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Marine Biology

, 164:79 | Cite as

Attachment capacity of the sea urchin Paracentrotus lividus in a range of seawater velocities in relation to test morphology and tube foot mechanical properties

  • Mishal Cohen-Rengifo
  • Claire Moureaux
  • Philippe Dubois
  • Patrick Flammang
Original paper

Abstract

Intertidal rocky shores are stressful environments where benthic invertebrates experience large wave-induced hydrodynamic forces that can detach them from the substratum. The tube feet of echinoids counteract these forces and help them remain securely affixed. Sea urchins display a high degree of phenotypic plasticity which may help them cope with hydrodynamic stress. We evaluated whether habitats presenting different seawater velocities induce plastic responses in the attachment capacity of the sea urchin Paracentrotus lividus by quantifying their morphology and the adhesive and mechanical properties of their tube feet. Intertidal adult sea urchins from three subpopulations were collected around the Crozon peninsula (France). Localities differed according to measured water velocities. Size was significantly lower in the two most exposed sites where sea urchins also presented a higher density of tube feet. Tube foot adhesive properties were not significantly different between sites, but their extensibility and toughness were significantly higher in individuals from the most exposed site. Using this information, we calculated a safety factor to predict the flow velocity that would cause detachment from the substratum. It showed individuals from the most exposed habitat would resist higher flow velocities (up to 7.59 ± 0.90 m s−1). Both morphometry and tube foot mechanical properties vary among subpopulations and show an intraspecific plasticity in P. lividus. Although, differences in sea water velocity may be one cause of this intraspecific variation, it likely results from a combination of biotic and abiotic factors.

Keywords

Acoustic Doppler Velocimeter Attachment Force Intertidal Rocky Shore Fractional Weight Loss Global Tenacity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

σ

Stress

Δl

Extension

ε

Strain

µ

Dynamic viscosity

ρ

Density

ADV

Acoustic Doppler velocimeter

ANOVA

Analysis of variance

CC

Cap de la Chèvre

Cd

Drag coefficient

Cl

Lift coefficient

Fd

Disk detachment force

Fg

Global detachment force

Fhydro

Hydrodynamic force

Fmax

Maximal attachment force

Ft

Traction force

FWL

Fractional weight loss

IL

Illien

I

Length

lo

Initial length

L

Sea urchin length (test diameter with spines)

MO

Morgat

PS

Polystyrene

PVC

Polyvinyl chloride

Re

Reynolds number

SCT

Cross-sectional surface area of the stem connective tissue layer

Sd

Disk adhesive surface

SF

Safety factor

Sg

Global adhesive surface area

Spl

Planform projected surface area

Spr

Profile projected surface area

SHOM

French National Hydrographic Service

t

Temperature

T

Tenacity

TF

Number of adoral tube feet

Td

Disk tenacity

Tg

Global tenacity

u

Water velocity

UV

Ultraviolet

Notes

Acknowledgements

M. Cohen and C. Moureaux are holders of Belgian FRIA - Fund for Research in Industry and Agriculture PhD fellowships. Ph. Dubois and P. Flammang are Research Directors of the National Fund for Scientific Research (FRS-FNRS, Belgium). The study was supported by an ARES—Research and Higher Education Academy doctoral grant. We thank M. Bauwens and Ph. Pernet for their contributions in conducting the field work, M. Collard for her advices and unconditional assistance, S. MZoudi, M. Bauwens and Th. Dupont and for their valuable technical support in the laboratory. We thank the editor and two reviewers for their useful and constructive feedback on the manuscript.

Compliance with ethical standards

Conflict of interest

All authors declare they have no conflict of interest.

Ethical approval

Animals used in our experiments were maintained and treated in compliance with the guidelines specified by the Belgian Ministry of Trade and Agriculture for the care and use of animals.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Laboratoire de Biologie des Organismes Marins et Biomimétisme, Institut des BiosciencesUniversité de MonsMonsBelgium
  2. 2.Laboratoire de Biologie Marine, (CP160/15)Université Libre de BruxellesBrusselsBelgium

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