Hyla savigni (Linnaeus 1758) (Hyla arborea) Tree Frog
Hebrew name: אילנית מצויה, ilanit metzuya
Global Threat: LR/nt – Lower Risk/near threatened
Regional Threat: VU (A1c) – Vulnerable
Distribution area: The entire Mediterranean region in Israel, including the northern Negev.
Historic distribution: The entire area north of the southern edge of the Dead Sea (Mendelssohn & Steinitz 1944).
Typical Habitat: Tadpoles develop in winter pools and permanent pools; adults spend the summer on green plants in irrigated fields and gardens, and winter on plants and under rocks near their breeding sites.
Threat and Disturbance Factors:
1. Habitat destruction (water sources drying up).
2. Water source pollution.
Population Size: The population in Israel is roughly estimated at a several thousand. Tree frog tadpoles were found at 74 sites in the latest surveys held in the late 1990s (Gafny & Gasith unpubl., Degani & Kaplan 1999), but this data is probably only partial.
Fluctuations in Population Size: The number of active egg deposition sites in Israel has decreased by over 30% in the past 10 years, which indicates a similar decrease in the number of populations.
Isolation Between Subpopulations: There still seems to be population continuity in Israel.
Necessary Steps for Species Preservation: Protecting winter pools from drying up and pollution. Excavating artificial winter pools in nature reserves and protected sites.
Global Distribution area: Europe south of latitude 560, except for the British Isles; central Asia from Turkey to Japan; the Middle East; North Africa; the Canary Islands.