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Four Stories about the Spring 2018 Cruise

Lauren Frisch, Public Information Officer for the College of Fisheries and Ocean Sciences, UAF, authored a series of four stories about our May 2018 cruise. Although these stories focus on the on-board capabilities of R/V Sikuliaq, they also include engaging descriptions of our research. Find the links to these stories below:

Sikuliaq expands ways to study Gulf of Alaska ecosystems

Russ Hopcroft at the microscope Studies of zooplankton such as copepods have expanded because of LTER funding and the workspace available aboard R/V Sikuliaq. For instance, CFOS researcher Russ Hopcroft isolates, identifies, photographs, and assesses live animals soon after net tows.
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Submarine ‘airplane’ revolutionizes measurement of seawater content

retrieval of the Acrobat off Sikuliaq's stern CFOS’s Seth Danielson operates an Acrobat instrument, which he described as the underwater version of an airplane. The Acrobat measures temperature and salinity on fine spatial scales. As a result, LTER scientists can track freshwater from the land and investigate how it mixes with ocean water.
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Sikuliaq improves analysis of phytoplankton’s nutrient needs

incubation experiments on phytoplankton CFOS’s Ana Aguilar-Islas brings her own specialized clean sampling instruments onto Sikuliaq so she can quantify nutrients like iron that are essential to phytoplankton. Additionally, Aguilar-Islas and WWU’s Suzanne Strom performed incubation experiments to study how iron availability affects plankton growth.
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Sikuliaq researchers find odd, abundant animal-plant plankton

net tows aboard the Sikuliaq Nutritional flexibility in ciliates and dinoflagellates stabilizes food chains in the Gulf of Alaska. WWU’s Suzanne Strom isolates cells and preserves them soon after they are collected, so she can analyse them at sea and in her onshore lab.
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Video of Zooplankton Sampling

Alicia Rinaldi-Schuler, a fisheries graduate student at CFOS, volunteered for NGA LTER’s Spring 2018 cruise aboard R/V Sikuliaq. Ordinarily, Alicia studies humpback whales. However, we put her to work sampling zooplankton on the night shift. She filmed the equipment they used (bongo nets, multi-net, and methot net) and the creatures they caught (squid, jellyfish, euphasiids, and fish larvae). Her engaging video summarizes of some of the research that occurs during our cruises.

Expedition Gulf of Alaska

Michele Hoffman Trotter

Our upcoming Seward Line cruise aboard the R/V Sikuliaq will include some special guests: educator and film-maker Michele Hoffman Trotter, media and education specialist Carlee Belt, and cinematographer Katherine Brennan. They have traveled all the way to Alaska to create a series of educational modules called “Expedition Gulf of Alaska: an Online STEAM Experience”. Additionally, they will be filming for “Microcosm”, a documentary project that features the diversity and roles of microscopic life in the ocean.

Michele is a Chicago based educator with 20+ years of experience in higher education and public outreach to general audiences. She met Dr. Russ Hopcroft, lead PI of the NGA LTER, aboard the USCGC Healy in the Chukchi Sea. They bonded over microscopic creatures and their shared interest in how the ocean functions as a system. At the time, Michele made a video introduction of her work on the cruise.

Educational Modules

plankton sample
Photo credit: Michele Hoffman Trotter

During the April/May 2018 Seward Line cruise, planned educational modules focus on three topics:

  • Changing Climate, Changing World
  • Biodiversity: Our Lives Depend On It
  • Plankton to Whales: How Energy Flows in the Environment

All of these modules will incorporate YouTube videos and other online material, posted daily from the ship. For example, video clips of scientific tools in use performing fieldwork will be posted. Then in the comments, students will directly question scientists about their work during the cruise.

The content targets students from grade five through twelve. As an introduction, younger students will develop a base understanding of key concepts involving the scientific method of inquiry, taxonomy, and fundamentals of ecology, chemistry, atmospheric science, and biology. Supplementary activities will give older or more advanced students chances to engage in analytical thinking. Furthermore, they will also be encouraged to apply newly acquired knowledge to contemporary scientific questions.

We are excited about the intersection between Michele’s program and the goals of the LTER Schoolyard Series. In addition to participants in Alaskan classrooms, we have participating homeschooling families in California and Illinois, and two public schools in Chicago. Additionally, approximately a dozen adults are participating in an adult education version.

View the Microcosm Teaser.

Sikuliaq Cruise, May 2018

R/V Sikuliaq

In a few short days, 23 scientists and educators will embark on our first LTER cruise aboard the R/V Sikuliaq, April 18 – May 5, 2018. Cruises are integral to our research and we anticipate having three each year – in May, July, and September. This cruise continues decades of time-series of measurements of the spring phytoplankton bloom along the Seward Line. As such, its many objectives center on the physical and biological processes that generate and sustain the spring bloom.

Scientific Purpose

This cruise continues the sampling begun in fall 1997 under the NSF/NOAA NE Pacific GLOBEC program, and supported subsequently a consortium of the North Pacific Research Board (NPRB), the Alaska Ocean Observing System (AOOS), and the Exxon Valdez Oil Spill Trustee Council’s (EVOSTC) Gulf Watch. This is the first cruise as part of the NSF’s Northern Gulf of Alaska Long-term Ecological Program (NGA-LTER). The core scientific purpose of the Seward Line project is to develop an understanding of the response and resiliency of this marine ecosystem to climate variability. This cruise marks the 21st consecutive spring cruise for the Seward Line in the NGA, including Prince William Sound (PWS), and the 48th year of observations at GAK1.

Cruise Objectives

NGA map
Map of Northern Gulf of Alaska sampling stations, 2018.
  1. Determine thermohaline, velocity, light, and oxygen structure of the NGA shelf.
  2. Determine macro- and micro-nutrient structure of the NGA shelf.
  3. Determine particle structure and flux rates of the NGA shelf.
  4. Determine phyto- and microzooplankton composition, biomass distribution, and productivity.
  5. Determine the vertical and horizontal distribution and abundance of zooplankton species (including macro-jellies).
  6. Record multi-frequency acoustics for estimation of nekton
  7. Conduct surveys of seabirds and Marine Mammals
  8. Conduct shipboard experimental work on phyto- and zooplankton.
  9. Determine carbonate chemistry (i.e. Ocean Acidification) at selected stations
  10. Recover and redeploy the GAK1 mooring. Drag for lost mooring at GAK 4 and Gak8i.
  11. Provide at-sea experience for UAF students.
  12. Share the experience through outreach/media activities.

Sampling Plan

To achieve the objectives, the cruise will visit four cross-shelf transect lines plus stations within Prince William Sound. At each station, operations will be divided into day and night tasks. In the day, we will perform CTD measurements, bottle sampling, and perform intensive sampling and productivity experiments at selected locations. At night, net tows for zooplankton will catch the critters when they rise in the water column to feed. The shortness of high latitude nights in May will mean more daylight work than nighttime work.