Influences of N-Fixing and Non-N-Fixing Vegetation and Invasive Fish on Water Chemistry of Hawaiian Anchialine Ponds
| Autor: | Richard A. MacKenzie, H. Dulaiova, B. D. Dudley, C. A. Waters, Rebecca Ostertag, R. F. Hughes, T. S. Sakihara |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Pacific Science. 68:509-523 |
| ISSN: | 1534-6188 0030-8870 |
| DOI: | 10.2984/68.4.5 |
| Popis: | In coastal waters, it remains unclear how terrestrial invasive species might alter nutrient availability and thus affect bottom-up control of primary production. Anchialine ponds are tidal- and groundwater-fed coastal water bodies without surface connections that provide convenient model systems in which to examine terrestrial to aquatic nutrient flow. To investigate how N-fixing and non-N-fixing terrestrial vegetation and invasive consumers affect water quality, we compared dissolved nutrient concentrations and physicochemical parameters among Hawaiian anchialine ponds surrounded by: (1) the nonnitrogen (N)-fixing tree Thespesia populnea (milo), (2) the exotic N-fixing tree Prosopis pallida (kiawe), (3) no tree cover, and (4) no tree cover but containing populations of invasive poeciliid fish. Average (±1 SE) concentration of dissolved inorganic nitrogen (DIN) across all ponds (51.15 µM ±3.1; n = 17) was high, but there was no discernible pattern among pond types. Model results suggest that leaf litter breakdown from the exotic N-fixing tree contributed |
| Databáze: | OpenAIRE |
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