Hatching under brownification: DOC-mediated changes in physical, but not chemical properties of water affect hatching patterns of Cladocera resting eggs

Vargas, Anderson L.; Santangelo, Jayme M.; Bozelli, Reinaldo Luiz

doi:10.1007/s11356-022-19864-x

Cited by 5 publications

(3 citation statements)

References 56 publications

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“…Brownification has been found to have negative effects on aquatic invertebrate numbers and species composition at boreal lakes (Arzel et al., 2020 ). The causation behind the phenomenon is not clear, but light attenuation due to brownification has been observed to have a negative impact on water flea reproduction (Vargas et al., 2022 ). In boreal waters, brownification development might be detrimental for ducks, as food has been observed to limit the survival of mallard ducklings on boreal lakes (Gunnarsson et al., 2004 ).…”

Section: Discussionmentioning

confidence: 99%

“…This is because physico‐chemical quality elements, such as light, acidification, and nutrient conditions, are expected to support the biological quality elements, such as phytoplankton, benthic invertebrates and macrophytes, of the wetlands (Kristensen et al., 2018). Bottom‐up effects are versatile: for example, brownification (a result of increased levels of DOC/TOC) of the water together with decreasing water clarity in lakes affects the light conditions and productivity of lakes (Blanchet et al., 2022; Karlsson et al., 2009; Seekell et al., 2015) and may be accompanied by a progressive loss of aquatic macrophytes (Choudhury et al., 2019; Reitsema et al., 2018; Sand‐Jensen et al., 2008), invertebrates (Arzel et al., 2020; Vargas et al., 2022) and fish (Karlsson et al., 2009). Eutrophic boreal lakes, in particular, have become darker and more turbid during the last decades (de Wit et al., 2016; Holopainen & Lehikoinen, 2022), which may have negatively impacted populations at higher trophic levels (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Anthropogenic bottom‐up and top‐down impacts on boreal breeding waterbirds

Holopainen,

Jaatinen,

Laaksonen

et al. 2024

Ecology and Evolution

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Wetland habitats are changing under multiple anthropogenic pressures. Nutrient leakage and pollution modify physico‐chemical state of wetlands and affect the ecosystem through bottom‐up processes, while alien predators affect the ecosystems in a top‐down manner. Boreal wetlands are important breeding areas for several waterbird species, the abundances of which potentially reflect both bottom‐up and top‐down ecosystem processes. Here, we use long‐term national monitoring data gathered from c. 130 waterbird breeding sites in Finland from the 1980s to the 2020s. We hypothesised that the physico‐chemical state of the waters and increasing alien predator abundance both play a role in steering the waterbird population trends. We set out to test this hypothesis by relating population changes of 17 waterbird species to changes in water chemistry and to regional alien predator indices while allowing species‐specific effects to vary with foraging niche (dabblers, invertivore divers, piscivorous divers, herbivores), nesting site, female mass and habitat (oligotrophic, eutrophic). We found niche and nesting site‐specific, habitat‐dependent changes in waterbird numbers. While the associations with higher phosphorus levels and browning water were in overall positive at the oligotrophic lakes, the numbers of invertivore and piscivore diving ducks were most strongly negatively associated with higher phosphorus levels and browning water at the eutrophic lakes. Furthermore, increased pH levels benefitted piscivores. Invertivore diving duck species nesting on the wetlands had declined most on sites with high alien predator indices. Large herbivorous species and species preferring oligotrophic lakes seem to be successful. We conclude that the large‐scale breeding waterbird decline in Finland is closely connected to both bottom‐up and top‐down processes, where negative associations are emphasised especially at eutrophic lakes. Niche‐, nest site‐ and habitat‐specific management actions are required to conserve declining waterbird populations. Managing wetlands on catchments level together with alien predator control may provide important approaches to future wetland management.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anthropogenic bottom‐up and top‐down impacts on boreal breeding waterbirds

Holopainen,

Jaatinen,

Laaksonen

et al. 2024

Ecology and Evolution

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“…Semi‐permanent basin wetlands and reservoirs, on the other hand, have hydrologies that encourage the growth of submerged aquatic vegetation (SAV), which provide growth and reproduction substrates for macroinvertebrates (Batzer, 2013; Bauer et al., 2020; Fredrickson & Reed, 1988; Hagy et al., 2011; Schad et al., 2020). Further research on both the physical and chemical properties of working wetlands and how they might further impact patterns of invertebrate distribution are warranted (Arzel et al., 2020; Kantrud, 1986; Longcore et al., 2006; Swanson et al., 1988; Vargas et al., 2022; Vest et al., 2023).…”

Section: Discussionmentioning

confidence: 99%

Riding the wetland wave: Can ducks locate macroinvertebrate resources across the breeding season?

Setash,

Behney,

Gammonley

et al. 2024

Ecology and Evolution

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Food availability varies considerably over space and time in wetland systems, and consumers must be able to track those changes during energetically‐demanding points in the life cycle like breeding. Resource tracking has been studied frequently among herbivores, but receives less attention among consumers of macroinvertebrates. We evaluated the change in resource availability across habitat types and time and the simultaneous density of waterfowl consumers throughout their breeding season in a high‐elevation, flood‐irrigated system. We also assessed whether the macroinvertebrate resource density better predicted waterfowl density across habitats, compared to consistency (i.e., temporal evenness) of the invertebrate resource or taxonomic richness. Resource density varied marginally across wetland types but was highest in basin wetlands (i.e., ponds) and peaked early in the breeding season, whereas it remained relatively low and stable in other wetland habitats. Breeding duck density was positively related to resource density, more so than temporal resource stability, for all species. Resource density was negatively related to duckling density, however. These results have the potential to not only elucidate mechanisms of habitat selection among breeding ducks in flood‐irrigated landscapes but also suggest there is not a consequential trade‐off to selecting wetland sites based on energy density versus temporal resource stability and that good‐quality wetland sites provide both.

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