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Suspended sediments limit coral sperm availability.

Gerard F Ricardo1,2,3,4, Ross J Jones2,3, Peta L Clode1,4

  • 1Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, Western Australia, 6009, Australia.

Scientific Reports
|December 15, 2015
PubMed
Summary
This summary is machine-generated.

Suspended sediment harms coral reproduction by reducing sperm availability. Sediment entanglement and sinking decrease sperm concentration, lowering fertilization success and impacting reef populations.

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Area of Science:

  • Marine Biology
  • Ecology
  • Reproductive Biology

Background:

  • Coral reproduction is vital for reef maintenance.
  • Dredging and natural events increase suspended sediment, posing a threat to coral fertilization.

Purpose of the Study:

  • To investigate how suspended sediment affects coral fertilization success.
  • To identify mechanisms reducing fertilization in turbid waters.

Main Methods:

  • Experiments exposing coral gametes (Acropora tenuis and A. millepora) to siliciclastic and carbonate sediments.
  • Measuring sperm concentration and fertilization rates.
  • Utilizing electron microscopy to observe sediment-sperm interactions.

Main Results:

  • Siliciclastic sediment significantly increased sperm limitation (2-37 fold more sperm needed for fertilization).
  • Sperm concentration at the water's surface decreased by >45% with siliciclastic sediment and >20% with carbonate sediment.
  • Electron microscopy confirmed sediment entanglement of sperm, suggesting entrapment and sinking as the primary loss mechanism.

Conclusions:

  • High suspended sediment concentrations reduce sperm availability at the water's surface during coral spawning.
  • This sperm depletion lowers fertilization success and can negatively impact coral recruitment.
  • Understanding these impacts is crucial for managing coastal development and conserving coral reefs.