Calif Pacific Southwest Forest And Range Experiment Stat
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1995. 375 Ralph and Long Chapter 35 Productivity in California-Observations At Sea basic-like plumage that we aged by missing primaries or molting areas on the belly, neither of which would be seen unless the bird flapped its wings. A substantial number of adults were classified as birds of unknown age during this period. Obviously, most of these were actually adults. By 19 September, 90 percent of the population was in basic or near-basic plumage. Discussion Our results, using more rigorous me...thods than previously employed, confirmed productivity estimates from California over the previous five years of under 3 percent. Such a low productivity may indicate a population with a very low reproductive rate. However, we may also be missing some of the juveniles in our surveys if they are distributed differently on the ocean than the adults. In our experience, single birds are usually more difficult to detect from boats. Varoujean (pers. Comm. ) found during aerial surveys that many juveniles were alone.
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