The Influence of Nest Density on Nest Predation in Olive Groves Depends on Habitat Features

Carpio, Antonio J.; Castro-Caro, Juan C.; Tortosa, Francisco S.

doi:10.13157/arla.63.2.2016.ra1

Cited by 2 publications

(1 citation statement)

References 54 publications

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“…However, artificial nests give an index of the nest predation rate, and this has recently been used to compare nest predation in a number of experimental designs (e.g. Carpio et al 2016). Artificial nest experiments are also useful for formulating hypotheses.…”

Section: Nest Predation Experiments Wetlandsmentioning

confidence: 99%

Alien predation in wetlands – the Raccoon Dog and water birds breeding success

Nummi

Väänänen²,

Pekkarinen

et al. 2019

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Alien predators are known to potentially strongly affect their prey populations. We studied the impact of raccoon dogs (Nyctereutes procyonoides) on waterbird breeding success in eight semi-urban wetlands in Finland. We manipulated raccoon dog density in two wetlands by removing individuals (2002 protection year, 2003 and 2004 removal years). We additionally performed nest predation experiments. We monitored raccoon dog density, estimated hunting bag size and observed waterbird breeding success. Our hypothesis predicts that the omnivorous raccoon dog plays a role in waterbird breeding success by depredating nests. Our experiments shown that the raccoon dog hunting bag in eutrophic wetlands may be large, as we removed 8.6–20.0 animals per km2. Both our nest predation experiment and field data indicated that raccoon dogs affect the breeding success of waterbirds. We found a significant relationship between raccoon dog density index and predation rate of the artificial nests, but not between red fox (Vulpes vulpes) density and predation on artificial nests. We did not find an association between raccoon dog abundance and the breeding success of mallards (Anas platyrhynchos) and great crested grebes (Podiceps cristatus). However, our study shows that birds species with different breeding strategies – e.g. great crested grebe, mute swan (Cygnus olor), mallard, Eurasian wigeon (Mareca penelope), coot (Fulica atra), lapwing (Vanellus vanellus) and marsh harrier (Circus aeruginosus) – when considered together showed higher breeding success both in 2003 and 2004 when compared to breeding success before removal. There was, however, variation in how strongly the species responded to raccoon dog removal. Our results indicate that the removal of alien raccoon dogs can be an important tool in wetland management. Keywords: ducks, invasive species, lapwing, nest predation experiment, Nyctereutes procyonoides, predator removal

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Section: Nest Predation Experiments Wetlandsmentioning

confidence: 99%

Alien predation in wetlands – the Raccoon Dog and water birds breeding success

Nummi

Väänänen²,

Pekkarinen

et al. 2019

BALT FOR

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Nest density, egg conspicuity, vegetation structure and seasonality affect artificial nest predation in the Brazilian Cerrado

2022

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Nest predators use visual, acoustic and chemical cues to locate nests. In the Neotropics, predation is high being the main cause of nest failure. Despite that, it is still not completely clear what kind of information predators are using to find nests or whether predators respond differently according to habitat characteristics. Here, we executed an experimental manipulation to investigate how different ecological factors influence nest predation probability. We hypothesised that egg conspicuousness, nest clustering and a more open vegetation structure would increase nest predation probability, and that nest predation would be higher during the breeding season of most avian species in the region. We used artificial nests baited with plasticine and quail eggs (Coturnix coturnix), manipulated egg coloration and nest density. Artificial nests were distributed over forest and savanna-like vegetations. Overall predation rate was 40.9%. We found that nests baited with conspicuous eggs, located in open habitats, at higher densities and during the dry period were more predated. Results suggest that main predators must be visually orientated, and that egg crypsis is an important trait for open-nest species in the area. Moreover, a higher nest density may affect predator behaviour, favouring an increase in nest searching, which may be facilitated in open habitats.

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The Influence of Nest Density on Nest Predation in Olive Groves Depends on Habitat Features

Cited by 2 publications

References 54 publications

Alien predation in wetlands – the Raccoon Dog and water birds breeding success

Alien predation in wetlands – the Raccoon Dog and water birds breeding success

Nest density, egg conspicuity, vegetation structure and seasonality affect artificial nest predation in the Brazilian Cerrado

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