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Marine pollution bulletin v.125 no.1/2, 2017년, pp.166 - 175   SCI SCIE
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Effects of suspended sediments and nutrient enrichment on juvenile corals

Humanes, Adriana (ARC Centre of Excellence for Coral Reef Studies, College of Science and Engineering, James Cook University, 4811 Townsville, Queensland, Australia ) ; Fink, Artur (Max-Planck Institute for Marine Microbiology, Bremen, Germany ) ; Willis, Bette L. (ARC Centre of Excellence for Coral Reef Studies, College of Science and Engineering, James Cook University, 4811 Townsville, Queensland, Australia ) ; Fabricius, Katharina E. (AIMS@JCU, Division of Research & Innovation, James Cook University, Australian Institute of Marine Science, Townsville, Queensland 4811, Australia ) ; de Beer, Dirk (Max-Planck Institute for Marine Microbiology, Bremen, Germany ) ; Negri, Andrew P. (AIMS@JCU, Division of Research & Innovation, James Cook University, Australian Institute of Marine Science, Townsville, Queensland 4811, Australia ) ;
  • 초록  

    Abstract Three to six-month-old juveniles of Acropora tenuis , A . millepora and Pocillopora acuta were experimentally co-exposed to nutrient enrichment and suspended sediments (without light attenuation or sediment deposition) for 40days. Suspended sediments reduced survivorship of A . millepora strongly, proportional to the sediment concentration, but not in A . tenuis or P . acuta juveniles. However, juvenile growth of the latter two species was reduced to less than half or to zero, respectively. Additionally, suspended sediments increased effective quantum yields of symbionts associated with A . millepora and A . tenuis , but not those associated with P . acuta . Nutrient enrichment did not significantly affect juvenile survivorship, growth or photophysiology for any of the three species, either as a sole stressor or in combination with suspended sediments. Our results indicate that exposure to suspended sediments can be energetically costly for juveniles of some coral species, implying detrimental longer-term but species-specific repercussions for populations and coral cover. Highlights Suspended sediments (SS) depressed growth and survivorship of coral juveniles. SS elevated respiration rates in A . tenuis , highlighting energy costs caused by SS. SS increased effective quantum yields in A . millepora and A . tenuis by 30 and 40%. Numbers of colonies reaching reproductive size will likely be decreased at high SS. Organic nutrients did not affect juvenile survivorship, growth or photophysiology.


  • 주제어

    Coral .   Sediment .   Nutrient .   Physiology .   Juvenile .   Recruitment.  

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