Seasonal bottom-up and top-down control of plankton in a hypereutrophic macrotidal lagoon on Brazil's equatorial coast.
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| Natura: | Artículo científico |
| Lingua: | en |
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Environmental monitoring and assessment
2026
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| _version_ | 1868266071871455232 |
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| author | Cutrim, Marco Valério Jansen Nunes, Yago Bruno Silveira Sá, Ana Karoline Duarte Dos Santos Cruz, Quedyane Silva da Azevedo-Cutrim, Andrea Christina Gomes de Furtado, Jordana Adorno |
| author_facet | Cutrim, Marco Valério Jansen Nunes, Yago Bruno Silveira Sá, Ana Karoline Duarte Dos Santos Cruz, Quedyane Silva da Azevedo-Cutrim, Andrea Christina Gomes de Furtado, Jordana Adorno Cutrim, Marco Valério Jansen Nunes, Yago Bruno Silveira Sá, Ana Karoline Duarte Dos Santos Cruz, Quedyane Silva da Azevedo-Cutrim, Andrea Christina Gomes de Furtado, Jordana Adorno |
| collection | PubMed - marine biology |
| contents | Seasonal bottom-up and top-down control of plankton in a hypereutrophic macrotidal lagoon on Brazil's equatorial coast. Cutrim, Marco Valério Jansen Nunes, Yago Bruno Silveira Sá, Ana Karoline Duarte Dos Santos Cruz, Quedyane Silva da Azevedo-Cutrim, Andrea Christina Gomes de Furtado, Jordana Adorno Brazil Seasons Environmental Monitoring Phytoplankton Eutrophication Animals Chlorophyll A Plankton Zooplankton Seawater Tropical coastal lagoons often show pronounced seasonal forcing that modulates nutrient supply, light climate, and grazer pressure. We surveyed hypereutrophic Jansen Lagoon (São Luís Island, Brazil) in four campaigns during 2017 (rainy: March and April; dry: September and November) at nine near-surface stations sampled on ebb tide. Phytoplankton and zooplankton were collected and analyzed together with chlorophyll-a and nutrients to assess short-term community responses. Clustering and nMDS revealed clear rainy-dry segregation of communities, and dbRDA linked dry-season samples to higher salinity, turbidity, TP, and silicate, whereas rainy-season samples were associated with higher dissolved oxygen, Secchi depth, ammonium, and DIN. Generalized linear models explained 65% of phytoplankton variance: density increased with DIP and decreased with dissolved oxygen and with the rotifer Filinia longiseta, indicating concurrent bottom-up (nutrients, light/renewal) and top-down (grazing) controls. Microcystis wesenbergii and M. aeruginosa exhibited frequent peaks, underscoring eutrophic risk, though values remained below the bloom threshold applied here. Overall, bottom-up control predominated in the rainy season, whereas grazer pressure intensified in the dry season. Management should couple nutrient-load reductions with measures that shorten residence time, reduce resuspension, and restore macrophytes, with priority to urban margins and semi-enclosed embayments; routine tracking of DO percent saturation, DIN/DIP, Secchi depth, and chlorophyll-a is recommended for long-term assessment. |
| format | Artículo científico |
| id | pubmed_41840241 |
| institution | PubMed |
| language | en |
| publishDate | 2026 |
| publisher | Environmental monitoring and assessment |
| record_format | pubmed |
| spellingShingle | Seasonal bottom-up and top-down control of plankton in a hypereutrophic macrotidal lagoon on Brazil's equatorial coast. Cutrim, Marco Valério Jansen Nunes, Yago Bruno Silveira Sá, Ana Karoline Duarte Dos Santos Cruz, Quedyane Silva da Azevedo-Cutrim, Andrea Christina Gomes de Furtado, Jordana Adorno Brazil Seasons Environmental Monitoring Phytoplankton Eutrophication Animals Chlorophyll A Plankton Zooplankton Seawater Seasonal bottom-up and top-down control of plankton in a hypereutrophic macrotidal lagoon on Brazil's equatorial coast. Cutrim, Marco Valério Jansen Nunes, Yago Bruno Silveira Sá, Ana Karoline Duarte Dos Santos Cruz, Quedyane Silva da Azevedo-Cutrim, Andrea Christina Gomes de Furtado, Jordana Adorno Brazil Seasons Environmental Monitoring Phytoplankton Eutrophication Animals Chlorophyll A Plankton Zooplankton Seawater Tropical coastal lagoons often show pronounced seasonal forcing that modulates nutrient supply, light climate, and grazer pressure. We surveyed hypereutrophic Jansen Lagoon (São Luís Island, Brazil) in four campaigns during 2017 (rainy: March and April; dry: September and November) at nine near-surface stations sampled on ebb tide. Phytoplankton and zooplankton were collected and analyzed together with chlorophyll-a and nutrients to assess short-term community responses. Clustering and nMDS revealed clear rainy-dry segregation of communities, and dbRDA linked dry-season samples to higher salinity, turbidity, TP, and silicate, whereas rainy-season samples were associated with higher dissolved oxygen, Secchi depth, ammonium, and DIN. Generalized linear models explained 65% of phytoplankton variance: density increased with DIP and decreased with dissolved oxygen and with the rotifer Filinia longiseta, indicating concurrent bottom-up (nutrients, light/renewal) and top-down (grazing) controls. Microcystis wesenbergii and M. aeruginosa exhibited frequent peaks, underscoring eutrophic risk, though values remained below the bloom threshold applied here. Overall, bottom-up control predominated in the rainy season, whereas grazer pressure intensified in the dry season. Management should couple nutrient-load reductions with measures that shorten residence time, reduce resuspension, and restore macrophytes, with priority to urban margins and semi-enclosed embayments; routine tracking of DO percent saturation, DIN/DIP, Secchi depth, and chlorophyll-a is recommended for long-term assessment. |
| title | Seasonal bottom-up and top-down control of plankton in a hypereutrophic macrotidal lagoon on Brazil's equatorial coast. |
| topic | Brazil Seasons Environmental Monitoring Phytoplankton Eutrophication Animals Chlorophyll A Plankton Zooplankton Seawater |
| url | https://pubmed.ncbi.nlm.nih.gov/41840241/ |