There's no place like home: crown-of-thorns outbreaks in the central pacific are regionally derived and independent events.

PloS One
Molly A TimmersRobert J Toonen

Abstract

One of the most significant biological disturbances on a tropical coral reef is a population outbreak of the fecund, corallivorous crown-of-thorns sea star, Acanthaster planci. Although the factors that trigger an initial outbreak may vary, successive outbreaks within and across regions are assumed to spread via the planktonic larvae released from a primary outbreak. This secondary outbreak hypothesis is predominantly based on the high dispersal potential of A. planci and the assertion that outbreak populations (a rogue subset of the larger population) are genetically more similar to each other than they are to low-density non-outbreak populations. Here we use molecular techniques to evaluate the spatial scale at which A. planci outbreaks can propagate via larval dispersal in the central Pacific Ocean by inferring the location and severity of gene flow restrictions from the analysis of mtDNA control region sequence (656 specimens, 17 non-outbreak and six outbreak locations, six archipelagos, and three regions). Substantial regional, archipelagic, and subarchipelagic-scale genetic structuring of A. planci populations indicate that larvae rarely realize their dispersal potential and outbreaks in the central Pacific do not spread ...Continue Reading

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Citations

Jun 30, 2018·Conservation Biology : the Journal of the Society for Conservation Biology·Scott A CondieRoger Beeden
Sep 16, 2016·Scientific Reports·Alex Garcia-CisnerosRocío Pérez-Portela

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Methods Mentioned

BETA
PCR

Software Mentioned

S equencher
MIGRATE
odeltest
igrate
ea V iew
rlequin
io E dit
muscle
SPSS

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