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  • periphyton  (1)
  • stream  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Distribution of benthic algae and macroinvertebrates along a thermal stream gradient (1985)
    Springer
    Hydrobiologia 128 (1985), S. 13-21 
    Details
    ISSN: 1573-5117
    Keywords: algae ; benthic ; geothermal ; macroinvertebrates ; stream ; thermal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution and abundance of benthic algae and macroinvertebrates were examined along a natural thermal gradient formed by hot springs in Little Geysers Creek, Sonoma Co., California, USA. Maximum water temperatures ranged from 52 °C at the uppermost station to 23 °C at a station 400 m downstream. Benthic chlorophyll a decreased exponentially from 2.5 g m−2 at 52 °C to less than 0.1 g m−2 at 23 °C, a pattern of decline also exhibited by algal phaeophytin. Blue-green algae dominated at higher temperatures but were replaced by filamentous green algae and diatoms at lower temperatures. Macroinvertebrates were absent at temperatures ⩾45 °C; the highest density (〉 150 000 m−2, mainly Chironomidae) occurred at 34 °C, whereas biomass was highest (4.6 g m−2, as dry weight) at 23 °C and species richness (15 species) was highest at 27 °C. The two predominant macroinvertebrate populations (the midge Tanytarsus sp. and the caddisfly Helicopsyche borealis) occurred at sites that were several degrees below their lethal thermal threshold, suggesting that a temperature ‘buffer’ is maintained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008935
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of grazer type and abundance on plant-herbivore interactions in streams (1995)
    Springer
    Hydrobiologia 306 (1995), S. 179-188 
    Details
    ISSN: 1573-5117
    Keywords: herbivory ; laboratory streams ; periphyton ; feeding ; macroinvertebrates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Grazer-periphyton interactions were investigated in 11 laboratory streams holding a range of densities of three herbivore taxa during a 32-d experiment. Effects of grazers on algae were strongest with Dicosmoecus gilvipes caddisflies, intermediate with Juga silicula snails, and weakest with Baetis spp. mayflies. Algal standing crop, export, and gross primary production declined logarithmically with increasing grazer density. Algal turnover rate, however, increased with grazer abundance. At high densities of all grazers, responses in most algal parameters converged, suggesting that high grazing pressure, regardless of taxon, will similarly affect periphyton. Growth of both Dicosmoecus caddisflies and Juga snails was density-dependent, with the highest growth rates occurring at the lowest densities. Caddisflies displayed high growth rates but low efficiency in resource use. Snails had lower growth rates but were more efficient in resource use. The coexistence of Dicosmoecus and Juga, or other competing herbivores, in natural streams may be related to these fundamental differences in life history strategies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017689
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    Paper (German National Licenses)
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