Measurements and regressions of California Current prey size and hard parts and otolith morphometrics
|Author(s)||Lowry Mark S.1, Curtis K. Alexandra1, Boerger Christiana M.2, 4, Sweeney Joelle M.3, 5|
|Affiliation(s)||1 : Southwest Fisheries Science Center, NOAA Fisheries, 8901 La Jolla Shores Drive, San Diego, California 92037, USA
2 : California State University Northridge, Northridge, California, USA
3 : Moss Landing Marine Laboratories, Moss Landing, California, USA
4 : Current address: Naval Facilities Engineering Command, Southwest Environmental Division, San Diego, California, USA
5 : Current address: Seattle, Washington, USA
|Keyword(s)||predator, prey, hard part, trophic ecology, Teleostei, otolith, Cephalopoda, beak, Batoidea, Pyrosoma|
Prey hard parts are used to reconstruct species composition and prey sizes from analyses of scats or stomachs of many marine predators. Measurements of prey hard parts are often closely related to prey size, allowing estimation of lengths and weights of prey consumed. In addition, otolith morphometrics, such as length, weight, and surface area, are related to otolith survival in predator digestive tracts and may thus help predict recovery rates in scats. Measurements were taken of prey hard part dimensions, additional morphometrics for otoliths, and/or prey size (length and weight) of reference specimens for 158 prey species found in the California Current Large Marine Ecosystem (CCLME), including 137 teleosts, twelve cephalopods, two batoids, one decapod, one myxinid, and one tunicate. Regression relationships of prey size to hard part measurements, among different prey hard part measurements (e.g., otolith length to width), and among different prey size measurements (e.g., weight to length) are provided for most species to facilitate application of these data to reconstruction of predator diets in the CCLME.
|Utilisation||The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, MMTD, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.|
|Acknowledgements||Many researchers collected samples from R/Vs and from commercial catch. Special thanks to Darrin Bergen, who collected specimens as extensively as the CDFG R/V Mako allowed him to roam from San Diego in a day (some might argue farther). Joelle Sweeney contributed otoliths and corresponding length and weight data for Oncorhynchus mykiss, Sebastes jordani and Sebastes goodei. Size data and specimens for Oncorhynchus gorbuscha were provided by Steve Moffitt and Dion Oxman of Alaska Department of Fish and Game, Joe Orsi of Alaska Fisheries Science Center, and Tyler Zubkowski of Department of Fisheries and Oceans Canada. Roberta Folk, Jim Carretta, Terry Farley, Amy Betcher, Rachel Struch, Morgan Martin, and Stephanie Nehasil helped measure and weigh specimens in the lab. Digital microscope equipment and instruction were provided by Wayne Perryman and Morgan Lynn. Microgram scales for weighing otoliths were provided by Bev Macewicz, Barbara Javor, and Jeff Seminoff. Collections managers and staff provided extensive access and expertise, including Ben Frable and H. J. Walker of the Scripps Institution of Oceanography (SIO) Marine Vertebrate Collection, Linsey Sala of the SIO Pelagic Invertebrate Collection and Eric Hochberg of Santa Barbara Museum of Natural History. Christine Thacker, Rick Feeney, Jeff Seigel, and Neftali Camacho of the Natural History Museum of Los Angeles County provided otoliths from the Fitch Otolith Collection. Lynn DeWitt created the metadata XML file.|
See Methods in related publication.