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Neuropeptides and amphibian prey-catching behavior
James A Carr1, Cary L Brown, Roshi Mansouri
1Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA. jacarr@ttacs.ttu.edu
Summary
Neuropeptides like CRH and NPY influence visuomotor control in amphibians, impacting feeding behaviors. These stress-related peptides affect how frogs and toads process visual information, especially under stress.
Area of Science:
- Neuroscience
- Comparative Physiology
- Behavioral Ecology
Background:
- Hypothalamic neuropeptides regulate feeding behaviors in mammals, particularly under stress.
- Recent research suggests stress-related neuropeptides in anurans may influence visuomotor control.
- Neuropeptides like CRH, alpha-MSH, and NPY are known to affect feeding and stress responses.
Purpose of the Study:
- To investigate the role of stress-related neuropeptides in amphibian visuomotor control and feeding.
- To explore how neuropeptides modulate visually-guided prey-catching behavior in anurans.
- To understand the influence of neuropeptides on visual information processing in frogs and toads.
Main Methods:
- Studies in anurans (frogs and toads) were used to examine neuropeptide function.
- Investigated the effects of corticotropin-releasing hormone (CRH) and alpha-melanocyte-stimulating hormone on visually-guided prey-catching.
- Examined the role of Neuropeptide Y (NPY) in pre-tectal-tectal pathways and its neuromodulatory functions.
- Traced projections of melanocortin, NPY, and CRH neurons to visuomotor structures in the amphibian brain.
Main Results:
- CRH and alpha-melanocyte-stimulating hormone were found to inhibit visually-guided prey-catching in toads.
- NPY may act as a neuromodulator in inhibitory pathways crucial for distinguishing predators from prey.
- Melanocortin, NPY, and CRH neurons project to key visuomotor areas, indicating a role in modulating prey-catching.
- Neuropeptides involved in mammalian feeding behavior also influence the effectiveness of visual stimuli in triggering prey-catching in amphibians.
Conclusions:
- Neuropeptides implicated in mammalian feeding disorders also affect fundamental visuomotor control in amphibians.
- These neuropeptides play a significant role in how anurans gather and process visual information, particularly during stressful conditions.
- The findings suggest a conserved role for these neuropeptides in modulating feeding-related behaviors and sensory processing across vertebrates.