Gut passage and insect grazer selectivity of lotic diatoms
Identifieur interne : 000844 ( Istex/Checkpoint ); précédent : 000843; suivant : 000845Gut passage and insect grazer selectivity of lotic diatoms
Auteurs : Christopher G. Peterson [États-Unis]Source :
- Freshwater Biology [ 0046-5070 ] ; 1987-12.
English descriptors
- Teeft :
- Algal, Algal communities, Annual review, Aquatic insects, Caddisfly, Caddisfly larvae, Cell percentages, Common diatom taxa, Dead cells, Dead diatoms, Diatom, Diatom assemblages, Diatom cells, Diatom communities, Diatom taxa, Digestibility, Dominant diatom taxa, Ecology, Eichenberger schlatter, Epilithic, Epilithic communities, Epilithic habitats, Epilithic substrata, Estuarine sediments, Faecal, Faecal material, Faecal samples, Freshwater ecology, Grazer, Grazer faecal material, Grazer faecal samples, Grazers, Herbivorous insects, Intact chloroplasts, Jensen siegismund, Johannes satomi, Juniper knox, Lamberti resh, Larva, Larval faeces, Lower frequency, Minutissima, Neophylax autumnus, Other studies, Overalls creek, Relative abundances, Selectivity, Statistical analysis, Substrata, Substratum samples, Sumner mclntire, Taxon, Viable diatoms, Wilson holmes.
Abstract
SUMMARY 1. Grazing experiments were conducted in a small Kentucky stream to determine if epilithic diatom taxa differed in susceptibility to grazing by the larval caddisfly, Neophylax autumnus, and whether ingested taxa varied in digestibility. Live/dead ratios of diatom cells from N. autumnus faecal material were compared with live/dead ratios of cells taken from adjacent epilithic habitats to determine diatom digestibility. Selectivity was studied by comparing relative abundances of diatom taxa on substrata with the relative abundances of these taxa in grazer faecal material.
2. 73% of the diatoms collected from epilithic habitats contained intact chloroplasts and were characterized as live cells. Only 42% of diatoms eliminated in caddisfly faeces were living. The five dominant diatom taxa did not differ in digestibility. Elimination of viable diatoms in grazer faecal material may contribute to diatom drift in streams, and thus supply individuals for downstream recolonization. Failure to document live/dead ratios of diatoms from grazed substrata can lead to overestimation of the digestibility of taxa and misinterpretation of results.
3. Grazers in this investigation were more successful at ingesting large, high‐profile diatom taxa (i.e. Cymbella, Meridion and Gomphonema) and less able to remove small, adnate forms (Achnanthes minutissima). Such 'selectivity’may be one mechanism by which A. minutissima maintains dominance in this system.
Url:
DOI: 10.1111/j.1365-2427.1987.tb01330.x
Affiliations:
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ISTEX:47771E59BD540592E958B1E36C3EA3A16E1F8781Le document en format XML
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Grazing experiments were conducted in a small Kentucky stream to determine if epilithic diatom taxa differed in susceptibility to grazing by the larval caddisfly, Neophylax autumnus, and whether ingested taxa varied in digestibility. Live/dead ratios of diatom cells from N. autumnus faecal material were compared with live/dead ratios of cells taken from adjacent epilithic habitats to determine diatom digestibility. Selectivity was studied by comparing relative abundances of diatom taxa on substrata with the relative abundances of these taxa in grazer faecal material.</div><div type="abstract">2. 73% of the diatoms collected from epilithic habitats contained intact chloroplasts and were characterized as live cells. Only 42% of diatoms eliminated in caddisfly faeces were living. The five dominant diatom taxa did not differ in digestibility. Elimination of viable diatoms in grazer faecal material may contribute to diatom drift in streams, and thus supply individuals for downstream recolonization. Failure to document live/dead ratios of diatoms from grazed substrata can lead to overestimation of the digestibility of taxa and misinterpretation of results.</div><div type="abstract">3. Grazers in this investigation were more successful at ingesting large, high‐profile diatom taxa (i.e. Cymbella, Meridion and Gomphonema) and less able to remove small, adnate forms (Achnanthes minutissima). Such 'selectivity’may be one mechanism by which A. minutissima maintains dominance in this system.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Kentucky</li></region></list><tree><country name="États-Unis"><region name="Kentucky"><name sortKey="Peterson, Christopher G" sort="Peterson, Christopher G" uniqKey="Peterson C" first="Christopher G." last="Peterson">Christopher G. Peterson</name></region><name sortKey="Peterson, Christopher G" sort="Peterson, Christopher G" uniqKey="Peterson C" first="Christopher G." last="Peterson">Christopher G. Peterson</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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