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Temperature Effect on Exploitation and Interference Competition among Microcystis aeruginosa, Planktothrix agardhii and, Cyclotella meneghiniana.

Gomes AM, de Oliveira e Azevedo SM, Lürling M - ScientificWorldJournal (2015)

Bottom Line: The temperature did not influence exploitation competition between MIJAC and other competitors and it was the best competitor in both temperatures.The growth of MIJAC was favored in strains exudates at 30°C, while CCAP was favored at 18°C, revealing that the optimum growth temperature was important to establish the competitive superiority.Therefore, we can propose two hypotheses: (i) different temperatures may results in production of distinct compounds that influence the competition among phytoplankton species and (ii) the target species may have different vulnerability to these compounds depending on the temperature.

View Article: PubMed Central - PubMed

Affiliation: Laboratório de Ecofisiologia e Toxicologia de Cianobactérias, IBCCF, Universidade Federal do Rio de Janeiro, CCS, Bloco G, 21949-900 Rio de Janeiro, RJ, Brazil ; Laboratório de Botânica, Instituto de Recursos Naturais, Universidade Federal de Itajubá, Avenida BPS 1303, Pinheirinho, 37500-903 Itajubá, MG, Brazil.

ABSTRACT
We studied the effect of temperature (18 and 30°C) on growth and on the exploitation and interference competition of three species: Microcystis aeruginosa (MIJAC), Planktothrix agardhii (PAT), and Cyclotella meneghiniana (CCAP). Coculturing the organisms in batch systems allowed for the examination of both competitive interactions, while the interference competition was studied in cross-cultures. The experiments were done during 10-12 days, and samples were taken for chlorophyll-a analysis, using PHYTO-PAM. The temperature did not influence exploitation competition between MIJAC and other competitors and it was the best competitor in both temperatures. PAT presented higher growth rates than CCAP in competition at 18 and 30°C. The temperature influenced the interference competition. The growth of MIJAC was favored in strains exudates at 30°C, while CCAP was favored at 18°C, revealing that the optimum growth temperature was important to establish the competitive superiority. Therefore, we can propose two hypotheses: (i) different temperatures may results in production of distinct compounds that influence the competition among phytoplankton species and (ii) the target species may have different vulnerability to these compounds depending on the temperature. At last, we suggest that both the sensitivity and the physiological status of competing species can determine their lasting coexistence.

No MeSH data available.


Experimental design of temperature effect on monoculture growth and direct and indirect competition among Microcystis aeruginosa, Planktothrix agardhii, and Cyclotella meneghiniana.
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Related In: Results  -  Collection


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fig1: Experimental design of temperature effect on monoculture growth and direct and indirect competition among Microcystis aeruginosa, Planktothrix agardhii, and Cyclotella meneghiniana.

Mentions: The experimental set was carried out as described below: (a) MIJAC growth on PAT monoculture exudate, (b) MIJAC growth on CCAP monoculture exudate, (c) PAT growth on MIJAC monoculture exudate, (d) PAT growth on CCAP monoculture exudate, (e) CCAP growth on MIJAC monoculture exudate, (f) CCAP growth on PAT monoculture exudate, (g) growth of the three monospecific strains in their own exudates, and (h) each strain growth on MIJAC, PAT, and CCAP mixed culture exudate (the experimental design is in Figure 1). The monoculture of each strain grown in modified WC medium was used as control. The initial biomass of the target strain was 107 μm3·mL−1. The culture condition was the same one described above. The experiments were performed in triplicate and the growth was monitored during 12 days by analyzing the chlorophyll-a concentrations using the PHYTO-PAM phytoplankton analyzer on days 0, 2, 4, 6, 8, 10, and 12.


Temperature Effect on Exploitation and Interference Competition among Microcystis aeruginosa, Planktothrix agardhii and, Cyclotella meneghiniana.

Gomes AM, de Oliveira e Azevedo SM, Lürling M - ScientificWorldJournal (2015)

Experimental design of temperature effect on monoculture growth and direct and indirect competition among Microcystis aeruginosa, Planktothrix agardhii, and Cyclotella meneghiniana.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4561989&req=5

fig1: Experimental design of temperature effect on monoculture growth and direct and indirect competition among Microcystis aeruginosa, Planktothrix agardhii, and Cyclotella meneghiniana.
Mentions: The experimental set was carried out as described below: (a) MIJAC growth on PAT monoculture exudate, (b) MIJAC growth on CCAP monoculture exudate, (c) PAT growth on MIJAC monoculture exudate, (d) PAT growth on CCAP monoculture exudate, (e) CCAP growth on MIJAC monoculture exudate, (f) CCAP growth on PAT monoculture exudate, (g) growth of the three monospecific strains in their own exudates, and (h) each strain growth on MIJAC, PAT, and CCAP mixed culture exudate (the experimental design is in Figure 1). The monoculture of each strain grown in modified WC medium was used as control. The initial biomass of the target strain was 107 μm3·mL−1. The culture condition was the same one described above. The experiments were performed in triplicate and the growth was monitored during 12 days by analyzing the chlorophyll-a concentrations using the PHYTO-PAM phytoplankton analyzer on days 0, 2, 4, 6, 8, 10, and 12.

Bottom Line: The temperature did not influence exploitation competition between MIJAC and other competitors and it was the best competitor in both temperatures.The growth of MIJAC was favored in strains exudates at 30°C, while CCAP was favored at 18°C, revealing that the optimum growth temperature was important to establish the competitive superiority.Therefore, we can propose two hypotheses: (i) different temperatures may results in production of distinct compounds that influence the competition among phytoplankton species and (ii) the target species may have different vulnerability to these compounds depending on the temperature.

View Article: PubMed Central - PubMed

Affiliation: Laboratório de Ecofisiologia e Toxicologia de Cianobactérias, IBCCF, Universidade Federal do Rio de Janeiro, CCS, Bloco G, 21949-900 Rio de Janeiro, RJ, Brazil ; Laboratório de Botânica, Instituto de Recursos Naturais, Universidade Federal de Itajubá, Avenida BPS 1303, Pinheirinho, 37500-903 Itajubá, MG, Brazil.

ABSTRACT
We studied the effect of temperature (18 and 30°C) on growth and on the exploitation and interference competition of three species: Microcystis aeruginosa (MIJAC), Planktothrix agardhii (PAT), and Cyclotella meneghiniana (CCAP). Coculturing the organisms in batch systems allowed for the examination of both competitive interactions, while the interference competition was studied in cross-cultures. The experiments were done during 10-12 days, and samples were taken for chlorophyll-a analysis, using PHYTO-PAM. The temperature did not influence exploitation competition between MIJAC and other competitors and it was the best competitor in both temperatures. PAT presented higher growth rates than CCAP in competition at 18 and 30°C. The temperature influenced the interference competition. The growth of MIJAC was favored in strains exudates at 30°C, while CCAP was favored at 18°C, revealing that the optimum growth temperature was important to establish the competitive superiority. Therefore, we can propose two hypotheses: (i) different temperatures may results in production of distinct compounds that influence the competition among phytoplankton species and (ii) the target species may have different vulnerability to these compounds depending on the temperature. At last, we suggest that both the sensitivity and the physiological status of competing species can determine their lasting coexistence.

No MeSH data available.