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Leanne M. Duffy
Inter-American Tropical Tuna Commission
EcologyYellowfin tunaTunaFisheryBiology
21Publications
8H-index
214Citations
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Publications 21
Newest
#1John M. LoganH-Index: 15
#2Heidi Pethybridge (Hobart Corporation)H-Index: 18
Last. Brittany S. Graham (NIWA: National Institute of Water and Atmospheric Research)H-Index: 12
view all 14 authors...
Abstract A global dataset of carbon stable isotope (δ13C) values from yellowfin, bigeye, and albacore tuna muscle tissue (n = 4275) was used to develop a novel tool to infer broad-scale movement and residency patterns of these highly mobile marine predators. This tool was coupled with environmental models and lipid content (C:N ratio) of tuna muscle tissues to examine ocean warming impacts on tuna ecology and bioenergetic condition across Longhurst provinces. Over a 16-year study period (2000–20...
1 CitationsSource
#1Anne Lorrain ('IFREMER': IFREMER)H-Index: 26
#2Heidi Pethybridge (Hobart Corporation)H-Index: 18
Last. Jock W. Young (Hobart Corporation)H-Index: 27
view all 22 authors...
: Considerable uncertainty remains over how increasing atmospheric CO2 and anthropogenic climate changes are affecting open-ocean marine ecosystems from phytoplankton to top predators. Biological time series data are thus urgently needed for the world's oceans. Here, we use the carbon stable isotope composition of tuna to provide a first insight into the existence of global trends in complex ecosystem dynamics and changes in the oceanic carbon cycle. From 2000 to 2015, considerable declines in δ...
4 CitationsSource
#1Leanne M. Duffy (Inter-American Tropical Tuna Commission)H-Index: 8
#2Cleridy E. Lennert-Cody (Inter-American Tropical Tuna Commission)H-Index: 15
Last. Shane P. Griffiths (Inter-American Tropical Tuna Commission)H-Index: 2
view all 5 authors...
Abstract Ecological risk assessment (ERA), including Productivity-Susceptibility Analysis (PSA), is becoming increasingly used to assess the relative vulnerability of data-limited non-target species to the impacts by fishing. PSA was developed for the eastern Pacific Ocean (EPO) tuna purse-seine fishery to assess the vulnerability of incidentally-caught species for three set types, “dolphin sets”, “unassociated sets” and “floating-object sets”, during 2005–2013. Because of operational difference...
1 CitationsSource
2 CitationsSource
#1Leanne M. Duffy (Inter-American Tropical Tuna Commission)H-Index: 8
#2Shane P. Griffiths (Inter-American Tropical Tuna Commission)H-Index: 2
Productivity-susceptibility analysis (PSA) is a widely used data-limited method to assess the relative vulnerability of species impacted by fisheries. Despite its widespread use, few authors have evaluated the impacts of attribute weightings and correlation of productivity attributes that may bias species' vulnerability scores. We evaluated the PSA methodology and performed sensitivity analyses to determine the impacts of correlation among productivity attributes used in the PSA, given that seve...
2 CitationsSource
#1Heidi Pethybridge (CSIRO: Commonwealth Scientific and Industrial Research Organisation)H-Index: 18
#2C. Anela Choy (UCSD: University of California, San Diego)H-Index: 2
Last. Robert J. Olson (Inter-American Tropical Tuna Commission)H-Index: 19
view all 16 authors...
Aim: We examined potential environmental drivers of broad-scale spatial patterns in the trophic structure of marine ecosystems as represented by nitrogen stable isotopes in globally distributed marine predators. Additionally, we assessed the effects of spatial scale on the predictive capabilities of environmental variables. Location: Global oceans. Time period: 2000 to 2015. Major taxa studied: Tunas: Thunnus albacares, Thunnus obesus, Thunnus alalunga. Methods: We undertook a global compilation...
3 CitationsSource
#1Mary E. HunsickerH-Index: 16
#2Robert J. OlsonH-Index: 19
Last. James F. KitchellH-Index: 70
view all 6 authors...
#1Mary E. HunsickerH-Index: 16
#2Robert J. OlsonH-Index: 19
Last. James F. KitchellH-Index: 70
view all 6 authors...
#1Leanne M. Duffy (Inter-American Tropical Tuna Commission)H-Index: 8
#2Petra M. Kuhnert (CSIRO: Commonwealth Scientific and Industrial Research Organisation)H-Index: 20
Last. Frédéric Ménard (AMU: Aix-Marseille University)H-Index: 20
view all 17 authors...
Abstract Predator-prey interactions for three commercially valuable tuna species: yellowfin (Thunnus albacares), bigeye (T. obesus), and albacore (T. alalunga), collected over a 40-year period from the Pacific, Indian, and Atlantic Oceans, were used to quantitatively assess broad, macro-scale trophic patterns in pelagic ecosystems. Analysis of over 14,000 tuna stomachs, using a modified classification tree approach, revealed for the first time the global expanse of pelagic predatory fish diet an...
13 CitationsSource
#1Joel E. Van Noord (NOAA: National Oceanic and Atmospheric Administration)H-Index: 2
#2Robert J. OlsonH-Index: 48
Last. Ronald S. KaufmannH-Index: 22
view all 5 authors...
2 CitationsSource
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