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  1. Artikel ; Online: The Microcystis-microbiome interactions: origins of the colonial lifestyle.

    Piccini, Claudia / Martínez de la Escalera, Gabriela / Segura, Angel M / Croci, Carolina / Kruk, Carla

    FEMS microbiology ecology

    2024  Band 100, Heft 4

    Abstract: Species of the Microcystis genus are the most common bloom-forming toxic cyanobacteria worldwide. They belong to a clade of unicellular cyanobacteria whose ability to reach high biomasses during blooms is linked to the formation of colonies. Colonial ... ...

    Abstract Species of the Microcystis genus are the most common bloom-forming toxic cyanobacteria worldwide. They belong to a clade of unicellular cyanobacteria whose ability to reach high biomasses during blooms is linked to the formation of colonies. Colonial lifestyle provides several advantages under stressing conditions of light intensity, ultraviolet light, toxic substances and grazing. The progression from a single-celled organism to multicellularity in Microcystis has usually been interpreted as individual phenotypic responses of the cyanobacterial cells to the environment. Here, we synthesize current knowledge about Microcystis colonial lifestyle and its role in the organism ecology. We then briefly review the available information on Microcystis microbiome and propose that changes leading from single cells to colonies are the consequence of specific and tightly regulated signals between the cyanobacterium and its microbiome through a biofilm-like mechanism. The resulting colony is a multi-specific community of interdependent microorganisms.
    Mesh-Begriff(e) Microcystis/genetics ; Cyanobacteria ; Biomass ; Ecology ; Microbiota
    Sprache Englisch
    Erscheinungsdatum 2024-03-18
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 283722-5
    ISSN 1574-6941 ; 0168-6496
    ISSN (online) 1574-6941
    ISSN 0168-6496
    DOI 10.1093/femsec/fiae035
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Effect of hydrological modification on the potential toxicity of Microcystis aeruginosa complex in Salto Grande reservoir, Uruguay.

    Martínez de la Escalera, Gabriela / Kruk, Carla / Segura, Angel M / Piccini, Claudia

    Harmful algae

    2023  Band 123, Seite(n) 102403

    Abstract: It is widely known that the environmental conditions caused by the construction of reservoirs favor the proliferation of toxic cyanobacteria and the formation of blooms due to the high residence time of the water, low turbidity, temperature regimes, ... ...

    Abstract It is widely known that the environmental conditions caused by the construction of reservoirs favor the proliferation of toxic cyanobacteria and the formation of blooms due to the high residence time of the water, low turbidity, temperature regimes, among others. Microcystin-producing cyanobacteria such as those from the Microcystis aeruginosa complex (MAC) are the most frequently found organisms in reservoirs worldwide, being the role of the environment on microcystin production poorly understood. Here, we addressed the community dynamics and potential toxicity of MAC cyanobacteria in a subtropical reservoir (Salto Grande) located in the low Uruguay river. Samples were taken from five different sites (upstream, inside the reservoir and downstream) during contrasting seasons (summer and winter) to analyze: (i) the MAC community structure by amplicon sequencing of the phycocyanin gene spacer, (ii) the genotype diversity of microcystin-producing MAC by high resolution melting analysis of the mcyJ gene, and (iii) the abundance and mcy transcription activity of the microcystin-producing (toxic) fraction. We found that MAC diversity decreased from summer to winter but, despite the observed changes in MAC community structure, the abundance of toxic organisms and the transcription of mcy genes were always higher inside the reservoir, regardless of the season. Two different genotypes of toxic MAC were detected inside the reservoir, one associated with low water temperature (15 °C) and one thriving at high water temperature (31 °C). These findings indicate that the environmental conditions inside the reservoir reduce community diversity while promoting the proliferation of toxic genotypes that actively transcribe mcy genes, whose relative abundance will depend on the water temperature.
    Mesh-Begriff(e) Microcystis/genetics ; Microcystins/analysis ; Uruguay ; Cyanobacteria ; Water
    Chemische Substanzen Microcystins ; Water (059QF0KO0R)
    Sprache Englisch
    Erscheinungsdatum 2023-02-10
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2091119-1
    ISSN 1878-1470 ; 1568-9883
    ISSN (online) 1878-1470
    ISSN 1568-9883
    DOI 10.1016/j.hal.2023.102403
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: Lotka-Volterra model with Allee effect: equilibria, coexistence and size scaling of maximum and minimum abundance.

    Cammarota, Denise / Monteiro, Noemi Zeraick / Menezes, Rafael / Fort, Hugo / Segura, Angel M

    Journal of mathematical biology

    2023  Band 87, Heft 6, Seite(n) 82

    Abstract: The Lotka-Volterra competition model (LVCM) is a fundamental tool for ecology, widely used to represent complex communities. The Allee effect (AE) is a phenomenon in which there is a positive correlation between population density and fitness, at low ... ...

    Abstract The Lotka-Volterra competition model (LVCM) is a fundamental tool for ecology, widely used to represent complex communities. The Allee effect (AE) is a phenomenon in which there is a positive correlation between population density and fitness, at low population densities. However, the interplay between the LVCM and AE has been seldom analyzed in multispecies models. Here, we analyze the mathematical properties of the LVCM [Formula: see text] AE, investigating the coexistence of species interacting through neutral diffuse competition, their equilibria and stable points. Minimum viable population density arises as the threshold below which species go extinct, characteristic of strong Allee effects. Then, by imposing relationships of main parameters to body size, i.e. allometric scaling, we derive a general solution to the size-scaling maximum and minimum expected density under plausible scenarios. The scaling of maximum population density is consistent with the literature, but we also provide novel predictions on the scaling of the lower limit to population density, a critical value for conservation science. The resulting framework is general and yields results that increase our current understanding of how complex demographic processes can be linked to ubiquitous ecological patterns.
    Mesh-Begriff(e) Body Size ; Population Density
    Sprache Englisch
    Erscheinungsdatum 2023-11-06
    Erscheinungsland Germany
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 187101-8
    ISSN 1432-1416 ; 0303-6812
    ISSN (online) 1432-1416
    ISSN 0303-6812
    DOI 10.1007/s00285-023-02012-5
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel ; Online: Local protection bubbles

    Jose Paulo Guedes Pinto / Patrícia Camargo Magalhães / Gerusa Maria Figueiredo / Domingos Alves / Diana Maritza Segura Angel

    Cadernos de Saúde Pública, Vol 39, Iss

    an interpretation of the slowdown in the spread of coronavirus in the city of São Paulo, Brazil, in July 2020

    2023  Band 11

    Abstract: Abstract: After four months of fighting the pandemic, the city of São Paulo, Brazil, entered a phase of relaxed social distancing measures in July 2020. Simultaneously, there was a decline in the social distancing rate and a reduction in the number of ... ...

    Abstract Abstract: After four months of fighting the pandemic, the city of São Paulo, Brazil, entered a phase of relaxed social distancing measures in July 2020. Simultaneously, there was a decline in the social distancing rate and a reduction in the number of cases, fatalities, and hospital bed occupancy. To understand the pandemic dynamics in the city of São Paulo, we developed a multi-agent simulation model. Surprisingly, the counter-intuitive results of the model followed the city’s reality. We argue that this phenomenon could be attributed to local bubbles of protection that emerged in the absence of contagion networks. These bubbles reduced the transmission rate of the virus, causing short and temporary reductions in the epidemic curve - but manifested as an unstable equilibrium. Our hypothesis aligns with the virus spread dynamics observed thus far, without the need for ad hoc assumptions regarding the natural thresholds of collective immunity or the heterogeneity of the population’s transmission rate, which may lead to erroneous predictions. Our model was designed to be user-friendly and does not require any scientific or programming expertise to generate outcomes on virus transmission in a given location. Furthermore, as an input to start our simulation model, we developed the COVID-19 Protection Index as an alternative to the Human Development Index, which measures a given territory vulnerability to the coronavirus and includes characteristics of the health system and socioeconomic development, as well as the infrastructure of the city of São Paulo.
    Schlagwörter Social Distancing ; COVID-19 ; Virus Shedding ; Medicine ; R ; Public aspects of medicine ; RA1-1270
    Sprache Englisch
    Erscheinungsdatum 2023-12-01T00:00:00Z
    Verlag Escola Nacional de Saúde Pública, Fundação Oswaldo Cruz
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  5. Artikel ; Online: Rise of toxic cyanobacterial blooms is promoted by agricultural intensification in the basin of a large subtropical river of South America

    Kruk, Carla / Segura, Angel / Piñeiro, Gervasio / Baldassini, Pablo / Pérez‐Becoña, Laura / García‐Rodríguez, Felipe / Perera, Gonzalo / Piccini, Claudia

    Global Change Biology. 2023 Apr., v. 29, no. 7 p.1774-1790

    2023  

    Abstract: Toxic cyanobacterial blooms are globally increasing with negative effects on aquatic ecosystems, water use and human health. Blooms' main driving forces are eutrophication, dam construction, urban waste, replacement of natural vegetation with croplands ... ...

    Abstract Toxic cyanobacterial blooms are globally increasing with negative effects on aquatic ecosystems, water use and human health. Blooms' main driving forces are eutrophication, dam construction, urban waste, replacement of natural vegetation with croplands and climate change and variability. The relative effects of each driver have not still been properly addressed, particularly in large river basins. Here, we performed a historical analysis of cyanobacterial abundance in a large and important ecosystem of South America (Uruguay river, ca 1900 km long, 365,000 km² basin). We evaluated the interannual relationships between cyanobacterial abundance and land use change, river flow, urban sewage, temperature and precipitation from 1963 to the present. Our results indicated an exponential increase in cyanobacterial abundance during the last two decades, congruent with an increase in phosphorus concentration. A sharp shift in the cyanobacterial abundance rate of increase after the year 2000 was identified, resulting in abundance levels above public health alert since 2010. Path analyses showed a strong positive correlation between cyanobacteria and cropland area at the entire catchment level, while precipitation, temperature and water flow effects were negligible. Present results help to identify high nutrient input agricultural practices and nutrient enrichment as the main factors driving toxic bloom formation. These practices are already exerting severe effects on both aquatic ecosystems and human health and projections suggest these trends will be intensified in the future. To avoid further water degradation and health risk for future generations, a large‐scale (transboundary) change in agricultural management towards agroecological practices will be required.
    Schlagwörter agricultural management ; agroecology ; basins ; climate change ; cropland ; ecosystems ; eutrophication ; human health ; intensive farming ; land use change ; phosphorus ; public health ; risk ; river flow ; rivers ; sewage ; temperature ; toxicity ; vegetation ; watersheds ; South America ; Uruguay River
    Sprache Englisch
    Erscheinungsverlauf 2023-04
    Umfang p. 1774-1790.
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel ; Online
    Anmerkung JOURNAL ARTICLE
    ZDB-ID 1281439-8
    ISSN 1365-2486 ; 1354-1013
    ISSN (online) 1365-2486
    ISSN 1354-1013
    DOI 10.1111/gcb.16587
    Datenquelle NAL Katalog (AGRICOLA)

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  6. Artikel: Native pollinators increase fruit set while honeybees decrease the quality of mandarins in family farms

    Marcos, Monasterolo / Chacoff Natacha, P. / Segura Ángel, D. / Analía, Benavidez / Pablo, Schliserman

    Basic and applied ecology. 2022 July 25,

    2022  

    Abstract: Family farms can benefit from the presence of a diverse set of native pollinators and associated pollination services. In the present study we assessed the effect of flower visitor richness and visitation rate by honeybees and native insects on mandarin ... ...

    Abstract Family farms can benefit from the presence of a diverse set of native pollinators and associated pollination services. In the present study we assessed the effect of flower visitor richness and visitation rate by honeybees and native insects on mandarin production (Citrus reticulata `Criolla´), in ten citrus family farms located in the Dry Chaco region of northwest Argentina. An exclusion experiment was conducted to explore how pollinators influence the fruit set and quality of `Criolla´ mandarin. The influence of features such as local richness and abundance of flowering plants, farm size, and surrounding natural/semi-natural habitats in the diversity of flower visitors was also evaluated. Fruit set in open pollination branches was three times higher than in bagged branches, where flower visitors were excluded. Moreover, the mandarin fruit set increased with a higher native visitation rate, and mandarin quality (fruit weight and size) decreased with a higher honeybee visitation rate. Flower visitor diversity was higher in farmlands with a greater proportion of surrounding natural and semi-natural habitats. Our results demonstrate the negative effects of excessive honeybee visitation on citrus fruit quality and highlight the importance of native pollinators and natural habitat conservation to increase the fruit set and quality of mandarin in family farms.
    Schlagwörter Citrus reticulata ; applied ecology ; farm size ; flowers ; fruit quality ; fruit set ; fruit weight ; habitat conservation ; honey bees ; open pollination ; pollinators ; Argentina ; El Gran Chaco
    Sprache Englisch
    Erscheinungsverlauf 2022-0725
    Erscheinungsort Elsevier GmbH
    Dokumenttyp Artikel
    Anmerkung Pre-press version
    ZDB-ID 2026806-3
    ISSN 1439-1791
    ISSN 1439-1791
    DOI 10.1016/j.baae.2022.07.008
    Datenquelle NAL Katalog (AGRICOLA)

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  7. Artikel: Spatio-temporal dynamics of the fish community associated with artisanal fisheries activities within a key marine protected area of the Southwest Atlantic (Uruguay)

    Vögler, Rodolfo / González, Clara / Segura, Angel M

    Ocean & coastal management. 2020 June 01, v. 190

    2020  

    Abstract: Exploitation of fish species within marine protected areas (MPA) requires knowledge about fish and fleets dynamics in order to provide reasonable management actions. Our study analyzes a multi-specific artisanal fishery (<10 TGR) operating from La Paloma ...

    Abstract Exploitation of fish species within marine protected areas (MPA) requires knowledge about fish and fleets dynamics in order to provide reasonable management actions. Our study analyzes a multi-specific artisanal fishery (<10 TGR) operating from La Paloma port (Uruguay, South America) within the MPA of the Rocha Lagoon Protected Landscape (MPA-RLPL) through the temporal assessment (September 2005 to January 2010) of daily catch composition, fishing gear, and fish community dynamics. Seventeen vessels operated inside and outside the MPA-RLPL and they reached 202,773 kg of total catch within that MPA. This amount represents 9.1% of landings registered in La Paloma port during the study period (5 years). Following the seasonal dynamics of catch composition and fishing gears it was revealed a differential use of this coastal protected area by the artisanal fisheries and the fish community. Higher catches of Squatina guggenheim, Mustelus schmitti, Galeorhinus galeus, Urophycis brasiliensis, Paralichtys orbignyanus, and Cynoscion guatucupa occurred from spring-summer, whereas in fall-winter, the higher catches were composed of Micropogonias furnieri (adults and juveniles), Umbrina canosai, Pomatomus saltatrix, and Parona signata. A multiclass classification tree (CART) method confirmed the strong relationship between the catch composition, fishing gear, and time of fishing (month, season); this method successfully classified the dominant catches in 72% of the sets (error = 18%, n = 294). Squatina guggenheim (a threatened coastal shark), and Micropogonias furnieri (a overexploited bony fish) were the dominant catch in most fishing sets. At the present there are no specific measures to regulate fishery activities inside the MPA of the RLPL. Thus, our study results were used to propose an adaptive strategy to management small-scale fisheries within MPAs in balance with natural resources conservation. The key role of the MPA-RLPL in conservation ecology was revealed through a comparative analysis with larger areas distributed in the jurisdictional waters of Uruguay or under binational management with Argentina.
    Schlagwörter Cynoscion guatucupa ; Micropogonias furnieri ; Mustelus ; Parona signata ; Pomatomus saltatrix ; Squatina ; Umbrina ; Urophycis brasiliensis ; adults ; aquacultural and fisheries equipment ; artisanal fishing ; autumn ; catch composition ; coastal zone management ; fish communities ; juveniles ; landscapes ; marine protected areas ; sharks ; threatened species ; traditional technology ; Argentina ; Uruguay
    Sprache Englisch
    Erscheinungsverlauf 2020-0601
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ISSN 0964-5691
    DOI 10.1016/j.ocecoaman.2020.105175
    Datenquelle NAL Katalog (AGRICOLA)

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  8. Artikel ; Online: A multiagent coronavirus model with territorial vulnerability parameters

    Magalhaes, P. / Pinto, J. P. G. / Segura-Angel, D. M.

    Abstract: We developed a simple and user-friendly simulator called MD Corona that is based on a multiagent model and describes the transmission dynamics of coronavirus for a given location considering three setting parameters: population density, social-isolation ... ...

    Abstract We developed a simple and user-friendly simulator called MD Corona that is based on a multiagent model and describes the transmission dynamics of coronavirus for a given location considering three setting parameters: population density, social-isolation rate, and effective transmission probability. The latter is represented by the Corona Protection Index (CPI) - a measurement of a given territory's vulnerability to the coronavirus that includes characteristics of the health system and socio-economic development, as well as infrastructure. The dynamic model also relies on other real epidemiological parameters. The model is calibrated by using immunity surveys and provides accurate predictions and indications of the different dynamic mechanisms. Our simulation studies clearly demonstrate the existence of multiple epidemic curves in the same city due to different vulnerabilities to the virus across regions. And it elucidates the phenomenon of the epidemic slowing despite a reduction in social-distancing policies, understood as a consequence of ''local protection bubbles''. The simulator can be used for scientific outreach purposes, bringing science closer to the general public in order to raise awareness and increase engagement about the effectiveness of social distancing in reducing the transmissibility of the virus, but also to support effective actions to mitigate the spread of the virus.
    Schlagwörter covid19
    Verlag MedRxiv; WHO
    Dokumenttyp Artikel ; Online
    DOI 10.1101/2020.10.25.20218735
    Datenquelle COVID19

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  9. Artikel ; Online: A multiagent coronavirus model with territorial vulnerability parameters

    Magalhaes, Patricia / Pinto, Jose Paulo Guedes / Segura-Angel, Diana Maritza

    medRxiv

    Abstract: We developed a simple and user-friendly simulator called MD Corona that is based on a multiagent model and describes the transmission dynamics of coronavirus for a given location considering three setting parameters: population density, social-isolation ... ...

    Abstract We developed a simple and user-friendly simulator called MD Corona that is based on a multiagent model and describes the transmission dynamics of coronavirus for a given location considering three setting parameters: population density, social-isolation rate, and effective transmission probability. The latter is represented by the Corona Protection Index (CPI) - a measurement of a given territory′s vulnerability to the coronavirus that includes characteristics of the health system and socio-economic development, as well as infrastructure. The dynamic model also relies on other real epidemiological parameters. The model is calibrated by using immunity surveys and provides accurate predictions and indications of the different dynamic mechanisms. Our simulation studies clearly demonstrate the existence of multiple epidemic curves in the same city due to different vulnerabilities to the virus across regions. And it elucidates the phenomenon of the epidemic slowing despite a reduction in social-distancing policies, understood as a consequence of ″local protection bubbles″. The simulator can be used for scientific outreach purposes, bringing science closer to the general public in order to raise awareness and increase engagement about the effectiveness of social distancing in reducing the transmissibility of the virus, but also to support effective actions to mitigate the spread of the virus.
    Schlagwörter covid19
    Sprache Englisch
    Erscheinungsdatum 2020-10-28
    Verlag Cold Spring Harbor Laboratory Press
    Dokumenttyp Artikel ; Online
    DOI 10.1101/2020.10.25.20218735
    Datenquelle COVID19

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  10. Artikel ; Online: Rise of toxic cyanobacterial blooms is promoted by agricultural intensification in the basin of a large subtropical river of South America.

    Kruk, Carla / Segura, Angel / Piñeiro, Gervasio / Baldassini, Pablo / Pérez-Becoña, Laura / García-Rodríguez, Felipe / Perera, Gonzalo / Piccini, Claudia

    Global change biology

    2023  Band 29, Heft 7, Seite(n) 1774–1790

    Abstract: Toxic cyanobacterial blooms are globally increasing with negative effects on aquatic ecosystems, water use and human health. Blooms' main driving forces are eutrophication, dam construction, urban waste, replacement of natural vegetation with croplands ... ...

    Abstract Toxic cyanobacterial blooms are globally increasing with negative effects on aquatic ecosystems, water use and human health. Blooms' main driving forces are eutrophication, dam construction, urban waste, replacement of natural vegetation with croplands and climate change and variability. The relative effects of each driver have not still been properly addressed, particularly in large river basins. Here, we performed a historical analysis of cyanobacterial abundance in a large and important ecosystem of South America (Uruguay river, ca 1900 km long, 365,000 km
    Mesh-Begriff(e) Humans ; Rivers ; Ecosystem ; Cyanobacteria ; South America ; Eutrophication ; Water ; Lakes
    Chemische Substanzen Water (059QF0KO0R)
    Sprache Englisch
    Erscheinungsdatum 2023-02-05
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 1281439-8
    ISSN 1365-2486 ; 1354-1013
    ISSN (online) 1365-2486
    ISSN 1354-1013
    DOI 10.1111/gcb.16587
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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