Mangroves and Their Response to a Heavy Metal Polluted Wetland in The North Coast of Puerto Rico

Maldonado-Román, Marixa; Jiménez-Collazo, Johannys; Malavé-Llamas, Karlo; Musa-Wasil, Juan C.

doi:10.11594/jtls.06.03.13

Cited by 10 publications

(3 citation statements)

References 22 publications

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“…Heavy metals, including Cd, Hg and Pb, could be introduced into herbal drugs through a contaminated environment (water, soil). Since heavy metals (including Pb, Hg, Cd) are known to accumulate in R. mucronata, because the plant grows in the mangrove ecosystem [62], it is of particular importance to monitor its heavy metal content. The WHO proposed heavy metal limits of 10 mg/kg for Pb and 0.3 mg/kg for Cd in herbal medicines [31].…”

Section: Discussionmentioning

confidence: 99%

α-Glucosidase Inhibitory Activity of Tea and Kombucha from Rhizophora mucronata Leaves

Puspitasari,

Tuenter,

Breynaert

et al. 2024

Beverages

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A decoction of Rhizophora mucronata Lam. mangrove bark is used as an antidiabetic treatment in Asia. Kombucha tea is a fermented beverage, which is also claimed to be antidiabetic. In this work, the potency of R. mucronata leaves as α-glucosidase inhibitor was studied to assess whether it could be a suitable alternative to the use of R. mucronata bark. α-glucosidase inhibitory activities were determined for three extracts prepared from R. mucronata leaves, being the unfermented tea of R. mucronata leaves, the fermented kombucha tea and an 80% methanolic extract of the residual R. mucronata leaves. Flavonoid glycosides were identified in tea powder, kombucha tea and in the crude methanolic extract. Both the unfermented tea and the kombucha tea after 7 days of fermentation inhibited α-glucosidase with IC50 values of 0.12 ± 0.02 mg/mL and 0.09 ± 0.04 mg/mL, respectively. The methanolic extract showed a stronger α-glucosidase inhibitory activity compared to the kombucha tea and tea powder with an IC50 value of 0.0435 ± 0.0007 mg/mL. Acarbose, used as a positive control, inhibited α-glucosidase with an IC50 value of 2.4 ± 0.2 mg/mL. It was found that the three types of preparations of R. mucronata all were potent α-glucosidase inhibitors.

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Section: Discussionmentioning

confidence: 99%

α-Glucosidase Inhibitory Activity of Tea and Kombucha from Rhizophora mucronata Leaves

Puspitasari,

Tuenter,

Breynaert

et al. 2024

Beverages

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“…They efficiently trap toxic metals at the root-sediment interface, avoiding plant uptake, which enables these trees to colonize natural or anthropogenic metal-rich sediments. This property is used to minimize metal pollution, such as in coastal landfill sites as observed in restored mangroves in Australia and Southeast Brazil, for example (Clark et al, 1997;Lacerda et al, 2001;Machado et al, 2002a,b;Maldonado-Román et al, 2016).…”

Section: Sea Level Risementioning

confidence: 99%

Mangrove Trace Metal Biogeochemistry Response to Global Climate Change

Lacerda¹,

Ward²,

Borges³

et al. 2022

Front. For. Glob. Change

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This review discusses observed impacts from different climate change-driven pressures on mangrove's role in modulating trace metal transfer at the land-ocean interface. It contributes to the literature in a global context and shows mangroves as mitigators or providing positive feedback to metal mobilization. Most chalcophile metals2+ accumulate in mangrove soils associated with sulfides while high sedimentation rates avoid their oxidation. Exudation of oxygen by roots fixates Fe, which co-precipitates metals as oxyhydroxides in the rhizosphere. These two biogeochemical processes reduce trace metal availability to plants and their mobility within estuaries. However, climate change-driven pressures alter this geochemical equilibrium. Increasing atmospheric CO2 and temperature, and the intensity and frequency of extreme climatic events, have proved to affect mangrove functioning and cover, but no direct observation on the impact on metal biogeochemistry is presently available, whereas sea level rise and saline intrusion impacts on the fate of metals have already been observed. Sea level rise increases erosion, that dissociates deposited sulfides releasing metals to the water column. Released metals adsorb onto suspended particles and can re-deposit in the estuary or are exported to continental shelf sediments. Saline intrusion may oxidize deeper sediment layers releasing metals to porewaters. Part of the mobilized metals may remain in solution complexed with DOM and have their bioavailability increased, as shown by high bioaccumulation factors and biomagnification and high metal concentrations in the estuarine biota, which results in higher human exposure through fisheries consumption. Since erosion occurs preferentially at the sea border and higher sedimentation at the higher reaches of the estuary, triggering mangroves migration landward, spatial gradients are formed, and shall be taken into consideration when planning mitigation or adaptation strategies. These observations suggest disruption of traditional humans dwelling in mangrove dominated coastlines by increasing contamination of coastal fisheries, often the principal protein source for those groups and an important source of income. Further research into the environmental and socioeconomic impacts of climate change driven alterations to metal biogeochemical processes in mangroves as contaminant levels are expected to increase.

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“…Another possible explanation is that nutrient enrichment, and P in particular, altered the element and nutrient balance in mangrove tissues, which affected the uptake, transport, and accumulation of iron in leaves. Unlike other mangrove species prone to excluding metals at the root level, black mangroves are iron-excreting species, capable of taking up more metals and translocating them to their leaves where they are excreted (Maldonado-Román et al, 2012). Thus, nutrient enrichment may have affected Fe uptake, which was reflected as lower Fe concentrations in leaves (Figure A 5.3).…”

Section: Discussionmentioning

confidence: 99%

Mangroves in a transforming world : Biogeochemical interactions, global change drivers, and innovative mitigation strategies

Pino Cobacho

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Tropical seascapes rely on the feedback relationships among mangrove forests, seagrass meadows, and coral reefs, as they mutually facilitate and enhance each other's functionality. Biogeochemical fluxes link tropical coastal habitats by exchanging material flows and energy through various natural processes that determine the conditions for life and ecosystem functioning. However, little is known about the seascape-scale implications of anthropogenic disruptions to these linkages. Despite the limited number of integrated empirical studies available (with only 11 out of 81 selected studies focusing on the integrated dynamics of mangroves, seagrasses, and corals), this review emphasizes the importance of biogeochemical fluxes for ecosystem connectivity in tropical seascapes. It identifies four anthropogenic drivers that can disturb these fluxes, including nutrient pollution, pH imbalance, disease outbreaks, and other forms of environmental degradation. This review also highlights significant knowledge gaps in our understanding of biogeochemical fluxes and ecosystem responses to perturbations in tropical seascapes. Addressing these knowledge gaps is crucial for developing practical strategies to conserve and manage connected seascapes effectively. Integrated research is needed to shed light on the complex interactions and feedback mechanisms within these ecosystems, providing valuable insights for conservation and management practices.

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Mangroves and Their Response to a Heavy Metal Polluted Wetland in The North Coast of Puerto Rico

Cited by 10 publications

References 22 publications

α-Glucosidase Inhibitory Activity of Tea and Kombucha from Rhizophora mucronata Leaves

α-Glucosidase Inhibitory Activity of Tea and Kombucha from Rhizophora mucronata Leaves

Mangrove Trace Metal Biogeochemistry Response to Global Climate Change

Mangroves in a transforming world : Biogeochemical interactions, global change drivers, and innovative mitigation strategies

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