Exploring the effects of plastic ingestion on the energy budget Effects of plastic ingestion on the life cycle of an endangered sea turtle Nina Marn Marko Jusup Tarzan Legovi ć Bas ID: 616127
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nina.marn@gmail.com
Exploring the effects of plastic ingestion on the energy budget
Effects of plastic ingestion on the life cycle of an endangered sea turtle
Nina Marn, Marko Jusup, Tarzan Legović, ‘Bas’ Kooijman, Tin Klanjšček
Tromsø, 01st June 2017
Ruđer Bošković Institute,
Zagreb, CroatiaSlide2
Motivationyearly production of plastic: 230 mil.tonsyearly consumption: 100kg/capita
–> 140kg/c (2015)
growth in plastic production 1950-2009
source: P. Kershaw, S. Katsuhiko, S. Lee, J. Samseth, D. Woodring. UNEP year book 2011,Maarten Vanden EyndeSlide3
100 milions tons of plastics in the ocean around 80% marine debris is plastic
MotivationSlide4
Motivation
almost 300 marine species affected
?Slide5
Loggerhead sea turtles
long lived, migratory
hard to study; vulnerable to
environmental and
anthropogenic pressures
endangeredSlide6
Loggerhead sea turtles
long lived, migratory
hard to study; vulnerable to
environmental and
anthropogenic pressures
endangered
www.5gyres.orgSlide7
Loggerhead sea turtles
long lived, migratory
hard to study; vulnerable to
environmental and
anthropogenic pressures
endangered
www.5gyres.orgSlide8
Making best use of existing data
Dynamic Energy Budget (DEB) theory
knowledge about the species (data)
knowledge about processes (theory)
pars estimat.
Parameter estimates
Model predictions
Marn et al., (2017) Mar. Environ. Res.Slide9
Plastic ingestion
Synthesizing units (SUs)
Assimilation units (AUs)
Kooijman (1998), Biophys. Chem.Slide10
Plastic ingestion
Synthesizing units (SUs)
Assimilation units (AUs)Busy or freeSlide11Slide12
Plastic ingestion
Synthesizing units (SUs)
Assimilation units (AUs)Busy or freeSlide13Slide14
Plastic ingestionSlide15
Plastic lowers the scaled
functional response
Plastic ingestionSlide16
Plastic dilutes the foodSlide17
More plastic, or plastic staying longer
f =0.81
f =0.75
f =0.61
f =0.75
f =0.81
f =0.61Slide18
Same pattern as lower food availability
slower maturation and lower reproduction
quantified
slower growth and smaller size of adults quantifiedSlide19
How much plastic?Depends on the amount and residence timeat 14 % reproduction not likelySlide20
How much plastic?Depends on the amount and residence timeat 14 % reproduction not likely
Longer residence time = more plasticat 3 % puberty not reachedSlide21
mechanistic models plastic wastelower food availability could lead to population declineboth residence time and
amount of plastics in the gut need to be taken into accounteducation and better waste management necessary
Conclusions
Hawaii
photo by: Rick LoomisSlide22
Thank you!
Questions?