Assessing nature and dynamics of POM in transitional environment (the Curonian Lagoon, SE Baltic Sea) using a stable isotope approach

Remeikaitė-Nikienė, Nijolė; Lujaniené, G.; Malejevas, Vitalijus; Barisevičiūtė, Rūta; Žilius, Mindaugas; Vybernaitė-Lubienė, Irma; Garnaga-Budrė, G.; Stankevičius, Algirdas

doi:10.1016/j.ecolind.2017.06.035

Cited by 20 publications

(5 citation statements)

References 39 publications

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“…Indeed, a field study showed a relatively small POC:Chl ratio (160~170 g:g) in the western subarctic region 38 . Overall, the observed POC:Chl ratios are close to the value (~200 g:g) representing the predominance of local biological activities in POC production 39,40 , indicating that biological processes are largely responsible for the higher levels of surface POC observed in the subarctic region.…”

Section: Discussionsupporting

confidence: 64%

Impacts of Physical and Biological Processes on Spatial and Temporal Variability of Particulate Organic Carbon in the North Pacific Ocean during 2003–2017

Wang

Fan

2019

Sci Rep

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The North Pacific Ocean is a significant carbon sink region, but little is known about the dynamics of particulate organic carbon (POC) and the influences of physical and biological processes in this region at the basin scale. Here, we analysed high-resolution surface POC data derived from MODIS-Aqua during 2003–2017, together with satellite-derived sea surface chlorophyll and temperature (SST). There are large spatial and temporal variations in surface POC in the North Pacific. Surface POC is much lower in the subtropical region (<50 mg m−3) than in the subarctic region (>100 mg m−3), primarily resulting from the south-to-north variability in biological production. Our analyses show significant seasonal and interannual variability in surface POC. In particular, there is one peak in winter-spring in the western subtropical region and two peaks in late spring and fall in the western subarctic region. Surface POC is positively correlated with chlorophyll (r = ~1) and negatively correlated with SST (r = ~−0.45, P < 0.001) south of 45°N, indicating the strong influence of physically driven biological activity on the temporal variability of POC in the subtropical region. There is a significantly positive but relatively lower correlation coefficient (0.6–0.8) between POC and chlorophyll and an overall non-significantly positive correlation between POC and SST north of 45°N, reflecting the reduction in the POC standing stock due to the fast sinking of large particles. The climate modes of the Pacific Decadal Oscillation, El Niño–Southern Oscillation and North Pacific Gyre Oscillation have large impacts on POC in various seasons in the subtropical region and weak influences in the subarctic region. Surface POC was anomalously high after 2013 (increased by ~15%) across the basin, which might be the result of complex interactions of physical and biological processes associated with an anomalous warming event (the Blob).

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Section: Discussionsupporting

confidence: 64%

Impacts of Physical and Biological Processes on Spatial and Temporal Variability of Particulate Organic Carbon in the North Pacific Ocean during 2003–2017

Wang

Fan

2019

Sci Rep

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“…We also found a significant (p < 0.01) negative correlation between C/N and PN and a positive correlation between C/N and δ 15 N (Table 2; Figure 3), indicating the disturbance from anthropogenic nitrogen inputs to the middle and lower basin of the Iyidere River and changes the composition of POM. Similar δ 15 N values (>8‰) were also reported for the eutrophication of rivers with high nutrient and municipal wastewater loads that enter the Baltic Sea (Lesutienė et al, 2014;Remeikaitė-Nikienė et al, 2017;Amir et al, 2019).…”

Section: Spring Seasonsupporting

confidence: 82%

Distribution and sources of particulate organic matter from the anthropogenically disturbed Iyidere River to the Black Sea coast

Kaymak

Mutlu

Verep

2023

Front. Environ. Sci.

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Understanding the biogeochemical processes of particulate organic matter occurring in the river under anthropogenic disturbances and its transport to the coastal system is important for environmental resource management. In this study, we investigated the sources and distribution of particulate organic matter (POM) from the upper reaches of the Iyidere River, Türkiye, to the coastal water of the Black Sea during the fall and spring seasons using the elemental (POC and PON (%), C/N), isotopic (δ13C and δ15N), and Bayesian mixing model (MixSIAR) analysis. The POC (%), PON (%), and C/N of POM varied seasonally, indicating that the composition of POM varied with river hydrology, which varies depending on the climate of the region. Both the mixing model and the isotopic and elemental ratios of POM have revealed that the organic matter sources contributing to the riverine of POM, during the fall season, when the precipitation is severe, exhibited a uniform distribution. Heavy rain increased soil erosion along the high-slope land, and as a result, soil and bacteria were identified as the main contributor of POM along the Iyidere River. The results showed that the organic matter sources contributing to POM in the spring season showed significant spatial variation. Terrestrial vegetation, soil OM, and bacteria were the main contributors of POM depending on sites, and these contributions did not show a regular trend along the river. δ15N of POM had significant spatial variation in both seasons that was likely caused by nitrogen inputs derived from anthropogenic activities along the river. The anthropogenic activities and cascade dams causing variations in the contribution of organic matter to the POM are the likely important driving factors in this river-coastal system.

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“…The high d 15 N range on the Odra Bank could be due to either, the benthic invertebrate community covering two trophic levels, if considering a trophic fractionation factor of ~3‰ (Post, 2002), or, and most likely, high variability in d 15 N values of basal sources. d 15 N values of basal sources in the coastal Baltic Sea are highly spatially and seasonally variable due to a combination of factors including availability of inorganic nitrogen, riverine versus marine influence and seasonal phytoplankton succession (Maksymowska et al, 2000;Lesutienėet al, 2014;Remeikaite-Nikienėet al, 2017). Studies in the Curonian lagoon showed that the d 15 N values of particulate organic matter (POM) potentially range within one year from -0.9 ‰ to 15.5 ‰ (Remeikaite-Nikienėet al, 2017).…”

Section: Isotopic Variability In Prey Speciesmentioning

confidence: 99%

Trophic redundancy in benthic fish food webs increases with scarcity of prey items, in the Southern Baltic Sea

et al. 2023

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Bottom trawling is one of the main pressures on benthic ecosystems, directly impacting the targeted species and physically disturbing the seabed and the benthic invertebrate communities, in turn indirectly impacting benthivorous fish and the entire benthic food web structure and functioning. To predict the cascading effect of bottom trawling on benthic and demersal fish communities, it is crucial to understand the trophic interactions between benthic and demersal fish and benthic invertebrates. Here, we assessed the diet of benthic and demersal fish and the structure and functioning of the benthic food web in two areas in the German Baltic Sea, the Fehmarnbelt and the Odra Bank. The Fehmarnbelt benthic invertebrate community is characterized by a high number of species and biomass, contrary to the one on the Odra Bank which is species poor with high individual abundance but low biomass. We used mixing models based on stable isotopes of carbon and nitrogen combined with stomach content analyses to estimate the fish diet at both sites, and we used community-wide trophic indices, derived from stable isotopes to compare the structure and functioning of the fish benthic food webs. We show that fish in the Fehmarnbelt can chose preferential prey items, resulting in higher trophic diversity, contrary to fish on the Odra Bank, which feed on all available prey species, resulting in higher trophic redundancy. We found that the generalist behavior of fish on the Odra Bank is likely the result of scarcity in prey items, the benthic invertebrate community being species poor with high abundance of small individuals. We demonstrate that the differences in structure and functioning of the benthic fish food web between the two sites was mainly driven by differences in the characteristics of the benthic prey communities.

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Assessing nature and dynamics of POM in transitional environment (the Curonian Lagoon, SE Baltic Sea) using a stable isotope approach

Cited by 20 publications

References 39 publications

Impacts of Physical and Biological Processes on Spatial and Temporal Variability of Particulate Organic Carbon in the North Pacific Ocean during 2003–2017

Impacts of Physical and Biological Processes on Spatial and Temporal Variability of Particulate Organic Carbon in the North Pacific Ocean during 2003–2017

Distribution and sources of particulate organic matter from the anthropogenically disturbed Iyidere River to the Black Sea coast

Trophic redundancy in benthic fish food webs increases with scarcity of prey items, in the Southern Baltic Sea

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