Environmental Statistical Analysis on the Impacts of Marine Mucilage on some Seawater Quality Parameters

Oral, Hasan Volkan

doi:10.30897/ijegeo.1187859

Cited by 3 publications

(4 citation statements)

References 25 publications

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“…Eutrophication, the increase in nutrient levels, was reported to encourage growth of harmful species, change trophic networks, and alter the diversity and richness of the ecosystem 25 . Elevated levels of phosphate and nitrogen in marine environments are known to play a significant role in promoting marine mucilage events 26 . Marine mucilage can carry distinct bacterial communities 5 which can play a role in these events by producing EPS and further contributing to mucilage formation.…”

Section: Discussionmentioning

confidence: 99%

Increased Nutrient Levels Enhance the Bacterial Contribution to an Algal-Bacterial Extracellular Matrix

Lipsman,

Segev

2024

Preprint

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Microbial aggregation is central in environmental processes, such as marine snow and harmful marine mucilage events. Nutrient enrichment positively correlates with microbial aggregation. This correlation is largely attributed to the overgrowth of microalgae and the overproduction of agglomerating exopolysaccharides (EPS). However, recent studies highlight the significant contribution of bacterial EPS to algal-bacterial aggregation. Here, using controlled laboratory experiments and environmental metatranscriptomic analysis, we investigate the impact of nutrient enrichment on bacterial EPS production, while bacteria are in the context of their algal hosts. Our findings demonstrate a marked increase in bacterial EPS production in response to an increase of inorganic phosphorus and nitrogen levels, both in the lab and in the environment. These results highlight the interplay between nutrient regimes, bacterial physiology, and microbial aggregation in marine ecosystems and emphasize gaps in our understanding regarding the bacterial role in environmental processes that involve microbial aggregation.

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Section: Discussionmentioning

confidence: 99%

Increased Nutrient Levels Enhance the Bacterial Contribution to an Algal-Bacterial Extracellular Matrix

Lipsman,

Segev

2024

Preprint

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“…Müsilaj olgusu ile ilgili literatürde birçok bilimsel çalışma bulunmaktadır. Çalışmalar genel olarak müsilaja neden olan kimyasal mekanizmalar (Iciglenecki vd., 2021;Liénart vd, 2016;Danovaro, Fonda ve Pusceddu, 2009;Oral, 2023;Tepić, Gašparović ve Ahel, 2009;Jannelli, Fazio ve Ambrosi, 2003), müsilajı oluşturan organizmaların çeşitleri (Fuksi vd., 2018;Mrokowska ve Krztoń-Maziopa, 2024;Sartoni vd., 2008;Giani vd., 2003) müsilajın görüldüğü bölgelerdeki topografik özellikler, müsilajın deniz akıntıları ile ilişkisi, iklim değişimine bağlı deniz tuz seviyesi ve deniz suyu sıcaklık değişimlerinin müsilaja etkileri (Danovaro, Fonda ve Pusceddu, 2009;Deserti vd., 2005;Kömüşçü vd., 2022) gibi konular üzerine yoğunlaşmaktadır. Müsilajın deniz ekosistemine etkileri (Daban vd., 2023;Karlson vd., 2021) ve bertaraf edilme yöntemleri de diğer çalışma konuları arasındadır.…”

Section: Marmara Deni̇zi̇'ndeki̇ Müsi̇laj Sorunuunclassified

Marmara Deni̇zi̇'nde Görülen Müsi̇lajin Ortadan Kaldirilmasina Yöneli̇k Poli̇ti̇kalarin Si̇stem Di̇nami̇ği̇ İle İncelenmesi̇

Demirel,

Sezer

2024

Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi

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Jeopolitik, ekonomik ve ekolojik açıdan önemli bir yeri olan Marmara Denizi’nde yaşanan kirlilikteki artış son yıllarda farklı çevrelerin dikkatini çekmekle birlikte özellikle 2020-2021 yıllarında yaşanan müsilaj problemi sorunun ciddiyetini ortaya koymuştur. Literatürde iklim değişikliği, topografik yapı, artan nüfus, sanayileşme, tarım aktiviteleri, atıksu arıtma sistemlerinde kullanılan teknolojinin yetersizliği, vb. etmenlerin müsilaj oluşumunu tetiklediği öne sürülmektedir. Müsilaj sorununun çözümüne yönelik çeşitli stratejiler öne sunulmakla birlikte bu stratejilerin ne gibi sonuçlar doğuracağına ilişkin sayısal bir çalışma bulunmamaktadır. Bu amaçla bu makalede Marmara Denizi’nde görülen müsilaj olgusunu modellemek ve sorunu çözmeye yönelik politikaların etkilerini incelemek üzere sistem dinamiği yaklaşımına dayalı bir benzetim modeli sunulmaktadır. Önerilen model müsilaja neden olan temel mekanizmalar ile müsilajın ekonomik etkilerini temsil etmekte olup müsilaj problemini ortadan kaldırmaya yönelik çeşitli stratejilerin etkinlik seviyelerini farklı senaryolarla ortaya koymaktadır. Elde edilen bulgulara göre ileri biyolojik arıtma seviyelerinin arttırılması, tarım ve hayvancılık aktiviteleri için alınacak önlemler ve bölge nüfus artışına karşı alınacak önlemlerin bir arada uygulanmasının Marmara Denizindeki müsilaj riskini sınırlandıracağı sonucuna varılmaktadır.

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“…Marine snow plays a central role in surface-to-bottom fluxes, acting as a shuttle of nutrients from the photic zone to the bottom of the ocean 2 . In the Mediterranean seas, high nutrient influxes 3 , sea surface warming 4 and water column stratification during summer 5 are factors that can promote the merging of these algal aggregates into massive gelatinous layers, known as marine mucilage 5 . The mucilage poses several environmental threats, such as preventing oxygen diffusion to lower parts of the water column and carrying pathogenic bacteria 3,4 .…”

mentioning

confidence: 99%

“…In the Mediterranean seas, high nutrient influxes 3 , sea surface warming 4 and water column stratification during summer 5 are factors that can promote the merging of these algal aggregates into massive gelatinous layers, known as marine mucilage 5 . The mucilage poses several environmental threats, such as preventing oxygen diffusion to lower parts of the water column and carrying pathogenic bacteria 3,4 . However, the factors contributing to aggregation, including marine mucilage formation and the microorganisms involved, remain areas of limited understanding.…”

mentioning

confidence: 99%

Bacteria contribute exopolysaccharides to an algal-bacterial joint extracellular matrix

Lipsman,

Shlakhter,

Rocha

et al. 2024

npj Biofilms Microbiomes

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Marine ecosystems are influenced by phytoplankton aggregation, which affects processes like marine snow formation and harmful events such as marine mucilage outbreaks. Phytoplankton secrete exopolymers, creating an extracellular matrix (ECM) that promotes particle aggregation. This ECM attracts heterotrophic bacteria, providing a nutrient-rich and protective environment. In terrestrial environments, bacterial colonization near primary producers relies on attachment and the formation of multidimensional structures like biofilms. Bacteria were observed attaching and aggregating within algal-derived exopolymers, but it is unclear if bacteria produce an ECM that contributes to this colonization. This study, using Emiliania huxleyi algae and Phaeobacter inhibens bacteria in an environmentally relevant model system, reveals a shared algal-bacterial ECM scaffold that promotes algal-bacterial aggregation. Algal exudates play a pivotal role in promoting bacterial colonization, stimulating bacterial exopolysaccharide (EPS) production, and facilitating a joint ECM formation. A bacterial biosynthetic pathway responsible for producing a specific EPS contributing to bacterial ECM formation is identified. Genes from this pathway show increased expression in algal-rich environments. These findings highlight the underestimated role of bacteria in aggregate-mediated processes in marine environments, offering insights into algal-bacterial interactions and ECM formation, with implications for understanding and managing natural and perturbed aggregation events.

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Environmental Statistical Analysis on the Impacts of Marine Mucilage on some Seawater Quality Parameters

Cited by 3 publications

References 25 publications

Increased Nutrient Levels Enhance the Bacterial Contribution to an Algal-Bacterial Extracellular Matrix

Increased Nutrient Levels Enhance the Bacterial Contribution to an Algal-Bacterial Extracellular Matrix

Marmara Deni̇zi̇'nde Görülen Müsi̇lajin Ortadan Kaldirilmasina Yöneli̇k Poli̇ti̇kalarin Si̇stem Di̇nami̇ği̇ İle İncelenmesi̇

Bacteria contribute exopolysaccharides to an algal-bacterial joint extracellular matrix

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