Integrity of benthic assemblages along the arctic estuarine-coastal system

Udalov, A. A.; Chikina, M. V.; Azovsky, Andrey I.; Basin, A. B.; Galkin, Sergey; Garlitska, Lesya; Khusid, T. A.; Kondar, D. V.; Korsun, Sergei; Kremenetskiy, Viacheslav; Makkaveev, P. N.; Portnova, Daria; Sapojnikov, Philipp; Simakov, M. I.; Vedenin, Andrey; Mokievsky, Vadim

doi:10.1016/j.ecolind.2020.107115

Cited by 13 publications

(10 citation statements)

References 97 publications

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“…In general, the intensity of a boundary or transition zone tends to increase with the spatial overlap of multiple environmental gradients (Azovsky et al 1998). Some further studies con rm that shifts in the composition and structure of estuarine assemblages correspond more closely to an ecocline than to an ecotone model (Chaves et al 2018), while in other cases, a combination of both types was observed, i.e., an ecocline containing one or a series of ecotones (Modéran et al 2010;Udalov et al 2021). Although the ecoclinal characteristics seemed to be a general feature of estuarine biocenoses, the ecotone could be more system-speci c and biological compartment-speci c. In particular, the patterns in estuarine macrobenthic communities were related mainly to two independent drivers: salinity and sediment type (Teske and Wooldridge 2003; Udalov et al 2004;2021;Chertoprud et al, 2013).…”

Section: Introductionmentioning

confidence: 93%

“…Most zonation and classi cation schemes proposed to date for transitional waters focus mainly on the hydrological regime and the mean salinity as generally the more obvious environmental factors. These schemes are, however, not applicable consistently to any type of estuarine system and do not always correspond to the observed distribution of biota along estuarine gradients (Taupp, Wetzel 2014; Udalov et al 2021). Biologically relevant schemes taking into account the zonation of biotic communities are under development (Elliot and Whit eld 2011; Tweedley et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Functional Structure of Intertidal Ciliate Assemblages Along Salinity Gradient in Two Contrasting Estuaries Testing Paradigms in Estuarine Ecology

Azovsky,

SARAVANAKUMAR,

GARLITSKA

et al. 2023

Preprint

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The abundance, diversity, taxonomic composition and functional structure of benthic ciliate assemblages were studied in the intertidal zone of two estuaries with contrasting conditions. The Chernaya (CH) is a small (2-km long) sub-Arctic estuary in the White Sea; the Vellar (VE) is a large (20-km long) tropical estuary in the Bay of Bengal. At both sites, the average abundance and biomass of ciliates were similar and quite typical of other marine interstitial habitats. The diversity was high (114 species in CH; 39 taxa, mainly identified to the genus or putative species level, in VE). Spatial distribution patterns in abundance, biomass and taxonomy-based diversity indices differed between the estuaries. In contrast, most functional traits followed similar trends in both estuaries. In particular, from the riverine part seaward, the ratio of raptorial algivorous ciliates to bacterio- and detritovore fine filter feeders increased, as well as the ratio of crawling or gliding ciliates to free-swimmers. Mean body size and oblongness also increased seaward. No clearly defined diversity minima were found in the mid-estuary oligohaline zones. The results are discussed in the context of some general concepts in estuarine ecology.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Functional Structure of Intertidal Ciliate Assemblages Along Salinity Gradient in Two Contrasting Estuaries Testing Paradigms in Estuarine Ecology

Azovsky,

SARAVANAKUMAR,

GARLITSKA

et al. 2023

Preprint

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“…There is a substantial body of scientific debate around the nature of ecological boundaries in estuarine ecosystems (reviewed in Attrill and Rundle 2002), but an ecocline model (i.e. a continuum of assemblages along the gradient of an environmental factor) has been described for many estuaries including the Yenisei Estuary and the Gulf of Ob in the adjacent Kara Sea (Vedenin et al 2015;Udalov et al 2021), the Thames Estuary (Attrill and Rundle 2002), the Forth Estuary (McLusky et al 1993) and other aquatic ecosystems characterised by gradient of environmental conditions-e.g. the Spitsbergen Fjords (Włodarska-Kowalczuk et al 2012).…”

Section: Macrozoobenthos Of the Pechora Baymentioning

confidence: 99%

Macrozoobenthos of the Pechora Bay in 2020–2021 indicates a likely change of common bivalve molluscs in the Arctic estuary

et al. 2023

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The Pechora Bay is a hydrologically and ecologically important area of the Barents Sea but there are still gaps in our knowledge of biodiversity of the area, including macrozoobenthos. In the first half of the twentieth century, the Pechora Bay was noted as a type locality for the bivalve mollusc Portlandia aestuariorum. Only a few surveys of macrozoobenthos have been conducted since and the last work from this area indicated the absence of P. aestuariorum. In this paper, we described macrozoobenthos and hydrological conditions of the bay based on the data collected in field campaigns in 2020–2021. All estuarine stations corresponded to a monodominant community of Macoma balthica poor in biomass (27.29 ± 20.82 g m−2) and species richness (33 species of macrozoobenthos recorded from 10 stations). The seaward most station was occupied by a marine assemblage of macrozoobenthos dominated by polychaetes Nephtys longosetosa and Cistenides hyperborea. Macrozoobenthos of the bay forms an ecocline from estuarine to marine species along the gradient of salinity. No significant differences in macrobenthic abundance, biomass and species richness were found between the 2 years of sampling and described fauna corresponds well to communities sampled in 1990s. Portlandia aestuariorum was absent in all our samples, which supports the hypothesis of disappearance of this previously common bivalve mollusc from the area, but the question of the driver of the change in macrozoobenthos remains open and requires further investigation.

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“…Marine Benthos is the primary and important component of marine sedimentary biodiversities, which are often employed as markers of environmental change. Depending on their size, benthos includes three classes; microfauna, meiofauna, and macrofauna ( Bhadury et al, 2020 , Udalov et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Exploring the taxonomic and functional diversity of marine benthic micro-Eukaryotes along the Red Sea coast of Jeddah city

Baeshen

Alkaladi

Alhejen

et al. 2022

Saudi Journal of Biological Sciences

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Integrity of benthic assemblages along the arctic estuarine-coastal system

Cited by 13 publications

References 97 publications

Functional Structure of Intertidal Ciliate Assemblages Along Salinity Gradient in Two Contrasting Estuaries Testing Paradigms in Estuarine Ecology

Functional Structure of Intertidal Ciliate Assemblages Along Salinity Gradient in Two Contrasting Estuaries Testing Paradigms in Estuarine Ecology

Macrozoobenthos of the Pechora Bay in 2020–2021 indicates a likely change of common bivalve molluscs in the Arctic estuary

Exploring the taxonomic and functional diversity of marine benthic micro-Eukaryotes along the Red Sea coast of Jeddah city

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