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Body size affects the vertical movement of benthic amphipods through subsurface sediments in response to drying

Patel, C. ; Vadher, A. N. ; Mathers, K. L. ; Dwyer, C. LU and Wood, P. J. (2021) In Hydrobiologia 848(5). p.1015-1025
Abstract

This study aimed to experimentally examine how riverbed drying and different rates of water level reduction influenced the vertical movement of amphipods of various sizes into different subsurface sediment compositions. Using sediment columns (mesocosms) filled with different sized transparent substrates, we explored how varying speeds of drawdown affected vertical movement and stranding of individuals. We hypothesised that: (1) larger individuals would be less able to migrate within subsurface sediments compared to smaller ones; (2) smaller sediment particles would lead to more individuals becoming stranded and; (3) faster rates of water level drawdown would increase the likelihood of individuals becoming stranded above the waterline.... (More)

This study aimed to experimentally examine how riverbed drying and different rates of water level reduction influenced the vertical movement of amphipods of various sizes into different subsurface sediment compositions. Using sediment columns (mesocosms) filled with different sized transparent substrates, we explored how varying speeds of drawdown affected vertical movement and stranding of individuals. We hypothesised that: (1) larger individuals would be less able to migrate within subsurface sediments compared to smaller ones; (2) smaller sediment particles would lead to more individuals becoming stranded and; (3) faster rates of water level drawdown would increase the likelihood of individuals becoming stranded above the waterline. Body size significantly influenced the final position of an individual, with smaller individuals accessing deeper sediments more readily. Larger amphipods were more likely to become stranded above the waterline. Amphipods migrated to greater depths during faster water level reduction rates with smaller individuals displaying greater overall movement. Sediment particle size did not influence the ability of amphipods to move vertically into subsurface sediments in response to water level reduction. The results indicate that subsurface sediments may serve as a refuge from surface drying but that both the size of individual invertebrates influences their ability to migrate vertically.

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author
; ; ; and
publishing date
type
Contribution to journal
publication status
published
keywords
Burrowing, Head-width, Macroinvertebrate, Sediment particle-size, Stream drying, Water level reduction
in
Hydrobiologia
volume
848
issue
5
pages
1015 - 1025
publisher
Springer
external identifiers
  • scopus:85100517881
ISSN
0018-8158
DOI
10.1007/s10750-020-04500-x
language
English
LU publication?
no
additional info
Publisher Copyright: © 2021, The Author(s).
id
9e17b4ec-bca8-4c73-99eb-797e87c2cadd
date added to LUP
2022-02-07 10:28:53
date last changed
2022-04-25 03:36:13
@article{9e17b4ec-bca8-4c73-99eb-797e87c2cadd,
  abstract     = {{<p>This study aimed to experimentally examine how riverbed drying and different rates of water level reduction influenced the vertical movement of amphipods of various sizes into different subsurface sediment compositions. Using sediment columns (mesocosms) filled with different sized transparent substrates, we explored how varying speeds of drawdown affected vertical movement and stranding of individuals. We hypothesised that: (1) larger individuals would be less able to migrate within subsurface sediments compared to smaller ones; (2) smaller sediment particles would lead to more individuals becoming stranded and; (3) faster rates of water level drawdown would increase the likelihood of individuals becoming stranded above the waterline. Body size significantly influenced the final position of an individual, with smaller individuals accessing deeper sediments more readily. Larger amphipods were more likely to become stranded above the waterline. Amphipods migrated to greater depths during faster water level reduction rates with smaller individuals displaying greater overall movement. Sediment particle size did not influence the ability of amphipods to move vertically into subsurface sediments in response to water level reduction. The results indicate that subsurface sediments may serve as a refuge from surface drying but that both the size of individual invertebrates influences their ability to migrate vertically.</p>}},
  author       = {{Patel, C. and Vadher, A. N. and Mathers, K. L. and Dwyer, C. and Wood, P. J.}},
  issn         = {{0018-8158}},
  keywords     = {{Burrowing; Head-width; Macroinvertebrate; Sediment particle-size; Stream drying; Water level reduction}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{1015--1025}},
  publisher    = {{Springer}},
  series       = {{Hydrobiologia}},
  title        = {{Body size affects the vertical movement of benthic amphipods through subsurface sediments in response to drying}},
  url          = {{http://dx.doi.org/10.1007/s10750-020-04500-x}},
  doi          = {{10.1007/s10750-020-04500-x}},
  volume       = {{848}},
  year         = {{2021}},
}