C. Stationsnachrichten u. sonstige Notizen
Internationale Revue der gesamten Hydrobiologie und Hydrographie
Because a majority ' of the Station's Staff are still holding college positions and hence can be a t La Jolla Bnly during vacation time, the summer months are the most active of the year. This disadvantage must continue until the income is sufficient to maintain operations at sea and a considerable part of the work in the laboratory throughout the year. On the biological side the most important event of the year is the final issuance of Mr. E. L. Michael's "Classification and Vertical
... Vertical Distribution of the Chaetognatha of the San Diego Ragion" (Univ. Calif. Public. Zoology, Vol. 8, No. 3, 166 pp., 8 pls.). In this the author not only records a l l the species so far taken in these waters and subjects the description and taxonomy of the group to a critical examination, but deals quantitatively with the large amount of data collected during the five years from 1904 to 1909.l) The aim of the ecological aspect of the investigation was to ascertain the facts concerning the distribution, seasonal and vertical, of the organisms, and to aee how far these are conelatable with and hence dependent upon the environmental factors of light' and of temperature and density of the water. Efforts were limited to these three environmental factors simply because the scope of the Station's work up to this time has not made it possible to extend the hydrographic observations beyond these. While it is impossible to summarize here the results reached, a few, particularly significant, may be indicated. Oompasison of the distribution of the ten species occuriog in the area 'shows conclusively that the manner of distribution is correlated with the organization of the species. In other words the distinctive manner in which each species is distributed is as much a specific c h a r a c t e r as is its structure". For example, each species appears to have its own depth of maximum abundance, spoken of by Mr. Michael as its 'centre of migration". This is certainly true of the more abundant species, and seems to be true of those which do not occur in sufficient numbers to render the results so far obtained entirely conclusive. From 16 to 20 fathoms is found to be 1) Anmerkung der Redaktion. Vgl. auch das ausflihrliche Autoreferat fiber diese wchtige Arbeit in diesem Heft S. 514-521.