Distinct patterns of sedimentary phosphorus fractionation and mobilization in the seafloor of the Black Sea, Marmara Sea and Mediterranean Sea

Akçay, İsmail; Yücel, Mustafa

doi:10.1016/j.scitotenv.2022.160936

Cited by 3 publications

(2 citation statements)

References 62 publications

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“…The complexity of marine ecosystems makes it challenging to definitively link mucilage events to changes in species abundance. A leading theory suggests that deoxygenation in deeper waters in the SoM (Akçay & Yücel, 2023) forces the aggregation of elasmobranchs in oxygen‐rich coastal areas (Sims, 2019), driving the apparent biomass increase. The observed biomass surge might be more linked to habitat alterations due to deoxygenation rather than mucilage effects.…”

Section: Discussionmentioning

confidence: 99%

Distribution and diversity of elasmobranchs in the Sea of Marmara: A 2023 status report

Karadurmuş,

Sarı

2024

Aquatic Conservation

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Elasmobranchs, encompassing an array of sharks and rays, confront a threat of extinction on a global scale. The Sea of Marmara (SoM) stands out as a critical refuge for these endangered species. This study harnesses data derived from comprehensive trawl surveys, representing the first area‐based evaluation of the elasmobranchs inhabiting the SoM. Sampling protocols were carried out at 10 separate stations along the 980‐km coastline of the SoM, each bounded by different ecological characteristics and anthropogenic influences. A total of eight shark species and six ray species were caught in the towed area of the entire the SoM. Notably, Scyliorhinus canicula and near‐threatened Raja clavata constitute more than 50% of the total abundance. Additionally, rare, and critically endangered species, including the Oxynotus centrina, Squatina squatina, Dipturus batis, and Myliobatis aquila, were documented, expanding our knowledge of their presence in the region. Spatial distribution heterogeneity was pronounced within species. Size distributions were species‐specific, and the presence of both juvenile and adult individuals suggested successful reproduction and growth. Records expand the known size range in the SoM for six shark and three ray species. It also provides first‐size information based on the total length of the S. stellaris and D. batis. Additionally, the urgent need for field‐based conservation efforts is highlighted, citing a previously unidentified important sensitive areas located in the southern part of the SoM.

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Section: Discussionmentioning

confidence: 99%

Distribution and diversity of elasmobranchs in the Sea of Marmara: A 2023 status report

Karadurmuş,

Sarı

2024

Aquatic Conservation

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“…There is currently a lack of data on the sources and distribution of POM along the river under an anthropogenic disturbance from land to sea in Northeast Anatolia. Previous studies have mostly focused on the nutrient concentrations, quality, and stoichiometry of sediment and POM from the coastal zone (Akbal et al, 2011;Bayram et al, 2011) and open water of the Black Sea (Coban-Yıldız et al, 2000;Çoban-Yıldız, 2006;Ergül and Topcuoğlu, 2009;Akçay and Yücel, 2023).…”

Section: Introductionmentioning

confidence: 99%

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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Characterization of Phosphate Compounds along a Catena from Arable and Wetland Soil to Sediments in a Baltic Sea lagoon

et al. 2023

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Phosphorus (P) is an indispensable nutrient for arable crops, but at the same time, contributes to excessive eutrophication in aquatic ecosystems. Knowledge about P is essential to assess the possible risks of P being transported towards vulnerable aquatic ecosystems. Our objective was to characterize P along a catena from arable and wetland soils towards aquatic sediments of a shallow lagoon of the Baltic Sea. The characterization of P in soil and sediment samples included a modified sequential P fractionation and P K-edge X-ray absorption near edge structure (XANES) spectroscopy. The concentrations of total P ranged between 390 and 430 mg kg−1 in the arable soils, between 728 and 2258 mg kg−1 in wetland soils and between 132 and 602 mg kg−1 in lagoon sediments. Generally, two sinks for P were revealed along the catena. The wetland soil trapped moderately stable P, Al-P and molybdate-unreactive P (MUP), which are most likely organically bound phosphates. Sediments at the deepest position of the catena acted as a sink for, MUP compounds among the lagoon sediments. Thus, wetlands formed by reed belts can help to prevent the direct transfer of P from arable soils to adjacent waters and deeper basins and help to avoid excessive eutrophication in shallow aquatic ecosystems.

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Distinct patterns of sedimentary phosphorus fractionation and mobilization in the seafloor of the Black Sea, Marmara Sea and Mediterranean Sea

Cited by 3 publications

References 62 publications

Distribution and diversity of elasmobranchs in the Sea of Marmara: A 2023 status report

Distribution and diversity of elasmobranchs in the Sea of Marmara: A 2023 status report

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

Characterization of Phosphate Compounds along a Catena from Arable and Wetland Soil to Sediments in a Baltic Sea lagoon

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