Differential mercury transfer in the aquatic food web of a double basined lake associated with selenium and habitat

Diurnal variability and biogeochemical reactivity of mercury species in an extreme high-altitude lake ecosystem of the Bolivian Altiplano

“…Interestingly, the relative proportion of dissolved MMHg (MMHg d ) was found extremely high, representing between 57±5 and 23±9 % at SS during the dry and wet season, respectively, with a maximum value of 64±8 % at NS during the wet season. This high-dissolved MMHg partition is probably the highest ever reported in high-altitude lake ecosystems, compared to the southern oligotrophic Moreno Lake (Patagonia, atl 768 m, 0.4 to 2.4 %, Arcagni et al 2013) -Bourgoin et al 2000), with the relative proportion of MMHg being significantly higher. DGM concentrations were mainly composed by 97.0 to 99.9 % of Hg°with only 0-3 % DMHg.…”

Distant drivers or local signals: Where do mercury trends in western Arctic belugas originate?

“…Conversely, no significant relationships were observed in the large size group. Thus, the often expected relationships between stable isotopes and Hg (Cabana and Rasmussen, 1994;Jardine et al, 2006) are not always evident (e.g., Arcagni et al, 2013;Bisi et al, 2012). The lack of a relationship in the larger animals between Hg and δ 15 N and δ 13 C may be attributed, at least in part, to what they prey on and the differences in how prey accumulate Hg relative to the δ 15 N and δ 13 C signals.…”

Drivers of biomagnification of Hg, As and Se in aquatic food webs: A review

“…However, this remains a subject of debate, controversy and research (Amlund et al, 2015;Bjerregaard et al, 2011;Bjerregaard and Christensen, 2012;Luo et al, 2020). Additionally, it has been suggested that the reductive effect may also be related to chemical characteristics, trophic structure, ecological processes (Arcagni et al, 2017) and specific detoxification mechanisms developed by some organisms in particular fish (Arcagni et al, 2013;Ikemoto et al, 2008). This study aimed to explore relevant factors J o u r n a l P r e -p r o o f 5 driving the biomagnification of Hg, As and Se in aquatic food webs.…”

“…In relation to factors influencing biomagnification, trophic structure and diet have been reported to be key factors that help to understand trophodynamics, accumulation and biomagnification along food webs (Arcagni et al, 2013;Schneider et al, 2015). Studies have indicated that in networks composed of plankton, algae, invertebrates, macrophytes and fish, Se only biomagnifies in fish and its biomagnification potential could be related to the complexity of the food web (Arcagni et al, 2013;Jasonsmith et al, 2008;Mann et al, 2011;Økelsrud et al, 2016). However, it has been expected that biomagnifying potential is more evident in freshwater lakes and depends on the species chemistry (Arcagni et al, 2013;Dang and Wang, 2011;Jardine et al, 2006;Schneider et al, 2015).…”

“…Studies have indicated that in networks composed of plankton, algae, invertebrates, macrophytes and fish, Se only biomagnifies in fish and its biomagnification potential could be related to the complexity of the food web (Arcagni et al, 2013;Jasonsmith et al, 2008;Mann et al, 2011;Økelsrud et al, 2016). However, it has been expected that biomagnifying potential is more evident in freshwater lakes and depends on the species chemistry (Arcagni et al, 2013;Dang and Wang, 2011;Jardine et al, 2006;Schneider et al, 2015). For example, in complex food webs (plankton, macroalgae, benthic microalgae, invertebrates, detritus, seagrasses, epiphytes and fish) from Lake Macquarie (New South Wales, Australia), Se concentrations ranged from 0.2 μg g -1 (macroalgae) to 12.9 μg g -1 in predatory fish and a mean magnification factor of 1.39 per trophic level, indicating a significant biomagnification.…”