Short-term nutrient pulses enhance growth and photosynthesis of the coral reef macroalga Sargassum baccularia

Schaffelke, Britta; Klumpp, David

doi:10.3354/meps170095

Cited by 63 publications

(35 citation statements)

References 23 publications

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“…The production of a number of species of coral reef macroalgae respond to short-term nutrient pulses (Lapointe 1985, Littler et al 1991, Delgado & Lapointe 1994, Schaffelke & Klumpp 1998a. This may be facilitated by fast short-term uptake rates and subsequent nutrient storage, an adaptation found in temperate macroalgae from habitats with episodic nutrient supply (Chapman & Craigie 1977, Probyn & Chapman 1982, Rosenberg et al 1984, Fujita et al 1989.…”

Section: An Increase In Available Nutrients In Gbr Watersmentioning

confidence: 99%

“…Thalli were incubated in the 4 perspex chambers of a data-logging respirometer equipped with oxygen electrodes, with automated flushing of the chambers every 15 min. as in Schaffelke & Klumpp (1998a). The sequence was randomised in which the thalli were picked for production measurements.…”

Section: Photosynthesis and Respiration After 24 H Pulse Treatmentsmentioning

confidence: 99%

“…This is also indicated by the calculated detectable-effect size for the non-significant main effects that was in all cases <16%. The nutrient pulse design was based upon a detailed study applying nutrient pulses in different concentrations, durations, and frequencies (Schaffelke & Klumpp 1998a). To obtain a first overview of the type and range of macroalgal responses, experimental nutrient pulses are very useful as they circumvent the problems associated with in situ nutrient enhancement experiments, such as variable background nutrient levels, and the loss of added nutrients by tidal flushing or by nutrient uptake by other reef biota (Hatcher & Larkum 1983, A. Steven pers.…”

Section: Statistical Analysesmentioning

confidence: 99%

“…Flood plumes occasionally inundate the inshore fringing reefs for several days and may have nutrient concentrations in the magnitude of the nutrient pulses used in the present study (Steven et al 1996). The potential significance of these floods for macroalgae was addressed in an experimental study where a single 24 h nutrient pulse sustained the growth of a Sargassum species in situ for 2 wk (Schaffelke & Klumpp 1998a).…”

Section: Statistical Analysesmentioning

confidence: 99%

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Short-term nutrient pulses as tools to assess responses of coral reef macroalgae to enhanced nutrient availability

Schaffelke¹

1999

Mar. Ecol. Prog. Ser.

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Section: An Increase In Available Nutrients In Gbr Watersmentioning

confidence: 99%

Section: Photosynthesis and Respiration After 24 H Pulse Treatmentsmentioning

confidence: 99%

Section: Statistical Analysesmentioning

confidence: 99%

Section: Statistical Analysesmentioning

confidence: 99%

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Short-term nutrient pulses as tools to assess responses of coral reef macroalgae to enhanced nutrient availability

Schaffelke¹

1999

Mar. Ecol. Prog. Ser.

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“…However, field studies in tropical regions suggest there is usually little correlation between ambient water column N or P concentrations and either productivity or abundance of primary producers (for a review see McCook 1999). Low correlation may be due to many nutrient processes, including pulsed nutrient supplies that are spatially and temporally variable (Genin et al 1995, Diaz & Ward 1997, rapid nutrient uptake by primary producers (Uthicke & Klumpp 1998), and tightly coupled recycling between reef organisms (Larned & Stimson 1997, Schaffelke & Klumpp 1998b. Because of this lack of correlation, water column nutrients alone may not always provide an adequate indicator of nutrient supply or bioavailability in tropical systems (McCook 1999).…”

Section: Introductionmentioning

confidence: 99%

Nutrient content of macroalgae with differing morphologies may indicate sources of nutrients for tropical marine systems

Fong¹,

Kamer²,

Boyer³

et al. 2001

Mar. Ecol. Prog. Ser.

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To investigate whether tissue N and P content of morphologically distinct macroalgae reflect different processes controlling nutrient availability, we measured water column nutrients and collected 5 species of algae for tissue N and P analysis from 18 stations along the southwestern coast of Puerto Rico. Nutrient content of sediments was also determined for a subset of stations. Southwestern Puerto Rico was chosen because the literature suggests that gradients in sediment type and organic matter content, advection, and terrestrial influence occur in this region. Stations were either inshore or offshore areas with 3 stations per area chosen a priori as High Nutrient Stations (HNS). Water column and sediment nutrient concentrations were elevated inshore and in HNS. Species were of 3 morphological forms: upright thalli with open branches, densely packed mats, and rhizophytic thalli. In the first category, Acanthophora spicifera had higher N content inshore compared to offshore while both A. spicifera and Hypnea musciformis had higher tissue N and P contents in HNS. In contrast, mat-forming algae (Dictyota dichotoma and D. cervicornis) had higher tissue N and P contents offshore compared to inshore. Although these species had high nutrients in many of the HNS, samples from some offshore reefs were equally high. Halimeda incrassata, a rhizophytic form, had greater tissue N content inshore than offshore. H. incrassata tissue nutrients were also elevated in some HNS, but not others. There were significant correlations between water column and sediment nutrients and the tissue N and P content of A. spicifera and H. incrassata, but not for either Dictyota. These results suggest algae with upright thalli and open-branching patterns may have a more direct relationship between tissue nutrient content and water column nutrient concentration than other forms. In contrast, mat-forming species may deplete nutrients within the mat, relying on strong currents found offshore to penetrate dense mats and replenish nutrients. Rhizophytic algae have access to both water column and sediment nutrients, and higher inshore tissue contents and at some HNS may reflect enhanced nutrient supplies from these sources. Our findings suggest that if other environmental factors are carefully taken into consideration, the tissue N and P content of macroalgae may prove to be an effective indicator of different nutrient sources in tropical systems. KEY WORDS: Macroalgae · Tropics · Nutrients · Morphological forms · Puerto RicoResale or republication not permitted without written consent of the publisher

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Upwelling and the persistence of coral‐reef frameworks in the eastern tropical Pacific

Enochs

Toth

Kirkland

et al. 2021

Ecological Monographs

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In an era of global change, the fate and form of reef habitats will depend on shifting assemblages of organisms and their responses to multiple stressors. Multiphyletic assemblages of calcifying and bioeroding species contribute to a dynamic balance between constructive and erosive processes, and reef-framework growth occurs only when calciumcarbonate deposition exceeds erosion. Each contributing species exhibits a unique combination of environmental sensitivities, trophic needs, and competitive abilities, making the net outcome of their habitat-altering behavior difficult to predict. In this study, standardized blocks of clean, massive Porites were placed at six reef sites in the eastern tropical Pacific, in the strongly and more-weakly upwelling Gulfs of Panam a (GoP) and Chiriqu ı (GoC), respectively. Sites were chosen to characterize the unique thermal and carbonate-chemistry conditions of each gulf. Satellite products were used to examine differences in sea-surface productivity, and surveys were conducted to quantify the abundance of important grazing taxa. After two years in situ, the Porites blocks were collected and scanned using high-resolution computed tomography to volumetrically quantify both endolithic and epilithic habitat alteration. Scan-volumes were further classified into functional groups according to morphology to quantify external bioerosion by fish and sea urchins, as well as the calcifying and bioeroding activity of crustose coralline algae, scleractinian corals, mollusks, annelids, and barnacles. The GoP, which has higher productivity, cooler temperatures, and periodically lower pH conditions, had higher rates of macroboring, but also higher rates of calcification. These unexpectedly higher rates of calcification in the GoP were a result of high recruitment of suspension-feeding taxa, particularly barnacles and vermiform fauna that have poor reef-forming potential. External bioerosion by grazers was the dominant process influencing these dead coral substrates across both gulfs, contributing to higher rates of net erosion in the GoC and underscoring the important roles that urchins and fish play in not just removing algae on reefs, but also eroding reef habitat. Ultimately these findings reveal that the trophic requirements of habitat-altering taxa are closely tied to reef-framework stability, and that environmental conditions conducive to carbonate precipitation are not necessarily those that will lead to habitat persistence.

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Short-term nutrient pulses enhance growth and photosynthesis of the coral reef macroalga Sargassum baccularia

Cited by 63 publications

References 23 publications

Short-term nutrient pulses as tools to assess responses of coral reef macroalgae to enhanced nutrient availability

Short-term nutrient pulses as tools to assess responses of coral reef macroalgae to enhanced nutrient availability

Nutrient content of macroalgae with differing morphologies may indicate sources of nutrients for tropical marine systems

Upwelling and the persistence of coral‐reef frameworks in the eastern tropical Pacific

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