The effects of temperature on the proxies of visual detection of Danio rerio larvae: observations from the optic tectum.

Biology Open
Ewa BabkiewiczZ Maciej Gliwicz

Abstract

Numerous studies have indicated that temperature improves the visual capabilities of different ectotherms, including a variety of fish species. However, none of these studies has directly tested whether elevated temperature extends the visual detection distance - the distance from which a visual stimulus is detected. To test this hypothesis, we investigated the effect of temperature on the visual detection distance of zebrafish (Danio rerio) larvae by measuring the largest distance from a moving target that induced a neural response in the optic tectum. We applied advanced methods of functional calcium imaging such as selective plane illumination microscopy in combination with a miniature OLED screen. The screen displayed an artificial, mobile prey, appearing in the visual field of the larvae. We performed experiments in three temperature treatments (18, 23 and 28°C) on transgenic fish expressing a fluorescent probe (GCaMP5G) that changes intensity in response to altered Ca2+ concentrations in the nerves in the optic tectum. Based on the obtained data, we also measured three additional parameters of the neural response in the optic tectum, each being a proxy of sensitivity to changes in the stimulus movement. We did not confirm...Continue Reading

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Methods Mentioned

BETA
transgenic
light scattering
light sheet
Fluorescence Microscopy

Software Mentioned

ZEN
MatLab
SPSS Statistics
Python
ZEISS Lightsheet
ZEISS
TIBCO Statistica
Arduino UNO

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