DENSITY‐DEPENDENT GROWTH, ECOLOGICAL STRATEGIES, AND EFFECTS OF NUTRIENTS AND SHADING ON BENTHIC DIATOM SUCCESSION IN STREAMS
Identifieur interne : 000A55 ( Main/Curation ); précédent : 000A54; suivant : 000A56DENSITY‐DEPENDENT GROWTH, ECOLOGICAL STRATEGIES, AND EFFECTS OF NUTRIENTS AND SHADING ON BENTHIC DIATOM SUCCESSION IN STREAMS
Auteurs : R. Jan Stevenson [États-Unis] ; Christopher G. Peterson [États-Unis] ; David B. Kirschtel [États-Unis] ; Christopher C. King [États-Unis] ; Nancy C. Tuchman [États-Unis]Source :
- Journal of Phycology [ 0022-3646 ] ; 1991-02.
Abstract
The importance of immigration, growth, and competition for nutrients and light in benthic diatom succession was studied in experimental channels in a low‐nutrient stream. Diatom accumulation was greater in channels enriched with nitrate and phosphate (NP) than in control channels, reaching about 5 × 106 and 2 × 106 cells‐cm−2, respectively, after 30 d. Shading during late stages of community development reduced algal standing crop. Synedra ulna (Nitz.) Ehr. and Achnanthes minutissima Kütz. were codominant during early stages of community development in both habitats, but succession to an A. minutissima‐dominated community was much faster in NP‐enriched than in control conditions. Species dominating early stages tended to immigrate quickly, whereas species that increased in relative abundance during community development had either fast growth rates or fast immigration and average growth rates. Decreases in growth rates indicated resource supply became limiting during community development in control and enriched channels. Density‐dependent competition was indicated because nutrient concentrations in the water column and light did not decrease during the 30‐d study. Species autecologies were defined by effects of nutrient enrichment, shading, and community development on species growth rates. Differing autecologies of early and late succession species indicated that competition for nutrients was more important than competition for light. Species autecologies also indicated ecological strategies. The species most stimulated by nutrient enrichment were least able to maintain growth rates as algal abundances on substrata increased. In addition, these species that best sustained their growth rates during succession tended to have the highest immigration rates, indicating that drift and immigration may have been an important mechanism of persistence for some populations when resources become limiting within thick benthic mats.
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DOI: 10.1111/j.0022-3646.1991.00059.x
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">DENSITY‐DEPENDENT GROWTH, ECOLOGICAL STRATEGIES, AND EFFECTS OF NUTRIENTS AND SHADING ON BENTHIC DIATOM SUCCESSION IN STREAMS</title><author><name sortKey="Stevenson, R Jan" sort="Stevenson, R Jan" uniqKey="Stevenson R" first="R. Jan" last="Stevenson">R. Jan Stevenson</name></author><author><name sortKey="Peterson, Christopher G" sort="Peterson, Christopher G" uniqKey="Peterson C" first="Christopher G." last="Peterson">Christopher G. Peterson</name></author><author><name sortKey="Kirschtel, David B" sort="Kirschtel, David B" uniqKey="Kirschtel D" first="David B." last="Kirschtel">David B. Kirschtel</name></author><author><name sortKey="King, Christopher C" sort="King, Christopher C" uniqKey="King C" first="Christopher C." last="King">Christopher C. 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Jan" last="Stevenson">R. Jan Stevenson</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><placeName><region type="state">Kentucky</region></placeName><wicri:cityArea>Department of Biology, University of Louisville, Louisville</wicri:cityArea></affiliation><affiliation></affiliation></author><author><name sortKey="Peterson, Christopher G" sort="Peterson, Christopher G" uniqKey="Peterson C" first="Christopher G." last="Peterson">Christopher G. Peterson</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><placeName><region type="state">Kentucky</region></placeName><wicri:cityArea>Department of Biology, University of Louisville, Louisville</wicri:cityArea></affiliation></author><author><name sortKey="Kirschtel, David B" sort="Kirschtel, David B" uniqKey="Kirschtel D" first="David B." last="Kirschtel">David B. 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Tuchman</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><placeName><region type="state">Kentucky</region></placeName><wicri:cityArea>Department of Biology, University of Louisville, Louisville</wicri:cityArea></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Journal of Phycology</title><title level="j" type="alt">JOURNAL OF PHYCOLOGY</title><idno type="ISSN">0022-3646</idno><idno type="eISSN">1529-8817</idno><imprint><biblScope unit="vol">27</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="59">59</biblScope><biblScope unit="page" to="69">69</biblScope><biblScope unit="page-count">11</biblScope><publisher>Blackwell Science Inc</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="1991-02">1991-02</date></imprint><idno type="ISSN">0022-3646</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-3646</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The importance of immigration, growth, and competition for nutrients and light in benthic diatom succession was studied in experimental channels in a low‐nutrient stream. Diatom accumulation was greater in channels enriched with nitrate and phosphate (NP) than in control channels, reaching about 5 × 106 and 2 × 106 cells‐cm−2, respectively, after 30 d. Shading during late stages of community development reduced algal standing crop. Synedra ulna (Nitz.) Ehr. and Achnanthes minutissima Kütz. were codominant during early stages of community development in both habitats, but succession to an A. minutissima‐dominated community was much faster in NP‐enriched than in control conditions. Species dominating early stages tended to immigrate quickly, whereas species that increased in relative abundance during community development had either fast growth rates or fast immigration and average growth rates. Decreases in growth rates indicated resource supply became limiting during community development in control and enriched channels. Density‐dependent competition was indicated because nutrient concentrations in the water column and light did not decrease during the 30‐d study. Species autecologies were defined by effects of nutrient enrichment, shading, and community development on species growth rates. Differing autecologies of early and late succession species indicated that competition for nutrients was more important than competition for light. Species autecologies also indicated ecological strategies. The species most stimulated by nutrient enrichment were least able to maintain growth rates as algal abundances on substrata increased. In addition, these species that best sustained their growth rates during succession tended to have the highest immigration rates, indicating that drift and immigration may have been an important mechanism of persistence for some populations when resources become limiting within thick benthic mats.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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