In order to empower the field of biogeochemistry further in its capacity to inform and influence social transitions, the authors make a strong plea to further strengthen the integrative nature of biogeochemistry. They put special attention to the integration of mechanisms, including both the molecular and eco-evolutionary perspectives, and insights from the social sciences.
Diversity and community composition of bacteria along vertical gradients were studied in Lake Issyk Kul, Kyrgyzstan, the 6th deepest lake worldwide and the largest high-altitude lake. In the molecular assessment, the 16S rRNA gene analysis revealed significant changes in the composition, responding mainly to depth and salinity with Planctomycetes and Chloroflexi dominating in the deepest layers.
A review of hydropower plants in Romania: distribution, current knowledge, and their effects on fish in headwater streams
Hydropower is renewable, but mostly not environmentally friendly. The study shows for Romania how the expansion of hydropower runs counter to the goals of EU environmental policy. Hydropower conflicts with the requirements of the Flora-Fauna-Habitat Directive and the European Water Framework Directive: around half of the hydropower plants in Romania are located in nature conservation areas.
The authors investigated the recovery of a small, temperate shallow lake from a strong flooding-induced browning and nutrient loading event. Concentrations of dissolved organic carbon and phosphorus remained elevated and affected primary production despite water levels dropping to pre-flood levels indicating consequences of extreme precipitation for lake water quality and aquatic food webs.
Using isotopes to understand landscape‐scale connectivity in a groundwater‐dominated, lowland catchment under drought conditions
The authors integrated hydrometric and isotope data to understand how droughts affect ecohydrological partitioning, hydrological connectivity and streamflow generation at the catchment scale. Groundwater recharge was lower under forest than grassland and enhanced in restored wetlands. Complex patterns of connectivity affect in-stream solute transport and interactions between land- and riverscapes.
Exploring the suitability of ecosystem metabolomes to assess imprints of brownification and nutrient enrichment on lakes
In the Lake Stechlin Lake Lab facility, the researchers tested whether dissolved molecules retain information about past and present alterations of lakes. They found that UV or microbial activities left measurable imprints on dissolved compounds, emphasising the relevance of the "ecosystem metabolome" to monitor the functioning and quality of lakes.
Alien birds can have severe impacts on native birds. The authors wanted to find out whether there are certain factors that make some native bird species more vulnerable to such impacts than others. They identified several factors that increase vulnerability, as well as specific orders of native birds that may require protection, and locations where impacts may be particularly damaging.
Disentangling the direct and indirect effects of agricultural runoff on freshwater ecosystems subject to global warming: a microcosm study
Microcosm experiments were performed to disentangle the direct and indirect effects of agricultural runoff (ARO) combined with warming on primary producers and their consumers in freshwaters. Negative effects of ARO on snail grazers affected the balance between functional groups of primary producers leading to a dominance of periphyton.The effect was enhanced when ARO arrived in multiple pulses.
A bright spot analysis of inland recreational fisheries in the face of climate change: learning about adaptation from small successes
The review study highlights examples of “bright spots” to show that a positive future for inland recreational fisheries in the face of climate change is possible. The authors present potential strategies (e.g. community-based or transdisciplinary restoration projects, adaptive approaches to short-term fisheries interventions) to adapt to current and future climate scenarios.
Technological innovations in the recreational fishing sector: implications for fisheries management and policy
The authors have summarized how technical innovations can affect anglers, fisheries management and fish populations. They advise to increasingly study the effects of fishing innovations and adjusting management measures as necessary.