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  • 1. Enge, Swantje
    et al.
    Sagerman, Josefin
    Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.
    Wikström, Sofia A.
    Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.
    Pavia, Henrik
    A Review of Herbivore Effects on Seaweed Invasions2017In: Oceanography and Marine Biology: An Annual Review, Volume 55 / [ed] S. J. Hawkins, A. J. Evans, A.C. Dale, L. B. Firth, D. J. Hughes, I. P. Smith, BOCA RATON: CRC PRESS-TAYLOR & FRANCIS GROUP , 2017, Vol. 55, p. 421-440Chapter in book (Refereed)
    Abstract [en]

    Almost 300 non-native seaweeds are identified worldwide and an increasing number of these are classified as invasive with potential negative effects on the diversity and functioning of native ecosystems. Marine herbivores affect seaweed biomass and community structure in marine habitats across the globe. Consequently, herbivore-seaweed interactions are expected to be important for the establishment and invasion success of non-native seaweeds. To synthesize current knowledge of consumer effects on non-native seaweeds, we performed a meta-analysis on feeding preferences of native herbivores for non-native versus native seaweeds. Data were included from 35 studies, published from 1992-2015 and comprising 18 non-native seaweeds. Results showed that overall, native herbivores tended to prefer to feed on native rather than non-native seaweeds. Preferences were, however, variable across studies with significant differences between taxonomic and functional groups of seaweeds. In particular, filamentous red non-native seaweeds were of low palatability to native herbivores. No general feeding preferences were apparent between natives and non-natives for brown and green seaweeds, or for leathery and corticated seaweeds. In addition, we reviewed the existing studies on the effects of consumers on the performance of native and non-native seaweeds in invaded communities. This indicated that non-native seaweeds performed better than their native competitors in the presence of grazers, but in many cases had superior competitive abilities also in the absence of herbivory. To achieve a comprehensive evaluation of consumers' role in seaweed invasion success, future research should have a larger focus on manipulative community experiments, ideally on time scales that include seasonal changes and complete life cycles of the seaweeds.

  • 2.
    Forslund, Helena
    et al.
    Stockholm University, Faculty of Science, Department of Botany.
    Wikström, Sofia A.
    Stockholm University, Faculty of Science, Department of Systems Ecology.
    Pavia, Henrik
    Higher resistance to herbivory in introduced compared to native populations of a seaweed2010In: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 164, no 3, p. 833-840Article in journal (Refereed)
    Abstract [en]

    Non-indigenous species (NIS) are important components of global change, and in order to manage such species it is important to understand which factors affect their success. Interactions with enemies in the new range have been shown to be important for the outcome of introductions, but thus far most studies on NIS-enemy interactions have considered only specialist herbivores in terrestrial systems. Here we present the results from the first biogeographic study that compares herbivore resistance between populations in the native and new region of a non-indigenous seaweed. We show that low consumption of the non-indigenous seaweed by a generalist herbivore is caused by higher chemical defence levels and herbivore resistance in the new range-and not by the failure of the herbivore to recognise the non-indigenous seaweed as a suitable host. Since most seaweed-herbivore interactions are dominated by generalist herbivores, this pattern could be common in marine communities. Our results also reveal that traits used to predict the invasive potential of species, such as their resistance to enemies, can change during the invasion process, but not always in the way predicted by dominant theories.

  • 3.
    Hansen, Joakim
    et al.
    Stockholm University, Faculty of Science, Department of Botany.
    Wikström, Sofia
    Kautsky, Lena
    Stockholm University, Faculty of Science, Department of Botany.
    Effects of water exchange and vegetation on the macroinvertebrate fauna composition of shallow land-uplift bays in the Baltic Sea2008In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 77, no 3, p. 535-547Article in journal (Refereed)
    Abstract [en]

    Shallow bays with soft sediment bottoms are common habitats along the Swedish and Finnish Baltic Sea coastline. These bays undergo a process of geomorphometric evolution with the natural isostatic land-uplift process, whereby open bays and sounds decrease in depth and are gradually isolated from the sea, forming bays with narrow openings. This study tested the relationship between the morphometric isolation of the bays from the sea and the macroinvertebrate fauna community of these bays. Additionally, we tested the specific role of the submerged vegetation as an indicator of the macroinvertebrate fauna community. We chose two environmental factors for the analyses, water exchange of the bays and the taxon richness of the macroflora in the bays. We found a hierarchical relationship between water exchange, flora taxon richness, and fauna biomass and taxon richness using structural equation modelling: decreased biomass and taxon richness of fauna were related to decreased flora taxon richness, which in turn was related to decreased water exchange. Using multivariate redundancy analysis, the two environmental factors included in the model were found to explain 47.7% of the variation in the fauna taxon composition and 57.5% of the variation in the functional feeding groups of the fauna. Along the morphometric isolation gradient of the bays, the fauna assemblages changed from a community dominated by gastropods, bivalves, and crustaceans, to a community mainly consisting of a few insect taxa. Moreover, the proportion of predators, gathering collectors, and shredders increased while that of filtering collectors and scrapers decreased. Our results indicate that the density and taxon richness of macroinvertebrate fauna are higher in less morphometrically isolated bays than in more isolated bays in the Baltic Sea. Furthermore, we suggest that the taxon richness of macroflora can serve as an indicator of the fauna community.

  • 4.
    Sagerman, Josefin
    et al.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Enge, Swantje
    Pavia, Henrik
    Wikström, Sofia
    Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre. Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Low feeding preference of native herbivores for the successful non-native seaweed Heterosiphonia japonicaManuscript (preprint) (Other academic)
  • 5.
    Sagerman, Josefin
    et al.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Enge, Swantje
    Pavia, Henrik
    Wikström, Sofia A.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. AquaBiota Water Research, Sweden.
    Divergent ecological strategies determine different impacts on community production by two successful non-native seaweeds2014In: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 175, no 3, p. 937-946Article in journal (Refereed)
    Abstract [en]

    The consequences of plant introductions into ecosystems are frequently reported from terrestrial environments, but little is known about the effects on ecosystem functioning caused by non-native primary producers in marine systems. In this study we explored the effects of the invasion by the two filamentous red algae Heterosiphonia japonica and Bonnemaisonia hamifera on the primary production of seaweed communities by using single and mixed cultures of non-native and native red algae. The experiments were conducted both in the presence and absence of herbivores. Biomass production of the invaded community increased more than four times in mixed cultures with H. japonica, while introduction by B. hamifera had no significant effect. The different impact on community production could be explained by differences in life history strategies between the invaders; H. japonica grew considerably faster than the native seaweeds which directly increased the community production, while B. hamifera showed a relatively slow growth rate and therefore had no effect. From previous studies it is known that B. hamifera produces a highly deterrent, but also costly, chemical defence. The assessment of survival and growth of a native generalist herbivore further corroborated that the biomass produced by B. hamifera constitutes a very low-quality food, whereas the performance of herbivores on a diet of H. japonica was comparable to that on native algal diets. In summary, this study demonstrates that successful invaders belonging to the same functional group (filamentous red algae) may have distinctly different impacts on productivity in the recipient community, depending on their specific life history traits.

  • 6.
    Sagerman, Josefin
    et al.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Enge, Swantje
    Pavia, Henrik
    Wikström, Sofia A.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.
    Low feeding preference of native herbivores for the successful non-native seaweed Heterosiphonia japonica2015In: Marine Biology, ISSN 0025-3162, E-ISSN 1432-1793, Vol. 162, no 12, p. 2471-2479Article in journal (Refereed)
    Abstract [en]

    Non-native seaweeds constitute a conspicuous component of many benthic coastal communities. Seaweed invaders are known to significantly affect invaded communities, but relatively little is known about the mechanisms underlying their success. In this study, we explored the feeding preferences of three generalist herbivores for the successful non-native red alga Heterosiphonia japonica and native seaweed competitors. The experiments were conducted on the Swedish Skagerrak coast (58A degrees 52'N, 11A degrees 08'E) from July to August. Additionally, chemical and physical traits of the seaweeds were assessed to mechanistically explain herbivore preferences. The results showed that H. japonica was of low preference to native herbivores and that this was most likely explained by chemical properties of the invader. We were, however, not able to determine whether the low preference was caused by deterrent metabolites or low nutritional quality. We conclude that herbivore avoidance may be important for the survival and success of H. japonica in the introduced range and that efficient means of escaping herbivory may be a common feature of invaders in seaweed communities.

  • 7.
    Sagerman, Josefin
    et al.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Pavia, Henrik
    Wikström, Sofia
    Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre. Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Competition between the non-native Fucus evanescens and the native congener Fucus vesiculosusManuscript (preprint) (Other academic)
  • 8.
    Sagerman, Josefin
    et al.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Staberg, Nichlas
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Pavia, Henrik
    Wikström, Sofia
    Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre. Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Decomposition rates differ between two seaweed invaders with different ecophysiological traitsManuscript (preprint) (Other academic)
  • 9.
    Staveley, Thomas
    et al.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Hernvall, Patrick
    Stjärnkvist, Nellie
    van der Meijs, Felix
    Wikström, Sofia
    Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.
    Gullström, Martin
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Exploring seagrass fish assemblages in relation to the habitat patch mosaic in the brackish Baltic SeaManuscript (preprint) (Other academic)
  • 10.
    Tano, Stina A.
    et al.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Eggertsen, Maria
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Wikström, Sofia A.
    Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.
    Berkström, Charlotte
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Buriyo, A. S.
    Halling, Christina
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Tropical seaweed beds as important habitats for juvenile fish2017In: Marine and Freshwater Research, ISSN 1323-1650, E-ISSN 1448-6059, Vol. 68, no 10, p. 1921-1934Article in journal (Refereed)
    Abstract [en]

    Seaweed beds within tropical seascapes have received little attention as potential fish habitat, despite other vegetated habitats, such as seagrass meadows and mangroves, commonly being recognised as important nurseries for numerous fish species. In addition, studies of vegetated habitats rarely investigate fish assemblages across different macrophyte communities. Therefore, the aim of the present study was to investigate the role of tropical seaweed beds as fish habitat, particularly for juvenile fish, by comparing their fish assemblages with those of closely situated seagrass beds. Fish assemblages were assessed by visual census in belt transects, where fish were identified and their length estimated, and habitat variables were estimated for each transect. The abundance of juvenile fish in seaweed beds was twice as high as that in seagrass meadows, whereas there was no difference in total, subadult or adult fish abundance. In addition, the abundance of commercially important and coral reef-associated juveniles was higher in seaweed beds, as was fish species richness. Fish assemblages differed between habitats, with siganids being more common in seagrass meadows and juvenile Labridae and Serranidae more common in seaweed beds. These results highlight that tropical seaweed beds are important juvenile fish habitats and underscore the need to widen the view of the shallow tropical seascape.

  • 11.
    Tano, Stina A.
    et al.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Halling, Christina
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Lind, Emma
    Buriyo, Amelia
    Wikström, Sofia A.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Extensive spread of farmed seaweeds causes a shift from native to non-native haplotypes in natural seaweed beds2015In: Marine Biology, ISSN 0025-3162, E-ISSN 1432-1793, Vol. 162, no 10, p. 1983-1992Article in journal (Refereed)
    Abstract [en]

    Seaweed farming has been the cause of introductions of non-indigenous seaweed species and genotypes throughout the world. In Zanzibar, Tanzania, foreign genotypes of Eucheuma denticulatum were introduced for farming purposes in 1989, and in recent years a spread of non-indigenous haplotypes has been reported. The current study aimed to investigate the presence and extent of introduced and native haplotypes of E. denticulatum as well as their relative frequencies, to obtain the severity of the spread of cultivated seaweed and the current state of the native populations. The results show that all investigated sites are dominated by the introduced South-east Asian haplotypes, even where seaweed farming has never occurred. As the frequencies of East African haplotypes are remarkably low, this shows a shift from native to introduced E. denticulatum. This shift may, at least in part, be caused by earlier overharvest of natural seaweed populations, and indicates a cryptic invasion of the introduced haplotypes at the potential cost of the recovery of the native haplotype populations.

  • 12.
    Tano, Stina
    et al.
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Eggertsen, Maria
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Wikström, Sofia A.
    Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.
    Berkström, Charlotte
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Buriyo, A. S.
    Hailing, Christina
    Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
    Tropical seaweed beds are important habitats for mobile invertebrate epifauna2016In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 183, p. 1-12Article in journal (Refereed)
    Abstract [en]

    Marine macrophyte habitats in temperate regions provide productive habitats for numerous organisms, with their abundant and diverse invertebrate epifaunal assemblages constituting important linkages between benthic primary production and higher trophic levels. While it is commonly also recognized that certain vegetated habitats in the tropics, such as seagrass meadows, can harbour diverse epifaunal assemblages and may constitute important feeding grounds to fish, little is known about the epifaunal assemblages associated with tropical seaweed beds. We investigated the abundance, biomass and taxon richness of the mobile epifaunal community (>= 1 mm) of tropical East African seaweed beds, as well as the abundance of invertivorous fishes, and compared it with that of closely situated seagrass meadows, to establish the ecological role of seaweed beds as habitat for epifauna as well as potential feeding grounds for fish. The results showed that seaweed beds had a higher abundance of mobile epifauna (mean SD: 10,600 +/- 6000 vs 3700 +/- 2800 per m(2)) than seagrass meadows, as well as a higher invertebrate biomass (35.9 +/- 46.8 vs 1.9 +/- 2.1 g per m(2)) and taxon richness (32.7 +/- 11.8 vs 19.1 +/- 6.3 taxa per sample), despite having a lower macrophyte biomass. Additionally, the high abundance of invertivorous fishes found in seaweed beds indicates that they act as important feeding grounds to several fish species in the region.

  • 13.
    Wikstrom, Sofia A.
    et al.
    Stockholm University, Faculty of Science, Department of Systems Ecology.
    Hillebrand, Helmut
    Invasion by mobile aquatic consumers enhances secondary production and increases top-down control of lower trophic levels2012In: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 168, no 1, p. 175-186Article in journal (Refereed)
    Abstract [en]

    Increased biological diversity due to invasion by non-indigenous species (NIS) is a global phenomenon with potential effects on trophic interactions and ecosystem processes in the invaded habitat. We assessed the effects of resource availability and invasion of three non-indigenous invertebrate grazers (two crustaceans and a snail) on secondary production, relative dominance of NIS grazers and resource depletion in experimental freshwater mesocosms. The relative dominance of NIS grazers increased with increasing initial resource availability, although the effect was largest for one of the three species. The effect was due to the fact that all the included non-indigenous grazers were able to expand their populations quickly in response to resource addition. For the most dominating species, the increased grazer diversity due to invasion in turn resulted in higher production of grazer biomass and a more efficient depletion of the periphyton resource. The effect was largest at high initial resource availability, where NIS dominance was most pronounced. Our results show that an invasion-induced increase in species diversity can increase resource depletion and consequently production, but that the effect depends on identity of the introduced species. The results also suggest that properties of the recipient system, such as resource availability, can modulate ecosystem effects of NIS by affecting invader success and dominance.

  • 14.
    Wikström, Sofia A.
    et al.
    Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.
    Carstensen, Jacob
    Blomqvist, Mats
    Krause-Jensen, Dorte
    Cover of coastal vegetation as an indicator of eutrophication along environmental gradients2016In: Marine Biology, ISSN 0025-3162, E-ISSN 1432-1793, Vol. 163, no 12, article id 257Article in journal (Refereed)
    Abstract [en]

    Coastal vegetation communities are important for primary production, biodiversity, coastal protection, carbon and nutrient cycling which, in combination with their sensitivity to eutrophication, render them potential indicators of environmental status for environmental policies like the EU Water and Marine Strategy Framework Directives. We evaluated one potential indicator for coastal vegetation, the cumulative cover at depths where the vegetation is light limited, by investigating its response to eutrophication along gradients in natural conditions. We used a large data set covering the Swedish coastline, spanning broad gradients in nutrient level, water clarity, sea-bed substrate, physical exposure and climate in addition to a salinity gradient from 0.5 to 30.5. Macroalgal cover increased significantly along gradients of declining nutrient concentration and increasing water clarity when we had accounted for diver effects, spatio-temporal sampling variability, salinity gradients, wave exposure and latitude. The developed empirical model explained 79% of the variation in algal cover across 130 areas. Based on this, we identified macroalgal cover as a promising indicator across the Baltic Sea, Kattegat and Skagerrak. A parallel analysis of soft-substrate macrophytes similarly identified significant increases in cover with decreasing concentrations of total nitrogen and increasing salinity, but the resulting empirical model explained only 52% of the variation in cover, probably due to the spatially more variable nature of soft-substrate vegetation. The identified general responses of vegetation cover to gradients of eutrophication across wide ranges in environmental settings may be useful for monitoring and management of marine vegetation in areas with strong environmental gradients.

  • 15.
    Wikström, Sofia
    et al.
    Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre.
    Blomqvist, Mats
    Svedäng, Henrik
    Effekter av bottentrålning på ekosystemtjänster i svenska hav2018Report (Other academic)
    Abstract [sv]

    Bottentrålsfiske ger omfattande effekter på marina ekosystem och ekosystemprocesser. I rapporten redovisar vi det kunskapsunderlag som finns vad gäller effekterna av trålning på havets ekosystem och de ekosystemtjänster vi får från havet. Vårt syfte med studien har därför varit att ta fram underlag för att bedöma behovet av ytterligare begränsningar av bottentrålning i inflyttningsområdena innanför trålgränsen och i eller i anslutning till skyddade områden utanför trålgränsen. Vi baserar vårt arbete på publicerade vetenskapliga studier från både Sverige och andra delar av världen. När det gäller den specifika situationen i svenska havsområden hämtas mycket av kunskapen från områden som idag är skyddade från bottentrålning, bland annat från Öresund som är ett stort trålfredningsområde mellan Sverige och Danmark, där större delen av havsområdet har varit skyddat mot aktiva fiskeredskap sedan 1932. Bottentrålningen i svenska hav är framförallt koncentrerad till Västerhavet och södra Östersjön men lokalt finns begränsade områden med bottentrålning även i övriga delar av svenska hav. 

    Effekterna av bottentrålning är dels kopplade till påverkan av havsbottnarna, dels till att bottentrålar är starkt selektiva på så sätt att all fisk över en viss storlek fångas, medan mindre fisk har möjlighet att simma igenom nätmaskorna. Dessa effekter kan innebära att många ekosystemtjänster missgynnas. Exempel på ekosystemtjänster som kan påverkas negativt är biologisk mångfald, livsmiljöer på bottnarna, näringsvävar, produktion av livsmedel och rekreation. Studier från svenska hav visar att den pågående bottentrålningen minskar biologisk mångfald och mångfalden av livsmiljöer i trålade områden. 

    Trålningsbegränsningar i skyddade områden kan därför få positiva effekter på ekosystemtjänsterna biologisk mångfald och livsmiljöer. För övriga ekosystemtjänster saknas den kunskap som skulle behövas för att bedöma hur mycket de påverkas av nuvarande trålning i skyddade områden och innanför trålgränsen. Det finns därför ett behov av ytterligare forskning för att kvantifiera effekten av bottentrålning på många av ekosystemtjänsterna. Speciellt behövs mera systematisk forskning och kunskapssynteser kring utnyttjandet av svenska kustområden för att åstadkomma mer heltäckande utvärderingar av de kulturella ekosystemtjänsterna och hur de påverkas av exempelvis bottentrålning.

    Effekter av tidigare högt fisketryck är mycket tydligt längs hela svenska västkusten norr om Öresund, där lokala rovfiskbestånd, företrädesvis torsk, har försvunnit eller har gått starkt tillbaka, vilket påverkar flera ekosystemtjänster. Det är dock okänt i hur hög grad risttrålfiske efter havskräfta och räka innanför trålgränsen påverkar dessa lokala fiskbestånd idag.

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