Northern Sporades are a group of islands situated in the NW Aegean, on the north of Evvoia island and on the east of Pilion peninsula. The site includes the SE part of Skopelos and the island of Alonnisos, the only inhabited parts of the site and a number of smaller islands and islets, which are uninhabited, with the exception of the few guards and the occasional cattle-breeders. The largest part of the site is covered by marine habitats, not included in the Annex I habitat types. Geologically, all the islands are dominated by limestone with the exception of Psathoura, which has a clearly volcanic origin. Near Psathoura there are the remnants of an old volcano. The earthquakes of 1867-1868, 1965, and 1973 were destructive. As a result, the population of the old village (Chora) of Alonnisos moved to the harbour, creating the new village of Patitiri. The highest peak in SE Skopelos is Paliouri (546 m). Steep valleys and seasonal torrents are formed on the island. The vegetation consists mainly of Aleppo pine forets, Quercus coccifera maquis, a small forest of Quercus ilex, an Oleo-Ceratonion community, and orchards and olive trees.The highest peak in Alonnisos is Kouvouli (493 m). The vegetation consists mainly of dense maquis with Quercus coccifera, Q. ilex, Arbutus unedo, Juniperus phoenicea (a tall arborescent maquis, Aleppo pine forests, and phrygana (Sarcopoterium spinosum). The pine forests at Skopelos and Alonissos replaced the once dominant oak forests because the pines were supported due to their use in ship-building. The highest peak in Peristera, a mainly rocky island, reaches at 260 m. The vegetation at the central and southern part consists of olive trees, while in the north there is a dense maquis with Quercus coccifera, which suffered by intensive grazing in the past.The highest hills on the island of Kyra Panagia (300 m) are separated by a valley connecting the two main bays of the island, Planitis and Agios Petros, which are the safest ports in N. Sporades. The main vegetation consists of maquis with Pistacia lentiscus, Quercus coccifera, Atbutus unedo, Erica verticulata and olive trees and there are abandoned fields colonized by Vicia viscosa and Mentha pulegium. The highest peak in Gioura island, and in the whole site, reaches at 570 m. The vegetation mainly consists of phrygana (Sarcopoterium spinosum and Euphorbia acanthothamnos). In the middle of the island there is a Quercus coccifera forest. In the central and northern parts of the island, dolines dominated by Crataegus monogyna have been formed. In the cliffs of Gioura a large number of chasmophytic species can be found.The maximum altitude on Psathoura island does not exceed 17 m. The vegetation differs from the one of the other islands, with sparse phrygana (Sarcopoterium spinosum), Olea europea var. sylvestris and Pistacia lentiscus.The embryonic sand dunes and the semi-aquatic habitats host a relatively large number of flora specie (130), not observed on the other islands.The highest altitude in Skantzoura island is 107 m. The vegetation includes Juniperus phoenicea matorral, Sarcopoterium spinosum phrygana, and maquis. The islets around Skantzoura are covered by Euphorbia acanthothamnos phrygana.The highest altitude in Piperi island reached at 353 m. The island is covered mainlny by Pinus halepensis forest, maquis, and phrygana. Many chasmophytes grow on the sea cliffs of Piperi. The site includes marine areas surrounding Alonnisos island, the uninhabited islands of Peristera, Kyra Panagia, Gioura, Piperi, Psathoura and Skantzoura and the nearby islets of the Northern Sporades, as well as the eastern part of Skopelos island from Skopelos Bay on the northern side of the island up to Cape Veloni on the south of Skopelos. Inaccessible cliffs and islets are the main nesting sites for all common seabird species in Greece, including the Mediterranean Shag, Audouin's Gull, Yelkouan Shearwater and Cory's Shearwater, all of which use the surrounding marine areas for foraging and resting, Due to the large number of shearwaters foraging in the area, it is expected that Yelkouan and Cory's Shearwaters from other regions in the North Aegean visit the site to feed, The area is also important for marine mammals, such as cetaceans and the Mediterranean Monk Seal. The area supports a large population of the latter, considered to be the most important for the species in the Mediterranean Sea, Posidonia beds extend along the coast of Alonnisos, Kyra Panagia and Psathoura. |