Table of Contents

• Coverage
• Dataset Description
  • Methods & Sampling
  • Data Processing Description
  • BCO-DMO Curation Notes
  • Problem Description
• Parameters
• Deployments
• Project Information
• Funding

Randomly selected sub-samples of krill collected with the IKMT were measured for total length (Standard Length 1, SL1, Mauchline 1980) then lightly blotted with a KimWipe and then frozen in individual cryovials and placed in a  -80˚C for later measurement of wet weight and dry weight. In the laboratory, krill samples were thawed and their wet mass was measured on an analytical balance to the nearest 0.1 mg. The krill were then dried at 60ºC for 24 hours prior to re-weighing for dry mass. 

No additional data processing by the dataset authors was used to report these data before the data was submitted to BCO-DMO.

- Loaded the original author-submiteed file, NBP2205_Morphometrics.csv
- "NA" values in the original file have been set to "no data values" in schema and present as blank values ("") in the published primary data file.
- Renamed columns: Length.mm to Length_mm, WW.mg to WW_mg, DW.mg to DW_mg
- Set column types: DW_mg, Latitude, Length_mm, Longitude, WW_mg as number; KrillID as integer; Region and Station as string
- Updated column metadata with descriptions, standard name IDs, and supplied units for DW_mg, KrillID, Latitude, Length_mm, Longitude, Region, Station, WW_mg; marked Latitude and Longitude as primary parameters
- Saved the processed data file 1009232_v1_nbp2205_krill_morphometrics.csv; this file is published as the primary data file of this dataset.

NSF Award Abstract:

Antarctic krill are essential in the Southern Ocean as they support vast numbers of marine mammals, seabirds and fishes, some of which feed almost exclusively on krill. Antarctic krill also constitute a target species for industrial fisheries in the Southern Ocean. The success of Antarctic krill populations is largely determined by the ability of their young to survive the long, dark winter, where food is extremely scarce. To survive the long-dark winter, young Antarctic krill must have a high-quality diet in autumn. However, warming in certain parts of Antarctica is changing the dynamics and quality of the polar food web, resulting in a shift in the type of food available to young krill in autumn. It is not yet clear how these dynamic changes are affecting the ability of krill to survive the winter. This project aims to fill an important gap in current knowledge on an understudied stage of the Antarctic krill life cycle, the 1-year old juveniles. The results derived from this work will contribute to the development of improved bioenergetic, population and ecosystem models, and will advance current scientific understanding of this critical Antarctic species. This CAREER project's core education and outreach objectives seek to enhance education and increase diversity within STEM fields. An undergraduate course will be developed that will integrate undergraduate research and writing in way that promotes authentic scientific inquiry and analysis of original research data by the students, and that enhances their communication skills. A graduate course will be developed that will promote students' skills in communicating their own research to a non-scientific audience. Graduate students will be supported through the proposed study and will gain valuable research experience. Traditionally underserved undergraduate students will be recruited to conduct independent research under the umbrella of the larger project. Throughout each field season, the research team will maintain a weekly blog that will include short videos, photographs and text highlighting the research, as well as their experiences living and working in Antarctica. The aim of the blog will be to engage the public and increase awareness and understanding of Antarctic ecosystems and the impact of warming, and of the scientific process of research and discovery.

In this 5-year CAREER project, the investigator will use a combination of empirical and theoretical techniques to assess the effects of diet on 1-year old krill in autumn-winter. The research is centered on four hypotheses: (H1) autumn diet affects 1-year old krill physiology and condition at the onset of winter; (H2) autumn diet has an effect on winter physiology and condition of 1-year old krill under variable winter food conditions; (H3) the rate of change in physiology and condition of 1-year old krill from autumn to winter is dependent on autumn diet; and (H4) the winter energy budget of 1-year old krill will vary between years and will be dependent on autumn diet. Long-term feeding experiments and in situ sampling will be used to measure changes in the physiology and condition of krill in relation to their diet and feeding environment. Empirically-derived data will be used to develop theoretical models of growth rates and energy budgets to determine how diet will influence the overwinter survival of 1-year old krill. The research will be integrated with an education and outreach plan to (1) develop engaging undergraduate and graduate courses, (2) train and develop young scientists for careers in polar research, and (3) engage the public and increase their awareness and understanding.

This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.