Contrasting land-uses in two small river basins impact the colored dissolved organic matter concentration and carbonate system along a river-coastal ocean continuum

Curra-Sánchez, Elizabeth D.; Lara, Carlos; Cornejo-D’Ottone, Marcela; Nimptsch, Jorge; Aguayo, Mauricio; Broitman, Bernardo R.; Saldías, Gonzalo S.; Vargas, Cristian A.

doi:10.1016/j.scitotenv.2021.150435

Cited by 18 publications

(9 citation statements)

References 127 publications

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“…1B). There are increasing lines of evidence that changing land use in river basins can also drive significant changes in quantity and quality of terrestrial riverine material exported to the adjacent coastal areas, impacting seawater alkalinity, partial pressure of carbon dioxide (pCO 2 ), and pH 20,21 . Importantly, fluxes of terrestrial carbon have been altered on decadal scales due to the impact of climate change on hydrological cycles 22 , and the anthropogenic impact on both river flow regimes (i.e., damming and irrigation) 23 and changing land uses 24,25 .…”

Section: Multiple Local Drivers Of Decadal Changes In Seawater Ph In ...mentioning

confidence: 99%

“…Here, we provide some examples of linkages between pH and its direct and indirect association with SDGs 2, 6, 12, 13, 14, 15, and 17 (Table 1). For instance, Target 2.4.1. of SDG 2, which addresses sustainable agriculture and improvement of land and soil quality, might have direct consequences on changing land uses and nutrient loading in watersheds and, therefore, on coastal pH 15,[18][19][20][21] . SDG 6 indicators linked with improving water quality through pollution reduction and protecting and restoring water-related ecosystems (e.g., rivers) also have direct effects on nutrient loading, eutrophication, and coastal pH trends 15,17,18 (Table 1A).…”

Section: Linking Different Sdgs With Drivers Of Coastal Acidificationmentioning

confidence: 99%

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Integrated actions across multiple sustainable development goals (SDGs) can help address coastal ocean acidification

Vargas,

Gelcich

2024

Commun Earth Environ

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The Sustainable Development Goals (SDGs) adopted by the United Nations in 2015 constitute a set of 17 global goals established as a blueprint for achieving a more sustainable and equitable world for humanity. As part of the SDGs, target 14.3 is focuses on minimizing and addressing the impacts of Ocean Acidification (OA). We argue that moving forward in meeting the targets related to pH levels in the coastal ocean can be facilitated through accounting for various drivers of pH change, which are associated with advancing a suite of SDG goals. Addressing ‘coastal acidification’ via a suite of linked SDGs may help avoid inaction through connecting global phenomena with local impacts and drivers. This in turn can provide opportunities for designing novel place-based actions or partnerships that can aid and provide synergies for the joint implementation of programs and policies that tackle a suite of SDGs and the specific targets related to coastal ocean pH.

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Section: Multiple Local Drivers Of Decadal Changes In Seawater Ph In ...mentioning

confidence: 99%

Section: Linking Different Sdgs With Drivers Of Coastal Acidificationmentioning

confidence: 99%

Integrated actions across multiple sustainable development goals (SDGs) can help address coastal ocean acidification

Vargas,

Gelcich

2024

Commun Earth Environ

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“…Photobleaching, sedimentation, mineralization, flocculation etc. become the controlling factors on the outset from particulate materials to large molecules and small ones, and eventually inorganic compounds in spring [60]. DOC in autumn and winter in Duliujian River was predicted negatively by agricultural land use, which was mainly sourced from microbial metabolites.…”

Section: The Impact Of Land-use Types On Dom In Watershedmentioning

confidence: 99%

Characteristics of Dissolved Organic Matter Impacted by Different Land Use in Haihe River Watershed, China

Chen

Wen

Xiao

et al. 2023

IJERPH

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It is important to explore characteristics of dissolved organic matter (DOM) in the riverine system due to its critical role in the carbon cycle. This study investigated the distribution characteristics and sources of DOM based on excitation emission matrix three-dimensional fluorescence technology and parallel factor (EEM-PARAFAC) analysis at two rivers in northern China strongly impacted by human activities. The results show that the fluorescence intensity of terrestrial humic-like substances increased during summer in Haihe River. The intensity was significantly higher than in spring due to terrestrial detritus from runoff conveyance. The fluorescence intensity of protein-like substances in spring was the highest and decreased in summer. This feature of DOM in the Duliujian River was related to the increase in precipitation and surface runoff in the wet season and the rapid degradation of mixed DOM in the dry season. An analysis of HIX, BIX and FI showed a low degree of DOM humification and more endogenous contributions from microbial and phytoplankton degradation. Seasonal variations of dissolved organic carbon (DOC) and chromophoric DOM (CDOM, a335, thereinto C1) suggest that chromophores, particularly terrestrial substances, regulate the temporal patterns of DOM in the two rivers. Combined with the analysis of the proportion of land use types in riparian buffers, tillage had a great impact on DOM content and hydrophobicity in Haihe River watershed. Domestic wastewater and industrial sewage discharge contribute more DOM to Duliujian River watershed, which was indicated by more abundant protein-like components (212.17 ± 94.63 QSU in Duliujian River;186.59 ± 238.72 QSU in Haihe River). This study highlights that different land use types resulted in distinctive sources and seasonal dynamics of DOM in rivers. Meanwhile, it should be considered that the estimation of carbon cycling should involve monitoring and evaluating anthropogenic inputs into rivers.

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“…In addition to climatic factors, marine ecosystems have also been affected by changes to the quality and quantity of terrestrially derived organic inputs (Felgate et al 2021 , Curra-Sánchez et al 2022 ). Terrestrially derived dissolved organic matter (tDOM) mainly enters the marine environment via underwater cave systems or river runoff and is found in greater concentrations near coastal ecosystems (Esham et al 2000 ).…”

Section: Introductionmentioning

confidence: 99%

Impacts of humic substances, elevated temperature, and UVB radiation on bacterial communities of the marine sponge Chondrilla sp

Stuij,

Cleary,

Rocha

et al. 2024

FEMS Microbiology Ecology

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Sponges are abundant components of coral reefs known for their filtration capabilities and intricate interactions with microbes. They play a crucial role in maintaining the ecological balance of coral reefs. Humic substances (HS) affect bacterial communities across terrestrial, freshwater, and marine ecosystems. However, the specific effects of HS on sponge-associated microbial symbionts have largely been neglected. Here, we used a randomized-controlled microcosm setup to investigate the independent and interactive effects of HS, elevated temperature, and UVB radiation on bacterial communities associated with the sponge Chondrilla sp. Our results indicated the presence of a core bacterial community consisting of relatively abundant members, apparently resilient to the tested environmental perturbations, alongside a variable bacterial community. Elevated temperature positively affected the relative abundances of ASVs related to Planctomycetales and members of the families Pseudohongiellaceae and Hyphomonadaceae. HS increased the relative abundances of several ASVspotentially involved in recalcitrant organic matter degradation (e.g. the BD2-11 terrestrial group, Saccharimonadales, and SAR202 clade). There was no significant independent effect of UVB and no significant interactive effects of HS, Heat and UVB on bacterial diversity and composition. The significant, independent impact of HS on the composition of sponge bacterial communities suggests that alterations to HS inputs may have cascading effects on adjacent marine ecosystems.

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Contrasting land-uses in two small river basins impact the colored dissolved organic matter concentration and carbonate system along a river-coastal ocean continuum

Cited by 18 publications

References 127 publications

Integrated actions across multiple sustainable development goals (SDGs) can help address coastal ocean acidification

Integrated actions across multiple sustainable development goals (SDGs) can help address coastal ocean acidification

Characteristics of Dissolved Organic Matter Impacted by Different Land Use in Haihe River Watershed, China

Impacts of humic substances, elevated temperature, and UVB radiation on bacterial communities of the marine sponge Chondrilla sp

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