Advanced

Distinctive diffusive properties of swimming planktonic copepods in different environmental conditions

Pastore, Raffaele ; Uttieri, Marco ; Bianco, Giuseppe LU ; Ribera d’Alcalá, Maurizio and Mazzocchi, Maria Grazia (2018) In European Physical Journal E 41(6).
Abstract

Abstract.: Suspensions of small planktonic copepods represent a special category in the realm of active matter, as their size falls within the range of colloids, while their motion is so complex that it cannot be rationalized according to basic models of self-propelled particles. Indeed, the wide range of individual variability and swimming patterns resemble the behaviour of much larger animals. By analysing hundreds of three-dimensional trajectories of the planktonic copepod Clausocalanus furcatus, we investigate the possibility of detecting how the motion of this species is affected by different external conditions, such as the presence of food and the effect of gravity. While this goal is hardly achievable by direct inspection of... (More)

Abstract.: Suspensions of small planktonic copepods represent a special category in the realm of active matter, as their size falls within the range of colloids, while their motion is so complex that it cannot be rationalized according to basic models of self-propelled particles. Indeed, the wide range of individual variability and swimming patterns resemble the behaviour of much larger animals. By analysing hundreds of three-dimensional trajectories of the planktonic copepod Clausocalanus furcatus, we investigate the possibility of detecting how the motion of this species is affected by different external conditions, such as the presence of food and the effect of gravity. While this goal is hardly achievable by direct inspection of single organism trajectories, we show that this is possible by focussing on simple average metrics commonly used to characterize colloidal suspensions, such as the mean square displacement and the dynamic correlation functions. We find that the presence of food leads to the onset of a clear localization that separates a short-time ballistic from a long-time diffusive regime. Such a benchmark reflects the tendency of C. furcatus to remain temporally feeding in a limited space and disappears when food is absent. Localization is clearly evident in the horizontal plane, but is negligible in the vertical direction, due to the effect of gravity. Our results suggest that simple average descriptors may provide concise and useful information on the swimming properties of planktonic copepods, even though single organism behaviour is strongly heterogeneous. Graphical abstract: [Figure not available: see fulltext.].

(Less)
Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Topical issue: Fluids and Structures: Multi-scale coupling and modeling
in
European Physical Journal E
volume
41
issue
6
article number
79
publisher
Springer
external identifiers
  • pmid:29934856
  • scopus:85049323217
ISSN
1292-8941
DOI
10.1140/epje/i2018-11688-5
project
Centre for Animal Movement Research
language
English
LU publication?
yes
id
150f219e-d2d5-4d6f-96a3-98f5caa9c990
date added to LUP
2018-07-16 12:25:14
date last changed
2020-09-23 07:08:09
@article{150f219e-d2d5-4d6f-96a3-98f5caa9c990,
  abstract     = {<p>Abstract.: Suspensions of small planktonic copepods represent a special category in the realm of active matter, as their size falls within the range of colloids, while their motion is so complex that it cannot be rationalized according to basic models of self-propelled particles. Indeed, the wide range of individual variability and swimming patterns resemble the behaviour of much larger animals. By analysing hundreds of three-dimensional trajectories of the planktonic copepod Clausocalanus furcatus, we investigate the possibility of detecting how the motion of this species is affected by different external conditions, such as the presence of food and the effect of gravity. While this goal is hardly achievable by direct inspection of single organism trajectories, we show that this is possible by focussing on simple average metrics commonly used to characterize colloidal suspensions, such as the mean square displacement and the dynamic correlation functions. We find that the presence of food leads to the onset of a clear localization that separates a short-time ballistic from a long-time diffusive regime. Such a benchmark reflects the tendency of C. furcatus to remain temporally feeding in a limited space and disappears when food is absent. Localization is clearly evident in the horizontal plane, but is negligible in the vertical direction, due to the effect of gravity. Our results suggest that simple average descriptors may provide concise and useful information on the swimming properties of planktonic copepods, even though single organism behaviour is strongly heterogeneous. Graphical abstract: [Figure not available: see fulltext.].</p>},
  author       = {Pastore, Raffaele and Uttieri, Marco and Bianco, Giuseppe and Ribera d’Alcalá, Maurizio and Mazzocchi, Maria Grazia},
  issn         = {1292-8941},
  language     = {eng},
  month        = {06},
  number       = {6},
  publisher    = {Springer},
  series       = {European Physical Journal E},
  title        = {Distinctive diffusive properties of swimming planktonic copepods in different environmental conditions},
  url          = {http://dx.doi.org/10.1140/epje/i2018-11688-5},
  doi          = {10.1140/epje/i2018-11688-5},
  volume       = {41},
  year         = {2018},
}