Photosynthesis–light relations of stream periphyton communities

Boston, Harry L.; Hill, Walter R.

doi:10.4319/lo.1991.36.4.0644

Cited by 142 publications

(84 citation statements)

References 25 publications

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“…High biomass may be a consequence of rapid growth and/or slow loss processes. Assimilation numbers were not unusually high; for the 1 m community it was similar to those of thick stream periphyton (Boston & Hill 1991) and for deeper communities, they were higher than those reported by Loeb & Reuter (1981), but similar to those reported by Duthie & Jones (1990) from Lake Huron, Canada. Unusually high growth rates are therefore unlikely, and the rate of increase of chlorophyll a in late winter suggested a slow doubling time of 130 days.…”

Section: Biomass and Productivitysupporting

confidence: 76%

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Seasonal dynamics of epilithic periphyton in oligotrophic Lake Taupo, New Zealand

Hawes

Smith

1994

New Zealand Journal of Marine and Freshwater Research

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The biomass and species composition of epilithic periphyton in oligotrophic Lake Taupo was measured over a full year. Measurements of photosynthetic carbon uptake were made during summer and early winter. The lake supported a high biomass of epilithic periphyton throughout the year, averaging 100-600 mg m -2 over the 0-35 m water depth and peaking in early summer. Periphyton extended to at least 40 m depth. Depthintegrated carbon fixation rates of 242-362 mg m -2 h -1 were measured. Periphyton constituted more than 90% of the algal biomass and carbon fixation within the littoral zone, but less than 2% of production on a whole-lake basis. Based on taxonomic composition, periphyton could be divided into three zones, surface (0-2 m), mid water (2-20 m) and deep (> 20 m). The diatoms Aulacosira granulata, Rhopalodia novae zealandiae, Epithemia sorex, and Fragilaria spp. dominated the deep assemblage, Tolypothrix tenuis and Mastogloia elliptica the mid water, and Scytonema, Dichothrix, and filamentous chlorophytes the shallow zone. Indicator pigments, analysed by high-performance liquid chromatography, confirmed these groupings. Biomassspecific rates of photosynthesis were low in shallow water (assimilation number 1 at 1 m depth) and at depths of 20 m and below, photosynthesis was light-limited. We hypothesise that the periphyton community was slow-growing and that the high biomass seen at all depths resulted from gradual accrual with low rates of loss.

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Section: Biomass and Productivitysupporting

confidence: 76%

“…All species found at 30 m were present in the lower layers of the 5 m periphyton mat, where, as a result of light absorbtion within the periphyton film, a comparable light climate may have existed (Boston & Hill 1991).…”

Section: Zonation With Depthmentioning

confidence: 99%

Seasonal dynamics of epilithic periphyton in oligotrophic Lake Taupo, New Zealand

Hawes

Smith

1994

New Zealand Journal of Marine and Freshwater Research

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“…The relative importance of these sources depends partially on the availability of terrestrial and aquatic material (Polis et al 1997, Bouillon et al 2004. While the availability of autochthonous material is regulated by physical and biological factors such as light (e.g., Boston and Hill 1991) and nutrient availability (Flindt et al 1999), turbidity, water depth (e.g., Krause-Jensen and Sand-Jensen 1998) and substrate type (Rizzo and Wetze 1985), the availability of terrestrial material depends on a different set of factors such as hydrodynamics and geomorphology and landscape characteristics of the catchment (Polis et al 1997, Hoeinghaus et al 2011. Rivers and estuaries are subjected to high human pressure, as their settings make them ideal for human settlement.…”

Section: Introductionmentioning

confidence: 99%

Importance of terrestrial subsidies for estuarine food webs in contrasting East African catchments

et al. 2013

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Abstract. Little is known on the degree to which terrestrial organic matter delivered to tropical estuaries contributes to estuarine consumers. Here, stable isotope analysis is used to constrain this contribution for contrasting east African estuaries whose catchments differ in relative C3/C4 vegetation cover. As these two types of vegetation differ strongly in d 13 C, we anticipated that terrestrial subsidies would be reflected in a gradient in estuarine consumer d13 C values, following the relative importance of C3 (characterised by low consumer trophic guilds, confirming the incorporation of organic material transported from the catchments by estuarine consumers, and implying that this material is transported up to high trophic level fish. Bayesian mixing models confirmed that C4 material was the most important source for the highly turbid, C4-dominated estuaries, contributing up to 61-91% (95% CI) to phytodetritivorous fish in the Betsiboka, whereas for the less turbid C3-dominated estuaries terrestrial subsidies were not as important and consumers relied on a combination of terrestrial and aquatic sources. This shows that the ecology of the overall catchment affects the estuaries at the most basic, energetic level, and activities that alter the turbidity and productivity of rivers and estuaries can affect food webs well beyond the area of impact.

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“…It has been shown to affect primary production by shading (Boston & Hill 1991), input of allochthonous material (Bilby & Bisson 1992), and changes to substrate size (Young 1980)-which indirectly affect secondary production. Hence, ecologists have allocated considerable effori to determining the significance of the riparian zone to fish and macroinvertebrate communities.…”

Section: Introductionmentioning

confidence: 99%

Prey availability and diet of juvenile brown trout (Salmo trutta) in relation to riparian willows (Salix‐spp.) in three New Zealand streams

Sagar

Glova

1995

New Zealand Journal of Marine and Freshwater Research

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Photosynthesis–light relations of stream periphyton communities

Abstract: The photosynthesis-irradiance

Cited by 142 publications

References 25 publications

Seasonal dynamics of epilithic periphyton in oligotrophic Lake Taupo, New Zealand

Seasonal dynamics of epilithic periphyton in oligotrophic Lake Taupo, New Zealand

Importance of terrestrial subsidies for estuarine food webs in contrasting East African catchments

Prey availability and diet of juvenile brown trout (Salmo trutta) in relation to riparian willows (Salix‐spp.) in three New Zealand streams

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