The influence of crab burrows on sediment salinity in a Rhizophora-dominated mangrove forest in North Brazil during the dry season

Pestana, Debora Ferreira; P�lmanns, Nathalie; Nordhaus, Inga; Diele, Karen; Zimmer, Martin

Abstract

Many ecological processes are influenced by salinity. Burrowing crabs, abundant fauna of mangrove forests around the world, can facilitate sediment water fluxes, which may decrease the salinity in mangrove sediments. We investigated whether and how crab burrow density and secondary fine root biomass interact to drive sediment salinity during the dry season in a northern Brazilian mangrove forest. Areas with high density of Rhizophora mangle prop roots and areas free of such roots were compared. We found no correlation between burrow density and sediment salinity in areas with dense prop and fine roots, while crab density correlated negatively with sediment salinity in areas without prop roots, where fine root density was low. Hence, the strength of sediment desalination effects of crabs seems to be context dependent, and high root density of a salt-excluding mangrove species (R. mangle) seems to counteract the crabs’ effect. Our results complement those of a former study conducted in the same area during the rainy season, highlighting that the findings are independent from seasonality and should be considered when evaluating the overall ecological effects of crabs in mangrove ecosystems.

Citation

Pestana, D. F., Pülmanns, N., Nordhaus, I., Diele, K., & Zimmer, M. (2017). The influence of crab burrows on sediment salinity in a Rhizophora-dominated mangrove forest in North Brazil during the dry season. Hydrobiologia, 803(1), 295-305. https://doi.org/10.1007/s10750-017-3282-4

• Journal Article Type: Article
• Acceptance Date: Jun 21, 2017
• Online Publication Date: Jul 12, 2017
• Publication Date: Jul 12, 2017
• Deposit Date: Jul 14, 2017
• Publicly Available Date: Jul 13, 2018
• Journal: Hydrobiologia
• Print ISSN: 0018-8158
• Electronic ISSN: 1573-5117
• Publisher: BMC
• Peer Reviewed: Peer Reviewed
• Volume: 803
• Issue: 1
• Pages: 295-305
• DOI: https://doi.org/10.1007/s10750-017-3282-4
• Keywords: Rhizophora mangle Mangrove Ucides cordatus Sediment salinity I
• Public URL: http://researchrepository.napier.ac.uk/Output/962305
• Contract Date: Jul 14, 2017