AG-Magazin (im Druck)
Online-Magazin (pdf)
Online-Artikel (html)
Literatur- und Poster Projekte
der Echten Eidechsen, Familie Lacertidae
Podarcis pityusensis Escull d’en Terra (pityusensis)
Barbadillo, L.J. & Lacomba, J.I. & Pérez-Mellado, V. & Sancho, V. & López-Jurado, L.F. (1999) -
Berg, M.P. van den (2011) -
In diesem Artikel wird eine Einführung in die geologische Geschichte der Balearen gegeben, die zur Trennung von Podarcis lilfordi (GÜNTHER, 1874) und Podarcis pityusensis (BOSCÁ, 1883) als eigene Arten geführt hat. Mithilfe eines Modells vom Antieg des Meeresspiegels während des Holozäns in Kombination mit bathymetrischen Daten wird zudem versucht, eine Einschätzung zur zeitlichen Trennung der Eidechsenpopulationen in geologisch jüngster Zeit zu geben.
Berg, M.P. van den (2015) -
New data on estimated divergence times of the populations of lacertid lizards in the Balearic Islands are provided in this second update of the October 2011 article: Estimating recent divergence time in populations of Podarcis lilfordi (GÜNTHER, 1874) and Podarcis pityusensis (BOSCÁ, 1883) (VAN DEN BERG 2011), which received its first update May 2012. In most cases better estimations of divergence times were available by using the NAVIONICS SonarCharts™webapp.
Berg, M.P. van den & Zawadzki, M. (2017) -
This is already our seventh report in a series on our whereabouts while collecting data for a future revision of the present subspecific order of the endemic Balearic sisterspecies Podarcis lilfordi (GÜNTHER, 1874) and Podarcis pityusensis (BOSCÁ, 1883) (VAN DEN BERG & ZAWADZKI 2011 ; VAN DEN BERG et al. 2013 ; VAN DEN BERG et al. 2014a ; VAN DEN BERG et al. 2014b ; VAN DEN BERG et al. 2015 ; VAN DEN BERG et al. 2016). During this trip from the 8th until the 21st of April 2017, we were able to collect data at some mainland Ibiza locations, as well as on the following adjacent islands: Caragoler, Escull d’en Terra, Negra Norte, Vedranell, Conillera and Ses Margalides. We continue with the ventral coloration as a possible determining key as introduced in our 2014 trip report (VAN DEN BERG et al. 2014b). Images of the anal shields are presented of each lizard for purposes of illustration. Also we report on a new approach of assessing small islands, which have been considered without lizards in the past, or haven’t been considered at all, for the possibility of hosting a lizard population. Investigating these “uninhabited” small islands resulted in one new to describe population of Podarcis pityusensis, and a proven occurrence of a lizard population on another small island.
Cirer, A.M. (1982) -
Cirer, A.M. (1987) -
In this paper are presented the results obtained with 45 populations of Podarcis pityusensis. Several multivariant technics are performed: discriminant analysis, cluster analysis and canonic analysis of populations. These populations present gradual change in all their biometric characteristics, and also a great interpopulation variability, that invalidate th statistical methods to discriminate between all of them. In different analysis very related population groups are found, that suggests they are constitute the same subspecies, in the actual taxonomic sense. These groups always inhabits islands with the same geological age, it is therefore necessary to complete the study with othr biological reflections, all of which are getting ready.
Eisentraut, M. (1949) -
Martínez-Rica, J.P. & Cirer, A.M. (1982) -
The status of the populations of Podarcis pityusensis on about 70 islets and small islands around Ibiza and Formentera (Balearic Islands) is examined, using data from our own observations, and, to a lesser amount, other publications. Lizard populations were found on 43 islets, but data are lacking for another 13. Only 10 sites (18 %) have abundant and well-maintained populations. In 13 localities (23%), there is no geographic isolation between the populations, or this isolation is very poor and incomplete. The high probability of populations mixing, or actual observation of this mixing, in 19 islands (34%) is indicated. Human pressure on lizard populations is strong in 14 cases (25 %). And finally, 18 populations (about one third) may be considered highly endangered or already extinct by elimination or genetic mixing with other populations. Among the subspecies which became extinct through mixing are P.p. miguelensis, P.p. subformenterae, P.p. algae, P.p. sabinae and P.p. grueni. The need for adequate protective measures aimed at the conservation of the remaining populations is emphasized.
Mayol Serra, J. (1985) -
Mayol, J. (2004) -
Available data regarding conservation status of lizard populations from Balearic Islands, as well as threat factors affecting them are presented. Some populations are highly threatened, due to their intrinsic limitation of island surface occupied and, in addition, there are cases of viable artificial populations. Hence, we propose the translocation of most threatened populations to islets today unoccupied by lizards. We show the critria under which such operation could be performed.
Salvador, A. (1986) -
Salvador, A. (2006) -
Salvador, A. (2009) -
Salvador, A. & Pleguezuelos, J.M. (2002) -
Viada Sauleda, C. (2021) -
Zawadzki, M. & Berg, M.van den (2017) -
Es wird über die Entdeckung einer Population der Pityuseneidechse Podarcis pityusensis (Boscá, 1883) auf dem kleinen Felseneiland Escull d`en Terra an der Südspitze Ibizas berichtet. Bei den Besuchen am 11. und 12. April 2017 konnten vier Eidechsen (zwei Männchen und zwei Weibchen) gefangen und untersucht werden. Insgesamt wurden vier Männchen, sechs Weibchen und zwei juvenile Eidechsen gezählt, womit wahrscheinlich bereits fast die gesamte Population erfasst worden sein dürfte. Damit beherbergt der Escull d´en Terra eine der kleinsten Populationen von Podarcis pityusensis. Insgesamt gleichen die Eidechsen der Insel im Erscheinungsbild den Tieren von Ibiza, sodass die neue Population zur Nominatform P. p. pityusensis gestellt wird.