Pupil dilation and constriction in the skate Leucoraja erinacea in a simulated natural light field

dc.contributor.author Mäthger, Lydia M.
dc.contributor.author Bok, Michael J.
dc.contributor.author Liebich, Jan
dc.contributor.author Sicius, Lucia
dc.contributor.author Nilsson, Dan-Eric
dc.date.accessioned 2022-05-03T14:13:50Z
dc.date.available 2023-02-14T07:39:28Z
dc.date.issued 2022-02-14
dc.description Author Posting. © Company of Biologists, 2022. This article is posted here by permission of Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology 225(4), (2022): jeb243221, https://doi.org/10.1242/jeb.243221. en_US
dc.description.abstract The skate Leucoraja erinacea has an elaborately shaped pupil, whose characteristics and functions have received little attention. The goal of our study was to investigate the pupil response in relation to natural ambient light intensities. First, we took a recently developed sensory–ecological approach, which gave us a tool for creating a controlled light environment for behavioural work: during a field survey, we collected a series of calibrated natural habitat images from the perspective of the skates' eyes. From these images, we derived a vertical illumination profile using custom-written software for quantification of the environmental light field (ELF). After collecting and analysing these natural light field data, we created an illumination set-up in the laboratory, which closely simulated the natural vertical light gradient that skates experience in the wild and tested the light responsiveness – in particular the extent of dilation – of the skate pupil to controlled changes in this simulated light field. Additionally, we measured pupillary dilation and constriction speeds. Our results confirm that the skate pupil changes from nearly circular under low light to a series of small triangular apertures under bright light. A linear regression analysis showed a trend towards smaller skates having a smaller dynamic range of pupil area (dilation versus constriction ratio around 4-fold), and larger skates showing larger ranges (around 10- to 20-fold). Dilation took longer than constriction (between 30 and 45 min for dilation; less than 20 min for constriction), and there was considerable individual variation in dilation/constriction time. We discuss our findings in terms of the visual ecology of L. erinacea and consider the importance of accurately simulating natural light fields in the laboratory. en_US
dc.description.embargo 2023-02-14 en_US
dc.description.sponsorship This work was funded by a Joan Ruderman Award from the Marine Biological Laboratory to L.M.M. and a National Science Foundation REU fellowship to L.S. M.J.B. and D.-E.N. were supported by grants from the Human Frontier Science Program and the Swedish Research Council (Vetenskapsrådet). en_US
dc.identifier.citation Mäthger, L. M., Bok, M. J., Liebich, J., Sicius, L., & Nilsson, D.-E. (2022). Pupil dilation and constriction in the skate Leucoraja erinacea in a simulated natural light field. Journal of Experimental Biology, 225(4), jeb243221. en_US
dc.identifier.doi 10.1242/jeb.243221
dc.identifier.uri https://hdl.handle.net/1912/28632
dc.publisher The Company of Biologists en_US
dc.relation.uri https://doi.org/10.1242/jeb.243221
dc.subject Environmental light field en_US
dc.subject ELF en_US
dc.subject Batoid en_US
dc.subject Elasmobranch en_US
dc.subject Vision en_US
dc.title Pupil dilation and constriction in the skate Leucoraja erinacea in a simulated natural light field en_US
dc.type Article en_US
dspace.entity.type Publication
relation.isAuthorOfPublication 0e92f390-7071-4cba-a3d5-5b74b3902986
relation.isAuthorOfPublication dfd5665a-a06b-4c3f-99f8-6edbf4b6276a
relation.isAuthorOfPublication 4dba5ffc-591b-4483-b9c8-c0c34b32949e
relation.isAuthorOfPublication 5cf520b7-257a-4562-851f-cc3e255ad065
relation.isAuthorOfPublication a585953a-e0af-4af9-8d62-2f57f40489ee
relation.isAuthorOfPublication.latestForDiscovery 0e92f390-7071-4cba-a3d5-5b74b3902986
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
3.58 MB
Adobe Portable Document Format
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
1.88 KB
Item-specific license agreed upon to submission