Tricolored Blackbird (Agelaius tricolor)

Beedy, Edward C.; Hamilton, W. J.; Meese, Robert J.; Airola, Daniel A.; Pyle, Peter

doi:10.2173/bna.tribla.03

Cited by 4 publications

(22 citation statements)

References 10 publications

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“…Carrasco et al (2017) showed that colonial nesting herons and egrets strive to strike a balance between nest site fidelity and habitat preferences, suggesting that a colony may not form in a site that had previously been occupied. This has also been observed in tricolored blackbirds, where most colony sites are not used in consecutive years (Beedy and Hamilton 1997;Holyoak et al 2014;Airola et al 2017). This variable site occupancy can make it challenging to re-capture banded birds and/or to collect yearly population count data (Marshall et al 2004).…”

Section: Introductionmentioning

confidence: 66%

Using citizen science data in integrated population models to inform conservation decision-making

Robinson

Ruiz‐Gutiérrez

Fink

et al. 2018

Preprint

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Analysis of animal population status and change are core elements of ecological research and critical for prioritizing conservation actions. Traditionally, count-based data from structured surveys have been the main source of information used to estimate trends and changes in populations. In the past decade, advances in integrated population models (IPMs) have allowed these data to be combined with other data sources (e.g., observations of marked individuals).IPMs have allowed researchers to determine the direction and magnitude of a species' population trajectory and to test underlying mechanisms. For many species, life-history characteristics (e.g., low site-fidelity), low abundance and/or low detection probability make it difficult to collect sufficient data; thus, IPMs for these species are difficult to employ. We used count data from eBird to estimate population trends for one such species, the tricolored blackbird (Agelaius tricolor). We combined estimates of relative abundance with banding and nesting data. Our joint estimation of demographic rates allowed us to evaluate their individual contributions to the population growth rate. We suggest that investments in increasing reproductive success and recruitment are the most likely conservation strategies to increase the population. The extensive survey efforts of citizen scientists aided the employment of IPMs to inform conservation efforts.

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Section: Introductionmentioning

confidence: 66%

Using citizen science data in integrated population models to inform conservation decision-making

Robinson

Ruiz‐Gutiérrez

Fink

et al. 2018

Preprint

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“…Banding studies (Neff 1942, DeHaven andNeff 1973) and observations of unbanded birds (Payne 1969, Orians 1961, however, demonstrate that some Tricolored Blackbirds reside in the Central Valley throughout the year. Breeding extends from mid-March through early August (Beedy and Hamilton 1999); autumnal breeding (Sep through Nov) has been documented at several sites in the Central Valley (Orians 1960, Payne 1969 and at Point Reyes, Marin County (Jul through Sept; Stallcup 2004). During the breeding season, the species often exhibits itinerant breeding (Hamilton 1998).…”

Section: Seasonal Status In Californiamentioning

confidence: 99%

Tricolored Blackbird (Agelaius tricolor)

Beedy¹,

Hamilton²,

Meese³

et al. 2018

Birds N.Am.

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“…Tricolored blackbird ( Agelaius tricolor ) is a colonial nesting species, restricted to wetland, grassland, and agricultural areas, and a near endemic of California, USA (Beedy et al ). As a colonial nester, tricolored blackbird is particularly vulnerable to population declines and extinction because relatively few large colonies comprise a significant proportion of the total population (Cook and Toft ).…”

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confidence: 99%

“…However, an estimated 95% of wetlands were lost between the 1930s and 1980s (Frayer et al ). Habitat loss and declines in insect prey availability, both consequences of agricultural intensification (Habel and Schmitt ), are likely causes of population declines (Beedy et al ).…”

mentioning

confidence: 99%

“…The restricted geographic range, colonial nesting habit, long‐term population decline, and reliance on shrinking breeding habitats make the tricolored blackbird a species of conservation concern. The species was recently assigned Threatened status under the California Endangered Species Act and is currently being considered for listing under the United States Endangered Species Act (Beedy et al ). Status reviews have sought to evaluate whether declines in abundance or colony size have leveled off in recent decades.…”

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confidence: 99%

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Trends in tricolored blackbird colony size: 2008 through 2017

et al. 2019

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Tricolored blackbird (Agelaius tricolor) is a colonial breeder, largely restricted to grasslands, wetlands, and agricultural areas of California, USA. Tricolored blackbird abundance declined considerably during the twentieth century. Recent trends have been less clear, however, hindering efforts to evaluate the conservation needs of the species. We assessed trends in tricolored blackbird colony size using 2008, 2011, 2014, and 2017 Triennial Tricolored Blackbird Statewide Survey, a community‐science effort involving hundreds of volunteer observers. After accounting for variation in observer characteristics and survey effort, we found a clear, statistically significant decrease in average colony size of approximately 5% per year, which translated to a decrease in average colony size of approximately 40% between 2008 and 2017. This decrease in colony size matches the overall decline in abundance reported in another recent study and reinforces the conclusion that tricolored blackbird is in need of protection and recovery efforts. © 2019 The Authors. The Journal of Wildlife Management published by Wiley Periodicals, Inc. on behalf of The Wildlife Society.

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Tricolored Blackbird (Agelaius tricolor)

Cited by 4 publications

References 10 publications

Using citizen science data in integrated population models to inform conservation decision-making

Using citizen science data in integrated population models to inform conservation decision-making

Tricolored Blackbird (Agelaius tricolor)

Trends in tricolored blackbird colony size: 2008 through 2017

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