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Hypoxia impairs visual acuity in snapper (Pagrus auratus)
- Source :
- Journal of Comparative Physiology A. 199:611-617
- Publication Year :
- 2013
- Publisher :
- Springer Science and Business Media LLC, 2013.
-
Abstract
- We investigated the effect of environmental hypoxia on vision in snapper (Pagrus auratus). Juvenile snapper inhabit estuarine environments where oxygen conditions fluctuate on a seasonal basis. Optomotor experiments demonstrated that visual acuity is impaired by environmental hypoxia, but not until levels approach the critical oxygen tension (Pcrit) of this species (around 25 % air-saturated seawater). In 100, 80, and 60 % air-saturated seawater, a positive optomotor response was present at a minimum separable angle (MSA) of 1°. In 40 % air-saturated seawater, vision was partially impaired with positive responses at MSAs of 2° and above. However, in 25 % air-saturated seawater, visual acuity was seriously impaired, with positive responses only present at MSAs of 6° and above. Snapper were found to possess a choroid rete, facilitating the maintenance of high ocular oxygen partial pressures (PO2) during normoxia and moderate hypoxia (PO2, between 269 and 290 mmHg). However, at 40 and 25 % water oxygen saturation, ocular PO2 was reduced to below 175 mmHg, which is perhaps linked to impairment of visual acuity in these conditions. The ability to preserve visual function during moderate hypoxia is beneficial for the maintenance of a visual lifestyle in the fluctuating oxygen environments of estuaries.
- Subjects :
- Visual acuity
genetic structures
Physiology
Visual Acuity
chemistry.chemical_element
Eye
Oxygen
Perceptual Disorders
Behavioral Neuroscience
medicine
Animals
Juvenile
Visual Pathways
Hypoxia
Ecology, Evolution, Behavior and Systematics
Oxygen saturation (medicine)
biology
Ecology
Fishes
Hypoxia (environmental)
Optic Nerve
Pagrus
biology.organism_classification
eye diseases
Oxygen tension
chemistry
Optomotor response
Animal Science and Zoology
medicine.symptom
Optometry
Subjects
Details
- ISSN :
- 14321351 and 03407594
- Volume :
- 199
- Database :
- OpenAIRE
- Journal :
- Journal of Comparative Physiology A
- Accession number :
- edsair.doi.dedup.....7be5c7d8cda18b4ed8c11fd67a149870