2017
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Metapopulation theory identifies biogeographical patterns among core and satellite marine bacteria scaling from tens to thousands of kilometers: Applied metapopulation theory for marine microbes

År: 2017

Metapopulation theory identifies biogeographical patterns among core and satellite marine bacteria scaling from tens to thousands of kilometers: Applied metapopulation theory for marine microbes

Lindh, M. V., Sjöstedt, J., Ekstam, B., Casini, M., Lundin, D., Hugerth, L. W., Hu, Y. O. O., Andersson, A. F., Andersson, A., Legrand, C. & Pinhassi, J. 2017 In : Environmental Microbiology. 19, 3, p. 1222-1236

Publication: Research - peer-reviewJournal article – Annual report year: 2017

Metapopulation theory developed in terrestrial ecology provides applicable frameworks for interpreting the role of local and regional processes in shaping species distribution patterns. Yet, empirical testing of metapopulation models on microbial communities is essentially lacking. We determined regional bacterioplankton dynamics from monthly transect sampling in the Baltic Sea Proper using 16S rRNA gene sequencing. A strong positive trend was found between local relative abundance and occupancy of populations. Notably, the occupancy-frequency distributions were significantly bimodal with a satellite mode of rare endemic populations and a core mode of abundant cosmopolitan populations (e.g. Synechococcus, SAR11 and SAR86 clade members). Temporal changes in population distributions supported several theoretical frameworks. Still, bimodality was found among bacterioplankton communities across the entire Baltic Sea, and was also frequent in globally distributed datasets. Datasets spanning waters with widely different physicochemical characteristics or environmental gradients typically lacked significant bimodal patterns. When such datasets were divided into subsets with coherent environmental conditions, bimodal patterns emerged, highlighting the importance of positive feedbacks between local abundance and occupancy within specific biomes. Thus, metapopulation theory applied to microbial biogeography can provide novel insights into the mechanisms governing shifts in biodiversity resulting from natural or anthropogenically induced changes in the environment.
Original languageEnglish
JournalEnvironmental Microbiology
Volume19
Issue number3
Pages (from-to)1222-1236
ISSN1462-2912
DOIs
StatePublished - 2017

 

Inclusion of ecological, economic, social, and institutional considerations when setting targets and limits for multispecies fisheries: Introduction to the Symposium: ‘Targets and Limits for Long Term Fisheries Management’ Quo Vadimus

År: 2017

Inclusion of ecological, economic, social, and institutional considerations when setting targets and limits for multispecies fisheries: Introduction to the Symposium: ‘Targets and Limits for Long Term Fisheries Management’ Quo Vadimus

Rindorf, A., Dichmont, C. M., Thorson, J. T., Thorson, J. T., Worsøe Clausen, L., Degnbol, P., Garcia, D., Hintzen, N. T., Kempf, A., Levin, P., Mace, P., Maravelias, C. D., Minto, C., Mumford, J., Pascoe, S., Prellezo, R., Punt, A. E., Reid, D. G., Röckmann, C., Stephenson, R. L., Thebaud, O., Tserpes, G. & Voss, R. 2017 In : ICES Journal of Marine Science. 74, 2, p. 453-463

Publication: Research - peer-reviewJournal article – Annual report year: 2017

Original languageEnglish
JournalICES Journal of Marine Science
Volume74
Issue number2
Pages (from-to)453-463
ISSN1054-3139
DOIs
StatePublished - 2017

 

Consequences of eye fluke infection on anti-predator behaviours in invasive round gobies in Kalmar Sound

År: 2017

Consequences of eye fluke infection on anti-predator behaviours in invasive round gobies in Kalmar Sound

Flink, H., Behrens, J. W. & Svensson, P. A. 2017 In : Parasitology Research. 11 p.

Publication: Research - peer-reviewJournal article – Annual report year: 2017

Larvae of the eye fluke, Diplostomum, emerge from snails and infect fish by penetrating skin or gills, then move to the lens where they may impair the vision of the fish. For the fluke to reproduce, a bird must eat the infected fish, and it has been suggested that they therefore actively manipulate the fish’s behaviour to increase the risk of predation. We found that round gobies Neogobius melanostomus, a species that was recently introduced to the Kalmar Sound of the Baltic Sea, had an eye fluke prevalence of 90–100%. We investigated how the infection related to behavioural variation in round gobies. Our results showed that the more intense the parasite-induced cataract, the weaker the host’s response was to simulated avian attack. The eye flukes did not impair other potentially important anti-predator behaviours, such as shelter use, boldness and the preference for shade. Our results are in accordance with the suggestion that parasites induce changes in host behaviour that will facilitate transfer to their final host.

Original languageEnglish
JournalParasitology Research
Number of pages11
ISSN0932-0113
DOIs
StateAccepted/In press - 2017

 

Disentangling the counteracting effects of water content and carbon mass on zooplankton growth

År: 2017

Disentangling the counteracting effects of water content and carbon mass on zooplankton growth

Mcconville, K., Atkinson, A., Fileman, E. S., Spicer, J. I. & Hirst, A. G. 2017 In : Journal of Plankton Research. 39, 2, p. 246-256

Publication: Research - peer-reviewJournal article – Annual report year: 2017

Zooplankton vary widely in carbon percentage (carbon mass as a percentage of wet mass), but are often described as either gelatinous or non-gelatinous. Here we update datasets of carbon percentage and growth rate to investigate whether carbon percentage is a continuous trait, and whether its inclusion improves zooplankton growth models. We found that carbon percentage is continuous, but that species are not distributed homogenously along this axis. To assess variability of this trait in situ, we investigated the distribution of biomass across the range of carbon percentage for a zooplankton time series at station L4 off Plymouth, UK. This showed separate biomass peaks for gelatinous and crustacean taxa, however, carbon percentage varied 8-fold within the gelatinous group. Species with high carbon mass had lower carbon percentage, allowing separation of the counteracting effects of these two variables on growth rate. Specific growth rates, g (d -1) were negatively related to carbon percentage and carbon mass, even in the gelatinous taxa alone, suggesting that the trend is not driven by a categorical difference between these groups. The addition of carbon percentage doubled the explanatory power of growth models based on mass alone, demonstrating the benefits of considering carbon percentage as a continuous trait.

Original languageEnglish
JournalJournal of Plankton Research
Volume39
Issue number2
Pages (from-to)246-256
ISSN0142-7873
DOIs
StatePublished - 2017

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Konsekvensvurdering af fiskeri efter blåmuslinger ved og øst for Horsens Fjord samt Endelave 2017

År: 2017

Original languageDanish
PublisherInstitut for Akvatiske Ressourcer, Danmarks Tekniske Universitet
Number of pages46
ISBN (electronic)978-87-7481-236-4
StatePublished - 2017
SeriesDTU Aqua-rapport
Number319-2017