Aminolevulinic acid dehydratase activity in American dippers (<i>Cinclus mexicanus</i>) from a metal‐impacted stream

Strom, Sean M.; Ramsdell, Howard S.; Archuleta, Andrew S.

doi:10.1002/etc.5620210117

Cited by 19 publications

(9 citation statements)

References 24 publications

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“…, 1996; Sorace et al. , 2002) and North America (Strom et al. , 2002; Feck & Hall, 2004; Henny et al.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, these effects on dippers are so well defined that they have been widely proposed as indicator species in the monitoring and management of lotic systems (Sorace et al. , 2002; Strom, Ramsdell & Archuleta, 2002; Feck & Hall, 2004). However, such studies on the population dynamics and distribution of dippers rarely consider the effect of flooding (but see Price & Bock, 1983), which can be a major disturbance in river systems.…”

Section: Introductionmentioning

confidence: 99%

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Effects of flooding on avian top‐predators and their invertebrate prey in a monsoonal Taiwan stream

et al. 2008

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1. The effects of flooding on top predators are poorly understood globally, but particularly in monsoonal streams. We therefore attempted to assess how inter-annual and intra-annual variations in flood magnitude affected an obligate riverine predator, the brown dipper (Cinclus pallasii), and its invertebrate prey, in the mountain Tachia River, Taiwan. Major flooding in one of the study years (2005) allowed an insight into the effects of abnormally large flows. 2. The abundance and biomass of insects, and the abundance of dippers, decreased steadily from 2003 to 2005 as flood magnitude grew, but then increased in 2006 when more typical discharge returned. Dipper abundance, insect abundance and insect biomass were all strongly positively inter-related, but negatively related to discharge. Insect biomass, rather than abundance, was more useful in predicting brown dipper abundance. 3. Aquatic insect composition fluctuated among sampling years, revealed by non-metric multidimensional scaling, and these fluctuations were also related to discharge. In turn, dipper abundance and the mean body size of aquatic insects declined with the shift in insect composition as flow increased. 4. These data illustrate how discharge fluctuations can have pronounced effects on top predators in streams, mediated in this case by fluctuating prey abundance. While contributions from bird movement, breeding performance and mortality were not clearly differentiated, our data reveal how dippers have strategies to accommodate varying discharge in river systems. We suggest that the effects of floods on dippers should be taken into account when using this group as indicators of river quality

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“…, 1996; Sorace et al. , 2002) and North America (Strom et al. , 2002; Feck & Hall, 2004; Henny et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of flooding on avian top‐predators and their invertebrate prey in a monsoonal Taiwan stream

et al. 2008

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“…Therefore, predators feeding on metal‐ contaminated biota, including the dipper, are at risk for elevated exposure from its aquatic diet. Strom et al [8] confirmed adult and nestling American dippers were exposed to lead through their invertebrate prey in a mine‐impacted river system. Therefore, dippers can be an effective model for monitoring metal pollution in mountain streams because they integrate contaminant sources from their aquatic diet over time and space.…”

Section: Introductionmentioning

confidence: 99%

Assessing trace-metal exposure to American dippers in mountain streams of southwestern British Columbia, Canada

Morrissey

Bscendell‐Young

Elliott

2005

Environmental Toxicology and Chemistry

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To develop a suitable biomonitor of metal pollution in watersheds, we examined trends in exposure to nine trace elements in the diet (benthic invertebrates and fish), feathers (n = 104), and feces (n = 14) of an aquatic passerine, the American dipper (Cinclus mexicanus), from the Chilliwack watershed in British Columbia, Canada. We hypothesized that key differences may exist in exposure to metals for resident dippers that occupy the main river year-round and altitudinal migrants that breed on higher elevation tributaries because of differences in prey metal levels between locations or possible differences in diet composition. Metals most commonly detected in dipper feather samples in decreasing order were Zn > Cu > Hg > Se > Pb > Mn > Cd > Al > As. Resident dipper feathers contained significantly higher mean concentrations of mercury (0.64 microg/g dry wt), cadmium (0.19 microg/g dry wt), and copper (10.8 microg/g dry wt) relative to migrants. Mass balance models used to predict daily metal exposure for dippers with different diets and breeding locations within a watershed showed that variation in metal levels primarily was attributed to differences in the proportion of fish and invertebrates in the diet of residents and migrants. In comparing predicted metal exposure values to tolerable daily intakes (TDI), we found that most metals were below or within the range of TDI, except selenium, aluminum, and zinc. Other metals, such as cadmium, copper, and arsenic, were only of concern for dippers mainly feeding on insects; mercury was only of concern for dippers consuming high fish diets. The models were useful tools to demonstrate how shifts in diet and breeding location within a single watershed can result in changes in exposure that may be of toxicological significance.

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“…The aquatic songbird American dipper Cinclus mexicanus (American Ornithologists’ Union 1998) occupies mountainous watersheds year‐round and has proven useful as a biomonitor of metal pollution (Strom, Ramsdell & Archuleta 2002). The Eurasian dipper Cinclus cinclus L. has also been shown to be a useful indicator of organochlorine (OC), polychlorinated biphenyl (PCB) and mercury (Hg) pollution in upland river catchments (Ormerod & Tyler 1990, 1992; O’Halloran et al .…”

Section: Introductionmentioning

confidence: 99%

Linking contaminant profiles to the diet and breeding location of American dippers using stable isotopes

Morrissey

Bendell-Young

Elliott

2004

Journal of Applied Ecology

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Summary1. Individual variation in contaminant levels is a common occurrence in many toxicology studies, but the exact cause is often unclear. We investigated the influence of diet and breeding location on individual bird contaminant profiles using a colour-marked population of American dippers Cinclus mexicanus . The population comprised two distinct groups within a single river system: resident dippers breeding on the main river and altitudinal migrants breeding on tributaries. 2. Residue analysis revealed that total organochlorines (OC), polychlorinated biphenyls (PCB) and mercury (Hg) were all significantly higher in eggs from river residents compared with tributary migrants. This trend was also apparent for the three most prevalent organochlorine compounds: p , p ′ -dichlorodiphenyl-dichloroethylene (DDE), hexachlorobenzene and trans -nonachlor. 3. We hypothesized that the observed differences in contaminant concentrations were partially related to the proportion of salmon fry Oncorhynchus spp. in the diet relative to aquatic invertebrates. Stable isotope analyses using δ 13 C and δ 15 N were conducted on blood and feathers of dippers in addition to aquatic invertebrates and salmon fry prey. Linear mixing models using the 15 N isotope in the dippers' diet and blood revealed considerable variability in the proportion of fish consumed (0-71%). Resident dippers on the main river ate significantly higher proportions of fish (42%) than tributary migrants (22%) ( P = 0·01). 4. The difference in diet between migratory groups explained some of the observed variation in egg contaminant profiles, as total OC ( P = 0·002) in dipper eggs was positively correlated with blood δ 15 N values, indicating fish may be the primary source of contamination. 5. Synthesis and applications . We conclude that dipper eggs represent local conditions at the breeding site, making them useful tools for biomonitoring aquatic contaminants in watersheds. However, given the distinct difference in contaminant profiles between resident and migrant dippers and the link with diet, the results emphasize the importance of understanding individual species' ecology for assessing toxicological effects at the population level.

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Aminolevulinic acid dehydratase activity in American dippers (Cinclus mexicanus) from a metal‐impacted stream

Cited by 19 publications

References 24 publications

Effects of flooding on avian top‐predators and their invertebrate prey in a monsoonal Taiwan stream

Effects of flooding on avian top‐predators and their invertebrate prey in a monsoonal Taiwan stream

Assessing trace-metal exposure to American dippers in mountain streams of southwestern British Columbia, Canada

Linking contaminant profiles to the diet and breeding location of American dippers using stable isotopes

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