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Marine Ecology Progress Series

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MEPS 621:51-67 (2019)  -  DOI: https://doi.org/10.3354/meps12992

Macroalgal biomass, growth rates, and diversity are influenced by submarine groundwater discharge and local hydrodynamics in tropical reefs

Florybeth Flores La Valle1,4,*, Florence I. Thomas2, Craig E. Nelson3

1Marine Biology Graduate Program, University of Hawai‘i at Mānoa, 2525 Correa Rd., HIG 132, Honolulu, Hawai‘i 96822, USA
2Hawai‘i Institute of Marine Biology, 46-007 Lilipuna Rd., Kaneohe, Hawai‘i 96744, USA
3Center for Microbial Oceanography: Research and Education (C-MORE), Department of Oceanography, University of Hawai‘i at Mānoa and University of Hawai‘i Sea Grant, 1000 Pope Rd., Honolulu, Hawai‘i 96822, USA
4Present address: Department of Environmental Science, Policy, and Management, University of California, Berkeley, Mulford Hall, 130 Hilgard Way, Berkeley, California 94720, USA
*Corresponding author:

ABSTRACT: It is critical to evaluate the in situ effects of multiple stressors on coastal community dynamics, especially those communities harboring high diversity such as coral reefs, in order to understand the resilience of these ecosystems, prepare coastal management for future scenarios, and aid in prioritizing restoration efforts. In this in situ study, at 2 sites with gradients of submarine groundwater discharge (SGD), a suite of physical parameters (wave exposure index, wind exposure index, and depth) and an all-encompassing SGD chemical parameter (average nitrate + nitrite daily load) were measured along spatially cohesive and temporally relevant scales and used to model macroalgal growth, biomass, and diversity in Maunalua Bay, Hawai‘i. We showed that (1) species-specific macroalgal biomass is significantly related to SGD and one of the 2 exposure indices (i.e. wind exposure or wave exposure), (2) SGD and wave exposure play key roles in species-specific growth rates, and (3) SGD supports low diversity and increased biomass of species that can tolerate the biogeochemistry associated with SGD. Our work suggests that SGD and local hydrodynamics predict local variation in macroalgal growth, biomass, and diversity in tropical reefs.


KEY WORDS: Benthic algae · Nutrient loading · Algal growth · Algal biomass · Local diversity · Exposure


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Cite this article as: La Valle FF, Thomas FI, Nelson CE (2019) Macroalgal biomass, growth rates, and diversity are influenced by submarine groundwater discharge and local hydrodynamics in tropical reefs. Mar Ecol Prog Ser 621:51-67. https://doi.org/10.3354/meps12992

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