L’effet de l’urbanisation sur le phénotype de la Tourterelle turque (Streptopelia decaocto) dans le Nord-Est algérien

Belabed, A.I., Aouissi, H.A., Zediri, H., Djemadi, I., Driss, K., Houhamdi, M., Eraud C. & Bouslama Z. 2013. L’effet de l’urbanisation sur le phénotype de la Tourterelle turque (Streptopelia decaocto) dans le Nord-Est algérien. Bulletin de l’Institut Scientifique, Rabat, Section Sciences de la Vie 35: 155-164.  PDF

Résumé:

De nombreuses espèces d’oiseaux se sont adaptées à l’homme, en particulier, les espèces invasives associées aux villes. Ces adaptations aux environnements urbains sont exprimées par des changements du comportement et de la physiologie, reflétant une évolution ou bien une plasticité phénotypique (Møller 2008). Bien que la Tourterelle turque (Streptopelia decaocto) soit une des espèces de colombidés les plus répandues dans les différents milieux algériens ces dernières années (Merabet et al. 2010, Belabed 2013), les données sur sa biométrie sont quasi inexistantes. Ce travail, mené en 2011, dans la région du Nord-Est Algérien, a pour objectif de produire des informations sur l’effet du degré d’urbanisation sur le phénotype des tourterelles turques adultes dans la wilaya d’Annaba (Extrême Nord-Est algérien), et ceci en s’appuyant sur leur morphométrie. Pour ce faire, la méthode consiste à capturer des individus adultes dans deux sites différents (l’un urbain et l’autre périurbain), et de mesurer les paramètres morphologiques suivants : le poids, la hauteur, la largeur et la longueur du bec, la longueur du culmen, du collier, du tarse, de l’aile pliée et tendue, de  la 5ème rémige, ainsi que l’envergure. Nos résultats montrent qu’il y a des différences significatives entre les individus capturés dans les deux milieux. En effet, le collier, l’aile pliée, l’aile tendue et l’envergure sont plus importants chez les individus du milieu périurbain, alors que les individus urbains montrent une hauteur et une longueur du bec plus importantes. Ceci témoigne de différences adaptatives au vol et à la nourriture, entre les deux sites.

The effect of urbanization on the phenotype of the Collared Dove (Streptopelia decaocto) in northeastern Algeria

Abstract:

Numerous species were adapted to humans, especially invasive species associated to humans in towns and cities. These adaptations to urban environments are expressed by changes in behaviour and physiology, reflecting phenotypic plasticity or evolution (Møller, 2008). Although the Collared Dove (Streptopelia decaocto) is one of the most common Columbidae species in the different Algerians environments during the recent years (Merabet et al. 2010, Belabed 2013), the data on its biometry are almost nonexistent. This work, conducted during 2011, in north-eastern Algeria, aims to produce information on the effect of the degree of urbanization on the phenotype of Collared Doves adult in Annaba (extreme north-eastern Algeria), based on their morphometric data. To do this, our methodology was to capture adult individuals in two different sites: one urban and one suburban, and measure the morphological parameters. The parameters that have been considered are: weight, height, width and length of the beak, length of culmen, collar, tarsus, stretched and bent wing, the fifth remix and finally the wing span. Our results show that there are significant differences between the individuals captured in both environments. Indeed, the collar, the stretched and bent wing and the wing span are more important for individuals in suburban site. Whereas, urban individuals show height and a larger bill length. Showing differences in adaptive flight and food, between the two sites. While urban individuals show a height and length of beak more important. This reflects differences in adaptive flight and food between the two sites.

Tourterelle turque - Collared Dove (Streptopelia decaocto)

Tourterelle turque – Collared Dove (Streptopelia decaocto) (photo: Arnstein Rønning, Wikimedia)

Breeding performance of blue tits in relation to lead pollution and nest failure rates in Algeria

Brahmia, Z., Scheifler, R., Crini, N., Maas, S., Giraudoux, P., & Benyacoub, S. (2013). Breeding performance of blue tits (Cyanistes cæruleus ultramarinus) in relation to lead pollution and nest failure rates in rural, intermediate, and urban sites in Algeria. Environmental Pollution 174: 171-178.

Abstract:

The breeding parameters and the egg and nestling morphology of Cyanistes caeruleus populations from rural, intermediate, and urban sites in Algeria and the relationships of those variables with lead contamination were studied during three consecutive years. Breeding success was explained only by predation and vandalism rates. Predation was higher in the rural area, whereas vandalism was higher in the urban site. The other measured breeding parameters and egg characteristics were relatively insensitive to study site. The morphology of urban nestlings exhibited a trend toward smaller body size and mass compared to individuals from intermediate and rural sites. Although lead concentrations were higher in the tissues of urban birds than in intermediate and rural individuals, we did not detect a clear influence of this variable on nestling morphology. We conclude that urbanization influenced blue tit breeding parameters through predation and vandalism and nestling morphology through mechanisms other than lead pollution.

Highlights:

► Life history traits in relation to lead contamination were studied in blue tits from rural, industrial and urban sites.

► The study took place in Annaba, the fourth most populated city of Algeria, during 3 consecutive years.

► Breeding success depended on predation and vandalism, which were high in the rural and urban sites, respectively.

► Urban nestlings exhibited a trend toward smaller body size and mass, which was not explained by lead contamination.

► Urbanization influences breeding success and nestling morphology in blue tits through other mechanisms than lead pollution.