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Dissolved humic substances – ecological driving forces from the individual to the ecosystem level?
TLDR
Evidence is presented that dissolved HS are indeed taken up and interact directly and/or indirectly with freshwater organisms, and that they exert a mild chemical stress upon aquatic organisms in many ways.
Tropical freshwater ecosystems have lower bacterial growth efficiency than temperate ones
TLDR
It is argued that higher temperature, nutrient limitation, and light exposure all contribute to lower BGE in the tropics, mediated through effects on thermodynamics, substrate stoichiometry, nutrient availability and interactions with photochemically produced compounds.
High taxonomic variability despite stable functional structure across microbial communities
TLDR
It is found that all of the bromeliads exhibited remarkably similar functional community structures, but that the taxonomic composition within individual functional groups was highly variable, and that non-neutral processes at least partly shaped the composition within functional groups and were more important than spatial dispersal limitation and demographic drift.
Dis­solved humic substances
DOC removal paradigms in highly humic aquatic ecosystems
TLDR
HS may be an important source of energy for aquatic bacteria in humic waters, but it is probably not as important as a substrate to bacterial growth and to aquatic food webs, since HS consumption is mostly channeled through microbial respiration.
Ecological determinism increases with organism size.
TLDR
It is concluded that a key niche process, habitat filtering, strengthened with organism size, possibly because larger organisms are both less plastic in their fundamental niches and more able to be selective in dispersal.
Natural dissolved humic substances increase the lifespan and promote transgenerational resistance to salt stress in the cladoceran Moina macrocopa
TLDR
HS at environmentally realistic concentrations, by acting as mild chemical stressors, modify crucial life-history traits of M. macrocopa, favoring its persistence in fluctuating environments.
Correlates of Zooplankton Beta Diversity in Tropical Lake Systems
TLDR
It is suggested that faunal exchange and disturbance play important roles in structuring local zooplankton communities by facilitating dispersal between habitats.
Influence of Hydrological Pulse on Bacterial Growth and DOC Uptake in a Clear-Water Amazonian Lake
TLDR
It is concluded that bacterial growth and DOC uptake vary throughout the flood pulse in clear-water Amazonian ecosystems as a result of changes in nutrient concentration and in DOC composition.
Seasonal changes of dissolved organic carbon photo-oxidation rates in a tropical humic lagoon: the role of rainfall as a major regulator
TLDR
Although dissolved organic carbon (DOC) concentration, water color, and sunlight incidence were generally higher in the rainy season, photo-oxidation rates were not significantly related to any of these parameters.
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