Speaker: Rick Brodeur, NOAA Northwest Fisheries Science Center, Hatfield Marine Science Center
Topic: Causes and consequences of the great pyrosome bloom in the Northern California Current.
Pelagic urochordates (salps and appendicularians) are dominant components of oceanic, low productivity waters globally and have been studied with some regularity in many ecosystems. However, colonial pyrosomes, are generally restricted to oceanic tropical seas and have been far less studied. The subtropical species, Pyrosoma atlanticum, has priodically been sampled off Southern California. With the advent of anomalously warm conditions (Warm Blob) in the Central North Pacific in 2014, P. atlanticum started appearing north of its known latitudinal range in coastal trawl surveys off Oregon and Washington, continuing to increase dramatically for the next four years and becoming the dominant component of pelagic surveys in 2017 and 2018, but retreated to southern waters in 2019. These massive blooms impaired commercial fisheries and washed up on beaches prompting public concerns. Due to the paucity of information on this species outside its normal range, the horizontal and vertical distribution, habitat preferences, energy density, diets based on fatty acid and stable isotopic signatures, grazing rates, and utilization by higher trophic levels were examined. Since this tropical invader may become established in this productive temperate ecosystem, understanding its ecology and potential impacts to the pelagic and benthic food webs and human utilization may fill critical gaps. 3:30 pm - 4:30 pm | OSU Hatfield Marine Science Center
Thursday, January 9 at 3:30pm to 4:30pm
Hatfield Marine Science Center, Guin Library Seminar Room
2030 SE Marine Science Dr, Newport, OR 97365