Arrow worm ecology in Svalbard: in figures

Hey guys, below are a few figures showing the main results from my 2014 paper on the ecology of Parasagitta elegans in Svalbard waters (high Arctic). Get the full paper here

Abundance: the population had two peaks, one in July and the other in November. The youngest size cohort (0, smallest animals) made up almost all the animals in the July peak, and about half of those in the November peak. Bigger individuals (Cohorts 1 and 2) were most common in winter and in spring.

Lifespan and growth: the lifespan of this species, based on body size parameters, was estimated to be at least 3 years. Individuals were born (Cohort 0) mainly in summer (from May, where the curve begins, until August). Most length growth in all size cohorts occurred between May and June, indicating intense summer feeding.

Distribution in the water: all size cohorts were found at shallower depths in summer than in winter. Individuals may migrate up and down in the water throughout the year to position themselves where there is more food (copepods).

See paper for full results and interpretation. MPS, WP2 and WP3 indicate different types of nets used to catch animals. The MPS and WP2 were smaller in size than the WP3.

Lots of more work coming soon on the ecologies of three chaetognath species in Canadian Arctic waters – let’s see how they compare!!

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