Blog posts by Larval fish in environmental gradients

Do fish larvae control their own destiny?

(Written by Nadia Fouzai) Figure1. Schematic overview of the computer model describing basic environmental gradients, with vertical temperature and light gradients, variable food distribution and predation risk. Yellow arrows indicate larval movement in the water ... Read more

Larval fish in environmental gradients

This blog focuses on early life history evolution, behavioural ecology of larval fish and how do survival and recruitment success of larvae relate to oceanographic conditions?

Fish larvae are pelagic organisms that hatch and develop in a widely variable environment. Biotic and abiotic marine environmental parameters like temperature, light, food and predators density change rapidly on the water column.

This change is usually accompanied by changes in larval fish growth and survivorship. Larval behavioural responses to the environmental variables like light, food availability and predation risk can modify the ratio between growth and mortality.

Indeed, by adjusting their swimming speed and habitat selection, larvae can balance their feeding and predation avoidance and can modify the ratio between growth and mortality.

About Nadia Fouzai:

I am working to gain a PhD in quantitative evolutionary marine ecology within the Theoretical Ecology Group at the University of Bergen, in conjunction with NorMER (The Nordic Centre for Research on Marine Ecosystems and Resources under Climate Change).

I am interested in early life history evolution and behavioural ecology of larval fish under global climate change. Currently I'm using theoretical models to investigate climate effects on Atlantic cod larvae.

My PhD project focuses on larval cod in environmental gradients: how do recruitment success relate to oceanographic conditions?

The aim is to develop theoretical models of larval cod growth and survival in scenarios of future oceanographic conditions.

The key research question is how recruitment success of larval cod will depend upon changes in environmental and ecological gradients such as ocean temperature, alkalinity, primary production, optics and prey availability.

Particular attention will be given to changes in vertical environmental gradients and behavioural strategies as well as horizontal patterns and drift.

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