We compared the stand conditions in buffer strips with those in unlogged riparian stands with similar site characteristics using large-scale aerial photography to deduce differences in stand mortality and large woody debris (LWD) recruitment. We found the cumulative stand mortality (CSM) was significantly greater in buffer units compared with reference units and that mortality varied with distance from the stream. In the inner zone (0–10 m from stream), the mean difference in CSM between buffer and reference units was relatively small (22% of unlogged CSM), but the CSM in the buffer units of the outer zone (10–20 m from stream) was more than double (120%) the CSM in the reference units. The greater CSM in the buffer units is primarily the result of a significant increase in mortality by windthrow at a small proportion (11%) of the logged units. We found that logging caused an increase in the proportion of tree recruitment to the stream from the outer zone of buffers and changed the shape of the LWD source distance recruitment curve. Based on our findings, we estimate the future potential supply of LWD is diminished by 10% compared with an unlogged reference stand.

The North Pacific right whale population was hunted commercially between 1835 and 1935, at which time the species received protection. Commercial whalers harvested over 15 O00 North Pacific right whales during this period, so reducing the population that today there are an estimated 100-200 right whales in the North Pacific. The American Pacific Whaling Company operated in the Gulf of Alaska and eastem Bering Sea during 1917-39. We report the distribution, sexes, and lengths of 20 right whales recorded in the Company logbooks and ledgers. These records identify that right whale catches were widely distributed on the whaling grounds and tended to decrease over the May-October whaling season. Of the 17 whales for which sex and length data were documented, 1 1 were females. Their average length exceeded that of males. Lengths of the whales indicated that 41% of the catch were sexually mature; two females canied fetuses. Although the sample size is small, these results suggest that the North Pacific right whale population was inhabiting its historic summering grounds after the period of heavy exploitation in the 1800s, reproducing as late as 1926, and supporting a subadult cohort at least until the species was protected. Key words: right whale, North Pacific Ocean, Alaska, distribution RÉSUMÉ. La population de baleines noires dans le nord du Pacifique fut sujète à la chasse commerciale entre 1835 et 1935, date à laquelle elle fut prot6gée. Les baleiniers commerciaux tuhrent plus de 15 O00 baleines noires durant cette période, réduisant leurs nombres à un tel point qu'il n'existe aujourd'hui qu'entre 100 et 200 baleines noires dans le nord du Pacifique. La American Pacific Whaling Company poursuivit ses opérations dans le golfe de l'Alaska et le mer de Béring de 1917 à 1939. Le présent article signale la distribution, le sexe et la longueur de 20 baleines noires inscrites dans les grands livres et les journaux de bord de la compagnie. Les dossiers indiquent que les prises de baleines noires étaient distribuées sur une vaste région dans les eaux de chasse àla baleine et semblaient diminuer progressivement durant la saison de chasse àla baleine qui durait de mai àoctobre. Des 17 baleines dont le sexe et la longueur étaient documentés, 11 &aient des femelles. Leur longueur moyenne excédait celle des mâles. La longueur des baleines indiquait que 41% des prises avaient atteint la maturité sexuelle; deux femelles portaient des foetus. Bien que la taille de l'échantillonnage est restreint, ces résultats suggèrent que la population de baleines noires habitaità ce moment-là ses eaux estivales historiques après la période d'exploitation intensive des annees 1800, que le cycle de reproduction se r6p6tait au moins jusqu'en 1926 et qu'une suite de subadultes était assurée au moins jusqu'au passage des lois protectrices. Mots clés: baleine noire, nord de l'océan Pacifique, Alaska, distribution Traduit pour le journal par Maurice Guibord.