The invasion success of the cyanobacterium Cylindrospermopsis raciborskii in experimental mesocosms: genetic identity, grazing loss, competition and biotic resistance

Weithoff, Guntram; Taube, Anne; Bolius, Sarah

doi:10.3391/ai.2017.12.3.07

Cited by 10 publications

(24 citation statements)

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“…A similar decline of an invasive phytoplankton species entering a new habitat was observed in a study by Weithoff et al. (). The authors tested which mechanism (consumptive or competitive resistance) prevents a successful invasion of three isolates of the cyanobacterium Cylindrospermopsis raciborskii in a natural freshwater system.…”

Section: Discussionsupporting

confidence: 85%

“…Two isolates of C. raciborskii were unable to invade the community, but the temporary abundance of C. raciborskii significantly changed the resident communities with and without grazing pressure (Weithoff et al. ). Under natural conditions, a rapid change of environmental conditions is likely and can act as a selective force during an invasion process (Weithoff et al.…”

Section: Discussionmentioning

confidence: 99%

“…Under natural conditions, a rapid change of environmental conditions is likely and can act as a selective force during an invasion process (Weithoff et al. ) leading to unsuccessful invasions.…”

Section: Discussionmentioning

confidence: 99%

“…() predicted crucial effects of unsuccessful invaders on resident communities and one experimental study found, after a failed invasion, lasting effects on the resident phytoplankton community (Weithoff et al. ). According to the results of the model of Case (), we also found a changed competition situation in the resident community, which favored a non‐dominant species (e.g., Ankristodesmus sp.).…”

Section: Discussionmentioning

confidence: 99%

“…This is due to potentially stronger trophic cascades in freshwater systems than in terrestrial ones (Weithoff et al. ). It was shown that consumptive resistance makes natural phytoplankton communities more resistant to a successful invasion of C. raciborskii (Weithoff et al.…”

Section: Discussionmentioning

confidence: 99%

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Unsuccessful invaders structure a natural freshwater phytoplankton community

Buchberger

Stockenreiter

2018

Ecosphere

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Species invasion dynamics are a core topic in ecology and the effects of species invasions on ecosystems are well described. However, the knowledge about the mechanisms during the invasion process itself is limited. Many interactions between invaders and resident species occur during the invasion process. These interactions influence individual species abundance and subsequently community composition. Even though invaders are often unsuccessful, the very short interactions with the resident species can influence species abundances and therefore community composition. The prominent effects of unsuccessful invaders on community composition were already predicted in a theoretical model. To empirically test the effect of such unsuccessful invaders on a resident phytoplankton community, we conducted a mesocosm experiment in a mesotrophic freshwater pond. Six freshwater algae belonging to three taxonomic groups (chlorophyta, cyanobacteria, and bacillariophyta) were added as potential invader species to the natural phytoplankton community of the pond (as single species or as combination of two species of the same taxonomic group). After nine days, the invasion success and the impact on the natural phytoplankton community were estimated. Results show that although all invaders were unsuccessful, they had lasting effects on the resident community. In all communities exposed to invasion, biodiversity (H′) was maintained. In contrast, in control communities, the diversity at the end of the experiment was lower compared to the initial community. Furthermore, communities exposed to invasion were less similar to control communities without invasion than to the other invaded communities. Differences were found in taxonomic group composition as well as in species composition. Additionally, we found evidence for synergistic effects between the combined added species. Our results give clear evidence of strong transient effects of unsuccessful invaders on freshwater phytoplankton community composition.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Unsuccessful invaders structure a natural freshwater phytoplankton community

Buchberger

Stockenreiter

2018

Ecosphere

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Life-history responses of Daphnia sinensis simultaneously exposed to Microcystis aeruginosa and Cylindrospermopsis raciborskii

et al. 2020

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Low invasion success of an invasive cyanobacterium in a chlorophyte dominated lake

Bolius

Wiedner

Weithoff

2019

Sci Rep

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Biological invasions are a major threat to biodiversity and ecosystem functioning. Successful invasions depend on the interplay of multiple abiotic and biotic factors, however, the process of the invasion itself is often overlooked. The temporal variation of environmental factors suggests that a ‘window of opportunity’ for successful invasions exists. Especially aquatic habitats, like temperate lakes, undergo pronounced seasonal fluctuations and show temporally varying environmental conditions in e.g. nutrient availability, temperature and the composition of the resident community including competitors and consumers. We experimentally tested if an invasion window for the globally invasive cyanobacterium Cylindrospermopsis raciborskii exists. From May to September, we determined the invasion success of C . raciborskii in laboratory mesocosms with natural lake water. Although the invasion success was generally low, the invasiveness varied among months and differed in total invasive biomass, net development and final share of C . raciborskii in the community. During the first days, C . raciborskii strongly declined and this initial, short-term decline was independent of the ambient consumptive pressure. These results are in contrast to laboratory studies in which C . raciborskii successfully invaded, suggesting that a complex natural system develops a resistance to invasions.

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The invasion success of the cyanobacterium Cylindrospermopsis raciborskii in experimental mesocosms: genetic identity, grazing loss, competition and biotic resistance

Cited by 10 publications

References 0 publications

Unsuccessful invaders structure a natural freshwater phytoplankton community

Unsuccessful invaders structure a natural freshwater phytoplankton community

Life-history responses of Daphnia sinensis simultaneously exposed to Microcystis aeruginosa and Cylindrospermopsis raciborskii

Low invasion success of an invasive cyanobacterium in a chlorophyte dominated lake

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