The fall of a symbol? A high predation rate by the introduced horseshoe whip snake Hemorrhois hippocrepis paints a bleak future for the endemic Ibiza wall lizard Podarcis pityusensis
Invasive species currently account for a major threat to global biodiversity, and
island ecosystems are among the most vulnerable, because of the frequency and
success of spe- cies introductions on islands. Within Mediterranean islands,
reptiles not only are frequently introduced species but are also among the most
threatened because of these introductions. The Balearic archipelago is a good
example of this, since only two of its current 16 species of reptiles are native.
Thirteen years ago, the snake Hemorrhois hippocrepis was introduced by cargo in
Ibiza island, and it is in expansion. Individuals obtain- ed from an early
eradication campaign showed a fast expres- sion of phenotypic plasticity and
acquired larger sizes than those of the source population, probably due to a high
prey availability and predator scarcity. The species is thriving at the expense of a
small variety of native and non-native prey, but
the predation pressure on the endemic Podarcis pityusensis, the only native reptile
in the island, is very high, as this lizard represents 56% of the prey in frequency,
which might threaten its survival on the long term. Our results on the feeding ecology
of the snake are of sufficient concern to justify the main- tenance of actions to
eradicate this invader.
Hinckley A, Montes E, Ayllón E, Pleguezuelos JM. 2017. The fall of a symbol? A high predation rate by the introduced horseshoe whip snake Hemorrhois hippocrepis paints a bleak future for the endemic Ibiza wall lizard Podarcis pityusensis. European Journal of Wildlife Research. 63(1):13.
Hinckley A, Montes E, Ayllón E, Pleguezuelos JM. 2017. The fall of a symbol? A high predation rate by the introduced horseshoe whip snake Hemorrhois hippocrepis paints a bleak future for the endemic Ibiza wall lizard Podarcis pityusensis. European Journal of Wildlife Research. 63(1):13.
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