Primeros datos sobre la Tórtola de collar (Streptopelia "risoria") en la ciudad de Santa Cruz de Tenerife (Islas Canarias)

Les tórtores de collar es van detectar per primer cop a la ciutat de Santa Cruz de Tenerife l'any 1988 quan es van observar dues parelles. Des de llavors la població ha augmentat fins a les 18 parelles (cens de 1992). L'espècie construeix els nius en arbres de distintes espècies (Ficus nitida, Coussapa dealbata i Coccolaba uvifera) i sembla que té dos períodes de nidificació: primeres postes de març a abril, i segones d'octubre a novembre. Aquesta població salvatge es va originar a partir d'escapaments d'ocells en captivitat

Assessment of the Potential Role of Tryptophan as the Precursor of Serotonin and Melatonin for the Aged Sleep-wake Cycle and Immune Function: Streptopelia Risoria as a Model

In the present review we summarize the relationship between the amino acid, tryptophan, the neurotransmitter, serotonin, and the indole, melatonin, with the rhythms of sleep/wake and the immune response along with the possible connections between the alterations in these rhythms due to aging and the so-called “serotonin and melatonin deficiency state.” The decrease associated with aging of the brain and circulating levels of serotonin and melatonin seemingly contributes to the alterations of both the sleep/wake cycle and the immune response that typically accompany old age. The supplemental administration of tryptophan, e.g. the inclusion of tryptophan-enriched food in the diet, might help to remediate these age-related alterations due to its capacity of raise the serotonin and melatonin levels in the brain and blood. Herein, we also summarize a set of studies related to the potential role that tryptophan, and its derived product melatonin, may play in the restoration of the aged circadian rhythms of sleep/wake and immune response, taking the ringdove (Streptopelia risoria) as a suitable model

Experience and progesterone in ring dove incubation.

Doves were tested for progesterone-induced incubation after they had acquired previous experience with from one to five different phases of their initial breeding cycle. A sixth group had no previous breeding experience. Previous breeding experience inclusive of at least the nestbuilding phase of the cycle is a significant facilitator of incubation behaviour induced by injected progesterone, but previous experience with only the courtship phase was not sufficient. Experience with phases additional to nestbuilding increased overall nest-responsiveness without significantly increasing the number of birds incubating. The nature of a ring dove's previous experience is therefore an important influence in its behavioural response to exogenous progesterone

Contribution of nesting experience to progesterone-induced incubation in ring doves (Streptopelia risoria).

When a reproductively experienced dove is removed from visual isolation and placed in a breeding cage with an unfamiliar mate and a nest containing eggs, it takes about 5–7 days before it will exhibit incubation behavior. However, similarly experienced doves will exhibit incubation within a few minutes of being placed in a breeding cage if they receive a series of progesterone injections during the last 7 days that they are in isolation (Lehrman, 1958). No other hormone produces such a rapid expression of incubation behavior (Lehrman & Brody, 1961). However, the capacity of progesterone to facilitate incubation requires the joint action of other factors, including other hormones and certain external stimuli. Female doves must have a certain level of circulating estrogen (Cheng, 1979; Cheng & Silver, 1975), and male doves must have appropriate levels of testosterone (Komisaruk, 1967; Stern & Lehrman, 1969). Also, both the mate and the nest with eggs provide stimuli that are required before progesterone will induce incubation (Bruder & Lehrman, 1967; Lehrman, Brody, & Wortis, 1961)

Streptopelia risoria and how Linnaeus had the last laugh

© 2018 The Authors; This is an open‐access article distributed under the terms of the Creative Commons Atribution-NonCommercial Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. The attached file is the published version of the article

Contributions of reproductive experience to observation maintained crop growth and incubation in male and female ring doves.

Previous work has established that experienced male ring doves (Streptopelia risoria) can maintain prolactin-dependent crop growth and readiness to incubate by observing an incubating partner. We report that this is also true for female ring doves. The role of experience in this phenomenon was examined in separate experiments with males and females. Observation of an incubating mate from 3 days after completion of egg laying is sufficient to maintain crop growth and incubation in both male and female ring doves in their second, but not in their first, reproductive cycle. Male and female doves in their first cycle must incubate for a greater part of the cycle before observation of an incubating mate is an effective stimulus; there are no differences between first and second cycle doves separated by a glass plate from the mate and nest 8 days after laying. Experience obtained within the first cycle apparently ensures that previously neutral stimuli come to elicit prolactin secretion. The effectiveness of these stimuli is reinstated early in a second cycle