ABSTRACT
While temperature fluctuations pose significant challenges to the nervous system, many vital neuronal systems in poikilothermic animals function over a broad temperature range. Using the gastric mill pattern generator in the Jonah crab, we previously demonstrated that temperature-induced increases in leak conductance disrupt neuronal function and that neuropeptide modulation provides thermal protection. Here, we show that neuropeptide modulation also increases temperature robustness in Dungeness and green crabs. As in Jonah crabs, higher temperatures increased leak conductance in both species' pattern-generating lateral gastric neuron and terminated rhythmic gastric mill activity. Likewise, increasing descending modulatory projection neuron activity or neuropeptide transmitter application rescued rhythms at elevated temperatures. However, decreasing input resistance using dynamic clamp only restored the rhythm in half of the experiments. Thus, neuropeptide modulation increased temperature robustness in both species, demonstrating that neuropeptide-mediated temperature compensation is not limited to one species, although the underlying cellular compensation mechanisms may be distinct.
Footnotes
Author contributions
Conceptualization: W.S., C.S.; Methodology: W.S., C.S.; Validation: W.S., C.S.; Formal analysis: W.S., C.S.; Investigation: W.S., C.S.; Resources: W.S., C.S.; Writing - original draft: W.S.; Writing - review & editing: W.S., C.S.; Visualization: W.S., C.S.; Supervision: W.S., C.S.; Project administration: W.S.; Funding acquisition: W.S.
Funding
This work was funded by the National Science Foundation [NSF IOS-1755098 to W.S.].
Data availability
All relevant data can be found within the article.