Social constraints on the onset of incubation in a neotropical parrot: a nestbox addition experiment

Article Abstract:

The impact of early onset of incubation was examined to determine whether it serves to protect eggs from dangers imposed by conspecifics in the green-rumped parrotlet, Forpus passerinus. Nestboxes with eggs were installed and observed for egg destruction and nest-site takeovers. Findings showed that egg destruction at the nestboxes occurred during daylight and all mortality was caused by green-rumped parrotlets. Lone males never caused destruction, although they frequently visited the nestboxes. No significant differences were found in the frequency of visitations of lone males.

Eggs, Bird eggs, Bird nests, Eggs (Biology), Incubation

---

Sex roles, parental experience and reproductive success of eastern kingbirds, Tyrannus tyrannus

Article Abstract:

A study was conducted to examine the parental behavior of eastern kingbird Tyrannus tyrannus during the incubation and nestling periods. The effect of having previous breeding experience to the extent of parental roles being assumed was also determined. Results indicate that female kingbirds spend all their time with incubation while the males only give 60% of their time in guarding the nests. Furthermore, females are also found to be more vigilant as compared to their male partners. Hence, it was concluded that the female kingbirds assume more parental roles.

Familial behavior in animals, Animal familial behavior

---

Assessing parental effort in a Neotropical parrot: a comparison of methods

Article Abstract:

Four of the behavioral or body condition indices for evaluating avian parental effort are nest provisioning rate, time spent foraging, mass variations in parents birds during the breeding season and feeding latency. The effectiveness of these indices were measured by observing the behavior of breeding-rumped parrotlets and comparing the data gathered with field metabolic rate measurements. Results suggest that all four indices have potential limitations in measuring avian parental effort.

Similar abstracts:

• Abstracts: Attentional resolution and the locus of visual awareness. Predicting the present. When colours moves
• Abstracts: Shiny cowbirds follow the 'shotgun' strategy of brood parasitism. Spatial patterns of shiny cowbird brood parasitism on chestnut-capped blackbirds
• Abstracts: Real-time observation of vortex lattices in a superconductor by electron microscopy. Observations of individual vortices trapped along columnar defects in high-temperature superconductors
• Abstracts: Voluminous volcanism on early Mars revealed in Valles Marineris. Evidence for recent volcanism on Mars from crater counts
• Abstracts: Effect of auxiliary males on territory ownership in the oribi and the attributes of multimale groups. The maintenance of borders between male oribi

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.