Concurrent grazing effects of two stream insects on periphyton1

Hill, Walter R.; Knight, Allen W.

doi:10.4319/lo.1988.33.1.0015

Cited by 85 publications

(58 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(Cyanobacteria) dominance in the surrounding stone biofilm (Hasselrot et al 1996). High abundances of diatoms on larval retreats and in grazing areas of various macroinvertebrates are commonly found in epilithic biofilms (Hart 1985, Hershey et al 1988, Hill & Knight 1988, Lowe & Hunter 1988. Possible mechanisms of diatom enrichment comprise (1) the deliberate removal and disposal of unsuitable microphytobenthic species (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Possible mechanisms of diatom enrichment comprise (1) the deliberate removal and disposal of unsuitable microphytobenthic species (e.g. Microcoleus vaginatus, Cyanobacteria, Hart 1985), (2) the inaccessibility of adnate diatoms compared to overstory algae (Hill & Knight 1988), and (3) the fast recolonisation by diatomean immigrant species (Bergey 1995). In our study we have not attempted to investigate the mechanism of the diatom enrichment on the Tinodes retreat and there are no indications that one of the proposed mechanisms applies here.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Structuring of epilithic biofilms by the caddisfly Tinodes rostocki: photosynthetic activity and photopigment distribution in and beside larval retreats

Stief¹,

Becker²

2005

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

Tinodes rostocki larvae (Trichoptera: Psychomyiidae) cover large proportions of stream hard substrata with retreats constructed of mineral particles and larval silk. We consider these retreats as 3-dimensional extensions of the epilithic biofilm that may possess a distinct microenvironment, community metabolism and composition. Therefore, we compared the photosynthetic/respiratory activities (O 2 and pH microsensors) and the photopigment composition (HPLC) of larval retreats and the surrounding epilithic biofilms. In retreats, pigment contents and photosynthetic/respiratory activities were highest in sections with a visible microphytobenthic biofilm that were mostly the older parts of the retreats. In contrast, newly constructed sections of the retreats and the surrounding epilithic biofilm had approximately 5-fold lower values. The fucoxanthin-to-chlorophyll ratio of the retreat biofilm was high (fuco/chl a = 1.27) and indicated diatom dominance, which was not evident in the surrounding epilithic biofilm (fuco/chl a = 0.15). Experimental transplantation of larval retreats to microscope slides allowed microsensor measurements through the 500 to 700 µm-thick wall and inside the lumen. In the light, O 2 concentration and pH values increased significantly across the wall and remained high in the lumen of the retreat, whereas in darkness O 2 and pH depressions in both wall and lumen were moderate or even absent. Our data suggest that T. rostocki larvae construct and maintain retreats with a particular physico-chemical microenvironment that favours a distinct microbial community. Thereby, abundant T. rostocki larvae might significantly influence benthic primary production and heterotrophic metabolism in small streams.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Structuring of epilithic biofilms by the caddisfly Tinodes rostocki: photosynthetic activity and photopigment distribution in and beside larval retreats

Stief¹,

Becker²

2005

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

show abstract

“…According to Arens (1989), prognathous insects, like the leptohyphids in our study, press their mouthparts almost horizontally against the surface of the stones, so that larger areas of their labium and maxillae come into contact with algal pastures, therefore, prognathous insects should be able to graze down algal pastures more quickly than orthognathous species. Scrapers are usually better at feeding on low-profile algae than those species with collector-gatherer mouthparts (Hill & Knight 1988). Therefore, although grazers and scrapers feed on periphyton, these two groups are probably not feeding exactly on the same kinds of periphyton.…”

Section: Discussionmentioning

confidence: 99%

Functional feeding groups of Brazilian Ephemeroptera nymphs : ultrastructure of mouthparts

Baptista

Buss

Dias

et al. 2006

Ann. Limnol. - Int. J. Lim.

View full text Add to dashboard Cite

“…Gradients in herbivore population density have been shown to affect algal community structure and benthic chlorophyll a accumulation (Feminella & Resh, 1990) or, conversely, to have little effect on algal standing crop (Martin et al, 1991) . Different types of herbivores also may have varying effects on the biomass and physiognomy of periphyton, due to differences in grazer feeding structures, ingestion rates, habitat preferences, or behavior (Hill & Knight, 1988 ;Feminella & Resh, 1991) .…”

Section: Introductionmentioning

confidence: 99%

Influence of grazer type and abundance on plant-herbivore interactions in streams

Lamberti

Gregory²,

Ashkenas³

et al. 1995

Hydrobiologia

View full text Add to dashboard Cite

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 .

show abstract

Concurrent grazing effects of two stream insects on periphyton1

Cited by 85 publications

References 10 publications

Structuring of epilithic biofilms by the caddisfly Tinodes rostocki: photosynthetic activity and photopigment distribution in and beside larval retreats

Structuring of epilithic biofilms by the caddisfly Tinodes rostocki: photosynthetic activity and photopigment distribution in and beside larval retreats

Functional feeding groups of Brazilian Ephemeroptera nymphs : ultrastructure of mouthparts

Influence of grazer type and abundance on plant-herbivore interactions in streams

Contact Info

Product

Resources

About