Boreal Digging Frog: Characteristics and Habitat of Kaloula borealis
The boreal digging frog (Kaloula borealis) is a fascinating member of the Microhylidae family, a group commonly known as "narrow-mouthed" frogs. Found throughout Northeast Asia, this species has developed unique survival strategies that allow it to thrive in environments often shared with human activity.
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Biological Profile and Appearance
As a member of the order Anura, the boreal digging frog possesses the classic anatomical features of frogs, but with specific traits that define its genus, Kaloula. Adult specimens typically reach a length of approximately 4.5 cm. They are characterized by a rounded body shape and skin that features a speckled, toad-like texture.
The life cycle of this species includes a highly efficient larval stage. The tadpoles can grow up to 35 mm (1.4 in) in length, demonstrating a rapid development cycle compared to many other amphibian species in the same region.
Habitat and Distribution
The geographic range of the boreal digging frog spans much of central and northeastern China, the Korean Peninsula, and Jeju Island. These frogs are remarkably adaptable to various landscapes, often inhabiting cultivated fields such as rice paddies. They are frequently found at altitudes ranging from 10 to 900 meters, often living in close proximity to human settlements.
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Breeding and Life Cycle
The reproductive cycle of Kaloula borealis is closely tied to the seasonal weather patterns of Northeast Asia. They breed during the annual rainy season, typically around June and July. During this time, they utilize monsoonal pools to lay their eggs in batches of 15 to 20.
One of the most notable scientific aspects of this species is the speed of its development; tadpoles can reach maturity within just 30 days. Once the rainy season concludes, the adults transition to a fossorial lifestyle, meaning they dig burrows underground to stay protected, emerging only at night to feed.
Conservation Status
While the species is classified as Least Concern by the IUCN 3.1, its status varies by region. In South Korea, for instance, the boreal digging frog is specifically listed as an "Endangered category II species," highlighting the importance of local habitat preservation.
Key Facts
- Scientific Name: Kaloula borealis
- Family: Microhylidae (Narrow-mouthed frogs)
- Adult Size: Approximately 4.5 cm
- Tadpole Size: Up to 35 mm
- Primary Habitat: Cultivated fields, rice paddies, and monsoonal pools
- Breeding Season: June and July (during the rainy season)
- Development Speed: Tadpoles mature in approximately 30 days
Summary Table of Kaloula borealis
| Feature | Details |
|---|---|
| Kingdom | Animalia |
| Phylum | Chordata |
| Class | Amphibia |
| Order | Anura |
| IUCN Status | Least Concern |
| Regional Status (South Korea) | Endangered category II |
Frequently Asked Questions
Where can the boreal digging frog be found?
They are located in Northeast Asia, specifically covering parts of central and northeastern China, the Korean Peninsula, and Jeju Island.
How does the boreal digging frog spend its time outside of the rainy season?
After the rainy season ends, these frogs dig burrows underground and typically only emerge at night to hunt for food.
What makes the tadpoles of this species unique?
The tadpoles are known for their rapid maturation, reaching adulthood within 30 days, which is significantly faster than most other frogs in the area.
What kind of environment does this frog prefer?
They are commonly found in cultivated areas like rice paddies and can live at altitudes between 10 and 900 meters.
Is the boreal digging frog an endangered species?
Globally, the IUCN lists them as Least Concern, but they are considered an Endangered category II species within South Korea.