|State University of New York College of Environmental Science and Forestry (SUNY ESF)
|Woods Hole Oceanographic Institution (WHOI BCO-DMO)
|BCO-DMO Data Manager
Cod (Gadus morhua) otoliths were collected in routine monitoring either from fisheries-dependent or fisheries-independent surveys from 1988-2017.
BCO-DMO Processing Notes:
- removed color syntax in original file
- reformatted dates into yyyy-mm-dd format
- removed empty rows
- replaced spaces with underscores in the column Casini_Batch_or_Hypoxolith_Group
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
(JPEG Image (.jpg), 55.04 KB)
nternational Council for the Exploration of the Seas (ICES) Sub-Division Map
|Internal references for different collections. Casini was a collaborator who provided otoliths from the SLU-Aqua archive. The "Casini cod" project is labeled as numbers of Batches, since the otoliths were sent in different groups, which were referred to as batches. The Hypoxolith etc. (not Casini HaV) starts at the row where Caini_Batch_or_hypoxolith_Group = Misc_older_collection and continues down.
|International Council for the Exploration of the Seas Sub-Division: fishing areas. As shown on the map in the description
|Calendar Date of Capture of the fish specimen
|Year of Capture of the fish specimen in YYYY format
|Total length of the fish
|Weight of the fish
|Fulton's K is a condition index: K = W/(L^3) x 1E6; where W = weight and L = length
|The ID for a particular otolith
|Date of chemical analysis in yyyy-mm-dd format
|The year class assigned to the individual fish; based on KL chemical age determination in yyyy format
Description from NSF award abstract:
Hypoxia occurs when dissolved oxygen concentrations in aquatic habitats drop below levels required by living organisms. The increased frequency, duration and intensity of hypoxia events worldwide have led to impaired health and functioning of marine and freshwater ecosystems. Although the potential impacts of hypoxic exposure are severe, there is little known about the consequences of systemic, sub-lethal exposure to hypoxic events for populations and communities of fishes. The objective of this project is to determine whether sub-lethal exposure to hypoxia during early life stages leads to poor growth and hence increased mortality. This project will use "environmental fingerprint" methods in fish ear stones (otoliths) retrospectively to identify periods of hypoxia exposure. The project will compare consequences of hypoxia exposure in different fish species from the Gulf of Mexico, the Baltic Sea, and Lake Erie, thus examining the largest anthropogenic hypoxic regions in the world spanning freshwater, estuarine, and marine ecosystems.
This project will employ long-term, permanent markers incorporated into fish otoliths to identify life-long patterns of sub-lethal hypoxia exposure far beyond time spans currently achievable using molecular markers. This work will capitalize on patterns of geochemical proxies such as Mn/Ca and I/Ca incorporated into otoliths and analyzed using laser ablation inductively coupled plasma mass spectrometry to identify patterns of sub-lethal hypoxia exposure. The investigators will then determine whether exposure results in differential growth and survival patterns compared to non-exposed fish by tracking cohorts over time and identifying characteristics of survivors. Because this work involves multiple species in multiple hypoxic regions, it will allow cross-system comparisons among unique ecosystems. The results from this project will thus provide unprecedented insight into effects of hypoxia exposure in three major basins using novel biogeochemical proxies, thereby paving the way for a fuller understanding of the impacts of "dead zones" on coastal resources.