Organochlorines in Eggs and Food Organisms of Avocets ( Recurvirostra avosetta )

Dietrich, Sylvia; Büthe, Annegret; Denker, Eckhard; Hötker, Hermann

doi:10.1007/s001289900323

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…While we found some differences between the waterbird species, these were not completely congruent with their feeding habits and habitat use. In spite of the terrestrial feeding habit of A. anser, the number of OTUs transported by them was largely comparable to those found in shorebirds, C. pugnax and R. avosetta, which prefer to feed in the shallow shoreline regions of ponds (Baccetti et al, 1998;Dietrich et al, 1997) and may directly consume biofilm communities as shown for multiple Calidris spp. (Kuwae et al, 2008(Kuwae et al, , 2012.…”

Section: Discussionmentioning

confidence: 62%

Microbial stowaways – waterbirds as dispersal vectors of aquatic pro- and microeukaryotic communities

Szabó

Vad

Boros

et al. 2021

Preprint

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Aim: Waterbirds are important dispersal vectors of multicellular organisms such as macrophytes, aquatic macroinvertebrates, and zooplankton. However, no study to date has focused on their potential role in dispersing aquatic microbial communities. Here, we carried out the first explicit study on passive transport (endozoochory) of prokaryotes and unicellular microeukaryotes by waterbirds based on a metagenomic approach. By directly comparing the dispersed set of organisms to the source pool of a natural metacommunity, we aimed for a realistic estimate of the overall importance of waterbird zoochory for natural microbial communities. Location: Seewinkel region of Austria and Hungary. Taxon: Prokaryotes and unicellular microeukaryotes. Methods: In 2017 and 2018, water samples from natural aquatic habitats along with fresh droppings of the dominant greylag goose (Anser anser) and four other waterbird species were collected in a well-delineated habitat network of temporary saline ponds (soda pans). Their prokaryotic and microeukaryotic communities were identified via 16S and 18S rRNA gene amplicon sequencing and compared across years and waterbird species. Results: We found that up to 40% of the dominant aquatic microbial OTUs were transported by A. anser. OTU richness in A. anser droppings was lower, but compositional variation was higher compared to the aquatic communities, probably resulting from stochastic pick-up of microbes from multiple aquatic habitats. We furthermore found that prokaryote species composition of bird droppings followed the interannual turnover in the aquatic communities. Finally, we found species-specific differences among different waterbird species. Among them, the planktivore filter-feeder northern shovelers (Anas clypeata) collected and dispersed a more species-rich subset of microeukaryotes than shorebirds or geese. Main conclusions: Overall, our study provides the first quantitative empirical evidence of endozoochory in natural microorganism communities. These results imply that waterbirds may be crucial in maintaining ecological connectivity between discrete aquatic habitats at the level of microbial communities. Keywords: aquatic microorganisms, bacteria, connectivity, dispersal, endozoochory, phytoplankton, protists, waterbirds

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Section: Discussionmentioning

confidence: 62%

Microbial stowaways – waterbirds as dispersal vectors of aquatic pro- and microeukaryotic communities

Szabó

Vad

Boros

et al. 2021

Preprint

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“…Die Rangfolge der Kontamination der Vogelarten la Èsst sich teilweise durch die Nahrungspra Èferenz und das Zugverhalten erkla Èren (Becker et al 1991). Die interspezifischen Unterschiede zwischen den Vogelarten sind vermutlich weniger deutlich, weil auch die Unterschiede in der Kontamination der Nahrungsorganismen (Mattig et al 1997 Dietrich et al 1997). Diese Tendenz ist auch in den vorliegenden Daten ersichtlich.…”

Section: Das Ergebnis Stimmt Mit Langzeitlichen Trenduntersuchungen Zunclassified

Umweltchemikalien in Eiern des Alpenstrandläufers (Calidris alpina) aus Nordnorwegen im Vergleich zu Eiern von Brutvogelarten des Wattenmeeres

Mattig¹

2000

J Ornithol

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Summary Environmental chemicals in eggs of Dunlins (Calidris alpina) from Northern Norway compared to eggs of coastal bird species breeding in the Wadden Sea Owing to the international importance of the Wadden Sea for waders and waterfowl a long‐term program to monitor chemical contamination of birds breeding in the Wadden Sea has been established in the early 1980s with Oystercatcher (Haematopus ostralegus) and Common Tern (Sterna hirundo) as monitor species. However, numbers of birds breeding in the area are only 10 % compared to numbers of birds using it as a wintering, moulting or staging area, and little is known about contamination of those non‐breeding birds. In 1993 we compared contamination levels in eggs from eight species (Shelduck Tadorna tadorna; Eider Somateria mollissima; Oystercatcher; Avocet Recurvirostra avosetta; Redshank Tringa totanus; Black‐headed Gull Larus ridibundus; Herring Gull Larus argentatus; Common Tern) breeding at the island of Spiekeroog (German Wadden Sea) with those from Dunlins (Calidris alpina alpina) breeding in Northern Norway (Gamvik). It is known that many Dunlin from this area use the German Wadden Sea for staging. We analyzed contaminant levels of 21 industrial chemicals (PCBs, HCB, Moschusxylol, Octachlorstyrol, Mercury) and biocides (DDT and metabolites, HCH‐Isomers, Bromocyclen). Common Tern and Herring Gull eggs reached highest Σ‐PCB levels whereas mercury had the highest concentrations in eggs of Eider, Oystercatcher and Common Tern as well as Σ‐DDT in eggs of Black‐headed Gull. Bromocyclen could not be detected in eggs of the breeding species, whereas Moschusxylol was found in 29 % of the eggs and Octachlorostyrol in 57 %. Contaminant levels were in most cases above the levels given by German law for eggs used for human food but are probably not high enough to show an effect on the breeding success of the different species. In comparison to these results contaminant levels in eggs of Dunlins from Northern Norway were low and showed a similar chemical pattern as for migrating waders breeding in the Wadden Sea detected. For the first time Bromocyclen residues could be detected in bird eggs.

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“…Mit der Entwicklung und damit verbundenen Verbesserung von Untersuchungsmethoden sowie der Verfügbarkeit von Probenmaterial sind Weihen wie die Rohr‐ und Wiesenweihe aber durchaus interessante Untersuchungsziele gerade in Bezug auf die Aufnahme von Schadstoffen über die Nahrungstiere. Wie sich Schadstoffgemische in der Nahrungskette durch Metabolisations‐ und Anreicherungsprozesse verändern, zeigten verschiedene Untersuchungen (Denker 1996, Dietrich et al. 1997).…”

Section: Introductionunclassified

Veranderungen in der Zusammensetzung der PCB- und DDT-Gemische in verschiedenen Lebensstadien der Wiesenweihe (Circus pygargus) und der Rohrweihe (Circus aeruginosus) in Nordrhein-Westfalen, Deutschland.

Denker

Büthe

Glimm³

et al. 2003

J f?r Ornithologie

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Summary Changes in the DDT and PCB burden in life stages of Montagu's (Circus pygargus) and MarshHarriers (Circus aeruginosus) from North-Rhine Westfalia, GermanyEgg and liver samples of Montagu's and Marsh Harriers from the 1990's were examined for their burden of DDT and PCB. The DDT burden in both species was distinctly higher in the eggs than in juveniles and adults, whereby the values for the adults were clearly higher than those for the juveniles. The composition of the DDT isomers of both species varies between the life stages. In the egg samples nearly only p,p'-DDE was found, while in the livers of the adults and more especially of the juveniles higher parts of p,p'-DDT were detected. In both species the PCB burden of the eggs and of the adults was clearly higher than that of the juveniles. The composition of the PCB mixtures of both species differed distinctly between each of the life stages. While the PCB mixtures in eggs and in the livers of adults are nearly identical, in the livers of juveniles a distinct shift to lower chlorinated congeners reaching higher parts of the PCB mixtures becomes evident. The changes in the composition of DDT and PCB mixtures in the different life stages reflect a new uptake of these xenobiotics with the food animals.

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Organochlorines in Eggs and Food Organisms of Avocets ( Recurvirostra avosetta )

Cited by 10 publications

References 12 publications

Microbial stowaways – waterbirds as dispersal vectors of aquatic pro- and microeukaryotic communities

Microbial stowaways – waterbirds as dispersal vectors of aquatic pro- and microeukaryotic communities

Umweltchemikalien in Eiern des Alpenstrandläufers (Calidris alpina) aus Nordnorwegen im Vergleich zu Eiern von Brutvogelarten des Wattenmeeres

Veranderungen in der Zusammensetzung der PCB- und DDT-Gemische in verschiedenen Lebensstadien der Wiesenweihe (Circus pygargus) und der Rohrweihe (Circus aeruginosus) in Nordrhein-Westfalen, Deutschland.

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