Rapid increase in numbers and change of land-use in two expanding Columbidae species (Columba palumbus and Streptopelia decaocto) in Algeria

Bendjoudi, D., Voisin, J.-F., Doumandji, S., Merabet, A., Benyounes, N. & Chenchouni, H. (2015). Rapid increase in numbers and change of land-use in two expanding Columbidae species (Columba palumbus and Streptopelia decaocto) in Algeria. Avian Research 6(1): 18.
doi: 10.1186/s40657-015-0027-9 (Open Access)

Background:

Investigating population ecology of urban bird species, particularly the invasive and expending species, is the key for the success of urban management and planning strategies.

Methods:

Populations of two Columbidae species, the Woodpigeon (Columba palumbus) and the Eurasian Collared Dove (Streptopelia decaocto), were monitored from 1992 to 2010 in the Algiers Sahel, the Mitidja Plain and surrounding areas (Northern Algeria). Monitoring of species densities was performed by the mapping-plot method. The foraging flight routes of Woodpigeon and the distribution of Eurasian Collared Dove were assessed by systematic observations.

Results:

The number of counted birds was statistically constant at first years of the survey, and then increased significantly, beginning from low numbers, their densities accelerated sharply between 2001 and 2006, then reached to an equilibrium state. The significant increase in Woodpigeon’s population could be explained by the reduced hunting pressure and by species adaptation to new food resources provided by nearby agriculture. Indeed, monitoring of flight directions of the species revealed the use of agricultural landscapes and habitats, which is a good indicator explaining adaptation and trophic niche of the species. The occurrence of the Eurasian Collared Dove in Algiers began in 2000. Its density experienced a rapid increase with similar trend pattern as that of Woodpigeon. Its distributional range is confined mainly in suburban environments of the Mitidja Plain.

Conclusion:

The modifications of habitats, urbanization increase and the lessening of hunting in the Mitidja Plain facilitated the rapid expansion of the Eurasian Collared Dove and Woodpigeon as well contributed to the increase in their numbers over time.

Eurasian Collared Dove (Streptopelia decaocto), Bouira, Algeria

Eurasian Collared Dove (Streptopelia decaocto), Lakhdaria, Bouira, Algeria (Abdelaziz Mazouz, flickr)

Dynamics of invasive and expanding species in the Mitidja Plain, Northern Algeria

Bendjoudi, D., Chenchouni, H., Doumandji, S., & Voisin, J.-F. 2013. Bird Species Diversity of the Mitidja Plain (Northern Algeria) with Emphasis on the Dynamics of Invasive and Expanding Species. Acrocephalus 34: 13–26.
doi: 10.2478/acro-2013-0002

Abstract & full text (Open Access):

This treatise investigates the poorly studied bird fauna of Mitidja Plain (Northern Algeria), with particular notes on the occurrence and expansion of new and alien species. Direct observations, supported by ornithological surveys carried out by Progressive Frequential Sampling (PFS), a version of a point count method, have allowed us to identify 125 bird species. These represent 31% of all species known from Algeria. The species recorded belong to 14 orders, 39 families and 37 genera. According to their biogeographic origins, 36 are Mediterranean, 32 Palearctic, 24 Holarctic, 17 European and 16 of European-Turkestani origin. The Mitidja Plain holds 60 resident-breeder species (48% of all registered species) and is a transit zone for many migratory species (summer and winter migrants constituting 20% and 14% of the total, respectively) and occasional visitors (RA = 12%). Among recently expanding species (introduced or local), the Collared Dove Streptopelia decaocto and Wood Pigeon Columba palumbus, sampled by the spot-mapping method, experienced a very rapid population growth. The first observations of the former were made in 1996 in Algiers. Its numbers experienced a steep increase after 2002, starting from 5.75 pairs/10 ha to reach up to 31.5 pairs/10 ha in 2006. The same applies for the Rose-ringed Parakeet Psittacula krameri, surveyed by direct-count at roosting sites. This species has been able to increase and reproduce since its first introduction into the wild in 1996. The increase in study species populations, especially the Rose-ringed Parakeet, may derive from good weather conditions that favoured the species through providing better feeding conditions, thus high reproduction outcomes.

Rose-ringed Parakeet - Perruche à collier (Psittacula krameri), northern Algeria

Rose-ringed Parakeet – Perruche à collier (Psittacula krameri), northern Algeria (Mohamed Missoum‎)

Population growth of Rose-ringed Parakeet (Psittacula krameri) in Mitidja Plain and surrounding areas of Algiers, based on the counts of individuals on roost-sites

Population growth of Rose-ringed Parakeet (Psittacula krameri) in Mitidja Plain and surrounding areas of Algiers, based on the counts of individuals on roost-sites (Bendjoudi et al.)

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)

Première nidification de la Tourterelle turque (Streptopelia decaocto) sur des édifices humains en Algérie

Bougaham, A.F. & Moulaï, R. 2013. Première nidification de la Tourterelle turque Streptopelia decaocto (Frivaldszky, 1838) (Aves, Columbidae) sur des édifices humains en Algérie. Bulletin de l’Institut Scientifique, Rabat, section Sciences de la Vie 35 : 151-153. PDF

Résumé:

La Tourterelle turque Streptopelia decaocto semble bien s’adapter au milieu urbain en Afrique du Nord. Espèce invasive en pleine expansion, elle développe des  comportements anthropophiles en établissant ses nids au niveau d’édifices humains. En Algérie, ce comportement original de nidification de l’espèce pourrait être lié aux nouvelles caractéristiques architecturales des  bâtisses et  à la disponibilité des ressources alimentaires dans ce milieu.

First nesting of Collared Dove Streptopelia decaocto (Frivaldszky, 1838) (Aves, Columbidae) on man-made structures in Algeria.

Abstract:

Collared Dove Streptopelia decaocto seems to adapt to urban areas in North Africa. Invasive species in full expansion, it develops anthropophilic behavior by building their nests in level of man-made structures. In Algeria, the original nesting behavior of this species could be related to the new architectural features of the buildings and the availability of food resources in this environment.

Nid de Tourterelle turque (Streptopelia decaocto) établi sur édifice humain

Nid de Tourterelle turque (Streptopelia decaocto) établi sur édifice humain.