ricerche e documentazione

Flore De La Tunisie , Angiospèrmes-dicotylédones, Gamopetales

Authors(s) : G. POTTIER-ALAPETITE

Num. of pages : 1190

Tipo : Guide/manuel/cahier technique

The Eleonora’s Falcon, Falco eleonorae Gené, 1839 (Accipitriformes Falconidae), is a long
migrant and a seabird of conservation concern. After discovering the Sérigina colony in
Northeast Algeria, data on laying period, reproductive success, and nestling growth were
collected. A total of 18 nests were located and surveyed during the breeding season of 2006.
The species started to lay eggs in late July and the majority of nests contained 3 eggs. There
was no variation in the mean eggs volume and weight between different clutches. The mean
clutch size was 2.39 ± 0.78 eggs and the hatching success was 53.5%. Productivity per nest
was 0.39 ± 0.40 chick, lower than previous published works. Inclement weather and avian
predation was thought to be the main sources of chicks’ mortality. Nestling growth for both
body mass and wing span fitted a linear fashion during the first 25 days in nestling life. The
accelerated chick growth suggested food availability and high parental provisioning. Finally,
we think that Algerian’s coast could support other large colonies that should be discovered,
surveyed, and conserved.

Authors(s) : Salah Telailia, Menouar Saheb, Lamia Boutabia, Mourad-Abdelkrim Bensouilah & Moussa Houhamdi

Lingua : English

Num. of pages : 8

Tipo : Publication scientifique

Algerian and Tunisian coasts host more than one hundred small islands and islets, but are still poorly known. We have compiled recently published and unpublished data from “PIM initiative” (Mediterranean small island initiative) and other kind of expeditions. For each small island or archipelago we seek to establish the membership to or relationship with the regional hotspots of the Mediterranean basin and the important plant areas (IPA) of Algeria and Tunisia, thanks to species-area relationships and biogeographical analyses. Nowadays, 25 small islands are considered as botanically well-known and can be analysed. Species-area relationship follows a classical linear regression model while some islands are less rich than predicted and other ones are more rich. These richest islands can be assessed as IPA following criterion B. Some of them have been yet assessed as IPA following criterion A, especially because of presence of local or regional endemism. Each main archipelago shows biogeographical links not only with neighbour continental coasts, but also with northern coasts or big islands from the western Mediterranean, especially the Tyrrhenian complex. “Grand Cavallo” and “Petit Cavallo” islands are highlighted here as the 23rd IPA from Algeria. As biodiversity hotchpotch, each small island or archipelago should play a significant role in the conservation programs although some of them are still unexplored and a deeper taxonomical knowledge is necessary in the north-African context.

Authors(s) : VELA.E, PAVON.D

Lingua : English

Num. of pages : 20

Edizione : Biodiversity Journal

Tipo : Publication scientifique

Authors(s) : Mohamed Zaher KAMMOUN

Tipo : Dossier de presse