Details

Autor(en) / Beteiligte

• Fleet, Jenna L.
• Mackey, Theresa E.
• Jeffrey, Jennifer D.
• Good, Sara V.
• Jeffries, Kenneth M.
• Hasler, Caleb T.

Titel

Interindividual behavioural variation in response to elevated CO2 predicts mRNA transcript abundance of genes related to acid-base regulation in medaka (Oryzias latipes)

Ist Teil von

• Aquatic toxicology, 2024-05, Vol.270, p.106885-106885, Article 106885

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Fresh water is experiencing changes in CO2 and fish biodiversity may be at risk.•We assessed behaviour and phenotypic plasticity in medaka exposed to high CO2.•Organismal performance and transcript abundances from tissues were quantified.•CO2 had few impacts, though behavioural differences were linked to mRNA levels.•There may be CO2 ‘winners’ and ‘losers’ within freshwater fish populations. Rising carbon dioxide (CO2) in aquatic ecosystems due to climate change is a challenge for aquatic ectotherms. We examined whether interindividual variation in behavioural responses to CO2 could predict how a teleost fish would respond to elevated CO2 for multiple phenotypic and molecular traits. To this end, we first quantified behavioural responses of individuals exposed to acute elevated CO2, and used these to assign individuals as either high or low responders relative to the population mean. Subsequently, we exposed both high and low responders to elevated CO2 for 6 weeks and quantified the effect on body condition, behaviour, and mRNA transcript responses of gill and liver genes associated with relevant physiological processes. Generally, we found few relationships between the phenotypic groups and body condition and behaviour following the CO2 exposure period; however, stark differences between the phenotypic groups with respect to gene transcripts from each tissue related to various processes were found, mostly independent of CO2 exposure. The most pronounced changes were in the gill transcripts related to acid-base regulation, suggesting that the observed behavioural variation used to assign fish to phenotypic groups may have an underlying molecular origin. Should the link between behaviour and gene transcripts be shown to have a fitness advantage and be maintained across generations, interindividual variation in behavioural responses to acute CO2 exposure may be a viable and non-invasive tool to predict future population responses to elevated aquatic CO2.