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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.


Chlorophyll-a-based growth rate of monocultures and mixed cultures of M. aeruginosa (MIJAC), P. agardhii (PAT), and C. meneghiniana (CCAP) at two different temperatures (18°C and 30°C). Different letters represent significant differences at p < 0.05.
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fig6: Chlorophyll-a-based growth rate of monocultures and mixed cultures of M. aeruginosa (MIJAC), P. agardhii (PAT), and C. meneghiniana (CCAP) at two different temperatures (18°C and 30°C). Different letters represent significant differences at p < 0.05.

Mentions: Temperature also did not have an influence on competition among M. aeruginosa and other competitors. M. aeruginosa was a stronger exploitation/interference competitor (mixed culture) in both temperatures (Figures 3(a), 3(b), 4(a), and 4(b)). Although M. aeruginosa has showed reduced growth rates in the coculture with C. meneghiniana at 18°C, compared with the control (monoculture), it still won the competition. Lower temperatures favored the growth of C. meneghiniana both in monocultures and in mixed cultures, but its growth rate was still lower than that of M. aeruginosa in coculture (Figure 4(a)). P. agardhii inhibited the growth of C. meneghiniana at 18°C (Figure 5(a)) and stimulated it at 30°C (Figure 5(b)). The presence of C. meneghiniana increased the growth rate of P. agardhii at 18°C (Figure 5(a)) and none influence at 30°C was observed. In the three-mixed culture, P. agardhii and C. meneghiniana had their growth rates reduced in both temperatures. On the other hand, the presence of these two competitors did not influence M. aeruginosa growth (Figures 6(a) and 6(b)).


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)

Chlorophyll-a-based growth rate of monocultures and mixed cultures of M. aeruginosa (MIJAC), P. agardhii (PAT), and C. meneghiniana (CCAP) at two different temperatures (18°C and 30°C). Different letters represent significant differences at p < 0.05.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig6: Chlorophyll-a-based growth rate of monocultures and mixed cultures of M. aeruginosa (MIJAC), P. agardhii (PAT), and C. meneghiniana (CCAP) at two different temperatures (18°C and 30°C). Different letters represent significant differences at p < 0.05.
Mentions: Temperature also did not have an influence on competition among M. aeruginosa and other competitors. M. aeruginosa was a stronger exploitation/interference competitor (mixed culture) in both temperatures (Figures 3(a), 3(b), 4(a), and 4(b)). Although M. aeruginosa has showed reduced growth rates in the coculture with C. meneghiniana at 18°C, compared with the control (monoculture), it still won the competition. Lower temperatures favored the growth of C. meneghiniana both in monocultures and in mixed cultures, but its growth rate was still lower than that of M. aeruginosa in coculture (Figure 4(a)). P. agardhii inhibited the growth of C. meneghiniana at 18°C (Figure 5(a)) and stimulated it at 30°C (Figure 5(b)). The presence of C. meneghiniana increased the growth rate of P. agardhii at 18°C (Figure 5(a)) and none influence at 30°C was observed. In the three-mixed culture, P. agardhii and C. meneghiniana had their growth rates reduced in both temperatures. On the other hand, the presence of these two competitors did not influence M. aeruginosa growth (Figures 6(a) and 6(b)).

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.