author={Jaroslav Picman and Stanislav. Pribil and Andre Isabelle},
Abstract Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) in Manitoba breed in dense colonies in cattail marshes. Their reproductive success is affected mainly by predation. The most important predator on blackbird nests is the Marsh Wren (Cistothorus palustris), which breaks blackbird eggs and kills small nestlings. We examined whether colonial nesting in Yellow-headed Blackbirds may represent an adaptation to reduce Marsh Wren predation. Marsh Wren predation may be reduced by (1… 

Predator density influences nest attendance of Yellow-headed BlackbirdsXanthocephalus xanthocephalus

It is suggested that Yellowheaded Blackbirds are sensitive to nestpredation risk and alter their behaviour accordingly to increase overall fitness, although future research is needed to evaluate the influence of Marsh Wren nest predation on the reproductive success of YellowheadedBlackbirds.

Reduced Predation at Interior Nests in Clustered All-Purpose Territories of Least Flycatchers (Empidonax Minimus)

This result is the first evidence of reduced predation within nesting clusters of a species that defends all-purpose territories, and lends substantial support to the predator-deterrence hypothesis.

Nest survival of Tricolored Blackbirds in California's Central Valley

The results suggest that Tricolored Blackbirds benefit from policies that allow them to complete their nesting cycle in agricultural fields, and nest height and nest density were positively associated with DSR.

Dynamics of extinction: population decline in the colonially nesting Tricolored Blackbird Agelaius tricolor

Recovery of this species presents possible conflicts in conservation policy because successful reproduction now largely depends on invasive non-native plants and the willingness of farmers to delay harvest or to lose portions of their crops.

A Loose Colony of Rusty Blackbirds Nesting in Northern Maine

A loose colony of Rusty Blackbirds breeding in Piscataquis County, ME was located, and mobbing behavior by multiple individuals from different pairs was observed, suggesting that coloniality in this species may be an antipredator strategy.

Nest density and competing risks: A long-term investigation of Black Brant (Branta bernicla nigricans) nest survival

ABSTRACT Many species of seabirds and waterfowl are predominantly colonial breeders, suggesting that colonial breeding is beneficial in some way. For Arctic nesting geese, colonial breeding may be an

Breeding Phenology and New Host List of the Black-Headed Duck (Heteronetta atricapilla) In Argentina

It is found that solitary nesting host species were more likely to be parasitized earlier during the breeding season than colonial nesting species.

The relationship between nest location and breeding success in the colonial nesting Azure-winged Magpie Cyanopica cyanus breeding in Japanese Yew Taxus cuspidata tree plantations

ABSTRACT Capsule Azure-winged Magpies Cyanopica cyanus living in isolated plantations had higher nesting success away from habitat edges and lower breeding success away from conspecific nests. Aims

Breeding success of Cacicus haemorrhous (Linnaeus) (Aves: Icteridae) in different environments in an Atlantic Forest reserve in Southeast Brazil

It was found that colonies established in the swamp presented higher nest survival than the others and the ones in the lake edge had lower survival, while red-rumped cacique had higher success breeding in colonies located in the Swamp.



Antipredation role of clumped nesting by marsh-nesting red-winged blackbirds

Red-winged blackbirds breed in marshes in high densities and their nests are frequently clumped, so the advantage of group life in this population is probably mutual nest protection.


It is concluded that nest predation is an important selective force that likely has played a role in shaping reproductive tactics in the Yellow-headed Blackbird.

Yellow-headed blackbird nest defense: aggressive responses to marsh wrens

Male responses are interpreted as reflecting territorial defense against Marsh Wrens, and female responses as a localized nest defense against egg predators.

Predator behavior favors clumped nesting in an oceanic seabird

The most compelling comparative test of the hypothesis that predators preferentially take the most iso- birds is the most compelling comparison of the data available, available data are equivocal.

Impact of marsh wrens on reproductive strategy of red-winged blackbirds

Marsh wrens have an important effect on redwing reproductive strategy and appear to be more successful in dense cattail whereas redwings are the more successful species in sparser vegetation.

Destruction of eggs by the long-billed marsh wren (Telmatodytes palustris palustris)

It is suggested that nest destruction by marsh wrens has evolved as an interference mechanism to reduce possible interspecific competition and exclude redwing blackbirds and possibly some other marsh nesting species from certain parts of marsh nesting areas.

Parasitism of House Wren nests by Brown-headed Cowbirds: why is it so rare?

Five hypotheses that may explain why House Wren nests are rarely parasitized by Brown-headed Cowbirds are tested and found that female cowbirds cannot enter circular entrances smaller than 38 mm in diameter, and wrens prefer cavities with small entrances to those with large entrances.

Why do Gray Catbirds destroy eggs in nests of other birds? Experimental tests of alternative hypotheses

Catbird responses to experimental nests and eggs are examined and it is found that catbirds break eggs in experimental nests throughout their nesting cycle, and destroy eggs in heterospecific nests more frequently than in conspecial nests.

Experimental study on the role of intra- and inter-specific competition in the evolution of nest-destroying behavior in marsh wrens

The combined data on wren responses from 4 years showed that male marsh wrens exhibited stronger responses to redwing than to wren nests, which suggests that in the study area the interference from blackbirds is usually more important than that from other marsh wrecks.