Long-term records of hard-bottom communities in the southwestern Baltic Sea reveal the decline of a foundation species

Franz, Markus; Barboza, Francisco R.; Hinrichsen, Hans‐Harald; Lehmann, Andreas; Scotti, Marco; Hiebenthal, Claas; Molis, Markus; Schütt, Renate; Wahl, Martin

doi:10.1016/j.ecss.2019.02.029

Cited by 13 publications

(11 citation statements)

References 51 publications

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“…In the southern Baltic Sea (Kiel and Lübeck Bights), Mytilus settlement was investigated between 2005 and 2015. The settlement on panels made of experimental concrete slabs declined after 2009 in all locations in the two Bights and recovered only in the Lübeck Bight (Franz et al 2019).…”

Section: Baltic Seamentioning

confidence: 94%

“…(Poll)] has decreased by a factor of three from 1985 to 2013 correlating to a halving of Chl-a annual mean concentration from about 6 mg•m −3 to 3 mg•m −3 as a result of reduced eutrophication (Riemann et al 2016). A Chl-a concentration of 3-6 mg•m −3 was found to be optimal for Mytilus filtration by Franz et al (2019).…”

Section: Access To Food For Musselsmentioning

confidence: 98%

See 1 more Smart Citation

Declining Populations of Mytilus spp. in North Atlantic Coastal Waters—A Swedish Perspective

Baden¹,

Hernroth²,

Lindahl³

2021

Journal of Shellfish Research

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Section: Baltic Seamentioning

confidence: 94%

Section: Access To Food For Musselsmentioning

confidence: 98%

Declining Populations of Mytilus spp. in North Atlantic Coastal Waters—A Swedish Perspective

Baden¹,

Hernroth²,

Lindahl³

2021

Journal of Shellfish Research

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“…Predicted increase in temperature and decrease in surface salinity of the Baltic Sea (Räisänen 2017 and references therein) are hence expected to affect organisms, food webs and ecosystems (Andersson et al 2015a;Vuorinen et al 2015). Recent studies have shown a decrease in mussel populations over recent decades in the southern Baltic Proper, linked to a changing environment (Franz et al 2019;Westerbom et al 2019;Liénart et al 2020). A shift in dominance from the canopy-forming perennial macrophyte Fucus towards opportunistic ephemeral Cladophora has been reported since the 1980s in different areas of the Baltic Sea (Kraufvelin and Salovius 2004), likely linked to eutrophication (Kautsky et al 1986;Råberg 2004;Torn et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Variation in Stable Isotope and Elemental Composition of Key-Species Reflect Environmental changes in the Baltic Sea

Liénart

Garbaras

Qvarfordt

et al. 2021

Preprint

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Carbon and nitrogen stable isotope ratios are increasingly used to study long-term change in food web structure and nutrient cycling. Whether isotope composition in primary producers and consumers (so-called isotope baselines) reflect environmental changes in a similar manner is largely unknown. We take advantage of long-term oceanographic monitoring data and archived biological samples for the well-studied Baltic Sea to retrospectively analyse elemental composition (C, N and P) and stable isotopes (δ13C, δ15N) in the filamentous ephemeral macroalgae Cladophora spp. and in blue mussel Mytilus edulis trossulus from three contrasting regions (coastal Bothnian Sea and Baltic proper, open sea central Baltic) with the aim to statistically link the observed spatial and interannual (8–24 years’ time-series) variability in elemental and isotope baselines with environmental changes. We find clear differences in isotope baselines between the two major Baltic Sea basins. However, the temporal development in Mytilus δ13C was remarkably similar among regions and, at the open sea station, mussels and algae δ13C also correlated over time, likely reflecting a global Baltic Sea or Northern Hemisphere pattern. In contrast, δ15N of both taxa responded to regional and local drivers (water nutrient concentrations). δ15N in source amino acids allowed detection of diazotrophic N signal in Mytilus, which was masked in bulk δ15N. Finally, Cladophora N:P reflected regional nutrient levels in the water while P %, which differed for both taxa, was linked to food quality for Mytilus. This study highlights the potential of a multi-taxa and multi-stable isotope approach to understand nutrient dynamics and monitor long-term environmental changes.

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“…Predicted increase in temperature and decrease in surface salinity of the Baltic Sea (Ra ¨isa ¨nen 2017 and references therein) are hence expected to affect organisms, food webs and ecosystems (Andersson et al 2015a;Vuorinen et al 2015). Recent studies have shown a decrease in mussel populations over recent decades in the southern Baltic Proper, linked to increasing water temperature and changes in food quantity (Franz et al 2019;Westerbom et al 2019) and quality (Lie ´nart et al 2020). A shift in dominance from the canopy-forming perennial macrophyte Fucus towards opportunistic ephemeral Cladophora has been reported since the 1980 s in different areas of the Baltic Sea (Kraufvelin and Salovius 2004), likely linked to eutrophication (Kautsky et al 1986;Ra ˚berg 2004;Torn et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal variation in stable isotope and elemental composition of key-species reflect environmental changes in the Baltic Sea

et al. 2021

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Carbon and nitrogen stable isotope ratios are increasingly used to study long-term change in food web structure and nutrient cycling. We retrospectively analyse elemental composition (C, N and P) and stable isotopes (δ13C, δ15N) in archived monitoring samples of two important taxa from the bottom of the food web; the filamentous ephemeral macroalgae Cladophora spp. and the blue mussel Mytilus edulis trossulus from three contrasting regions in the Baltic Sea (coastal Bothnian Sea and Baltic Proper, open sea central Baltic). The aim is to statistically link the observed spatial and interannual (8–24 years’ time-series) variability in elemental and isotope baselines with their biomass trends and to the oceanographic monitoring data reflecting the ongoing environmental changes (i.e., eutrophication and climate) in this system. We find clear differences in isotope baselines between the two major Baltic Sea basins. However, the temporal variation in Mytilus δ13C was similar among regions and, at the open sea station, mussels and algae δ13C also correlated over time, likely reflecting a global (Suess) effect, whereas δ15N of both taxa varied with local and regional dissolved nitrogen concentrations in water. δ15N in source amino acids allowed detection of diazotrophic N in Mytilus, which was masked in bulk δ15N. Finally, Cladophora N:P reflected regional nutrient levels in the water while P%, which differed for both taxa, was linked to food quality for Mytilus. This study highlights the potential of a multi-taxa and multi-stable isotope approach to understand nutrient dynamics and monitor long-term environmental changes.

show abstract

Long-term records of hard-bottom communities in the southwestern Baltic Sea reveal the decline of a foundation species

Cited by 13 publications

References 51 publications

Declining Populations of Mytilus spp. in North Atlantic Coastal Waters—A Swedish Perspective

Declining Populations of Mytilus spp. in North Atlantic Coastal Waters—A Swedish Perspective

Spatio-Temporal Variation in Stable Isotope and Elemental Composition of Key-Species Reflect Environmental changes in the Baltic Sea

Spatio-temporal variation in stable isotope and elemental composition of key-species reflect environmental changes in the Baltic Sea

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