Preying on commercial Wsheries and accumulating paralytic shellWsh toxins: a dietary analysis of invasive Dosidicus gigas (Cephalopoda Ommastrephidae) stranded in PaciWc Canada
نویسندگان
چکیده
In fall of 2009, several mass strandings of Humboldt squid (Dosidicus gigas) occurred on Vancouver Island (49°7 60N 125°54 0W). Morphological dissections coupled with DNA barcoding of stomach contents revealed Sardinops sagax (PaciWc sardine) and Clupea pallasii (PaciWc herring) as their primary prey. Plastic nurdles, Wshing line, bull kelp, eelgrass, and a guillemot feather were also discovered. The primary prey, PaciWc sardines and PaciWc herring, are known to bioaccumulate paralytic shellWsh toxins (PSTs); additionally, both PSTs and domoic acid (DA) have been implicated in other mass strandings. Therefore, stomach contents, and other tissues when possible, were tested for PSTs and DA. Testing revealed DA concentrations below regulatory guidance levels for human consumption, yet PSTs were well in excess. Though we cannot conclude that PSTs were the deWnitive cause of the strandings, our Wndings are the Wrst report of PSTs in D. gigas.
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