Benthic fauna affects recruitment from sediments of the harmful cyanobacterium Nodularia spumigena

Karlson, Agnes M. L.; Nascimento, Francisco J. A.; Suikkanen, Sanna; Elmgren, Ragnar

doi:10.1016/j.hal.2012.09.001

Cited by 14 publications

(9 citation statements)

References 51 publications

(60 reference statements)

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“…The viability of akinetes can also be affected during overwintering, for example, through bioturbation by invertebrates, which can reduce the pool of intact akinetes (31,32). To a lesser extent, parasitism is also a factor in the sediment compartment (33).…”

Section: Discussionmentioning

confidence: 99%

Akinetes May Be Representative of Past Nostocalean Blooms: a Case Study of Their Benthic Spatiotemporal Distribution and Potential for Germination in a Eutrophic Lake

Legrand

Jeune

Colombet

et al. 2017

Appl Environ Microbiol

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Monitoring of water and surface sediment in a French eutrophic lake (Lake Aydat) was carried out over a 2-year period in order to determine whether akinetes in sediment could be representative of the most recent bloom and to estimate their germination potential. Sediment analysis revealed two akinete species, and, present in the same proportions as observed for the pelagic populations. Moreover, similar spatial patterns observed for vegetative cells in the water column and akinete distributions in the sediment suggest that akinetes in the sediment may be representative of the previous bloom. However, the relationship between akinetes in the sediment and vegetative cells in the water column was not linear, and other factors may interfere. For example, our results highlighted horizontal transport of akinetes during the winter. The benthic overwinter phase did not seem to influence the percentages of intact akinetes, which remained stable at approximately 7% and 60% for and, respectively. These percentages may thus be the result of processes that occurred in the water column. The intact overwintering akinetes showed germination rates of up to 90% after 72 h for or 144 h for The difference in akinete germination rates between these two species demonstrates different ecological strategies, which serve to expand the window for germination in time and space and thus optimize colonization of the water column by nostocalean cyanobacteria. Cyanobacteria have the ability to proliferate and to form blooms. These blooms can then affect the local ecology, health, and economy. The akinete, a resistant cell type that persists in sediment, is an important intermediate phase between previous and future blooms. We monitored the water column and the surface sediment of a French eutrophic lake (Lake Aydat) to investigate the relationship between vegetative cells in the water column and akinetes in the sediment. This study focused on the characterization of spatiotemporal akinete distributions, cellular integrity, and germination potential. Species-specific ecological strategies were highlighted and may partly explain the temporal succession of species in the water column. Akinetes may also be used to understand past nostocalean blooms and to predict future ones.

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Section: Discussionmentioning

confidence: 99%

Akinetes May Be Representative of Past Nostocalean Blooms: a Case Study of Their Benthic Spatiotemporal Distribution and Potential for Germination in a Eutrophic Lake

Legrand

Jeune

Colombet

et al. 2017

Appl Environ Microbiol

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“…On the other hand, several recent studies have suggested positive effects of the M. cf. arctia invasion in deeper areas of the Baltic Sea, including enhanced long-term retention of phosphorus in sediments through increased oxygenation 53 , burial of fresh detritus deeper in the sediment where mineralization is lower 21 54 and suppressed cyanobacterial recruitment 55 56 , counteracting eutrophication symptoms. Finally, as discussed above, the results of our field study and the earlier experiment with M. arctia 21 indicate that this invader and the native species show resource partitioning that may enhance resource usage and energy transfer efficiency through broadening the community's trophic niche.…”

Section: Discussionmentioning

confidence: 99%

Do deposit-feeders compete? Isotopic niche analysis of an invasion in a species-poor system

Karlson

Gorokhova

Elmgren

2015

Sci Rep

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Successful establishment of invasive species is often related to the existence of vacant niches. Competition occurs when invaders use the same limiting resources as members of the recipient community, which will be reflected in some overlap of their trophic niches. The concept of isotopic niche has been used to study trophic niche partitioning among species. Here, we present a two-year field study comparing isotopic niches of the deposit-feeding community in a naturally species-poor system. The isotopic niche analyses showed no overlap between a recent polychaete invader and any of the native species suggesting that it has occupied a vacant niche. Its narrow isotopic niche suggests specialized feeding, however, the high δ15N values compared to natives are most likely due to isotope fractionation effects related to nitrogen recycling and a mismatch between biological stoichiometry of the polychaete and the sediment nitrogen content. Notably, highly overlapping isotopic niches were inferred for the native species, which is surprising in a food-limited system. Therefore, our results demonstrate that invaders may broaden the community trophic diversity and enhance resource utilization, but also raise questions about the congruence between trophic and isotopic niche concepts and call for careful examination of assumptions underlying isotopic niche interpretation.

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“…and to some extent also N . spumigena depend on recruitment from benthic resting stages, akinetes, which are deposited in sediments after the bloom (Suikkanen et al 2010 ) and can be affected by deposit-feeders (Karlson et al 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen fixation by cyanobacteria stimulates production in Baltic food webs

Karlson

Duberg

Motwani

et al. 2015

AMBIO

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102

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Filamentous, nitrogen-fixing cyanobacteria form extensive summer blooms in the Baltic Sea. Their ability to fix dissolved N2 allows cyanobacteria to circumvent the general summer nitrogen limitation, while also generating a supply of novel bioavailable nitrogen for the food web. However, the fate of the nitrogen fixed by cyanobacteria remains unresolved, as does its importance for secondary production in the Baltic Sea. Here, we synthesize recent experimental and field studies providing strong empirical evidence that cyanobacterial nitrogen is efficiently assimilated and transferred in Baltic food webs via two major pathways: directly by grazing on fresh or decaying cyanobacteria and indirectly through the uptake by other phytoplankton and microbes of bioavailable nitrogen exuded from cyanobacterial cells. This information is an essential step toward guiding nutrient management to minimize noxious blooms without overly reducing secondary production, and ultimately most probably fish production in the Baltic Sea.Electronic supplementary materialThe online version of this article (doi:10.1007/s13280-015-0660-x) contains supplementary material, which is available to authorized users.

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Benthic fauna affects recruitment from sediments of the harmful cyanobacterium Nodularia spumigena

Cited by 14 publications

References 51 publications

Akinetes May Be Representative of Past Nostocalean Blooms: a Case Study of Their Benthic Spatiotemporal Distribution and Potential for Germination in a Eutrophic Lake

Akinetes May Be Representative of Past Nostocalean Blooms: a Case Study of Their Benthic Spatiotemporal Distribution and Potential for Germination in a Eutrophic Lake

Do deposit-feeders compete? Isotopic niche analysis of an invasion in a species-poor system

Nitrogen fixation by cyanobacteria stimulates production in Baltic food webs

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