Long-term changes in primary production and mineralization of organic matter in the Neva Estuary (Baltic Sea)

Голубков, С. М.; Golubkov, Mikhail; Tiunov, Alexei V.; Nikulina, V. N.

doi:10.1016/j.jmarsys.2016.12.009

Cited by 30 publications

(19 citation statements)

References 20 publications

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“…At present, heavy nutrient and organic matter loading, mainly from the Neva River and St. Petersburg City (the largest megalopolis in the Baltic Region with > 5 million citizens), are the most significant environmental problem for the Neva Estuary. Eutrophication, organic pollution and biological invasions are the most serious threats to the environment of the Neva Estuary (Telesh et al 2008;Golubkov et al 2017Golubkov et al , 2018Golubkov et al , 2020b. NIS have a significant impact on the Estuary environment, many of which have become the dominant species in macroinvertebrate and fish communities over the past two decades (Orlova et al 2004;Golubkov and Litvinchuk 2015;Maximov 2015;Demchuk et al 2021).…”

Section: Study Site and Samplingmentioning

confidence: 99%

“…The explosive development of non-indigenous worms Marenzelleria occurred in the eastern part of the Gulf of Finland in 2009 after a series of hypoxicanoxic events that led to the decline of native zoobenthos communities, which were dominated by the amphipod M. affinis and the isopod S. entomon, over a large area of the Gulf (Maximov 2015). Currently, M. arctia dominates the zoobenthos of the easternmost Gulf of Finland (Maximov 2015;Golubkov et al 2017Golubkov et al , 2019.…”

Section: Introductionmentioning

confidence: 99%

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Food-web modification in the eastern Gulf of Finland after invasion of Marenzelleria arctia (Spionidae, Polychaeta)

Голубков¹,

Tiunov²,

Golubkov³

2021

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The paucity of data on non-indigenous marine species is a particular challenge for understanding the ecology of invasions and prioritising conservation and research efforts in marine ecosystems. Marenzelleria spp. are amongst the most successful non-native benthic species in the Baltic Sea during recent decades. We used stable isotope analysis (SIA) to test the hypothesis that the dominance of polychaete worm Marenzelleria arctia in the zoobenthos of the Neva Estuary after its invasion in the late 2000s is related to the position of this species in the benthic food webs. The trend towards a gradual decrease in the biomass of Marenzelleria worms was observed during 2014–2020, probably due to significant negative relationships between the biomass of oligochaetes and polychaetes, both of which, according to SIA, primarily use allochthonous organic carbon for their production. The biomass of benthic crustaceans practically did not change and remained very low. The SIA showed that, in contrast to the native crustacean Monoporeia affinis, polychates are practically not consumed either by the main invertebrate predator Saduria entomon, which preys on M. affinis, oligochaetes and larvae of chironomids or by benthivorous fish that prefer native benthic crustaceans. A hypothetical model for the position and functional role of M. arctia in the bottom food web is presented and discussed. According the model, the invasion of M. arctia has created an offshoot food chain in the Estuary food webs. The former dominant food webs, associated with native crustaceans, are now poorly developed. The lack of top-down control obviously contributes to the significant development of the Marenzelleria food chain, which, unlike native food chains, does not provide energy transfer from autochthonous and allochthonous organic matter to the upper trophic levels. The study showed that an alien species, without displacing native species, can significantly change the structure of food webs, creating blind offshoots of the food chain.

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Section: Study Site and Samplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Food-web modification in the eastern Gulf of Finland after invasion of Marenzelleria arctia (Spionidae, Polychaeta)

Голубков¹,

Tiunov²,

Golubkov³

2021

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“…The primary production of plankton (PP) and the mineralization of organic matter (D) in the water column were measured by the oxygen method of light and dark bottles (Hall et al, 2007;Vernet and Smith, 2007). A more detailed description of the method and experimental design was given previously (Golubkov et al, 2017).…”

Section: Sample Analysismentioning

confidence: 99%

“…Starting from the middle part of the estuary, the water column in the summer period is stratified. In addition, there is a gradient of plankton primary production rate from the mouth of the Neva River toward the Gulf of Finland and from the coast to the open part of the estuary (Golubkov et al, 2017;. These gradients together with climate change lead to highly variable environments , which may contribute to the extinction of native species and invasions of eurybiont species invaders (Holopainen et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effects of Environmental Gradients on the Biomass of Alien Cercopagis pengoi in the Neva Estuary

2020

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Biological invasions are a global trend due to globalization of the world. An important goal of invasion biology is to identify environmental characteristics that may make a region receptive to invasions. We tested the hypothesis that environmental variables have stronger effect on the biomass of the alien Cercopagis pengoi in the Neva Estuary than biotic interactions with other zooplankton species. Hierarchical cluster, principal component and Pearson correlation analyzes were used to elucidate changes within the zooplankton community along environmental gradients. The data analysis showed that the biomass of C. pengoi was higher in waters with higher salinity, low temperature, high transparency, lower chlorophyll a concentration and lower proportion of chlorophyll in particulate suspended matter. The biomass of C. pengoi showed significant positive correlations with biomasses of its potential preys. However, we did not find direct significant negative correlations between C. pengoi and larger zooplankton predators Leptodora kindtii and Bythotrephes spp. This research generally supports the hypothesis that if environmental variables are appropriate for an exotic species, then that species is likely to invade successfully, regardless of the native species already present.

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“…Содержание минеральной взвеси (ВМВ) рассчитывали как разницу между ВВ и ВОВ. Данные по первичной продукции и де струкции, хлорофиллу а, гидрохимические ха рактеристики Невской губы за большую часть периода исследований детально представлены в работе (Голубков [Golubkov] 2009;Golubkov et al 2017).…”

Section: материал и методыunclassified

Influence of the environmental factors on species diversity and quantitative development of zoobenthos in the Neva Bay

Balushkina

Golubkov

2018

Proceedings ZIN

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Hydrochemical characteristics, primary production of plankton, taxonomic composition, species richness, species diversity and quantitative characteristics of the benthic fauna of the Neva Bay had been collected and analyzed at the end of July and the very beginning of August 2003–2012 by the method stepwise regression, calculated equations with a free constant. Effects of biotic and abiotic factors on the structural and functional characteristics of benthic communities in the Neva Bay were evaluated using multiregression analysis. Research period had been accompanied by revival of industry of Saint-Petersburg, construction of ports, active navigation, development of Sea facade and completion of the construction of the St. Petersburg Flood Prevention Facility Complex and a large-scale hydrotechnical works: building of a Marine Multifunctional Reloading Complex (MMRC) “Bronka” and approach fairway to it. Results of statistical analysis showed that the number of species and species diversity of bottom animals in the Neva Bay declined with increased primary production and chlorophyll a concentration. Analysis of the factors influencing the values of biomass of benthic animal communities shows that these characteristics increased with growing chlorophyll concentration. During the anthropogenic stress of 2006–2007, the existing links between the structural characteristics of the zoobenthos and the functional biotic characteristics of the Neva Bay were completely destroyed. Restoration period 2008–2012 was accompanied by an increase in the species richness and species diversity of zoobenthos to the level observed before anthropogenic stress.

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Long-term changes in primary production and mineralization of organic matter in the Neva Estuary (Baltic Sea)

Cited by 30 publications

References 20 publications

Food-web modification in the eastern Gulf of Finland after invasion of Marenzelleria arctia (Spionidae, Polychaeta)

Food-web modification in the eastern Gulf of Finland after invasion of Marenzelleria arctia (Spionidae, Polychaeta)

Effects of Environmental Gradients on the Biomass of Alien Cercopagis pengoi in the Neva Estuary

Influence of the environmental factors on species diversity and quantitative development of zoobenthos in the Neva Bay

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