Relationships between stomach content and concentrations of essential and non-essential elements in tissues of omnivorous nestling rooks Corvus frugilegus: Is the size and composition of stomach content relevant?

Title:

Relationships between stomach content and concentrations of essential and non-essential elements in tissues of omnivorous nestling rooks Corvus frugilegus: Is the size and composition of stomach content relevant?

Creator:

Orłowski, Grzegorz, Kamiński, Piotr, Kasprzykowski, Zbigniew, and Zawada, Zbigniew

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:eb3e338e-acaa-4919-9c5a-f892d94fa13b
uuid:eb3e338e-acaa-4919-9c5a-f892d94fa13b

Subject:

non-essential metals, lead, cadmium, soil-invertebrate feeding birds, and bird diet

Type:

article, model:article, and TEXT

Description:

Soil-invertebrate feeding birds can be exposed to high doses of toxic metals trough their diet. Recently, we have shown that nestling rooks Corvus frugilegus from several rookeries in Poland have a cadmium (Cd) tissue level diagnostic for acute contamination as well as an elevated level of lead (Pb). To explain the potential pathway of bioaccumulation of 11 essential and non-essential elements, including two metals of primary concern (Cd and Pb), in target issues of these nestlings, we analyzed the relationships between the dietary characteristics of stomach content (mass of digesta, number of cereal grains, plant and animal items, and grit particles) and concentrations of metals in the liver, kidneys, lung, muscles and bones. Our analysis showed in total 17 (8 negative and 9 positive) statistically signigicant relationships between the five analyzed dietary characteristics of stomach content nad concentrations of metals in the liver, kidneys, muscles and bones. We found a significant positive relationship between the number of animal food items and Cd-level in kidneys; and a negative relationship bewteen the number of plant items and Pb-level in the liver, and between the number of grit particles and Pb-level in kidneys. Despite the limitations of our study due to the different degree of digestion of some food items, our findings suggest high bioavailability of Cd from animal food items and a low level or reduce gastrointestinal absorption of Pb from plant food (mainly cereals). We urge further research on absorption of Cd and Pb from different dietary components and application of diet analysis to explain the complex nature of bioaccumulation of anthropogenic contaminants in the internal organs and tissues of birds and other species of animals, especially in species with a mixed plant-animal diet.

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Folia zoologica | 2013 Volume:62 | Number:4

Harvested from:

CDK

Metadata only:

false