Species distribution Environmental factors distribution Correlation No mechanistic link Macoma balthica Abra alba Degraer et al 2008 Hypothesis bivalves growth and survival depends on TSM ID: 359384
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Slide1Slide2
Introduction
Species distribution+Environmental factors distribution
Correlation
No mechanistic link
Macoma
balthica
Abra alba
Degraer
et al. 2008
Hypothesis: bivalves growth and survival depends on TSM Slide3
The bigger the organs the better their function
TSM
Food for bivalves: algae + detritus
G
radient in the BCS
Palps
Compton
et al
. 2007
© Barbara HarmonSlide4
Hypothesis and conceptual model
Hypothesis:
bivalve communities in the
BCS are structured by food availability and quality, and the traits
determining the fittest species are gills and palps
masses. Slide5
Bivalves model equations
(
Filgueira
et al.
2008)
(
Prins et al. 1991,
Kiorboe et al.1981)
Slide6
Measuring traits - Methods
Campaign on board
Belgica
In the labBurned in the muffle furnace at 500° C for 4 hours
Weighted to the
0.1 mg
dissection of gills and palps within the 24 h8 m beam trawl on several transectsSlide7
Measurements results
Remote sensing TSM (g m
-3
)
Slide8
Measurements results
Compton
et al
. 2007Slide9
Palp
: 4.3 mgGill/palp : 2.9
Measurements results
2
1
Palp
: 5.9 mg
Gill/
palp : 2.4Remote sensing TSM (g m-3)Slide10
Preliminary model resultsSlide11
Preliminary model resultsSlide12
Data show that in the BCS gills and
palps masses respond to TSM and food concentration in line with our hypothesisSize of the feeding apparatus (gills+palps) seems to play a role (feeding time)
Lack of parameters for model ratesPhysiological plasticity to adapt to different conditions can widen the range of values for the traits.
Final thoughts
For the future
Refine model parameters, also through experiments that measure the rates
Extend the measurements to more conditions and species
To summarize: Improve the modelSlide13
Acknowledgments
TRIPS. Assessing macrobenthos adaptation with a trait-based model in the Southern bight of the North Sea
Thank you for your attention!