ecosystems. This pattern of faunal-mediated ecosystem functionality is crucial for assessing the vulnerability of mangrove forests to anthropogenic impact and provides an approach to planning their effective conservation and restoration.

Journal Article Type Article
Online Publication Date Jul 26, 2021
Publication Date Aug 10, 2021
Deposit Date Aug 9, 2021
Publicly Available Date Aug 9, 2021
Journal Proceedings of the National Academy of Sciences
Electronic ISSN 1091-6490
Publisher National Academy of Sciences
Peer Reviewed Peer Reviewed
Volume 118
Issue 32
Article Number e2016913118
Keywords community ecology, functional redundancy, functional traits, biodiversity, mangrove conservation
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A Functional Analysis Reveals Extremely Low Redundancy In Global Mangrove Invertebrate Fauna (1.6 Mb)

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Copyright Statement
This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).

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