Ommastrephid squid spawning in the North Sea: oceanography, climate change and species range expansion

Barrett, Christopher J.; MacLeod, Eleanor; Oesterwind, Daniel GND; Laptikhovsky, Vladimir

The lesserflying squid (Todaropsis eblanae) and the shortfin squid (Illex coindeti) are two abundant ommastrephid from the captures of mature, mated females in summer 2016–2019 and their occurrences were compared with respective oceanographic data from international surveys to gain insight into environmental predictors of their presence throughout the North Sea. Spawning T. eblanae were found in relatively cooler and more saline waters (6–8°C, 34.2–35.1 psu) in the northern North Sea linked to the Fair Isle Current and East Shetland Atlantic Inflow, whilst spawning I. coindetii occurred across the entire North Sea (mostly at 9–10.5°C, 34.1–34.8 psu). We hypothesize that a combination of water salinity and water temperature are key factors in the spatio-temporal distribution of spawning ommastrephid squids as they define water density that is crucial for pelagic egg mass to attain neutral buoyancy.

La pota costera (Todaropsis eblanae) y la pota voladora (Illex coindetii) son dos ommastréfidos abundantes del Atlántico nororiental. La existencia de una zona de desove se ha inferido a partir de capturas de hembras maduras y copula-das durante los veranos de 2016-2019. Su presencia se ha comparado con datos oceanográficos de estudios internacionales para conocer los predictores ambientales de su presencia en el Mar del Norte. El desove de T. eblanae se halló en aguas relativamente frías y salinas (6–8°C, 34,2–35,1 psu) del norte del Mar del Norte, vinculadas a la corriente de Fair Isle y el aporte de aguas atlánticas provenientes de Este de las Shetland. El desove de I. coindetii aconteció en todo el Mar del Norte (principalmente entre los 9–10.5°C, 34,1–34.8 psu). Se sugiere que una combinación de salinidad y temperatura del agua son factores clave en la distribución espacio-temporal de los calamares ommastréfidos desovantes, ya que la densidad del agua es crucial para que las masas de huevos pelágicos alcancen una flotabilidad neutra.

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Barrett, Christopher / MacLeod, Eleanor / Oesterwind, Daniel / et al: Ommastrephid squid spawning in the North Sea: oceanography, climate change and species range expansion. 2021.

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