Non-parental infanticide in a dense population of the Black-billed Magpie (Pica pica)

Lee, Sang‐im; Seo, Kyungseon; Lee, Won Young; Kim, Woohjung; Choe, Jae Chun; Jabłoński, Piotr G.

doi:10.1007/s10164-011-0275-z

Cited by 8 publications

(2 citation statements)

References 29 publications

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“…This camera system would be useful for other applications, including behavioral studies on avian species at nesting, roosting, and foraging sites. This system could easily be modified to record foraging behavior (Kalam and Urfi 2008), diet composition (Gilby et al 2011), nestling behavior (Cestari et al 2010), causes of nestling mortality (Lee et al 2011), and host-parasite interactions (O'Connor et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Monitoring Western Snowy Plover Nests with Remote Surveillance Systems in San Francisco Bay, California

Demers

Robinson-Nilsen

2012

Journal of Fish and Wildlife Management

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The western snowy plover Charadrius nivosus nivosus is listed as threatened under the U.S. Endangered Species Act of 1973 due to long-term population declines related, in part, to nest predation and human disturbance. In San Francisco Bay, California, numbers of predators of western snowy plovers and the potential for recreation-based human disturbances have increased during the past few decades and will likely increase for the foreseeable future. In an attempt to increase the reproductive success of western snowy plovers, managers have dedicated considerable resources to management practices including predator removal and habitat enhancement projects in San Francisco Bay. The unequivocal identification of western snowy plover nest predators and information regarding the behavioral responses of nesting plovers to human disturbance would inform management practices for this species. Therefore, we examined the efficacy of using a digital video surveillance system to identify nest predators of western snowy plovers in former salt evaporation ponds in San Francisco Bay and to assess its potential for use in behavioral studies. This system was designed to minimize disturbance to nesting plovers and limit predator bias at breeding sites that had little or no cover to camouflage or protect the equipment. The system included a small camera with infrared lights placed approximately 20 m from nests and a continuously operating recording unit and power supply that was positioned up to 300 m from nests. The system could be deployed within 20 min, run continuously for up to 5 d, and data could be retrieved without disturbing nesting birds. During a 2-y study period, we recorded six species depredating plover eggs and chicks: red-tailed hawk Buteo jamaicensis, common raven Corvus corax, California gull Larus californicus, northern harrier Circus cyaneus, ruddy turnstone Arenaria interpres, and gray fox Urocyon cinereoargenteus. Our results suggest that this surveillance system was effective for identifying western snowy plover nest predators, and the presence of the camera did not influence nesting success of monitored nests. This system could be integrated into conservation programs intended to improve reproductive success of this species and could be useful for conducting behavioral studies of western snowy plovers and other species.

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Section: Discussionmentioning

confidence: 99%

Monitoring Western Snowy Plover Nests with Remote Surveillance Systems in San Francisco Bay, California

Demers

Robinson-Nilsen

2012

Journal of Fish and Wildlife Management

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“…Thus, in gaze condition, both eye gaze and facial direction were towards the bird; in non-gaze condition, both were away from the bird. In 2008, we carefully chose five experimental sites that were not examined in the previous year to avoid pseudo-replication (magpies are long-lived, stay in the same territories for many years and defend the territories year-round in our study area [49]). …”

Section: Methodsmentioning

confidence: 99%

Direct Look from a Predator Shortens the Risk-Assessment Time by Prey

et al. 2013

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Decision making process is an important component of information use by animals and has already been studied in natural situations. Decision making takes time, which is expressed as a cost in evolutionary explanations of decision making abilities of animals. However, the duration of information assessment and decision making process has not been measured in a natural situation. Here, we use responses of wild magpies (Pica pica) to predictably approaching humans to demonstrate that, regardless of whether the bird perceived high (decided to fly away) or low (resumed foraging) threat level, the bird assessed the situation faster when approaching humans looked directly at it than when the humans were not directly looking at it. This indicates that prey is able to extract more information about the predator’s intentions and to respond sooner when the predator is continuously (“intently”) looking at the prey. The results generally illustrate how an increase of information available to an individual leads to a shorter assessment and decision making process, confirming one of central tenets of psychology of information use in a wild bird species in its natural habitat.

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Cannibalism in common kestrel (Falco tinnunculus)

Haddad

Yosef

2022

acta ethol

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Non-parental infanticide in a dense population of the Black-billed Magpie (Pica pica)

Cited by 8 publications

References 29 publications

Monitoring Western Snowy Plover Nests with Remote Surveillance Systems in San Francisco Bay, California

Monitoring Western Snowy Plover Nests with Remote Surveillance Systems in San Francisco Bay, California

Direct Look from a Predator Shortens the Risk-Assessment Time by Prey

Cannibalism in common kestrel (Falco tinnunculus)

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