Determination of residue levels of the avicide 3-chloro-4-methylaniline hydrochloride in red-winged blackbirds (Agelaius phoeniceus) by gas chromatography-tandem mass spectrometry

Spring Arrival, Aggression and Testosterone in Female Red-winged Blackbirds (Agelaius Phoeniceus)

Female-female aggression among polygynously breeding Red-winged Blackbirds (Agelaius phoeniceus) has been reported by many researchers (e.g. Nero 1956, Roberts and Searcy 1988), but there is little agreement as to its function. A female Red-winged Blackbird might behave aggressively towards other females to deter or delay the settlement of potential competitors (I-Iurly and Robertson 1985, but ...

STERILANTS FOR MANAGING THE POPULATIONS OF RED-WINGED BLACKBIRDS (Agelaius phoeniceus)

We investigated the effectiveness of a coyote (Canis latrans) control program implemented to increase numbers of endangered San Joaquin kit foxes (Vulpes macrotis mutica) at the Naval Petroleum Reserves in California (NPRC). Between 1980 and 1985, the kit fox population on NPRC declined approximately 66% while coyote abundance apparently increased. Coyote predation was identified as the primary...

Anthropogenic noise affects song structure in red-winged blackbirds (Agelaius phoeniceus).

Anthropogenic noise can mask animal signals that are crucial for communicating information about food, predators and mating opportunities. In response to noise masking, signallers can potentially improve acoustic signal transmission by adjusting the timing, frequency or amplitude of their signals. These changes can be a short-term modification in response to transient noise or a long-term modif...

Maternal Yolk Steroids: A Potential Compensatory Mechanism for Red-winged Blackbirds (Agelaius phoeniceus) In North Dakota

Red-winged blackbirds Agelaius phoeniceus use carotenoid and melanin pigments to color their epaulets

Over the past three decades, the red-winged blackbird Agelaius phoeniceus has served as a model species for studies of sexual selection and the evolution of ornamental traits. Particular attention has been paid to the role of the colorful red-and-yellow epaulets that are striking in males but reduced in females and juveniles. It has been assumed that carotenoid pigments bestow the brilliant red...