- 1.
Within a few hours of the lobsters being placed in the experimental chamber in normoxic water (Po2, 130-135 mmHg), their heart rate, oxygen uptake (Vo2) and ventilation volume (Vu) were relatively high. The scaphognathites were simultaneously active on both sides (bilateral ventilation) for 50% of the time, active on one side only (unilateral ventilation) for 32% of the time and simultaneously inactive (respiratory pause) for 18% of the time. Percentage extraction of O2 (% Ext.) was relatively low. 48h after having been set up, heart rate, VO2 and Vg had decreased significantly, % Ext. had increased and bilateral ventilation occupied 25% of the time. Heart rate was low and the beat irregular.
- 2.
Upon subsequent exposure to hypoxia (PO2, 50-55 mmHg), Pa, O2, fell, there was initial hyperventilation, bilateral ventilation for 89% of the time, heart beat was more regular but Vo2 did not change significantly. An initial increase in pHa caused the O2 affinity of the Hey to rise. After 72h exposure to hypoxia Vg and pHa had declined, but Vg was still higher than at the end of the period of normoxia. Blood lactate, Vo2 and % Ext. were not significantly different from the values recorded after 48 h in normoxic water. Upon return to normoxic water, Vg and the time the animals spent ventilating both branchial chambers fell, but Vo2 increased.
- 3.
It is concluded that for settled lobsters, Vo2 could be maintained during moderate hypoxia by increasing Vg maintaining a regular heart beat, and at least initially by increasing the O2 affinity of the Hey.
Celebrating 100 years of discovery
We are proud to be celebrating 100 years of discovery in Journal of Experimental Biology. Visit our centenary webpage to find out more about how we are marking this historic milestone.
Craig Franklin launches our centenary celebrations
Editor-in-Chief Craig Franklin reflects on 100 years of JEB and looks forward to our centenary celebrations, including a supplementary special issue, a new early-career researcher interview series and the launch of our latest funding initiatives.
Looking back on the first issue of JEB
Journal of Experimental Biology launched in 1923 as The British Journal of Experimental Biology. As we celebrate our centenary, we look back at that first issue and the zoologists publishing their work in the new journal.
Webinar: Increasing the visibility and impact of your research
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Would you like to increase the visibility and impact of your research and raise your profile internationally? If so, register for the very practical webinar we are running in association with HUBS on 23 February 2023.
Biology Communication Workshop: Engaging the world in the excitement of research
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We are delighted to be sponsoring a Biology Communication Workshop for early-career researchers as part of JEB’s centenary celebrations. The workshop focuses on how to effectively communicate your science to other researchers and the public and takes place the day before the CSZ annual meeting, on 14 May 2023. Find out more and apply here.
Mexican fruit flies wave for distraction
Dinesh Rao and colleagues have discovered that Mexican fruit flies vanish in a blur in the eyes of predatory spiders when they wave their wings at the arachnids, buying the flies time to make their escape.
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