Planktonic and benthic microalgal community composition as indicators of terrestrial influence on a fringing reef in Ishigaki Island, Southwest Japan

Blanco, A. C.; Nadaoka, Kazuo; Yamamoto, Takahiro

doi:10.1016/j.marenvres.2008.08.005

Cited by 57 publications

(51 citation statements)

References 43 publications

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“…This spatial variation might further reflect the surrounding environmental conditions since the microalgae are most sessile and integrate effects of environmental factors over time. Nutrient level and availability should be one of the direct factors that could not only control phytoplankton abundance but also influence the community composition (Piehler et al, 2004;Blanco et al, 2008). Besides the dissolved nutrients, many other factors might also influence the species composition, like currents, temperature, feeding pressure by zooplankton and benthos (Kuo et al, 1978a,b;Song et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Its abundance and composition vary with the environmental conditions, including both physical and chemical factors, such as temperature, salinity, turbidity, nutrient levels and so on (e.g., Blanco et al, 2008). They can respond quickly and differently to the changes in the habitats over a wide range of temporal scales from hours to even years.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, to establish whether the reef environment influences the phytoplankton composition, the differentiation of algal groups is necessary (van Duyl et al, 2002). In most studies, chlorophyll a has been used as the bulk indicator of total biomass and/or nutrient enrichment, while taxonomic groups have rarely been studied in coral reef waters, especially in tropical oceans (Kuo et al, 1978a,b;van Duyl et al, 2002 and references therein; Blanco et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Only at class-level analysis are available and some important taxonomic groups are mixed, for example, both diatoms and dinoflagellates are classed as the 'brown' algae (Blanco et al, 2008). Moreover, quantitative tests of the agreement between pigment analysis and microscopic analysis in natural waters are scarce, due to difficulties in precisely converting microscopic estimates of phytoplankton cell number, volume and pigment contents into carbon (Al-Najjar et al, 2007 and references therein).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Occurrence of brackish water phytoplankton species at a closed coral reef in Nansha Islands, South China Sea

Shen

Tan

Huang

et al. 2010

Marine Pollution Bulletin

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Occurrence of brackish water phytoplankton species at a closed coral reef in Nansha Islands, South China Sea

Shen

Tan

Huang

et al. 2010

Marine Pollution Bulletin

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“…The water outflowing from the bay provided phytoplankton near the channel mouths. Blanco et al (2008) reported that diatoms were more abundant in reef areas influenced by the water discharged from river and agricultural drainage outlets near the coast of Shiraho Reef, located on the east coast of Ishigaki Island. Although the species composition of phytoplankton was not determined in this study, the outflowing water from the bay most probably contained large-sized phytoplankton, which would have been available to copepods, in contrast with the smaller-sized phytoplankton that probably dominated in the oceanic water.…”

mentioning

confidence: 99%

Community structure and abundance of copepods in summer on a fringing coral reef off Ishigaki Island, Ryukyu Islands, Japan

Fukuoka

Shimoda

Abe

2015

Plankton Benthos Res

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Abstract:Mesozooplankton is an important component of coral reef ecosystems. This study investigated the community structure and abundance of copepods in the fore-reef environment around channel mouths and the adjacent offshore waters of Ishigaki Island in the summer. The fore-reef station group of copepods was significantly distinguishable from the offshore station group in terms of community structure. Unlike the fore-reef group, the offshore group showed high species diversity, low density of calanoids and was composed mainly of oceanic species. The fore-reef group was characterized by the littoral species Acartia fossae, Bestiolina similis, Oithona simplex, and Oithona dissimilis. High densities of these species were recorded near channel mouths. The pattern of tidal changes near the channel mouth accorded with the characteristics of the environment. The channel mouths might be preferred because they offer a food-rich environment for the coral reef species A. fossae, passive transportation by the ebb current for the estuarine species O. dissimilis, and reef system circulation for the euryhaline species B. similis and O. simplex. The species composition and densities of the calanoids in the fore-reef stations differed between the east and west sides of the channel mouths, suggesting tidal and topographical influences.

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Dynamic evolution of nutrient discharge under stormflow and baseflow conditions in a coastal agricultural watershed in Ishigaki Island, Okinawa, Japan

Blanco

Nadaoka

Yamamoto

et al. 2010

Hydrological Processes

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Abstract:Excessive terrestrial nutrient loadings adversely impact coral reefs by primarily enhancing growth of macroalgae, potentially leading to a phase-shift phenomenon. Hydrological processes and other spatial and temporal factors affecting nutrient discharge must be examined to be able to formulate effective measures for reducing nutrient export to adjacent reefs. During storm events and baseflow periods, water samples were obtained from the tropical Todoroki River, which drains an intensively agricultural watershed into Shiraho coral reef. In situ nutrient analyzers were deployed for 6 months to hourly measure dissolved nutrient (NO 3 -N and PO 4 3 -P) concentrations. Total phosphorus (TP) and suspended solid concentration (TSS) were increased by higher rainfall intensity (r D 0Ð94, p < 0Ð01) and river discharge Q (r D 0Ð88, p < 0Ð01). In contrast, NO 3 -N concentration tends to decrease drastically (e.g. from 3 to 1 mg l 1 ) during flood events. When base flow starts to dominate afterwards, NO 3 -N manifested an increasing trend, but decreases when baseflow discharge becomes low. This counter-clockwise hysteresis for NO 3 -N highlights the significant influence of groundwater discharge. N delivery can therefore be considered a persistent process compared to sediment and P discharge, which are highly episodic in nature. Based on GIS analysis, nutrient concentration along the Todoroki River was largely affected by the percentage of sugarcane/bare areas and bedrock type. The spatial distribution of N concentration in the river reflects the considerable influence of subsurface geology-higher N levels in limestone-dominated areas. P concentrations were directly related to the total length of artificial drainage, which enhances sediment transport. The use of high-resolution monitoring data coupled with GIS-based spatial analysis therefore enabled the clarification of control factors and the difference in the spatio-temporal discharge characteristics between N and P. Thus, although erosion-reduction schemes would reduce P discharge, other approaches (e.g. minimize fertilizer) are needed to reduce N discharge.

show abstract

Planktonic and benthic microalgal community composition as indicators of terrestrial influence on a fringing reef in Ishigaki Island, Southwest Japan

Cited by 57 publications

References 43 publications

Occurrence of brackish water phytoplankton species at a closed coral reef in Nansha Islands, South China Sea

Occurrence of brackish water phytoplankton species at a closed coral reef in Nansha Islands, South China Sea

Community structure and abundance of copepods in summer on a fringing coral reef off Ishigaki Island, Ryukyu Islands, Japan

Dynamic evolution of nutrient discharge under stormflow and baseflow conditions in a coastal agricultural watershed in Ishigaki Island, Okinawa, Japan

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