Regional-scale nitrogen and phosphorus budgets for the northern (14°S) and central (17°S) Great Barrier Reef shelf ecosystem

Furnas, Miles; Alongi, Daniel M.; McKinnon, David; Trott, Lindsay; Skuza, Michele

doi:10.1016/j.csr.2011.09.007

Cited by 81 publications

(126 citation statements)

References 94 publications

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“…However, DON can originate from a range of both external and internal sources. Other external sources can include groundwater, surface water and atmospheric deposition (Furnas et al, 2011;Markaki et al, 2010;Seitzinger and Sanders, 1997) while internal sources can include the production of DON through a biological process in corals and algae (Haas and Wild, 2010;Tanaka et al, 2011aTanaka et al, , 2011bWild et al, 2004). In this study, although DON was the largest fraction of total N in the streams and over one quarter of groundwater N was DON, there was still more than five times the amount of DON leaving the lagoon compared to coming in through groundwater and surface water.…”

Section: Lagoon and Offshore Watersmentioning

confidence: 77%

“…Furnas et al (2011) reported that in the Great Barrier Reef, DON was the largest N pool, with median concentrations ranging from 4 to 8 μmol L −1 which is within the range found in the Muri Lagoon (0.1 to~20 μmol L −1 ). Furnas et al (2011) suggested that the dissolved inorganic N concentrations in the GBR are likely kept low due to the rapid recycling of N through reef heterotrophs and autotrophs.…”

Section: Lagoon and Offshore Watersmentioning

confidence: 84%

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The influence of groundwater inputs and age on nutrient dynamics in a coral reef lagoon

et al. 2014

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Section: Lagoon and Offshore Watersmentioning

confidence: 77%

Section: Lagoon and Offshore Watersmentioning

confidence: 84%

The influence of groundwater inputs and age on nutrient dynamics in a coral reef lagoon

et al. 2014

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“…The prolonged (months) elevation of TSS supports emerging evidence that flood-derived fine sediments are retained within the inshore GBR (Lambrechts et al 2010;Fabricius et al 2013), as shown elsewhere (Draut et al 2009), and add to turbidity as a result of repeated resuspension until being winnowed away by wave and tidal activity ). The demonstrated relationship between discharge of local rivers and Chl reiterates the relationship between runoff and the availability of nutrients in coastal waters (Furnas et al 2005(Furnas et al , 2011Wooldridge et al 2006).…”

Section: Discussionmentioning

confidence: 91%

Coral community responses to declining water quality: Whitsunday Islands, Great Barrier Reef, Australia

et al. 2014

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A five-year period (2002)(2003)(2004)(2005)(2006) of belowmedian rainfall followed by a six-year period (2007)(2008)(2009)(2010)(2011)(2012) of above-median rainfall and seasonal flooding allowed a natural experiment into the effects of runoff on the water quality and subsequent coral community responses in the Whitsunday Islands, Great Barrier Reef (Australia). Satellite-derived water quality estimates of total suspended solids (TSS) and chlorophyll-a (Chl) concentration showed marked seasonal variability that was exaggerated during years with high river discharge. During above-median rainfall years, Chl was aseasonally high for a period of 3 months during the wet season (February-April), while TSS was elevated for four months, extending into the dry season (March-June). Coinciding with these extremes in water quality was a reduction in the abundance and shift in the community composition, of juvenile corals. The incidence of coral disease was at a maximum during the transition from years of below-median to years of abovemedian river discharge. In contrast to juvenile corals, the cover of larger corals remained stable, although the composition of communities varied along environmental gradients. In combination, these results suggest opportunistic recruitment of corals during periods of relatively low environmental stress with selection for more tolerant species occurring during periods of environmental extremes.

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“…Climatic events can result in elevations of nutrient and phytoplankton biomass during periods of strong vertical mixing (e.g. storms, cyclones) or from land runoff, particularly during the wet season (e.g., McKinnon et al, 2007;Furnas et al, 2011).…”

Section: Study Areasmentioning

confidence: 99%

“…The studies were undertaken in 14 regions characterized by high water temperatures (22-34 • C), low dissolved nutrient concentrations and low plankton biomass (Furnas et al, 2011;Supplementary Material). The climate in these areas is typically monsoonal, with a wet summer season (December-March) and a dry winter season (April-November).…”

Section: Study Areasmentioning

confidence: 99%

Plankton Respiration, Production, and Trophic State in Tropical Coastal and Shelf Waters Adjacent to Northern Australia

et al. 2017

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In a changing ocean, tropical waters can be instructive as to the potential effects of climate induced changes on marine ecosystem structure and function. We describe the relationships between planktonic community respiration (CR), net community production (NCP), gross primary production (GPP), and environmental variables in 14 regions and three ecosystem types (coastal, coral reef, and open sea) from Australia, Papua New Guinea, and Indonesia. The data are compiled from separate studies conducted between 2002 and 2014 with the goal of better parameterizing the metabolic balance in tropical marine waters. Overall, these regions were strongly autotrophic (average GPP:CR ratio: 2.14 ± 0.98), though our dataset of 783 paired measurements did include some oceanic stations where heterotrophy (GPP:CR < 1) was predominant, and some coastal stations that were intermittently heterotrophic. Our statistical analysis suggested that temperature was the most important determinant of CR in coral reef and ocean ecosystems but less so in coastal ecosystems, where chlorophyll concentration was more important. In contrast, chlorophyll and sampling depth were more important in regulating GPP than temperature. The relationships between temperatures and metabolic rates showed that these were ecosystem-dependent, with coastal ecosystems showing less response to temperature than coral reef and open sea sites. The threshold of GPP to achieve metabolic balance fell in a range between 0.715 mmol O 2 m −3 d −1 in the Coral Sea to 10.052 mmol O 2 m −3 d −1 in mangrove waterways of Hinchinbrook Channel. These data allow regions in and around northern Australia to be ranked in terms of trophic state, ranging from the oligotrophic Scott Reef (GPP:CR = 0.84 ± 0.08) to productive surface waters of the Kimberley coast (GPP:CR = 5.21 ± 0.62). The measurement of pelagic metabolism shows potential as a quantitative tool to monitor the trophic state of coastal waters.

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Regional-scale nitrogen and phosphorus budgets for the northern (14°S) and central (17°S) Great Barrier Reef shelf ecosystem

Cited by 81 publications

References 94 publications

The influence of groundwater inputs and age on nutrient dynamics in a coral reef lagoon

The influence of groundwater inputs and age on nutrient dynamics in a coral reef lagoon

Coral community responses to declining water quality: Whitsunday Islands, Great Barrier Reef, Australia

Plankton Respiration, Production, and Trophic State in Tropical Coastal and Shelf Waters Adjacent to Northern Australia

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