Sand lizard increases, common lizard becomes uncommon

This is a video of baby sand lizards hatching.

From the Dutch herpetologists of RAVON:

December 5, 2010

The sand lizard is doing well in recent years in the Netherlands. But while the populations are growing, we actually very rarely see new areas being colonized. This is because the Dutch scenery has become fragmented in recent decades. In Drenthe, it seems that nonetheless the species has colonized a new territory: in the Zuiderveld near Odoorn, last year for the first time since 1989 a sand lizard has been seen. A reason for optimism?

The sand lizard was seen on the Zuiderveld in the Hondsrug hills in Drenthe. The Zuiderveld is a small and isolated patch of heath. Since 1995 the Reptiles Monitoring Network monitors the Zuiderveld. Here, year after year, only common lizards had been seen in ever smaller numbers. Unfortunately, a typical situation for this species.

Sand lizards in Utrecht province: here.

Acta Herpetologica journal: here.

Singapore: The water monitors of Sungei Buloh Wetland Reserve suffer from few inhibitions; juveniles a mere foot-and-a-half in length bask on the trails with scant concern for the lumbering masses who brave the heat between the hides: here.

In order to communicate in the busy jungle, different lizards have evolved their own body movements and signals, research shows: here.

Most nature lovers know that the more colorful a male fish, reptile, or bird, the more likely it is to attract a female and to have healthy offspring. Females, on the other hand, tend to be drably colored, perhaps to avoid predators while carrying, incubating, and caring for young. Curiously, the female striped plateau lizard, which lives in the rocky slopes of Arizona’s south-eastern mountains, is an exception to this rule in the animal world. Females are more colourful than males – displaying an orange patch on their throats during reproductive season – and the more colourful the female, the more robust are her offspring. New research has found one reason this may be so: here.

Viviparous liolaemids that inhabit cool and harsh environments of Patagonia and the highlands of the Andes exhibit distinctive life-history traits to synchronize births with benign environmental conditions. Researchers studied the reproduction of Phymaturus cf. palluma, a viviparous species that inhabits rocky outcrops in cool environments of the Andean highlands of San Juan, Argentina, and discussed their results in relation to the conservation status of this poorly known species: here.

The Sail-fin Lizard, Hydrosaurus pustulatus, is listed as ‘Vulnerable’ on the IUCN Red List of Threatened SpeciesTM. This semi-aquatic reptile is found in the Philippines, and is as at home in water as it is in trees. These large creatures can exceed a metre in length, although much of this is tail: here.

9 thoughts on “Sand lizard increases, common lizard becomes uncommon

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