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Southeast Fisheries Science Center
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Miami
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33149
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Hohn, Aleta
252-728-8797
252-728-8784
101 Pivers Island Road
Beaufort
NC
28156
aleta.hohn@noaa.gov
https://scholar.google.com/citations?user=wd1SXSQAAAAJ
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Aleta Hohn Google Scholar Page
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2024-02-29T00:00:00
ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data
ISO 19115-2:2009(E)
Using the otolith sulcus to aid in prey identification and improve estimates of prey size in diet studies of a piscivorous predator
1999
creation
2020-01
revision
2020
publication
NOAA/NMFS/EDM
58439
https://www.fisheries.noaa.gov/inport/item/58439
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Diet studies are fundamental for understanding trophic connections in marine ecosystems. In the southeastern US, the common bottlenose dolphin Tursiops truncatus is the predominant marine mammal in coastal waters, but its role as a top predator has received little attention. Diet studies of piscivorous predators, like bottlenose dolphins, start with assessing prey otoliths recovered from stomachs or feces, but digestive erosion hampers species identification and underestimates fish weight (FW). To compensate, FW is often estimated from the least affected otoliths and scaled to other otoliths, which also introduces bias. The ulcus, an otolith surface feature, has a species-specific shape of its ostium and caudal extents, which is within the otolith edge for some species. We explored whether the sulcus could improve species identification and estimation of prey size using a case study of four sciaenid species targeted by fisheries and bottlenose dolphins in North Carolina. Methods were assessed first on otoliths from a reference collection (n=421) and applied to prey otoliths (n=5308) recovered from 20 stomachs of dead stranded dolphins. We demonstrated in reference collection otoliths that cauda to sulcus length (CL:SL) could discriminate between spotted seatrout (Cynoscion nebulosus) and weakfish (Cynoscion regalis) (classification accuracy=0.98). This method confirmed for the first time predation of spotted seatrout by bottlenose dolphins in North Carolina. Using predictive models developed from reference collection otoliths, we provided evidence that digestion affects otolith length more than sulcus or cauda length, making the latter better predictors. Lastly, we explored scenarios of calculating total consumed biomass across degrees of digestion. A suggested approach was for the least digested otoliths to be scaled to other otoliths iteratively from within the same stomach, month, or season as samples allow. Using the otolith sulcus helped overcome challenges of species identification and fish-size estimation, indicating their potential use in other diet studies.
To explore whether the sulcus could improve species identification and estimation of prey size using a case study of four sciaenid species targeted by fisheries and bottlenose dolphins in North Carolina
Barbie Byrd and Aleta Hohn
completed
Hohn, Aleta
252-728-8797
252-728-8784
101 Pivers Island Road
Beaufort
NC
28156
aleta.hohn@noaa.gov
https://scholar.google.com/citations?user=wd1SXSQAAAAJ
WWW:LINK-1.0-http--link
Aleta Hohn Google Scholar Page
Website listed for Hohn, Aleta
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custodian
notPlanned
STOMACH CONTENTS - FULLNESS
theme
NODC DATA TYPES
STOMACH CONTENTS - PREY COUNT
ANIMALS - INDIVIDUAL - STOMACH CONTENTS
BIOLOGICAL DATA
STOMACH CONTENTS - CONTENT WEIGHT
STOMACH CONTENTS - DIGESTION
STOMACH CONTENTS - PREY TAXONOMY
theme
NODC DATA TYPES
fish examination
biological
in situ
laboratory analyses
theme
NODC OBSERVATION TYPES
Coastal Waters Of North Carolina
North Atlantic Ocean
place
NODC SEA AREA NAMES
Tursiops
common bottlenose dolphin
theme
1996-2012
temporal
DOC/NOAA/NMFS/SEFSC > Southeast Fisheries Science Center, National Marine Fisheries Service, NOAA, U.S. Department of Commerce
dataCentre
Global Change Master Directory (GCMD) Data Center Keywords
2017-04-24
publication
8.5
Protected Resources Marine Mammals (Beaufort)
project
InPort
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Cite As: Southeast Fisheries Science Center, [Date of Access]: Using the otolith sulcus to aid in prey identification and improve estimates of prey size in diet studies of a piscivorous predator [Data Date Range], https://www.fisheries.noaa.gov/inport/item/58439.
NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
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Access Constraints: None
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Distribution Liability: None
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NOAA Data Management Plan (DMP)
NOAA/NMFS/EDM
58439
https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/sefsc/dmp/pdf/58439.pdf
WWW:LINK-1.0-http--link
NOAA Data Management Plan (DMP)
NOAA Data Management Plan for this record on InPort.
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crossReference
textTable
eng; US
oceans
Complete List of Authors: Byrd, Barbie; Riverside Technology, Inc, Contractor for:
Hohn, Aleta; National Marine Fisheries Service, Southeast Fisheries
Science Center, Beaufort Laboratory
Krause, Jacob; NC State University, Department of Applied
Ecology/Center for Marine Sciences and TechnologyComplete List of Authors: Byrd, Barbie; Riverside Technology, Inc, Contractor for:
Hohn, Aleta; National Marine Fisheries Service, Southeast Fisheries
Science Center, Beaufort Laboratory
Krause, Jacob; NC State University, Department of Applied
Ecology/Center for Marine Sciences and Technology
false
eng
false
Data Table
Spreadsheet
Stranded_Bottlenose_Dolphins.csv
2021-04-29
publication
Reference_Collection_Otoliths.csv
2021-04-29
publication
Otolith_Data_From_Strandings.csv
2021-04-29
publication
Byrd Hohn Krause 2020 Otolith Sulcus paper_data and data attributes
2021-04-29
publication
attributes.csv
2021-04-29
publication
Zip
Zip
Southeast Fisheries Science Center
(305)361-5761
75 Virginia Beach Drive
Miami
FL
33149
https://www.fisheries.noaa.gov/about/southeast-fisheries-science-center
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Southeast Fisheries Science Center Website
About SEFSC
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58439.zip
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Access Constraints: None | Use Constraints: Please cite appropriately