Habitat and distribution of post-recruit life stages of the squid Loligo forbesii
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AuthorsSmith, J.M. (Jennifer); MacLeod, C.D. (Colin); Valavanis, V. (Vasilis); Hastie, L. (Lee); Valinassab, T. (Tooraj); Bailey, N. (Nick); Santos, M.B. (María Begoña); Pierce, G.J. (Graham John)
This study models habitat preferences of the squid Loligo forbesii through its post-recruitment life cycle in waters around Scotland (UK). Trawl survey and market sample data from 1985 to 2004 are used to model seasonal habitats of immature, maturing and mature squid (maturity being inferred from size and season). Squid presence–absence and catch rate in areas of presence were analysed using generalised additive models, relating spatiotemporal patterns of distribution and abundance to ecogeographic variables. For all maturity classes, higher abundance in winter and spring (i.e., quarters 1 and 2) was associated with deeper water while higher abundance in summer and autumn (quarters 3 and 4) was associated with shallower water, consistent with seasonal onshore-offshore migrations but suggesting that most spawning may take place in deeper waters. The preferred SST range was generally 8–8.75 °C while preferred salinity values were below 35‰ in winter and summer and above 35‰ in spring and ...