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Predation on artificial nests imitating the broods of two rallid species: the influence of habitat features

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Chibowski P., Brzezinski M., Jedlikowski J.
Polish Journal of Ecology
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2015
|
tom 63
|
nr 4
We tested the influence of nest concealment (vegetation type, density and height), water depth and nest distance from the bank on predation rates upon simulated nests of the water rail (Rallus aquaticus) and the little crake (Porzana parva). Broods of both rallids were simulated by real and wax-filled quail (Coturnix coturnix) eggs coloured typically for each species. Three grades of nest concealment were used: uncovered nests located on wooden floating boards, nests hidden in littoral vegetation and nests hidden under a plastic mesh covered with plants, which made them invisible from the air. Concealment proved to have a stronger impact on the fate of artificial nests than water depth; 95% of the nests on boards were depredated after one week of exposure. Nests attached to a peg at water level and hidden in vegetation had survival rates of 18 and 22%, after three weeks of exposure in two experiment repetitions. In 2012, we found significant differences between survival rates of nests located in different types of vegetation after the first week of the experiment: nests in bulrush (Typha spp.) had a higher survival rate than nests in sedge (Carex spp.) and common reed (Phragmites australis), and nests in sedge had a better survival rate than nests in reed. Those differences disappeared after the end of the experiment. In 2013, nests located in sedge (Carex spp.) had a better survival rate than nests located in bulrush (Typha spp.) or the common reed (Phragmites australis). Covering nests with plastic mesh and plants increased nest survival up to 38% after a three-week-long exposure period. Potential nest predators were monitored: mammals (mustelids and rodents) using live traps and birds by observation of their hunting activity. Filling quail eggshells with wax allowed us to identify the marsh harrier (Circus aeruginosus) as the main nest predator — in 67% of depredated nests, wax eggs carried marks of a raptor beak. American mink (Neovison vison) and the water vole (Arvicola amhibius), though abundant in the study area, were not important nest predators, as only a few bite marks of these mammals were recorded.
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Obrożowanie łysek Fulica atra w Warszawie w latach 2011-2021 jako metoda znakowania – doświadczenia, wnioski i przydatność tego rodzaju znacznika

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Matyjasiak L., Jedlikowski J., Mateuszczyk H.
Kulon
|
2022
|
tom 27
3
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Pierwsze stwierdzenie lęgu karliczki Zapornia pusilla w Polsce po ponad 160 latach

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Kolodziejczyk M., Mikusek R., Polak M., Jedlikowski J.
Ornis Polonica
|
2021
|
tom 62
|
nr 4
Between 24 May and 5 June 2021 on a flooded meadow in Lublin District we recorded several times calls of three males of the Baillon’s Crake Zapornia pusilla. After having applied a playback stimulation one male approached the loudspeaker and was observed. Between 6 and 19 June we placed several camera traps in the area, and they took 25 photos of the species. On 20 June we found a nest of the Baillon’s Crake containing 8 eggs at the final stage of incubation. During the next visit on 6 July we found one (probably unfertilised) egg and tiny eggshells fragments. The nest platform was well trodden indicating the presence of birds and nest success. The Baillon’s Crake has been absent as a breeding bird in Poland for more than 160 years, and our observation is the first documented breeding record of the species since then.
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