Abstract

AbstractThe respiratory system of the crab Cancer magister has been investigated with long‐term measurements of the activity in the heart and scaphognathites of unrestrained animals settled on a natural, sandy substrate. Although crabs generally remained motionless in the experimental apparatus, except while in the dark, they initially exhibited a high degree of respiratory activity; the rates of forward pumping by the scaphognathites exceeded 90/minute, reversal incidence was less than five reversals/10 minute and heart rate was constant. Subsequently both the heart rate and the forward pumping rates of the scaphognathites declined, incidence of reversals increased and spontaneous pauses by the heart and scaphognathites began to occur. Eventually one scaphognathite ceased pumping for prolonged periods. Possible roles for reversals, pauses and unilateral pumping are discussed.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.