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Titolo:
Density-dependent regulation of natural and laboratory rotifer populations
Autore:
Snell, TW; Dingmann, BJ; Serra, M;
Indirizzi:
Georgia Inst Technol, Sch Biol, Atlanta, GA 30332 USA Georgia Inst Technol Atlanta GA USA 30332 Sch Biol, Atlanta, GA 30332 USA Univ Valencia, Dept Ecol & Microbiol, E-46100 Valencia, Spain Univ Valencia Valencia Spain E-46100 Microbiol, E-46100 Valencia, Spain
Titolo Testata:
HYDROBIOLOGIA
, volume: 446, anno: 2001,
pagine: 39 - 44
SICI:
0018-8158(200103)446:<39:DRONAL>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTINUOUS-CULTURE; TIME-SERIES; BRACHIONUS; DYNAMICS; DAPHNIA;
Keywords:
population regulation; density-dependent; growth rates; models; food limitation; autotoxicity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Snell, TW Georgia Inst Technol, Sch Biol, Atlanta, GA 30332 USA Georgia Inst Technol Atlanta GA USA 30332 Atlanta, GA 30332 USA
Citazione:
T.W. Snell et al., "Density-dependent regulation of natural and laboratory rotifer populations", HYDROBIOL, 446, 2001, pp. 39-44

Abstract

Density-dependent regulation of abundance is fundamentally important in the dynamics of most animal populations. Density effects, however, have rarely been quantified in natural populations, so population models typically have a large uncertainty in their predictions. We used models generated from time series analysis to explore the form and strength of density-dependencein several natural rotifer populations. Population growth rate (r) decreased linearly or non-linearly with increased population density, depending onthe rotifer species. Density effects in natural populations reduced r to 0at densities of 1-10 l(-1) for 8 of the 9 rotifer species investigated. The sensitivities of these species to density effects appeared normally distributed, with a mean r=0 density of 2.3 l(-1) and a standard deviation of 1.9. Brachionus rotundiformis was the outlier with 10-100x higher density tolerance. Density effects in laboratory rotifer populations reduced r to 0 atpopulation densities of 10-100 ml(-1), which is 10(4) higher than densities in natural populations. Density effects in laboratory populations are dueto food limitation, autotoxicity or to their combined effects. Experimentswith B. rotundiformis demonstrated the absence of autotoxicity at densities as high as 865 ml(-1), a much higher density than observed in natural populations. It is, therefore, likely that food limitation rather than autotoxicity plays a major role in regulating natural rotifer populations.

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Documento generato il 30/11/20 alle ore 16:33:11