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- Aves (4)
- Birds (4)
- Copulation (4)
- Sexual behavior in animals (4)
- <em>Tachycineta bicolor</em> (1)
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- <em>Passer domesticus</em> (1)
- 4 - Evolutionary Biology & Paleontology (1)
- Articles (1)
- Basking (1)
- Bird evolution (1)
- Cloaca (1)
- Coleoptera (1)
- Confuciusornis sanctus (1)
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- E. coqui (1)
- Evolution (1)
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- Sexual dimorphism (1)
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Articles 1 - 8 of 8
Full-Text Articles in Animal Sciences
A Hypogean New Species Of Trechus Clairville, 1806 (Coleoptera, Carabidae) From Portugal And Considerations About The T. Fulvus Species Group, Ana Reboleira, Vicente Ortuño, Fernando Gonçalves, Pedro Oromí
A Hypogean New Species Of Trechus Clairville, 1806 (Coleoptera, Carabidae) From Portugal And Considerations About The T. Fulvus Species Group, Ana Reboleira, Vicente Ortuño, Fernando Gonçalves, Pedro Oromí
Ana Sofia P.S. Reboleira
A new hypogean ground beetle species, Trechus tatai n. sp. from the Montejunto karstic massif in Portugal is described. Morphological diagnostic characters of the imago are provided and the new species is included in the Trechus fulvus-group. Comments on the biogeography of hypogean carabid beetles in karstic areas of Portugal and an illustrated key to the males of the T. fulvus-group in the Iberian Peninsula are also included.
Left-Sided Directional Bias Of Cloacal Contacts During House Sparrow Copulations, Karen Nyland, Michael Lombardo, Patrick Thorpe
Left-Sided Directional Bias Of Cloacal Contacts During House Sparrow Copulations, Karen Nyland, Michael Lombardo, Patrick Thorpe
Michael P Lombardo
Most female birds have only a left ovary and associated oviduct. The entry to the oviduct is on the left side of the urodeum of the cloaca. This arrangement may favor males that mount females from the left during copulation if it results in sperm being placed closer to the opening of the oviduct. Therefore, we predicted a left-sided directional bias of cloacal contacts during House Sparrow (Passer domesticus) copulations. Cloacal contacts from the left outnumbered those from the right 74 to 25 (3:1) during 25 bouts of copulation at 11 House Sparrow nests. While this pattern suggests that a …
Within-Pair Copulations: Are Female Tree Swallows Feathering Their Own Nests?, Michael Lombardo
Within-Pair Copulations: Are Female Tree Swallows Feathering Their Own Nests?, Michael Lombardo
Michael P Lombardo
A variety of hypotheses has been proposed to explain why socially monogamous birds copulate repeatedly with their mates when only a single copulation is necessary to fertilize an entire clutch (Birkhead and Møller 1992, Petrie 1992, Hunter et al. 1993). Petrie (1992) hypothesized that a female should copulate frequently with her mate so as to reduce her mate’s involvement in extrapair copulations. By reducing her mate’s involvement in extrapair copulations, a female may: (1) avoid the transmission of parasites and sexually transmitted diseases (Hamilton 1990); (2) may avoid sperm depletion by her mate; and (3) may monopolize her mate’s paternal …
On The Evolution Of Sexually Transmitted Diseases In Birds, Michael Lombardo
On The Evolution Of Sexually Transmitted Diseases In Birds, Michael Lombardo
Michael P Lombardo
"The definitive version is available at www.blackwell-synergy.com".
Sexually transmitted diseases (STDs) in animals are caused by pathogens that are transmitted during copulation. Birds have played an important role in the development of STD-centered theories of mating behavior. However, it is not known whether STDs exist in wild bird populations. While the avian cloaca with its dual functions of gamete transfer and excretion seemingly predisposes birds for the evolution of STDs, the life history patterns of most birds (i.e., seasonal breeders with relatively brief annual periods of sexual activity) suggest otherwise. The importance of STDs as selective forces that shape host …
Left-Sided Directional Bias Of Cloacal Contacts During Tree Swallow Copulations, Aaron Petersen, Michael Lombardo, Harry Power
Left-Sided Directional Bias Of Cloacal Contacts During Tree Swallow Copulations, Aaron Petersen, Michael Lombardo, Harry Power
Michael P Lombardo
Most female birds have only a left ovary and associated oviduct with entry to the oviduct on the left side of the urodeum of the cloaca. We hypothesized that male cloacal contacts during copulation would occur from the left side of females because this would put sperm closer to the entrance of the oviduct. We observed that cloacal contacts from the left outnumbered those from the right by a margin of 3:1 during tree swallow, Tachycineta bicolor, copulations at nestboxes in western Michigan in 1999. The directional bias of cloacal contacts may have an adaptive function.
Basking Behavior Of Emydid Turtles (Chysemys Picta Marginata, Graptemys Geographica, And Trachemys Scripta Elegans) In An Urban Landscape, W. Peterman, Travis Ryan
Basking Behavior Of Emydid Turtles (Chysemys Picta Marginata, Graptemys Geographica, And Trachemys Scripta Elegans) In An Urban Landscape, W. Peterman, Travis Ryan
Travis J. Ryan
Basking is common in emydid turtles and is generally accepted to be in thermoregulatory behavior. In 2004, we quantified and described the basking behavior of turtles in the Central Canal of Indianapolis. This canal system runs through an urban landscape that is dominated by fragmented woodlots, residential areas. and commercial areas. We observed that basking turtles exhibited variable basking behavior. with spatial and temporal shins in basking behavior from east-facing banks in the morning to west-facing banks in the afternoon. Turtles in the Central Canal are subject to frequent disturbance, which altered basking behavior. Many turtles forewent aerial basking on …
Sexual Size Dimorphism (Ssd) Is The Most Consistent Explanation For The Body Size Spectrum Of Confuciusornis Sanctus, Winfried S. Peters, Dieter Stefan Peters
Sexual Size Dimorphism (Ssd) Is The Most Consistent Explanation For The Body Size Spectrum Of Confuciusornis Sanctus, Winfried S. Peters, Dieter Stefan Peters
Winfried S. Peters
Early Cranial Patterning In The Direct-Developing Frog Eleutherodactylus Coqui Revealed Through Gene Expression, Ryan Kerney, Joshua Gross, James Hanken
Early Cranial Patterning In The Direct-Developing Frog Eleutherodactylus Coqui Revealed Through Gene Expression, Ryan Kerney, Joshua Gross, James Hanken
Ryan Kerney
Genetic and developmental alterations associated with the evolution of amphibian direct development remain largely unexplored. Specifically, little is known of the underlying expression of skeletal regulatory genes, which may reveal early modifications to cranial ontogeny in direct-developing species. We describe expression patterns of three key skeletal regulators (runx2, sox9, and bmp4) along with the cartilage-dominant collagen 2a1 gene (col2a1) during cranial development in the direct- developing anuran, Eleutherodactylus coqui. Expression patterns of these regulators reveal transient skeletogenic anlagen that correspond to larval cartilages, but which never fully form in E. coqui. Suprarostral anlagen in the frontonasal processes are detected through …