Starke, Claudia, Ekau, Werner and Moosdorf, Nils (2020) Enhanced Productivity and Fish Abundance at a Submarine Spring in a Coastal Lagoon on Tahiti, French Polynesia. Frontiers in Marine Science, 6 . p. 809. DOI https://doi.org/10.3389/fmars.2019.00809.

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Abstract

Submarine groundwater discharge (SGD), the direct discharge of groundwater into the sea, is abundant around the globe. Fresh SGD can occur as focused flow in submarine springs. However, little is known on the impact of submarine springs on marine organisms. For a better understanding of the interaction between SGD and its surrounding organisms, the impact of SGD on the abundance of fish was investigated in a coastal lagoon of Tahiti, French Polynesia. The study is based on the assumption of an enhanced biological production due to increased amounts of nutrient input caused by terrestrial groundwater supply into the sea. Biofouling processes and zooplankton samples were used as indicators for elevated nutrient input due to submarine springs. The main objective was to investigate the effect on the abundance of fish assuming a higher fish abundance possibly caused by a bottom-up control. Presented data show a significantly higher abundance around a submarine spring as well as significantly larger growth of algal turfs exposed to groundwater discharge. Zooplankton evaluations suggest slightly higher abundances around the submarine spring. The results suggest elevated nutrient concentrations transmitted by submarine springs may cause a bottom-up control resulting in a higher abundance of fish around the investigated submarine spring.

Document Type: Article
Programme Area (enter as: PA1/PA2/PA3/PA4/PA5): PA2
Research affiliation: Biogeochemistry and Geology > Submarine Groundwater Discharge
Ecology > Fisheries Biology
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: https://doi.org/10.3389/fmars.2019.00809
ISSN: 2296-7745
Date Deposited: 21 Jan 2020 15:11
Last Modified: 03 Aug 2021 15:33
URI: http://cris.leibniz-zmt.de/id/eprint/3309

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