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The marine borer  Limnoria  ingests essential wood components including the extractives the wood contains. Some extractives may confer borer resistance on certain timbers. Feeding by  Limnoria  correlates with the rate of production of faecal pellets. The faecal pellet production rate and mortality on over 40 test timbers and non-resistant  Pinus sylvestris  sapwood was measured over 15 days. By placing animals in leachate from wood and with wood in flowing seawater, the effects of leaching-resistant and water-soluble compounds were measured. Some previously untested timbers affected  Limnoria  as strongly as timbers reputed for durability in marine construction. Wood of  Minquartia guianensis ,  Nectandra rubra  and  Bruguiera gymnorhiza  caused high mortality, and pellet production on them was less than 10% of production on  P. sylvestris . Suppressed feeding rates, but with no heavy mortality, were observed on known durable species such as  Chlorocardium rodiei ,  Dicorynia guianensis, Lophira alata  and  Nauclea trillesii , but also on  Cynometra ananta ,  Distemonanthus benthamianus ,  Enterolobium schomburgkii ,  Goupia glabra ,  Hymenaea courabil ,  Mammea africana ,  Shorea  sp. and  Sacoglottis guianensis . Leachate from  B. gymnorhiza ,  G. glabra ,  H. coubaril ,  N. rubra  and  Shorea  sp. caused high mortality. These short-term bioassays thus detected clear differences between wood species in their resistance to  Limnoria  that matched findings from long-term marine trials, while indicating new species worthy of detailed testing.

holzforschung

Laboratory screening of tropical hardwoods for natural resistance to the marine borer  Limnoria quadripunctata : The role of leachable and non-leachable factors