Microrheology of haemolymph plasma of the bumblebee Bombus terrestris

Author:

Lechantre Amandine12ORCID,Martinet Baptiste3ORCID,Thévenet Véronique1,Souramasing Oune-Saysavanh1,Bico José2ORCID,Abou Bérengère1

Affiliation:

1. Matière et Systèmes Complexes, UMR7057 CNRS - Université Paris Cité 1 , 75205 Paris , France

2. Physique et Mécanique des Milieux Hétérogènes, UMR7636 CNRS, ESPCI Paris, Université Paris Sciences & Lettres & Sorbonne Université 2 , 75005 Paris , France

3. Université de Mons (UMons), Research institute of Biosciences 3 , Laboratory of Zoology, Place du Parc 20, 7000 Mons , Belgium

Abstract

ABSTRACT Viscosity, which impacts the rate of haemolymph circulation and heat transfer, is one of the transport properties that affects the performance of an insect. Measuring the viscosity of insect fluids is challenging because of the small amount available per specimen. Using particle tracking microrheology, which is well suited to characterise the rheology of the fluid part of the haemolymph, we studied the plasma viscosity in the bumblebee Bombus terrestris. In a sealed geometry, the viscosity exhibits an Arrhenius dependence with temperature, with an activation energy comparable to that previously estimated in hornworm larvae. In an open to air geometry, it increases by 4–5 orders of magnitude during evaporation. Evaporation times are temperature dependent and longer than typical insect haemolymph coagulation times. Unlike standard bulk rheology, microrheology can be applied to even smaller insects, paving the way to characterise biological fluids such as pheromones, pad secretions or cuticular layers.

Funder

Clean Sky 2 Joint Undertaking

Horizon 2020

Fonds de la Recherche Scientifique

Publisher

The Company of Biologists

Subject

Insect Science,Molecular Biology,Animal Science and Zoology,Aquatic Science,Physiology,Ecology, Evolution, Behavior and Systematics

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