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January 2011: UK researchers find distribution of SM along entire spinal cord of cavaliers; syrinx size positively correlated with age. Analysis of litters produced using the interim breeding guidelines revealed that higher numbers of dogs which were SM-clear over five years were produced if a parent was also clear of SM over 5 years. This effect is rapidly reversible after cessation of the treatment. Can expansion of zebra mussel, Dreissena polymorpha (Bivalvia) influence the numbers and behavior of traditionally herbivorous mute swan, Cygnus olor (Aves)? As of 2013, 16 of the dogs had developed clinical signs compatible with CM/SM, with an age range of 4 years to 7 years. Pairs often defend their territories, primarily by using threat displays to chase away other birds, but occasionally attacking with wings or bill. McFadyen, Jelena Jovanovik, Anna Tauro, Colin. At more local scales, mute swan populations may double every five years in the initial growth phase after establishment, but then population growth slows after 25-30 years due to density dependence (Ellis Elphick 2007).