Using a thermistor flowmeter with attached video camera for monitoring sponge excurrent speed and oscular behaviour

Brian W. Strehlow*, Damien Jorgensen, Nicole S. Webster, Mari Carmen Pineda, Alan Duckworth

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A digital, four-channel thermistor flowmeter integrated with time-lapse cameras was developed as an experimental tool for measuring pumping rates in marine sponges, particularly those with small excurrent openings (oscula). Combining flowmeters with time-lapse imagery yielded valuable insights into the contractile behaviour of oscula in Cliona orientalis. Osculum cross-sectional area (OSA) was positively correlated to measured excurrent speeds (ES), indicating that sponge pumping and osculum contraction are coordinated behaviours. Both OSA and ES were positively correlated to pumping rate (Q). Diel trends in pumping activity and osculum contraction were also observed, with sponges increasing their pumping activity to peak at midday and decreasing pumping and contracting oscula at night. Short-term elevation of the suspended sediment concentration (SSC) within the seawater initially decreased pumping rates by up to 90%, ultimately resulting in closure of the oscula and cessation of pumping.

Original languageEnglish
Article numbere2761
JournalPeerJ
Volume2016
Issue number12
ISSN2167-8359
DOIs
Publication statusPublished - 1. Jan 2016
Externally publishedYes

Keywords

  • Behaviour
  • Contraction
  • Flowmeter
  • Pumping
  • Sponge
  • Thermistor

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