...Wolfgang Stein; Carola Städele 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...

... interests The authors declare no competing or financial interests. © 2023. Published by The Company of Biologists Ltd 2023 Summary: Reflections on the development of neuroethology in the Southern Cone of South America. Native species Behavior Physiology Neurons Electric fish Crab...

... was designed and tested in vitro (data not shown). Es-sgRNA1 ( Fig. 7 A) was injected together with Cas9 protein into the embryos. After in vitro hatching, about 10% of the injected embryos survived and were screened for eye phenotype ( Table 2 ). Compared with normal crab zoeae ( Fig. 7 B; Movie 1...

... traits (boldness, activity and hesitancy), agonistic behaviour and energy status (glycogen, glucose and lactate) in the swimming crab Portunus trituberculatus . The main results were as follows. (1) Boldness was significantly correlated with activity and hesitancy. Bold crabs were more likely to initiate...

... of crabs Neohelice granulata from two isolated populations exposed to different risks of avian predation. Individuals from the high-risk area proved to be more reactive to visual danger stimuli (VDS) than those from an area where predators are rare. Control experiments indicate that the response difference...

...Barry Magee; Robert W. Elwood SUMMARY Nociception allows for immediate reflex withdrawal whereas pain allows for longer-term protection via rapid learning. We examine here whether shore crabs placed within a brightly lit chamber learn to avoid one of two dark shelters when that shelter consistently...

...B. Geoff Horseman; Martin W. S. Macauley; W. Jon P. Barnes SUMMARY This paper describes a search for neurones sensitive to optic flow in the visual system of the shore crab Carcinus maenas using a procedure developed from that of Krapp and Hengstenberg. This involved determining local motion...

.... This predictably increases the temperature sensitivity of O 2 affinity,potentially hampering O 2 loading in warm, hypoxic habitats. The data demonstrate governing roles for lactate and proton ions in determining the temperature sensitivity of hemocyanin–O 2 affinity in crustaceans. Specimens of shore crabs...

...Jennifer R. A. Taylor; Jack Hebrank; William M. Kier SUMMARY Molting in crustaceans involves significant changes in the structure and function of the exoskeleton as the old cuticle is shed and a new one is secreted. The flimsy new cuticle takes several days to harden and during this time crabs rely...

...Iain J. McGaw SUMMARY Gastric evacuation and gut contraction rates were followed in the graceful crab Cancer gracilis during exposure to low salinity. Crabs were fed a radio-opaque meal and then exposed to 100% seawater (SW), 80%SW or 60%SW;passage of digesta was followed using a fluoroscope...

... perturbations, results from previous experiments may not represent natural physiological responses. The present study investigated how an osmoconforming decapod, the graceful crab Cancer gracilis , balanced the demands of physiological systems(prioritization or additivity of events) during feeding and digestion...

...Griselda Genovese; Mihaela Senek; Nicolás Ortiz; Mariana Regueira; David W. Towle; Martín Tresguerres; Carlos M. Luquet SUMMARY The effects of dopamine (DA) and dopaminergic agonists and antagonists on ion transport were studied in isolated perfused gills of the crab Chasmagnathus granulatus . DA...

...Deepani Seneviratna; H. H. Taylor SUMMARY This study examined whether the existence of hyperosmotic internal fluids in embryos of euryhaline crabs ( Hemigrapsus sexdentatus and H. crenulatus ) in dilute seawater reflects osmotic isolation due to impermeability of the egg envelope, as proposed...

... patterns. Long-lasting augmentation of the excitatory junction potentials (EJPs)quickens and strengthens the muscle response to a given motor pattern. We used the muscle gm6 of the crab Cancer pagurus to study the functional consequences and temporal dynamics of facilitation and augmentation. This stomach...

...Carlos M. Luquet; Dirk Weihrauch; Mihaela Senek; David W. Towle SUMMARY Using quantitative real-time PCR, the expression of mRNAs encoding three transport-related proteins and one putative housekeeping protein was analyzed in anterior and posterior gills of the euryhaline crab Chasmagnathus...

... crab Cancer magister balances the demands of physiological systems when they feed and digest in hypoxia. Cardiac parameters and haemolymph flow rates through each arterial system exiting the heart were measured using a pulsed-Doppler flowmeter. Scaphognathite beat frequency (ventilation rate...

...Dirk Weihrauch; Steve Morris; David W. Towle SUMMARY The excretory transport of toxic ammonia across epithelia is not fully understood. This review presents data combined with models of ammonia excretion derived from studies on decapod crabs, with a view to providing new impetus to investigation...

...Dirk Weihrauch; John Campbell McNamara; David W. Towle; Horst Onken SUMMARY The present investigation examined the microanatomy and mRNA expression and activity of ion-motive ATPases, in anterior and posterior gills of a South American, true freshwater crab, Dilocarcinus pagei . Like diadromous...

... by both locally released and circulating substances. In some species, including chelate lobsters and freshwater crayfish, the release zones for hormones are located both intrinsically to and at some distance from the STNS. In other crustaceans, including Brachyuran crabs, the existence of extrinsic sites...

...Oleg Gusev; Hideki Ikeda; Tetsushi Okochi; Jae Min Lee; Masatsugu Hatakeyama; Chiyoko Kobayashi; Kiyokazu Agata; Hidenori Yamada; Masayuki Saigusa SUMMARY The egg attachment system of an estuarine crab Sesarma haematocheir is formed on the maternal ovigerous hairs just after egg laying, and slips...