{"id":1973,"date":"2021-01-06T10:25:21","date_gmt":"2021-01-06T14:25:21","guid":{"rendered":"https:\/\/www2.whoi.edu\/site\/beaufortgyre\/?page_id=1973"},"modified":"2021-08-23T09:51:08","modified_gmt":"2021-08-23T13:51:08","slug":"dispatch-16-18-years-zooplankton-time-series","status":"publish","type":"page","link":"https:\/\/www2.whoi.edu\/site\/beaufortgyre\/expeditions\/2020-expedition\/2020-dispatches\/dispatch-16-18-years-zooplankton-time-series\/","title":{"rendered":"Dispatch 16: 18 years Zooplankton time series"},"content":{"rendered":"\n\n\t

Dispatch 16: 18 years Zooplankton time series<\/h1>\n\t

John Nelson and Hayleigh Shannon<\/h3>\n

September 22, 2020<\/h3>\n

The 18-year Canada Basin zooplankton time series continues! Although the scientific focus onboard is largely physical oceanography and geochemistry, zooplankton sampling has found its place in the JOIS program.\u00a0 Zooplankton are important for nutrient recycling and transfer of energy to higher tropic levels as they form the diet of fish, seabirds, and marine mammals. Because of this important role in the food chain, changes to type and abundance has the potential to have widespread effects. By studying zooplankton in complement with water and ice properties we can gain perspective on how the community may respond to changes in their habitat. This time series has become valuable for studying how zooplankton of the Canada Basin are changing with warmer, increasingly acidic, and increasingly ice-free conditions.<\/p>\n

Aboard the Louis, zooplankton are sampled using two 150um mesh nets known as a “bongo” net from 100m deep to the surface of the ocean. The nets are equipped with a pressure sensor and flow meter which allows scientists to estimate how much water passed through the nets. Samples are preserved for different types of analysis.<\/p>\n

The JOIS zooplankton program focusses on three main topics: tracking the influx of Pacific organisms into the Basin, following how well the pteropod population is doing, and studying how zooplankton communities endemic to the Basin may be shifting in abundance and community composition.<\/p>\n

Recent results suggest that a Pacific type of the copepod, Calanus glacialis may be penetrating further into the Canada Basin than observed at the start of our time series.\u00a0 This suggests a “Pacification” of the Arctic and portend more changes to come.\u00a0\u00a0 We will use the specimens collected in 2020 to bring this earlier preliminary observation up to date.\u00a0\u00a0 Another important species of interest are the pteropods, also known as the sea butterflies, a delicate creature that propels itself through this water by flapping its ‘wings” and has a shell made out of calcium carbonate, as do clams.\u00a0 Unfortunately, the shell of the pteropod is subject to dissolution in the increasingly acidic water of the Canada Basin. Study of this organism is of high interest as a “canary in the coal mine” for ocean acidification.\u00a0 So far, our time series indicates that the size of the pteropod population has been declining since about 2007.\u00a0 Continued work on our almost 20-year time series will undoubtedly shed further light on what is going on with the zooplankton of Canada Basin and what the future may hold in these days of global warming.<\/p>\n\t\t\t\t\n\t\t\t\t\"Reading\n\t\t\t\t<\/a>\n\t\tReading the flow meters on each net. (Sarah Ann Quesnel)\n\t\t\t\t\n\t\t\t\t\"The\n\t\t\t\t<\/a>\n\t\tThe nets are lowered over the side of the ship using an A-frame. (Sarah Ann Quesnel)\n\t\t\t\t\n\t\t\t\t\"One\n\t\t\t\t<\/a>\n\t\tOne of the bongo net catches: a comb jelly. (Kim Bedard)\n\t\t\t\t\n\t\t\t\t\"copepod\"\n\t\t\t\t<\/a>\n\t\tThe copepod is one of the most common catches in the zooplankton net with up to 40% of its body being an energy-rich lipid sac. (Image from R. Hopcroft, UAF\/NOAA\/Census of Marine Life)\n\n","protected":false},"excerpt":{"rendered":"

Dispatch 16: 18 years Zooplankton time series John Nelson and Hayleigh Shannon September 22, 2020 The 18-year Canada Basin zooplankton time series continues! Although the scientific focus onboard is largely physical oceanography and geochemistry, zooplankton sampling has found its place in the JOIS program.\u00a0 Zooplankton are important for nutrient recycling and transfer of energy to…<\/p>\n","protected":false},"author":83,"featured_media":0,"parent":1814,"menu_order":16,"comment_status":"closed","ping_status":"closed","template":"tpl-sidebar.php","meta":{"advanced-sidebar-menu\/link-title":"","advanced-sidebar-menu\/exclude-page":false},"_links":{"self":[{"href":"https:\/\/www2.whoi.edu\/site\/beaufortgyre\/wp-json\/wp\/v2\/pages\/1973"}],"collection":[{"href":"https:\/\/www2.whoi.edu\/site\/beaufortgyre\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www2.whoi.edu\/site\/beaufortgyre\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www2.whoi.edu\/site\/beaufortgyre\/wp-json\/wp\/v2\/users\/83"}],"replies":[{"embeddable":true,"href":"https:\/\/www2.whoi.edu\/site\/beaufortgyre\/wp-json\/wp\/v2\/comments?post=1973"}],"version-history":[{"count":3,"href":"https:\/\/www2.whoi.edu\/site\/beaufortgyre\/wp-json\/wp\/v2\/pages\/1973\/revisions"}],"predecessor-version":[{"id":2160,"href":"https:\/\/www2.whoi.edu\/site\/beaufortgyre\/wp-json\/wp\/v2\/pages\/1973\/revisions\/2160"}],"up":[{"embeddable":true,"href":"https:\/\/www2.whoi.edu\/site\/beaufortgyre\/wp-json\/wp\/v2\/pages\/1814"}],"wp:attachment":[{"href":"https:\/\/www2.whoi.edu\/site\/beaufortgyre\/wp-json\/wp\/v2\/media?parent=1973"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}