Aphanizomenon gracile increases in width in the presence of Daphnia. A defence mechanism against grazing?

Cerbin, Slawek; Wejnerowski, Łukasz; Dziuba, Marcin Krzysztof

doi:10.4081/jlimnol.2013.e41

Cited by 16 publications

(13 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, a long-term absence of grazers may remove the selection against mutation leading to increase the variability in filament thickness and abnormalities in cyanobacterial cultures. This view may be supported by previous studies of Cerbin et al, 2013, in which the thickness of the same strain of A. gracile increased after a 12-day exposure to daphnids and infochemicals of these animals.…”

Section: Discussionsupporting

confidence: 72%

Differences in cell wall of thin and thick filaments of cyanobacterium Aphanizomenon gracile SAG 31.79 and their implications for different resistance to Daphnia grazing

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Discussionsupporting

confidence: 72%

Differences in cell wall of thin and thick filaments of cyanobacterium Aphanizomenon gracile SAG 31.79 and their implications for different resistance to Daphnia grazing

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…in Daphnia's guts, while wider filaments became stuck and crowded closely together in the mouth. Moreover, Cerbin et al (2013) observed a widening of A. gracile's filaments in the presence of Daphnia, which was interpreted as a defence mechanism against grazing. These results suggest that filament width can shape the interactions between Daphnia and filamentous cyanobacteria.…”

Section: Introductionmentioning

confidence: 89%

Thicker filaments of Aphanizomenon gracile are more harmful to Daphnia than thinner Cylindrospermopsis raciborskii

2015

Self Cite

View full text Add to dashboard Cite

Background: Filamentous cyanobacteria are known to negatively affect the life history of planktonic herbivores through mechanical interference with filtering apparatus. Here, we hypothesise that not only the length but also the thickness of cyanobacterial filaments is an important factor shaping the life history of Daphnia. Results: To test our hypothesis, we cultured Daphnia magna with non-toxin-producing strains of either Aphanizomenon gracile or Cylindrospermopsis raciborskii. The former possesses wide filaments, whereas the latter has thinner filaments. The strain of A. gracile has two morphological forms differing in filament widths. The exposure to the thicker A. gracile filaments caused a stronger body-length reduction in females at maturity and a greater decrease in offspring number than exposure to the thinner C. raciborskii filaments. The width of filaments, however, did not significantly affect the length of newborns. The analysis of mixed thick and thin A. gracile filament width distribution revealed that D. magna reduces the number of thinner filaments, while the proportion of thicker ones increases. Also, the effects of cyanobacterial exudates alone were examined to determine whether the changes in D. magna life history were indeed caused directly by the physical presence of morphologically different filaments and not by confounding effects from metabolite exudation. This experiment demonstrated no negative effects of both A. gracile and C. raciborskii exudates. Conclusions: To our knowledge, this is the first study that demonstrates that the thickness of a cyanobacterial filament might be an important factor in shaping D. magna's life history. At a given biomass, thicker filaments of A. gracile were more detrimental to D. magna than thinner ones of C. raciborskii. There was also a strong interaction between species of the cyanobacterium and filament biomass, where species with thicker filaments and at higher biomass had the strongest negative impact on D. magna life history.

show abstract

“…In addition, it would be also worth studying how the present model could fit into the survival of filamentous MC-producing cyanobacteria e.g., Planktothrix agardhii, which are not known to form colonies. However, under some stress stimuli, P. agardhii can increase in width, which might be involved in an adaptive defense mechanism [107].…”

Section: Future Research Prospectsmentioning

confidence: 99%

Programmed Cell Death-Like and Accompanying Release of Microcystin in Freshwater Bloom-Forming Cyanobacterium Microcystis: From Identification to Ecological Relevance

Rzymski

2019

Toxins

View full text Add to dashboard Cite

Microcystis is the most common freshwater bloom-forming cyanobacterium. Its massive blooms not only adversely affect the functionality of aquatic ecosystems, but are also associated with the production of microcystins (MCs), a group of potent toxins that become a threat to public health when cell-bound MCs are significantly released from the dying Microcystis into the water column. Managing Microcystis blooms thus requires sufficient knowledge regarding both the cell death modes and the release of toxins. Recently, more and more studies have demonstrated the occurrence of programmed cell death-like (or apoptosis-like) events in laboratory and field samples of Microcystis. Apoptosis is a genetically controlled process that is essential for the development and survival of metazoa; however, it has been gradually realized to be an existing phenomenon playing important ecological roles in unicellular microorganisms. Here, we review the current progress and the existing knowledge gap regarding apoptosis-like death in Microcystis. Specifically, we focus first on the tools utilized to characterize the apoptosis-related biochemical and morphological features in Microcystis. We further outline various stressful stimuli that trigger the occurrence of apoptosis and discuss the potential mechanisms of apoptosis in Microcystis. We then propose a conceptual model to describe the functional coupling of apoptosis and MC in Microcystis. This model could be useful for understanding both roles of MC and apoptosis in this species. Lastly, we conclude the review by highlighting the current knowledge gap and considering the direction of future research. Overall, this review provides a recent update with respect to the knowledge of apoptosis in Microcystis and also offers a guide for future investigations of its ecology and survival strategies.

show abstract

Aphanizomenon gracile increases in width in the presence of Daphnia. A defence mechanism against grazing?

Abstract: ABSTRACT

Cited by 16 publications

References 38 publications

Differences in cell wall of thin and thick filaments of cyanobacterium Aphanizomenon gracile SAG 31.79 and their implications for different resistance to Daphnia grazing

Differences in cell wall of thin and thick filaments of cyanobacterium Aphanizomenon gracile SAG 31.79 and their implications for different resistance to Daphnia grazing

Thicker filaments of Aphanizomenon gracile are more harmful to Daphnia than thinner Cylindrospermopsis raciborskii

Programmed Cell Death-Like and Accompanying Release of Microcystin in Freshwater Bloom-Forming Cyanobacterium Microcystis: From Identification to Ecological Relevance

Contact Info

Product

Resources

About