Katri Aarnio

Katri Aarnio
Åbo Akademi University · Department of Biosciences

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30
Publications
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875
Citations
Citations since 2017
1 Research Item
268 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050

Publications

Publications (30)
Article
Full-text available
The food web positioning of the non-native round goby (Neogobius melanostomus Pallas, 1814) was studied in a new invasive population in Mariehamn, Åland Islands (northern Baltic Sea). The trophic position and isotopic niche space was compared to other benthic-feeding fish species in the same habitat. The trophic position (TP) was estimated based on...
Article
Species-specific foraging habits or feeding preferences influence the overall trophic functioning in consumer assemblages. We set out to assess the in situ trophic diversity in a mesograzer assemblage (isopods, amphipods and gastropods) associated with marine littoral macroalgae. More specifically, we set out to establish whether stable isotope rat...
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Full-text available
Identifying resource use and functional traits of non-indigenous species are promising means to increase the ability to predict ecological consequences of invasions. One of the most widely spread brachyuran crab species, and a recent invader in the northern Baltic Sea, is the North American Harris mud crab, Rhithropanopeus harrisii (Gould, 1841). A...
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To understand the consequences of changes in diversity we need to consider the functional characteristics (traits) of species, as well as the trophic setting the taxa are part of. These two approaches have rarely been conducted in an integrated manner, although we know that trophic structure is an important driver of community functioning, and that...
Article
Full-text available
The green alga Cladophora glomerata (L.) is a common macrophyte in the northern Baltic Sea, where it forms drifting mats during summer. We studied the effect of its stage of decomposition on the density, diversity, and resource usage of associated meio- and macrofauna. We hypothesised that mobile species would show small variation in food preferenc...
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We conducted a laboratory experiment to investigate the effects of drifting algal conglomerates on meiofauna and how its response to the presence of various macrobenthic species was modified by them. We mimicked a situation which is common in the archipelago area of the Baltic Sea, where algal mats become stagnant in shallow embayments, covering wi...
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The European Water Framework Directive (EC WFD/2000/60) states that all coastal surface waters should achieve Good ecological status by the year 2015. For this purpose waterbodies have been classified, and a subsequent step is to establish monitoring and management plans for each waterbody. We assess what is an optimal, cost-effective sampling desi...
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The EC Water Frame Directive (WFD) states that all coastal water bodies must achieve ‘good ecological status’ by the year 2015. A range of different classification methods have been developed and used to define ecological status to support the WFD. The aim of this study was to compare the effects of using two different mesh sizes of sieve (1.0 and...
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The short ecological history and the environmental conditions characterising the Baltic Sea make it inhabitable for only few species, resulting in a functional poverty of the system (number of functional groups and number of species within each group). Thus, it is a well-suited system for studies on biodiversity and ecosystem functions, particularl...
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Trophic interactions are not static links, but are dynamic both in space and time. In temperate environments, seasonal patterns in primary production may be pronounced and, hence, the zoobenthic community and the trophic couplings within it change during the main production season. We assessed temporal variability in a benthic food web using stable...
Article
Competition for food is generally thought to exert a strong evolutionary pressure, driving trophic niche separation, either by specialization and/or by widening the choice of potential food resources. Harpacticoid copepods are common inhabitants of phytal assemblages, where several closely related species of the so-called phytal dwelling families o...
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We conducted a microcosm experiment to evaluate the capability of fauna inhabiting or being transported by drifting filamentous algae to colonize defaunated sediment. We expected meiofauna would perform a quicker and more effective re-colonization of disturbed areas by means of the algal mats than their macrofaunal counterparts. Similarly, within m...
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The current published information of the influence of eutrophication on the Baltic Sea is reviewed and summarized. Harmful effects at different levels of the ecosystem are identified, and the spatial and temporal variability of these properties characterized. The Baltic Marine Environment Bibliography was searched on the web, and some 1170 referenc...
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Due to increasing eutrophication of the coastal Baltic waters, drifting algae are a common phenomenon. Drifting algal mats accumulate on shallow sandy bottoms in late summer and autumn, and affect the ambient fauna. Juvenile flounder, Platichthys flesus, utilize these habitats during their first few years. They feed on benthic meio- and macrofauna;...
Article
In the northern Baltic Sea juvenile flounder, Platichthys flesus, occur in high abundances on shallow sandy bottoms in late summer and autumn. They feed mainly on meiofauna and the ontogenetic switch to macrofaunal sized food occurs at a larger size here than in other areas, exemplifying the high relative importance of meiofauna. Consequently, juve...
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Marine Ecology Progress Series, vol. 163, 145-153 Priapulids are potentially important in structuring soft-bottom communities in temperate and arctic regions, and this study is the first attempt to evaluate their importance in zoobenthic communities. Halicryptus spinulosus is an important component of the zoobenthos to the northern Baltic Sea. It i...
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We studied the resistance of benthic prey organisms (Ostracoda, Hydrobia spp., Macoma balthica) to digestion by juvenile flounder, Platichthys flesus (L.), in a series of aquarium experiments. Results showed that some food species are able to survive the gut passage (Ostracoda 53 to 75%, Hydrobia spp. 46 to 92%). This has ecological implications, a...
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The food choice of juvenile flounder (Platichthys flesus) and turbot (Scophthalmus maximus) was studied in the northern Baltic Sea during the years 1988, 1989, 1994 and 1995. The diet included organisms from 30 species/taxa in flounder (n = 306) and 10 species/taxa in turbot (n = 41). Flounder ⩽ 45 mm mainly consumed meiofauna (dominating taxon: Ha...
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Ophelia, ISSN 0078-5326, vol. 37, nr. 1, 19-30 In shallow, soft-bottom benthic communities meiofauna is as important as macrofauna, with regard to both biomass and production. Shallow bottoms are also important as feeding habitats for the sand goby Pomatoschistus minutus and meiofauna accounts for a considerable part of their diet. Population dynam...
Article
The entire area has changed radically in just over 15yr, with a significant overall reduction in the number of species, and a significant overall increase in abundance and biomass. There are also significant differences between areas. Results must not only serve as a warning on a regional scale, but should also be considered a clear sign that the c...
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Aqua Fennica, 0356-7133, vol. 22, nr. 1, 71-80 The meiofauna community and meiofaunal colonization is described for and compared between two physically differing habitats in the northern Baltic Sea. Due to the low number of species/taxa in the Baltic Sea, it was expected that the meiofauna assemblage would not differ, in spite of different environm...
Article
A large-scale spatial (52 sampling stations in two areas; one previously affected by numerous sources of enrichment, and one pristine area used as a standard reference for coastal monitoring) and temporal (1972-1989) analysis of hydrography and benthic macrofauna in the archipelago waters of Åland, northern Baltic Sea, revealed significant changes...
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Sand goby Pomatoschistus minutus and the isopod Saduria entomon have little effect on meiofaunal colonization, whereas Saduria does affect colonization by the macrofauna. -from Authors
Article
Full-text available
Abstract for the 11th Baltic Marine Biologists Sympsoim, Szczecin, Poland, 11-16th September 1989 Baltic Marine Biologists Symposium. 11 Szczecin 1989 Publishing place: [s.l.]
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Memoranda societatis pro fauna et flora Fennica, ISSN 0373-6873 , vol. 68, 1 - 9 In recent years the need to record and quantify the natural amplitude and variability of biological parameters, such as the zoobenthos, has become increasingly important in coastal, shallow-water monitoring, as any changes observed are often attributed to the impact of...

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