Ecologic Overlap of Allen and Anna Hummingbirds Nesting at Santa Cruz, California

Legg, Ken; Pitelka, Frank A.

doi:10.2307/1365094

Cited by 25 publications

(7 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Taxonomic groups with reversed sexual size dimorphism do not appear to have reduced aggressive behavior or alternate modes of sexual selection. Male hummingbirds on territories are aggressive, fight, and chase (Legg and Pitelka 1956;Kodric-Brown and Brown 1978), and the larger species are generally dominant and exclude the smaller species from resource-centered territories (Wolf et al 1976). Displaying male bustards also are aggressive (Dharmakumarsinhji 1950;Gewalt 1954;Cramp 1980).…”

Section: Discussionmentioning

confidence: 99%

Sexual Selection, Lek and Arena Behavior, and Sexual Size Dimorphism in Birds

Payne¹

1984

Ornithological Monographs

218

209

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 99%

Sexual Selection, Lek and Arena Behavior, and Sexual Size Dimorphism in Birds

Payne¹

1984

Ornithological Monographs

218

209

View full text Add to dashboard Cite

show abstract

“…He concluded that the "details of success in competitive establishment of S. sasin males in these instances are unknown." A few years later, at a more southern study site (in Santa Cruz rather than Berkeley, California) male S. sasin tended to dominate male C. anna (Legg and Pitelka 1956). Our arguments relating productivity, body size and payoff asymmetries provide a readily testable explanation of these trends.…”

Section: Community Structure Of Nectarivoresmentioning

confidence: 94%

Territory quality and territorial behavior in two sympatric species of hummingbirds

Ewald

Bransfield

1987

Behav Ecol Sociobiol

View full text Add to dashboard Cite

Changes in territorial behavior of blackchinned hummingbirds (Archilochus alexandri) in response to experimental changes in territory quality were investigated using artificial feeders and simultaneous, pair-wise observations of owners. Some of the responses of A. alexandri were similar to those documented by a previous study of the Anna's hummingbird (Calypte anna): A. alexandri defending rich territories spent more time on their territories, encountered a greater percentage of intruders, and chased more intruders than did A. alexandri defending poor territories. In contrast to C. anna, A. alexandri supplemented chases with energetically inexpensive threat vocalizations more extensively when territory quality was increased. This difference may be related to A. alexandri's more tenuous control of rich territories. When both species were observed on very poor territoties, A. alexandri chased a greater percentage of intruders, consumed a greater proportion of available food, and obtained a greater net energy gain from their territories. When observed simultaneously on territories with ad lib food, both species defended highly exclusive territories but A. alexandri suffered higher intrusion pressure and spent more time and energy in defense. These interspecific differences in territorial behavior may facilitate sympatric coexistence of the two species through aggressive partitioning of flower patches according to productivity: the greater payoff received by C. anna on rich territories and A. alexandri on poor territories should favor a corresponding monopolization of rich areas by C. anna and poor areas by A. alexandri.

show abstract

“…Tropical species of dense vegetation, either forest interior or second growth, are more likely to give "static" displays, including song, from a perch (Skutch 193 1). Even in those North American species found in woodland habitats, male breeding territories are at clearings and edges (Saunders 1936, Bent 1940Legg andPitelka 1956, Stiles 1973).…”

Section: Ruschi 1962) the Highland Green Violetearmentioning

confidence: 99%

Aggressive and Courtship Displays of the Male Anna's Hummingbird

Stiles

1982

The Condor

104

View full text Add to dashboard Cite

The aggressive and courtship displays and vocalizations of the male Anna' s Hummingbird (Culypte anna) are described in detail, and various types of evidence and observations are used to reconstruct the typical courtship sequence. Initial contact is made by the female flying to the male' s territory and attempting to feed; she may have previously visited several other territories in order to evaluate territory quality. The well-known dive display is an aggressive maneuver by the male, although it may play a role very early in the courtship sequence. Following a lengthy chase towards the female' s nesting area, she alights low in dense vegetation. The male then gives the displays most critical for courtship: a back-and-forth "shuttle" display and high-intensity song. These hitherto undescribed displays occur immediately preceding copulation, and are probably the most important isolating mechanisms for the species. Many of the elements of courtship in C. an~la are widespread in hummingbirds. Practice and probably learning play a major role in the maturation of song and dive displays in the individual. The courtship sequence in this hummingbird probably represents the resultant of various selective pressures, some acting mainly on males and others on females. Hummingbirds are becoming among the beststudied of North American birds, particularly with respect to energetic aspects of nesting (

show abstract

Ecologic Overlap of Allen and Anna Hummingbirds Nesting at Santa Cruz, California

Cited by 25 publications

References 6 publications

Sexual Selection, Lek and Arena Behavior, and Sexual Size Dimorphism in Birds

Sexual Selection, Lek and Arena Behavior, and Sexual Size Dimorphism in Birds

Territory quality and territorial behavior in two sympatric species of hummingbirds

Aggressive and Courtship Displays of the Male Anna's Hummingbird

Contact Info

Product

Resources

About