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- Title
On the role of sea surface temperature on the spatial distribution of early stages of mackerel using inertiograms.
- Authors
Bez, Nicolas; Rivoirard, Jacques
- Abstract
From a statistical point of view, the relationship between larval density and a physical parameter such as temperature can be described by a regression. Density is then considered as a response to temperature, but the regression depends on the domain (for instance favourable temperatures may extend beyond areas where larvae are present). An alternative approach starts with the individual larva and looks at the associated parameter. The relative abundance per class of parameter gives the probability distribution of the parameter per individual, with its mean (centre of gravity) and variance (inertia). The regression or the distribution of the parameter per individual is often bell-shaped, indicating a maximum. However, this may be caused by the gregarious behaviour of the larvae, onto a relatively smooth parameter field rather than by an actual link between the variables. To answer this question, the spatial context can be used: in case of an actual association, this association is expected to get weaker when moving the population as a whole on the parameter field, resulting in an increase in the inertia of the parameter (inertiogram). The method is illustrated for Western mackerel egg and larval distributions observed during the ICES triennial surveys in 1989. It is shown that, along the shelf edge, (the inertia of) temperature is conditioning the latitudinal extension of the larval populations.
- Subjects
LARVAE; TEMPERATURE; SEA surface microlayer; SPECIES distribution; FISHERIES; MARINE science research
- Publication
ICES Journal of Marine Science / Journal du Conseil, 2000, Vol 57, Issue 2, p383
- ISSN
1054-3139
- Publication type
Article
- DOI
10.1006/jmsc.2000.0644