Figura 5 - uploaded by Clara Natalia Rodríguez-Flórez
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Diagrama de Olmstead-Tukey de la densidad (individuos/mL) de cada especie o género registrada en cada lago urbano: a) Centenario, b) Regatas, c) Rosedal, de septiembre de 2014 a abril de 2015. Figure 5. Olmstead-Tukey diagram of the density (individuals/mL) of each species and/or gender registered in each urban lake: a) Centenario, b) Regatas, c) Rosedal, from September 2014 to April 2015.
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Los lagos urbanos son ecosistemas que tienden a una rápida eutrofización y que pueden desarrollar floraciones fitoplanctónicas en el período estival. En tres lagos urbanos de la Ciudad Autónoma de Buenos Aires (Regatas, Rosedal y Centenario), sometidos a diferentes estrategias de manejo, durante el período cálido septiembre 2014 - abril 2015 se est...
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RESUMEN. Los lagos urbanos son ecosistemas que tienden a una rápida eutrofización y que pueden desarrollar floraciones fitoplanctónicas en el período estival. En tres lagos urbanos de la Ciudad Autónoma de Buenos Aires (Regatas, Rosedal y Centenario), sometidos a diferentes estrategias de manejo, durante el período cálido septiembre 2014-abril 2015...
La marisma del arroyo Jabalí forma parte de la Reserva Natural Provincial de Uso Múltiple Bahía San Blas y se encuentra ubicada al sudeste de la provincia de Buenos Aires, Argentina. El objetivo del trabajo es analizar los principales procesos geohidrológicos que regulan la química del agua superficial y subterránea de este humedal y su relación co...
El objetivo general del trabajo es caracterizar la distribución espacial de las concentraciones de nitratos, sulfatos, fluoruros y arsénico total en las aguas del acuífero Pampeano de la ciudad de Pergamino, el único medio de aprovisionamiento de agua de la ciudad. Los datos fueron obtenidos por Obras Sanitarias de Pergamino y corresponden al prome...
Citations
... Furthermore, their uneven distribution causes a yet stronger anthropic pressure on some public green areas. Buenos Aires green spaces host a total of 14 eutrophic to hypertrophic shallow lakes and ponds (Rodríguez-Flórez et al. 2019). This calls for assessing the risk of their undergoing potentially harmful algal blooms. ...
... Urban water bodies previously studied in Buenos Aires have been classified as eu-to hypertrophic (Ehrenhaus &Vigna, 2006, Rodríguez-Flórez et al. 2019, Allende et al. 2019. ...
By the end of the exceptionally warm and stormy autumn of 2018, a fish kill occurred in a small hypertrophic pond located in a recreative green area in Buenos Aires (BA, Argentina). As there were no visible signs of an algal bloom, the causes for the die-off were investigated. On 1st June, the pond was sampled while fish, mostly Bryconamericus iheringii (Characidae) and Australoheros facetus (Cichlidae) were still dying. Despite low turbidity (18.9 NTU) and chlorophyll a concentration values (15.90 µg/L) as compared to similar BA waterbodies, a heavy bloom of planktonic araphid diatoms (161,600 ind/mL) was detected, mainly caused by Fragilaria saxoplanctonica (Fragilariaceae), Pseudostaurosira neoelliptica (Fragilariaceae) and Ulnaria cf. acus (Fragilariaceae). Previous records of high abundances of these or closely related planktonic diatoms around the world were associated with increased temperature and nutrient content, yet they did not cause other than nuisance blooms. Fish necropsy showed good body condition except for gill damage and mucus accumulation due to a large amount of frustules of these species, mainly P. neoelliptica, interspersed in the gill filaments. Although this is a common cause for die-offs in marine fish farms, it is unprecedented in freshwater systems, and particularly in urban waterbodies. Conversely to more common –and foreseeable- summer cyanobacterial blooms in these systems, this phenomenon was triggered by an autumnal weather anomaly. This fact is crucial, as non-summer heat waves and heavy storms are predicted to increase in frequency and intensity over the subtropical regions, yet their ecological consequences are less perceived, seldom studied, and far from understood. This could be the first documented case of many to occur in such heavily eutrophicated environments unless effective strategies for eutrophication control and management are taken.
... Furthermore, their uneven distribution causes a yet stronger anthropic pressure on some public green areas. Buenos Aires green spaces host a total of 14 eutrophic to hypertrophic shallow lakes and ponds (Rodríguez-Flórez et al. 2019). This calls for assessing the risk of their undergoing potentially harmful algal blooms. ...
By the end of the exceptionally warm and stormy autumn of 2018, a fish kill occurred in a small hypertrophic pond located in a recreative green area in Buenos Aires (BA, Argentina). As there were no visible signs of an algal bloom, the causes for the die-off were investigated. On 1st June, the pond was sampled while fish, mostly Bryconamericus iheringii (Characidae) and Australoheros facetus (Cichlidae) were still dying. Despite low turbidity (18.9 NTU) and chlorophyll a concentration values (15.90 µg/L) as compared to similar BA waterbodies, a heavy bloom of planktonic araphid diatoms (161,600 ind/mL) was detected, mainly caused by Fragilaria saxoplanctonica (Fragilariaceae), Pseudostaurosira neoelliptica (Fragilariaceae) and Ulnaria cf. acus (Fragilariaceae). Previous records of high abundances of these or closely related planktonic diatoms around the world were associated with increased temperature and nutrient content, yet they did not cause other than nuisance blooms. Fish necropsy showed good body
condition except for gill damage and mucus accumulation due to a large amount of frustules of these species, mainly P. neoelliptica, interspersed in the gill filaments. Although this is a common cause for die-offs in marine fish farms, it is unprecedented in freshwater systems, and particularly in urban waterbodies. Conversely to more common –and foreseeable- summer cyanobacterial blooms in these systems, this phenomenon was triggered by an autumnal weather anomaly. This fact is crucial, as non-summer heat waves and heavy storms are predicted to increase in frequency and intensity over the subtropical regions, yet their ecological consequences are less perceived, seldom studied, and far from understood. This could be the first documented case of many to occur in such heavily eutrophicated environments unless effective strategies for eutrophication control and management are taken.
“Phytoplankton” is a loosely defined functional term, indicating a group of organisms distributed into several taxonomic groups ranging from oxygenic photosynthetic bacteria to a number of eukaryotic classes included in protists. The range of specializations and adaptations of phytoplankton to a wide variety of environmental conditions is astounding. This demonstrates the susceptibility of highly different populations to react rapidly to environmental changes generated by natural stressors and anthropogenic impacts. The aim of this work is to critically review the state of the art of knowledge about the impact of anthropogenic stress factors on phytoplankton composition and structure. At present, the two most important environmental stressors are represented by climate change and eutrophication, which act globally and at regional/local scales, respectively. Along with effects mediated by many other legacy and emerging stressors (briefly reviewed), the effects of these two main changes have been analysed at different levels of phytoplankton organization, i.e. individuals, populations and communities. It is stressed that a better knowledge will be obtained by extending the focus of studies from organisms detectable by light microscopy to the whole range of protists and microbial populations detected with the use of “omics” technologies, including e.g. next generation sequencing and ecological metabolomics.
