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    The perception of the impacts of climate change in communities surrounding Lake Titicaca, Peru-Bolivia.
    (Faculty of 1000, 2026-05-26)
    <ns3:p> Background Climate change is increasingly transforming socio-ecological systems in high-Andean regions, particularly in communities surrounding Lake Titicaca, where livelihoods depend heavily on climate-sensitive activities such as agriculture, fisheries, livestock, and tourism. Despite growing environmental pressures, limited evidence exists regarding how local populations and institutional actors perceive climate-related impacts and adaptive responses in this transboundary region. This study analyzes climate change perceptions, perceived impacts, and adaptation capacities in communities located in Puno Bay (Peru) and Cohana Bay (Bolivia). Methods A mixed-methods approach integrating quantitative and qualitative techniques was applied during fieldwork conducted in November 2024 and June 2025 in the communities of Quehuaya, Capachica, Guaqui, and Puno. Data collection included structured surveys administered to 62 community members and 26 institutional actors, semi-structured interviews, participatory workshops, and participatory mapping exercises. Descriptive statistics, chi-square tests, and Spearman correlations were used for exploratory quantitative analysis, while qualitative information was analyzed through thematic coding and socio-ecological interpretation. Results Findings revealed high levels of climate change awareness among community members (85.5%) and institutional actors (100%). Respondents identified reduced rainfall, increasing temperatures, hydrological variability, declining agricultural productivity, reduced fish availability, and tourism-related impacts as the principal perceived effects. Significant differences were identified regarding adaptation measures (χ <ns3:sup>2</ns3:sup> = 14.96, p &lt; 0.001) and institutional support (χ <ns3:sup>2</ns3:sup> = 18.32, p &lt; 0.001), evidencing structural inequalities in adaptive capacity. A moderate positive correlation (ρ = 0.36, p = 0.003) was observed between climate perception and reported impacts. Conclusions Climate change is widely recognized across Lake Titicaca communities; however, adaptive capacity remains uneven due to disparities in institutional support, resources, and technical knowledge. Strengthening multi-level governance, participatory adaptation strategies, and transboundary cooperation is essential for improving resilience in Andean socio-ecological systems. </ns3:p>
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    Comparative study of iron and trace element mobilization during Fe-oxide bioreduction in mine tailings: a case study of Ensenada Chapaco (Chile) and Portman Bay (Spain): Bioreduction and metal release in mine-tailings
    (Universitat de Barcelona, 2025-01-01)
    elements (e.g. Ti, Ni, Cd, Pb), leading to contamination of the marine environment. Sea-Tailings Disposal (STD) along the northern coast of Chile (Ensenada Chapaco) and along the eastern coast of Spain (Portman Bay) results in an adverse impact on the environment. This paper focuses on bioreduction under marine conditions. To this end, two column experiments were carried out with samples from Portman Bay and Ensenada Chapaco. Lactate (i.e. organic matter source) was supplied during the experiments. The results obtained are compared with those from batch experiments performed under similar conditions.In the column filled with Portman Bay tailings, the high content of magnetite (15wt%) in contact with water gives rise to a large magnetite surface area and abundant Fe(III), which results in a high release of Fe(II) and Trace Elements (TE). Since Fe(II) adsorbs onto the magnetite surface reducing the availability of Fe(III), the magnetite bioreduction and the consequent TE release decrease after 2000h. By contrast, the magnetite bioreduction lasts longer (3000h) in the column with Ensenada Chapaco tailings. This is because a lower magnetite content in the tailings (1wt%) provides a smaller reactive surface area yielding less Fe(III). Consequently, the concentrations of Fe(II) and TE in the output solutions are lower, which slows down the Fe(II) adsorption onto magnetite. This results in a longer magnetite bioreduction. Bioreduction is regulated by the availability of Fe(III) in both columns.It is inferred that the bioreduction rate diminishes as a function of time and increases as a function of soluble Fe(II) concentration. Moreover, the concentrations of TE released from the two bioreduced tailings exceed the elemental concentrations under marine conditions.
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