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Survival of incipient non-indigenous populations is dramatically altered by early predation on new colonisers. These effects can be influenced by morphological traits, such as coloniser size and density. The Australian non-native Pacific Oyster  Crassostrea gigas  is generally more fecund and faster growing compared to the native  Saccostrea glomerata  found in the same habitat. It is therefore important to quantify how the two species differ in survival across coloniser density and predation gradients. This information could become pertinent to the management of wild and aquaculture populations of the non-native  C. gigas . Using a field-based factorial experiment we model the survival of incipient populations of both the native  S. glomerata  and the non-indigenous  C. gigas  as a function of coloniser density, predator reduction and individual size. Unexpectedly, survival of the non-indigenous  C. gigas  increased compared to  S. glomerata  when individuals were larger. The proportional survival of newly colonised oyster populations also increased with larger initial populations, regardless of species identity. Further, predator reduction resulted in increased survival of both oyster species, irrespective of coloniser size or initial density. Here we quantitatively demonstrate the effects of recruit density and size on enhancing the survivability of incipient oyster populations.

Colonisation of the Non-Indigenous Pacific Oyster Crassostrea gigas Determined by Predation, Size and Initial Settlement Densities