Migration of the Tricolored Red-Wing in Central California

Neff, Johnson A.

doi:10.2307/1364223

Cited by 6 publications

(4 citation statements)

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“…McCabe (1932) described the strychnine poisoning of 30,000 breeding adults as part of an agricultural experiment. Neff (1942) considered poisoning to regulate numbers of blackbirds preying upon crops (especially rice) to be a major source of mortality. This practice continued until the 1960s, and thousands of Tricolored Blackbirds and other blackbirds were exterminated to control damage to rice crops in the Central Valley.…”

Section: Threatsmentioning

confidence: 99%

Tricolored Blackbird (Agelaius tricolor)

Beedy¹,

Hamilton²,

Meese³

et al. 2018

Birds N.Am.

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Section: Threatsmentioning

confidence: 99%

Tricolored Blackbird (Agelaius tricolor)

Beedy¹,

Hamilton²,

Meese³

et al. 2018

Birds N.Am.

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“…Market hunting was a major source of mortality between the later nineteenth and early twentieth century (Neff 1937). This period was shortly followed by large-scale poisoning efforts to control crop depredation during the 1930s (Neff 1942). Since c.1930, when Tricolored Blackbird was identified as an agricultural pest, subsequent population data (Orians 1961, DeHaven et al 1975a, Hamilton 2000 have shown a continuing decline throughout its range.…”

Section: Causes Of Population Declinementioning

confidence: 99%

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

Cook¹,

Toft

2005

Bird Conservation International

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Tricolored Blackbird Agelaius tricolor is a rapidly declining species largely endemic to California and forms larger breeding colonies than any other extant North American landbird following the extinction of Passenger Pigeon Ectopistes migratorius. We present information on its distribution, breeding habitat and changes in global population size using data collected since the 1930s. We also present data on reproductive success at 103 colonies between 1992 and 2003. While possibly once the most abundant bird throughout much of its range, it declined by over 50% between the 1930s and early 1990s, and by a further c. 56% between 1994 and 2000. The global population is now smaller than the historic size of some individual breeding colonies. Reproductive success was significantly higher in upland non-native vegetation (primarily Himalayan blackberry Rubus discolor) than in native emergent cattail Typha spp. and bulrush Scirpus spp. marshes, its likely predominant historic breeding habitat. Contemporary losses of important upland nesting substrate, combined with low reproductive success in native habitats and complete breeding failure in harvested agricultural fields, are the most likely causes of recent declines. 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.

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“…Our genome‐wide analyses also illustrate higher and more far‐reaching vagility by tricoloreds than previously known, though multiple studies employing bands on thousands of individuals have revealed large‐scale movements over major portions of the breeding range. These include, for instance, across the Central Valley (Beedy et al., 2018; DeHaven et al., 1975; Neff, 1942), along the coast (Wilson et al., 2016), and throughout southern California (Neff, 1942). However, because movements were not observed between the Central Valley and southern California, in particular by Neff (1942), the prevailing notion was that tricoloreds should be considered two separate demes split between these areas.…”

Section: Discussionmentioning

confidence: 99%

“…These include, for instance, across the Central Valley (Beedy et al., 2018; DeHaven et al., 1975; Neff, 1942), along the coast (Wilson et al., 2016), and throughout southern California (Neff, 1942). However, because movements were not observed between the Central Valley and southern California, in particular by Neff (1942), the prevailing notion was that tricoloreds should be considered two separate demes split between these areas. This is illustrated in an equivocal presentation of genetic diversity calculations for these two areas by Berg et al (2010) even though they observed no significant genetic differentiation.…”

Section: Discussionmentioning

confidence: 99%

Persistent panmixia despite extreme habitat loss and population decline in the threatened tricolored blackbird (Agelaius tricolor)

Barr

Beichman

Kalhori

et al. 2020

Evolutionary Applications

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Rising anthropogenic pressures over the past century have created a global biodiversity crisis (Ceballos et al., 2015). Countless species have experienced significant population decline due to habitat reduction and alteration in the course of human activities, and many are now threatened with extinction (Zalasiewicz et al., 2011). Efforts to slow and reverse these trends are often limited by a deficiency of information regarding the evolutionary processes that dictate long-term species survival (Smith & Bernatchez, 2008). Historically, attempts to fill this information gap employed genetic markers with the capacity for evaluating only coarse genetic patterns (e.g.,

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Migration of the Tricolored Red-Wing in Central California

Cited by 6 publications

References 0 publications

Tricolored Blackbird (Agelaius tricolor)

Tricolored Blackbird (Agelaius tricolor)

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

Persistent panmixia despite extreme habitat loss and population decline in the threatened tricolored blackbird (Agelaius tricolor)

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