Effect of salinity and food concentration on competition between Brachionus plicatilis Müller, 1786 and Brachionus calyciflorus Pallas, 1776 (Rotifera)
| Autor: | Noelia Soledad Ferrando, S. Nandini, S. S. S. Sarma, Maria Cristina Claps |
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| Rok vydání: | 2020 |
| Předmět: |
FOOD DENSITY
ROTIFERS Biomass (ecology) Ecology biology media_common.quotation_subject GROWTH RATES Zoology Biología Marina Limnología Aquatic Science Brachionus Plankton Oceanography biology.organism_classification Competition (biology) Spatial heterogeneity Ciencias Biológicas Salinity Brachionus calyciflorus PLANKTON Eutrophication CIENCIAS NATURALES Y EXACTAS Ecology Evolution Behavior and Systematics media_common |
| Zdroj: | Marine and Freshwater Research. 71:493 |
| ISSN: | 1323-1650 |
| DOI: | 10.1071/mf18403 |
| Popis: | Natural populations of planktonic rotifers are affected by salinity and food density, among other stressors. Moreover, competition among congeneric species limits the abundance of certain rotifers in ecosystems without spatial heterogeneity and environmental fluctuations. We isolated Brachionus plicatilis and Brachionus calyciflorus from Salado River basin waterbodies and studied the demographic characteristics and competition between them at three salinity levels (0.75, 1.75 and 2.75 g L-1 NaCl) and at two food concentrations (0.1 × 106 and 0.5 × 106 cells mL-1 Chlorella vulgaris). The lowest salinity level proved to be unfavourable for the population growth of B. plicatilis, but at higher salinity levels the growth was similar to that of controls (without competition), even in the presence of the competitor and at either food concentration. By contrast, the competitor almost always decreased the density of B. calyciflorus. Salinity greatly affected the peak density of B. plicatilis, whereas the effects of salinity and competition on B. calyciflorus were similar. Biomass was inversely related to salinity for both species, and was significantly affected by competition in B. plicatilis. These results show that B. calyciflorus is more adversely affected than B. plicatilis by competition and high salinity, and explain why both species can coexist in eutrophic saline lowland rivers and pampean shallow lakes. Fil: Ferrando, Noelia Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología "Dr. Raúl A. Ringuelet". Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Limnología; Argentina Fil: Nandini, S.. Universidad Nacional Autónoma de México; México Fil: Claps, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología "Dr. Raúl A. Ringuelet". Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Limnología; Argentina Fil: Sarma, S. S. S.. Universidad Nacional Autónoma de México; México |
| Databáze: | OpenAIRE |
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