Both Light Stimuli and Predation Risk Affect the Adult Behavior of a Stygobiont Crustacean

Galbiati, Matteo; Lapadula, Stefano; Forlani, Martina; Barzaghi, Benedetta; Manenti, Raoul

doi:10.3390/d15020290

Cited by 3 publications

(1 citation statement)

References 52 publications

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“…IN these ecosystems, animals are adapted to the light deprived nature of caves, and become less adapt at surviving in above ground territories. Past studies have found that cave adapted insects and fish exhibit agitation and increased activity when stimulated by light, and tend to retreat to dark conditions, behaviors termed photophobia or photokinesis [27,[55][56][57][58][59][60][61].…”

Section: Light Photokinesis Provides An Adaptive Behavior For Avoidin...mentioning

confidence: 99%

Evolution of a central dopamine circuit underlies adaptation of light-evoked sensorimotor response in the blind cavefish,Astyanax mexicanus

Kozol,

Canavan,

Tolentino

et al. 2024

Preprint

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Adaptive behaviors emerge in novel environments through functional changes in neural circuits. While relationships between circuit function and behavior have been well studied, how evolution shapes those circuits and leads to behavioral adpation is poorly understood. The Mexican cavefish, Astyanax mexicanus, provides a unique genetically amendable model system, equipped with above ground eyed surface fish and multiple evolutionarily divergent populations of blind cavefish that have evolved in complete darkness. These differences in environment and vision provide an opprotunity to examine how a neural circuit is functionally influenced by the presence of light. Here, we examine differences in the detection, and behavioral response induced by non visual light reception. Both populations exhibit photokinetic behavior, with surface fish becoming hyperactive following sudden darkness and cavefish becoming hyperactive following sudden illumination. To define these photokinetic neural circuits, we integrated whole brain functional imaging with our Astyanax brain atlas for surface and cavefish responding to light changes. We identified the caudal posterior tuberculum as the central modulator for both light or dark stimulated photokinesis. To unconver how spatiotemporal neuronal activity differed between surface fish and cavefish, we used stable pan-neuronal GCaMP Astyanax transgenics to show that a subpopulation of darkness sensitve neurons in surface fish are now light senstive in cavefish. Further functional analysis revealed that this integrative switch is dependent on dopmane signaling, suggesting a key role for dopamine and a highly conserved dopamine circuit in modulating the evolution of a circuit driving an essential behavior. Together, these data shed light into how neural circuits evolved to adapte to novel settings, and reveal the power of Astyanax as a model to elucidate mechanistic ingiths underlying sensory adaptation.

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Section: Light Photokinesis Provides An Adaptive Behavior For Avoidin...mentioning

confidence: 99%

Evolution of a central dopamine circuit underlies adaptation of light-evoked sensorimotor response in the blind cavefish,Astyanax mexicanus

Kozol,

Canavan,

Tolentino

et al. 2024

Preprint

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Back from the underworld: the exploitation of spring habitats by stygobiont species

Manenti,

Zampieri,

Pacinotti

et al. 2024

Hydrobiologia

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Stygobionts, namely animals with strong adaptations to subterranean environments that are unable to complete their life cycles outside groundwater, can be observed in spring ecotones, but their occurrence is generally considered accidental. The aim of this paper is to assess if stygobiont occurrence in springs is linked to specific environmental conditions or if it is random, irrespective of their features. For three years, we surveyed 59 spring sites recording the occurrence of vertebrate and invertebrate stygobiont species and assessing if spring features were related to their distribution. Moreover, we recorded the escape reactions of two easily identifiable stygobiont species. We detected six taxa usually considered as strictly stygobiont based on their troglomorphic features. Two of them were quite widespread: the salamander Proteus anguinus and the shrimp Troglocaris planinensis. Environmental characteristics were significantly related to the distribution of stygobionts. Hydroperiod and occurrence of flooding were the factors that played the strongest role in affecting occurrence. Our study suggests that the occurrence of stygobionts in springs is linked to specific habitat features rather than being a random mechanism and that the exploitation of ecotones can be important for the lifecycle of some species usually assumed to be strictly associated to caves.

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The ticking clock in the dark: Review of biological rhythms in cave invertebrates

de Souza,

Souza-Silva,

Ferreira

2024

Chronobiology International

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Both Light Stimuli and Predation Risk Affect the Adult Behavior of a Stygobiont Crustacean

Cited by 3 publications

References 52 publications

Evolution of a central dopamine circuit underlies adaptation of light-evoked sensorimotor response in the blind cavefish,Astyanax mexicanus

Evolution of a central dopamine circuit underlies adaptation of light-evoked sensorimotor response in the blind cavefish,Astyanax mexicanus

Back from the underworld: the exploitation of spring habitats by stygobiont species

The ticking clock in the dark: Review of biological rhythms in cave invertebrates

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