Altitudinal distribution and blood values in the toad, Bufo spinulosus Wiegmann.

Area of Science:

• Comparative physiology
• Altitude biology
• Herpetology

Background:

• Organisms exhibit physiological adaptations to survive in extreme environments.
• High-altitude environments present challenges such as hypoxia and temperature variations.
• Bufo spinulosus toads inhabit diverse altitudes, offering a model for studying adaptation.

Purpose of the Study:

• To investigate hematological differences between lowland and highland populations of Bufo spinulosus.
• To identify physiological traits associated with high-altitude adaptation in toads.
• To compare red blood cell parameters and body size across different altitudes.

Main Methods:

• Blood samples were collected from adult Bufo spinulosus toads from lowland and highland regions.
• Measurements included red blood cell count, red blood cell size, hematocrit, and hemoglobin concentrations.
• Plasma total solid concentration and body size were also assessed.

Main Results:

• Highland toads had smaller red blood cell size and a trend toward higher red blood cell counts compared to lowland toads.
• Lowland toads exhibited higher hematocrit values.
• Highland toads demonstrated higher corpuscular hemoglobin concentration and smaller body size.

Conclusions:

• Smaller red blood cell size and potentially higher red blood cell counts in highland toads may enhance oxygen transport efficiency at high altitudes.
• Distinct hematological profiles suggest adaptation to different environmental pressures.
• Observed traits in highland toads likely contribute to their successful adaptation to high-altitude conditions.