Percorrer por autor "Barrena de los Santos, Carmen"
A mostrar 1 - 10 de 13
Resultados por página
Opções de ordenação
- Anthropogenic microparticles accumulation in small-bodied seagrass meadows: the case of tropical estuarine species in BrazilPublication . Souza, Ana M. C.; Ferreira, Guilherme V. B.; Barrena de los Santos, Carmen; Frédou, Flávia L.; Magalhães, Karine M.Seagrass meadows have recently been highlighted as potential hotspots for microplastic and anthropogenic microparticles (APs). This study assessed AP accumulation in shallow sediments vegetated by small-bodied seagrass species (Halodule wrightii, Halophila decipiens, and H. baillonii) and in the adjacent unvegetated area in a tropical estuary on the East Coast of South America, Brazil, over the seasonal cycle. Anthropogenic microparticles were detected in 80 % of the samples, with a mean abundance of 142 +/- 140 particles kg(-1) dw (N = 80). Particles were predominantly blue (51 %), fiber (73 %), and smaller than 1 mm (80 %). We observed that seagrass sediments retained APs, although no significant variation was observed between seagrass and the unvegetated area, nor between the dry and rainy seasons. A positive correlation was found between sediment grain size and AP abundance. This study represents the first record of AP contamination in seagrasses from the Tropical Southwestern Atlantic bioregion.
- Carbono Azul: Os 10 principais ecossistemas de carbono azul em Portugal continentalPublication . Santos, Rui; Ito, Paula; Barrena de los Santos, CarmenO segundo volume do relatório científico do projeto Gulbenkian Carbono Azul – Relatório Científico II: Os 10 principais ecossistemas de carbono azul em Portugal continental – complementa e dá suporte ao primeiro volume, Relatório Científico I: Avaliação dos ecossistemas de carbono azul em Portugal continental, ao apresentar informação detalhada, sob a forma de fichas técnicas, para cada um dos ecossistemas de carbono azul estudados. As fichas técnicas incluem a localização geográfica, os tipos de habitats e a área que ocupam, os estatutos de proteção em que estão incluídos, as estimativas de stocks e de taxas de sequestro de carbono, a qualidade ambiental, as ameaças a que estão expostos e as intervenções de conservação implementadas no passado, em curso ou outras aqui propostas para o futuro. Cada ficha culmina com o levantamento das partes interessadas locais para que sejam desencadeados processos de conservação e restauro dos sistemas em análise.
- Climate effects on belowground tea litter decomposition depend on ecosystem and organic matter types in global wetlands.Publication . Trevathan-Tackett, Stacey M.; Kepfer-Rojas, Sebastian; Malerba, Martino; Macreadie, Peter I.; Djukic, Ika; Zhao, Junbin; Young, Erica B.; York, Paul H.; Yeh, Shin-Cheng; Xiong, Yanmei; Winters, Gidon; Whitlock, Danielle; Weaver, Carolyn A.; Watson, Anne; Visby, Inger; Tylkowski, Jacek; Trethowan, Allison; Tiegs, Scott; Taylor, Ben; Szpikowski, Jozef; Szpikowska, Grażyna; Strickland, Victoria L; Stivrins, Normunds; Sousa, Ana I.; Sinutok, Sutinee; Scheffel, Whitney A.; Sanderman, Jonathan; Sánchez-Carrillo, Salvador; Sanchez-Cabeza, Joan-Albert; Rymer, Krzysztof G.; Ruiz-Fernandez, Ana Carolina; Robroek, Bjorn J. M.; Roberts, Tessa; Ricart, Aurora M.; Reynolds, Laura K.; Rachlewicz, Grzegorz; Prathep, Anchana; Pinsonneault, Andrew J; Pendall, Elise; Payne, Richard; Ozola, Ilze; Onufrock, Cody; Ola, Anne; Oberbauer, Steven F; Numbere, Aroloye O.; Novak, Alyssa B.; Norkko, Joanna; Norkko, Alf; Mozdzer, Thomas J.; Morgan, Pam; Montemayor, Diana I.; Martin, Charles W.; Malone, Sparkle L.; Major, Maciej; Majewski, Mikołaj; Lundquist, Carolyn J.; Lovelock, Catherine E; Liu, Songlin; Lin, Hsing-Juh; Lillebo, Ana; Li, Jinquan; Kominoski, John S.; Khuroo, Anzar Ahmad; Kelleway, Jeffrey J.; Jinks, Kristin I.; Jerónimo, Daniel; Janousek, Christopher; Jackson, Emma L.; Iribarne, Oscar; Hanley, Torrance; Hamid, Maroof; Gupta, Arjun; Guariento, Rafael D.; Grudzinska, Ieva; da Rocha Gripp, Anderson; González Sagrario, María A.; Garrison, Laura M.; Gagnon, Karine; Gacia, Esperança; Fusi, Marco; Farrington, Lachlan; Farmer, Jenny; de Assis Esteves, Francisco; Escapa, Mauricio; Domańska, Monika; Dias, André T. C.; Daffonchio, Daniele; Czyryca, Paweł M.; Connolly, Rod M.; Cobb, Alexander; Chudzińska, Maria; Christiaen, Bart; Chifflard, Peter; Castelar, Sara; Carneiro, Luciana S.; Cardoso-Mohedano, José Gilberto; Camden, Megan; Caliman, Adriano; Bulmer, Richard H.; Bowen, Jennifer; Boström, Christoffer; Bernal, Susana; Berges, John A.; Benavides, Juan C.; Barry, Savanna C.; Alatalo, Juha M.; Al-Haj, Alia N.; Adame, Maria Fernanda; Barrena de los Santos, Carmen; Santos, RuiPatchy global data on belowground litter decomposition dynamics limit our capacity to discern the drivers of carbon preservation and storage across inland and coastal wetlands. We performed a global, multiyear study in over 180 wetlands across 28 countries and 8 macroclimates using standardized litter as measures of "recalcitrant" (rooibos tea) and "labile" (green tea) organic matter (OM) decomposition. Freshwater wetlands and tidal marshes had the highest tea mass remaining, indicating a greater potential for carbon preservation in these ecosystems. Recalcitrant OM decomposition increased with elevated temperatures throughout the decay period, e.g., increase from 10 to 20 °C corresponded to a 1.46-fold increase in the recalcitrant OM decay rate constant. The effect of elevated temperature on labile OM breakdown was ecosystem-dependent, with tidally influenced wetlands showing limited effects of temperature compared with freshwater wetlands. Based on climatic projections, by 2050 wetland decay constants will increase by 1.8% for labile and 3.1% for recalcitrant OM. Our study highlights the potential for reduction in belowground OM in coastal and inland wetlands under increased warming, but the extent and direction of this effect at a large scale is dependent on ecosystem and OM characteristics. Understanding local versus global drivers is necessary to resolve ecosystem influences on carbon preservation in wetlands.
- Climate effects on belowground tea litter decomposition depend on ecosystem and organic matter types in global wetlands.Publication . Trevathan-Tackett, Stacey M.; Kepfer-Rojas, Sebastian; Malerba, Martino; Macreadie, Peter I.; Djukic, Ika; Zhao, Junbin; Young, Erica B.; York, Paul H.; Yeh, Shin-Cheng; Xiong, Yanmei; Winters, Gidon; Whitlock, Danielle; Weaver, Carolyn A.; Watson, Anne; Visby, Inger; Tylkowski, Jacek; Trethowan, Allison; Tiegs, Scott; Taylor, Ben; Szpikowski, Jozef; Szpikowska, Grażyna; Strickland, Victoria L.; Stivrins, Normunds; Sousa, Ana I.; Sinutok, Sutinee; Scheffel, Whitney A.; Santos, Rui; Sanderman, Jonathan; Sánchez-Carrillo, Salvador; Sanchez-Cabeza, Joan-Albert; Rymer, Krzysztof G.; Ruiz-Fernandez, Ana Carolina; Robroek, Bjorn J. M.; Roberts, Tessa; Ricart, Aurora M.; Reynolds, Laura K.; Rachlewicz, Grzegorz; Prathep, Anchana; Pinsonneault, Andrew J.; Pendall, Elise; Payne, Richard; Ozola, Ilze; Onufrock, Cody; Ola, Anne; Oberbauer, Steven F.; Numbere, Aroloye O.; Novak, Alyssa B.; Norkko, Joanna; Norkko, Alf; Mozdzer, Thomas J.; Morgan, Pam; Montemayor, Diana I.; Martin, Charles W.; Malone, Sparkle L.; Major, Maciej; Majewski, Mikołaj; Lundquist, Carolyn J.; Lovelock, Catherine E.; Liu, Songlin; Lin, Hsing-Juh; Lillebo, Ana; Li, Jinquan; Kominoski, John S.; Khuroo, Anzar Ahmad; Kelleway, Jeffrey J.; Jinks, Kristin I.; Jerónimo, Daniel; Janousek, Christopher; Jackson, Emma L.; Iribarne, Oscar; Hanley, Torrance; Hamid, Maroof; Gupta, Arjun; Guariento, Rafael D.; Grudzinska, Ieva; da Rocha Gripp, Anderson; González Sagrario, María A.; Garrison, Laura M.; Gagnon, Karine; Gacia, Esperança; Fusi, Marco; Farrington, Lachlan; Farmer, Jenny; Esteves, Francisco de Assis; Escapa, Mauricio; Domańska, Monika; Dias, André T. C.; Barrena de los Santos, Carmen; Daffonchio, Daniele; Czyryca, Paweł M.; Connolly, Rod M.; Cobb, Alexander; Chudzińska, Maria; Christiaen, Bart; Chifflard, Peter; Castelar, Sara; Carneiro, Luciana S.; Cardoso-Mohedano, José Gilberto; Camden, Megan; Caliman, Adriano; Bulmer, Richard H.; Bowen, Jennifer; Boström, Christoffer; Bernal, Susana; Berges, John A.; Benavides, Juan C.; Barry, Savanna C.; Alatalo, Juha M.; Al-Haj, Alia N.; Adame, Maria FernandaPatchy global data on belowground litter decomposition dynamics limit our capacity to discern the drivers of carbon preservation and storage across inland and coastal wetlands. We performed a global, multiyear study in over 180 wetlands across 28 countries and 8 macroclimates using standardized litter as measures of "recalcitrant" (rooibos tea) and "labile" (green tea) organic matter (OM) decomposition. Freshwater wetlands and tidal marshes had the highest tea mass remaining, indicating a greater potential for carbon preservation in these ecosystems. Recalcitrant OM decomposition increased with elevated temperatures throughout the decay period, e.g., increase from 10 to 20 °C corresponded to a 1.46-fold increase in the recalcitrant OM decay rate constant. The effect of elevated temperature on labile OM breakdown was ecosystem-dependent, with tidally influenced wetlands showing limited effects of temperature compared with freshwater wetlands. Based on climatic projections, by 2050 wetland decay constants will increase by 1.8% for labile and 3.1% for recalcitrant OM. Our study highlights the potential for reduction in belowground OM in coastal and inland wetlands under increased warming, but the extent and direction of this effect at a large scale is dependent on ecosystem and OM characteristics. Understanding local versus global drivers is necessary to resolve ecosystem influences on carbon preservation in wetlands.
- Climate effects on belowground tea litter decomposition depend on ecosystem and organic matter types in global wetlands.Publication . Trevathan-Tackett, Stacey M; Kepfer-Rojas, Sebastian; Malerba, Martino; Macreadie, Peter I; Djukic, Ika; Zhao, Junbin; Young, Erica B; York, Paul H; Yeh, Shin-Cheng; Xiong, Yanmei; Winters, Gidon; Whitlock, Danielle; Weaver, Carolyn A; Watson, Anne; Visby, Inger; Tylkowski, Jacek; Trethowan, Allison; Tiegs, Scott; Taylor, Ben; Szpikowski, Jozef; Szpikowska, Grażyna; Strickland, Victoria L; Stivrins, Normunds; Sousa, Ana I; Sinutok, Sutinee; Scheffel, Whitney A; Santos, Rui; Sanderman, Jonathan; Sánchez-Carrillo, Salvador; Sanchez-Cabeza, Joan-Albert; Rymer, Krzysztof G; Ruiz-Fernandez, Ana Carolina; Robroek, Bjorn J M; Roberts, Tessa; Ricart, Aurora M; Reynolds, Laura K; Rachlewicz, Grzegorz; Prathep, Anchana; Pinsonneault, Andrew J; Pendall, Elise; Payne, Richard; Ozola, Ilze; Onufrock, Cody; Ola, Anne; Oberbauer, Steven F; Numbere, Aroloye O; Novak, Alyssa B; Norkko, Joanna; Norkko, Alf; Mozdzer, Thomas J; Morgan, Pam; Montemayor, Diana I; Martin, Charles W; Malone, Sparkle L; Major, Maciej; Majewski, Mikołaj; Lundquist, Carolyn J; Lovelock, Catherine E; Liu, Songlin; Lin, Hsing-Juh; Lillebo, Ana; Li, Jinquan; Kominoski, John S; Khuroo, Anzar Ahmad; Kelleway, Jeffrey J; Jinks, Kristin I; Jerónimo, Daniel; Janousek, Christopher; Jackson, Emma L; Iribarne, Oscar; Hanley, Torrance; Hamid, Maroof; Gupta, Arjun; Guariento, Rafael D; Grudzinska, Ieva; da Rocha Gripp, Anderson; González Sagrario, María A; Garrison, Laura M; Gagnon, Karine; Gacia, Esperança; Fusi, Marco; Farrington, Lachlan; Farmer, Jenny; de Assis Esteves, Francisco; Escapa, Mauricio; Domańska, Monika; Dias, André T C; Barrena de los Santos, Carmen; Daffonchio, Daniele; Czyryca, Paweł M; Connolly, Rod M; Cobb, Alexander; Chudzińska, Maria; Christiaen, Bart; Chifflard, Peter; Castelar, Sara; Carneiro, Luciana S; Cardoso-Mohedano, José Gilberto; Camden, Megan; Caliman, Adriano; Bulmer, Richard H; Bowen, Jennifer; Boström, Christoffer; Bernal, Susana; Berges, John A; Benavides, Juan C; Barry, Savanna C; Alatalo, Juha M; Al-Haj, Alia N; Adame, Maria FernandaPatchy global data on belowground litter decomposition dynamics limit our capacity to discern the drivers of carbon preservation and storage across inland and coastal wetlands. We performed a global, multiyear study in over 180 wetlands across 28 countries and 8 macroclimates using standardized litter as measures of "recalcitrant" (rooibos tea) and "labile" (green tea) organic matter (OM) decomposition. Freshwater wetlands and tidal marshes had the highest tea mass remaining, indicating a greater potential for carbon preservation in these ecosystems. Recalcitrant OM decomposition increased with elevated temperatures throughout the decay period, e.g., increase from 10 to 20 °C corresponded to a 1.46-fold increase in the recalcitrant OM decay rate constant. The effect of elevated temperature on labile OM breakdown was ecosystem-dependent, with tidally influenced wetlands showing limited effects of temperature compared with freshwater wetlands. Based on climatic projections, by 2050 wetland decay constants will increase by 1.8% for labile and 3.1% for recalcitrant OM. Our study highlights the potential for reduction in belowground OM in coastal and inland wetlands under increased warming, but the extent and direction of this effect at a large scale is dependent on ecosystem and OM characteristics. Understanding local versus global drivers is necessary to resolve ecosystem influences on carbon preservation in wetlands.
- First assessment of blue carbon stocks, sequestration rates and potential sources since 1900 at Arguin Island (Mauritania)Publication . Martins, Márcio; Abrantes, Fatima; Aires, Tania; Rautenbach, Sarah; Engelen, Aschwin; Encarnação, João Pedro da Silva; Abecasis, David; Gandega, Cheikhna; Magalhães, Vitor; Brahim, Khallahi; Ebaye, Sidina; Barusseau, Jean-Paul; Freiwald, André; Barrena de los Santos, Carmen; Serrao, Ester A.; Santos, RuiGlobal blue carbon assessments are hindered by a lack of data from understudied seagrass regions, such as those of Western Africa. This study reports the first in situ records of organic carbon (OC) stocks and burial rates for seagrass beds at Arguin Island, Banc d'Arguin (Mauritania), Western Africa, measured in intertidal Zostera noltei and subtidal Cymodocea nodosa meadows. The major blue carbon sources in seagrass meadows since 1900 were assessed using sedimentary environmental DNA (eDNA) and chronostratigraphy. The OC stocks in the top 50 cm of the sediment cores were not significantly different between the beds of the two seagrass species and averaged 27.8±7.14 Mg C ha−1, which is 5 times higher than that in adjacent unvegetated sediments. The OC sequestration rate for the past 100 years was 10.3±1.4 g C m−2 year−1 in C. nodosa sediments and 12.3±5.9 g C m−2 year−1 in Z. noltei sediments. Sedimentary eDNA analysis revealed that the major OC source within the C. nodosa and Z. noltei sediments has been the seagrass species itself, with low contributions from allochthonous eDNA reads. Carbon sources in Z. noltei meadows were more diverse than those in C. nodosa meadows. In bare sediment, diatoms were the major carbon source. The present study demonstrates the potential of sedimentary eDNA to reveal the major sources of organic matter in blue carbon ecosystems, improving our understanding of the provenance of sedimentary OC and thus carbon cycling processes. Additionally, it provides new OC stock and sequestration rate measurements from a region of the world that remains underrepresented in global blue carbon assessments.
- Mapping saltmarsh vertical distribution communities in southern Portugal using high spatiotemporal resolution satellite imageryPublication . Martins, Márcio; Parreira, Filipe; Ito, Paula; Santos, Rui; Gotha, Simon von sachsen-Coburg Und; Barrena de los Santos, CarmenSaltmarshes, transitional coastal habitats between terrestrial and marine ecosystems, offer crucial ecological benefits, including coastal protection, biodiversity enhancement, water purification and carbon sequestration. However, saltmarsh areas are shrinking, primarily due to human activities. Traditional monitoring approaches for saltmarsh coverage are often costly and restricted in spatial scope, prompting a shift towards remote sensing techniques. While remote sensing has proven effective for studies that cover large spatial areas, its application for smaller areas remains challenging. In this study, we trained classification models to identify saltmarsh vegetation communities in southern Portugal. We utilized high-resolution (3-metre) and high-frequency (near-daily) imagery to optimize image selection according to tidal conditions at the time of capture and developed an elevation proxy for the intertidal zone. Our model achieved an overall accuracy of 67%, estimating a total of 4,572 ha of saltmarsh in southern Portugal, 85% located in the Ria Formosa lagoon. The middle saltmarsh zone, dominated by Atriplex portulacoides, Salicornia perennis and Salicornia fruticosa, covered the largest area. The approach presented here holds promise for further refinement, enabling automated, high-resolution monitoring of saltmarsh communities, which is essential for conservation and management initiatives.
- A marine and salt marsh sediment organic carbon database for European regional seas (EURO-CARBON).Publication . Graversen, Anna Elizabeth Løvgren; Lønborg, Christian; Addamo, Anna Maria; Pedersen, Sidsel Gurholt; Chemello, Silvia; Alejo, Irene; Apostolaki, Eugenia T.; Asplund, Maria E.; Austin, William E. N.; Berov, Dimitar; Berto, Daniela; Björk, Mats; Black, Kirsty; Bobchev, Nikola; Bonaglia, Stefano; Borgersen, Gunhild; Bouma, Tjeerd; Costello, Mark J.; Dahl, Martin; Diaz-Almela, Elena; Dimitriou, Panagiotis D.; Duarte, Carlos M.; Dueñas, Carmen Leiva; Efthymiadis, Pavlos T.; Elosegui, Ines Mazarrasa; Espinosa, Maria Recio; Filipsson, Helena L.; Fontela, Marcos; Fredriksen, Stein; Frigstad, Helene; Gagnon, Karine; Garcia-Escudero, Catalina A.; Giani, Michele; Grouhel-Pellouin, Anne; Guerra, Roberta; Gullström, Martin; Gundersen, Hege; Hancke, Kasper; Majtényi-Hill, Claudia; Hunt, Corallie; Inostroza, Karina; Karakassis, Ioannis; Karamfilov, Ventzislav; Klayn, Stefania; Koziorowska, Katarzyna; Kuliński, Karol; Lavery, Paul; Lenstra, Wytze K.; Lillebø, Ana I.; Logemann, Ella; Magni, Paolo; Marbà, Núria; Marco-Mendez, Candela; Martins, Márcio; Mateo, Miguel Angel; Monnier, Briac; Mueller, Peter; Neto, Joao M.; Papageorgiou, Nafsika; de Rezende, Carlos Eduardo; Pardo, Juan Carlos Farias; Peña, Jose Antonio Juanes De La; Pergent, Gérard; Piñeiro-Juncal, Nerea; Preston, Joanne; Rampazzo, Federico; Reithmaier, Gloria; Reusch, Thorsten B. H.; Reynolds, Sarah; Ricart, Aurora M.; Santos, Rui; Barrena de los Santos, Carmen; Santos, Isaac R.; Serrano, Eduard; Serrano, Oscar; Slomp, Caroline P.; Smeaton, Craig; Soler, Montserrar; Sousa, Ana I.; Spiegel, Timo; Stevenson, Angela; Thormar, Jonas; Trannum, Hilde Cecilie; van Helmond, Niels A. G. M.; Paradis, Sarah; Vizzini, Salvatrice; Ward, Emma A.; Yau, Yvonne Y. Y.; Zakhama-Sraieb, Rym; Zribi, Imen; Zygadlowska, Olga M.; Jensen, Dorte KrauseMarine and salt marsh sediments contain large amounts of organic carbon (OC) and are therefore important in the global carbon cycle. Here, we collated previously published and unpublished measurements of sediment OC in marine and salt marsh sediments in European regional seas (EURO-CARBON; available at https://doi.org/10.5281/zenodo.14905489). To the extent possible the OC data were complemented by variables such as sediment porosity and dry bulk density. The EUROCARBON dataset holds 61306 individual data entries of sediment OC content from different regions of European regional seas. Around three quarters (76%) were collected in coastal and deep sea bare sediments, 18% from salt marshes, 7% from seagrass habitats, and 0.03% from macroalgal habitats. For all habitats and sediment depth layers the OC content varied between seagrass (2.37 ± 5.96 %; 3.03 %) > bare sediment (1.88 ± 2.03 %; 1.20 %). The EURO-CARBON dataset will serve as a basis for future work, and it will be an important resource for researchers, managers, and policymakers working towards protecting sediment OC pools.
- The role of lag phases between real-term marine heatwaves in the trait responses of two macrophyte speciesPublication . Gillis, Lucy G.; Román, Salvador; Gustafsson, Camilla; Kauppi, Laura; Barrena de los Santos, Carmen; Varela, Zulema; Viana, Inés G.Coastal marine macrophytes are critical ecosystem engineers providing valuable ecosystem services. However, they experience detrimental impacts from climate change-induced stresses such as marine heatwaves (MHW), which are becoming more intense and frequent. This study investigated trait responses in real-term heatwaves, Continuous (1MHW) and Consecutive (with a 4-day lag phase, 2MHW), on two key macrophytes, the seaweed Fucus vesiculosus and seagrass Zostera marina. Our results showed very few negative effects on traits from both temperature treatments. Physiological traits indicated that both macrophytes were not stressed by the treat ments. Fucus vesiculosus showed little response to changes in temperature and the 2MHW treatment, which considered the lag phase, showed larger changes in frond area compared to the 1MHW treatment. In Z. marina, leaves presented statistically significant higher carbon content in the 1MHW treatment than in the control. Significantly higher leaf elongation rates and leaf width were also observed in Z. marina for the 2MHW treatment in comparison to the control. Fucus vesiculosus showed high acclimatization to changes in temperature, likely because it is a species adapted to grow in dynamic intertidal habitats. Contrary, Z. marina appeared to be more sensitive to the 1MHW treatment, as more significant changes were observed, however, the lag phase seemed not to be important in Z. marina as there was no change in trait response. Exploring the role of lag phases of different duration in the context of real-term MHW predictions is an important research direction and has relevance for ecosystem resistance that will ultimately affect the resilience of marine macrophyte populations.
- Seagrasses in coastal wetlands of the Algarve region (southern Portugal): past and present distribution and extentPublication . Ito, Paula; Martins, Márcio; von Sachsen-Coburg und Gotha, Simon; Santos, Rui; Barrena de los Santos, CarmenThe global biodiversity crisis urges to update the distribution maps of natural habitats, especially those that are in rapid decline and play a key role in ecosystem functioning, such as seagrasses. In Portugal, seagrass meadows have declined substantially since the 1980s and are considered one of the most endangered marine habitats. Here we aimed to 1) compile records on the distribution and area extent of seagrass meadows in the four wetlands of the Algarve region (southern Portugal) with historical occurrence of seagrasses, based on a systematic review, and 2) update the distribution maps and area extent of seagrass meadows in this region using a combination of manual and machine learning mapping techniques. The systematic review showed a general lack of data on the distribution of seagrass meadows in the Algarve, with patchy information at different times and using incomparable mapping techniques. Based on the updated mapping from 2019 to 2023, well-developed seagrass meadows were only found in the Ria Formosa lagoon and the Guadiana estuary. In the Ria de Alvor, some sparce scattered patches of seagrass were observed in the intertidal zone, while no seagrass was found in the Arade estuary. The total extent of seagrass in the Algarve region was estimated at 1231 ha, with nearly all (99 %) occurring in the Ria Formosa, where 85 % was intertidal. Although assessing temporal trends remains challenging due to methodological differences and data limitations, the estimated 20 % decline and ongoing pressures on seagrass meadows in Algarve wetlands underscore the urgent need for continuous, standardized monitoring of their distribution, extent, and condition.