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PredationPredation is an interaction in which one organism, the predator, hunts and consumes another organism, the prey. This relationship plays an important role in maintaining the balance of ecosystems by controlling population sizes, driving natural selection, and shaping food webs. Predation affects both predator and prey species, influencing their behavior, physical adaptations, and survival strategies.Science and Engineering Practices (SEP): Analyzing and Interpreting DataScientists...
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Predatory nudibranchs drastically reduce sponge biomass, increasing silica deposition. Sponges then rapidly regrow, absorbing dissolved silicon even at low concentrations, highlighting a dynamic sponge-silica cycle.

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Area of Science:

  • Marine Biology
  • Biogeochemistry
  • Ecology

Background:

  • Sponges are significant accumulators of biogenic silica in marine ecosystems.
  • Their silica stocks were previously thought to be stable intra-annually.
  • Spongivorous nudibranchs can impact sponge populations.

Purpose of the Study:

  • To investigate the effect of nudibranch predation on sponge biomass and silicon cycling.
  • To quantify the impact of predation on the sponge (Hymeniacidon perlevis) silicon budget.
  • To understand sponge recovery and silicon assimilation dynamics post-predation.

Main Methods:

  • A year-long field study monitoring sponge biomass and nudibranch abundance.
  • Quantification of biomass loss due to nudibranch predation.
  • Measurement of silicon assimilation rates under varying dissolved silicon concentrations.

Main Results:

  • Nudibranch predation caused a 95% decrease in sponge biomass over 5 months.
  • 48% of biomass loss was directly attributed to nudibranch predation.
  • Sponges recovered biomass through rapid growth and silicon assimilation, notably at low dissolved silicon levels.
  • Ingested sponge spicules were largely excreted unbroken, enhancing sediment silica deposition.

Conclusions:

  • Annual sponge predation-recovery cycles induce significant intra-annual fluctuations in sponge silicon stocks.
  • These cycles can substantially boost marine silica cycling.
  • Understanding sponge ecosystem dynamics requires intra-annual data collection to capture these rapid changes.