Invasive 'Hulk' Lizard Morph Displacing Native Color Variants in Common Wall Lizards
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A new study reveals that an aggressive, larger variant of the common wall lizard is spreading and causing the disappearance of yellow and orange color morphs. The research, analyzing over 10,000 lizards across 240 populations, shows many areas now host only the white-throated variant. This shift represents a rapid change in a genetic trait that had remained stable for millions of years.
Facts First
- An aggressive 'Hulk' lizard morph is spreading into new areas of the common wall lizard's range.
- The yellow and orange throat color variants are disappearing as the 'Hulk' lizards expand.
- The study analyzed over 10,000 individual lizards across approximately 240 populations.
- The three color morphs had coexisted for millions of years before this recent shift.
- Researchers from Lund University published the findings in the journal Science.
What Happened
A study led by researchers at Lund University has documented a significant shift in the genetic diversity of common wall lizards. The research examined color patterns across roughly 240 populations, analyzing more than 10,000 individual lizards. It found that as a larger, more aggressive group of lizards—informally called 'Hulk' lizards—spreads into new areas, the yellow and orange throat color variants are disappearing. This has left only the white-throated morph in many locations, ending a pattern of coexistence that had persisted for millions of years.
Why this Matters to You
This research matters because it provides a clear, real-time example of how biological diversity can be rapidly reshaped, even by forces within a species. The loss of color variants may be an early indicator of broader ecological changes that could affect local ecosystems you might enjoy or study. For scientists and conservationists, it highlights how quickly long-standing genetic balances can be disrupted, which may inform efforts to monitor and protect biodiversity in other species.
What's Next
The spread of the 'Hulk' morph is likely to continue, potentially leading to a more uniform lizard population across wider regions. Researchers may next investigate the specific advantages driving the 'Hulk' lizards' success and the long-term ecological consequences of this genetic shift. Further monitoring could reveal whether this is an isolated event or part of a larger pattern of rapid evolutionary change in response to environmental pressures.