By George A. Llano
About The Product
Published by means of the yank Geophysical Union as a part of the Antarctic examine Series.
The 8 papers during this quantity of the Antarctic learn sequence contain a moment choice of marine organic stories to seem below the identify Biology of the Antarctic Seas. The paintings was once carried out at Stanford college, Texas A&M college, Columbia collage, the collage of Southern California, and the Virginia Institute of Marine technological know-how lower than the auspices of the us Antarctic study application of the nationwide technological know-how origin.
The quantity is prepared to collect papers that supplement each other, both as a consequence of aiding facts or via neighborhood organization. there's one other virtue to this order: the 1st 4 contributions are mostly fascinated by phenomena, while the final 3 emphasize systematics. Contribution quantity 5 presents a stability among those normal parts of study. hence, even supposing every one learn is special and autonomous of the others, the topic fabrics are interrelated and supply a standard fund of knowledge on Antarctic marine environments and their organisms.
The 8 papers during this quantity of the Antarctic learn sequence include a moment selection of marine organic reviews to seem lower than the name Biology of the Antarctic Seas. The paintings was once carried out at Stanford collage, Texas A&M college, Columbia college, the college of Southern California, and the Virginia Institute of Marine technology less than the auspices of the U.S. Antarctic examine software of the nationwide technological know-how starting place.
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Extra info for Biology of the Antarctic Seas II
5 IN SEVERAL ODONTASTER ANTARCTIC VALIDUS ASTEROID J. S. 19EARSE• Departmento/Biological Sciences, Stan/ord U•ziversity, andHopkinsMarine Station,PacificGrove,Cali/ornia Abstract. Reproductiveand related changesare followed for one year in two populationsof the common omnivorousAntarctic asteroid Orlontaster validus Koehler. At McMurdo Station, the site of one population, the fast ice breaks out late in the summer or not at all, and there is a relatively low amount of annual sunlight penetration into the sea.
Qualitative annual changesin phytoproductionor slight changesin temperature or salinity may be more important, however. Spawning occurs mainly from June to mid-September and may be synchronized by environmental changes related to low-temperature water lenses present in the midwinter. The winter spawningperiod of O. validus is probably an adaptation to the slow embryonicand larval developmentalrates which allow the demersal bipinnaria larvae to appear during the summer phytoproduction period. The spring,winter, or fall spawningperiodsof many other polar species with planktotrophiclarvae or youngare apparentlyrelated similarly to the rates of embryonicand larval developmentand the summer phytoproductionperiod.
19 283 Siliceous sponge mat; calcareous ecto- Light olive brown (5 Y 5/6) to grayish procts, variety of alcyonarians, olive (10 Y 4/2) mollusks, polychaetes Oct. 31 282 Siliceous sponge mat' calcareous ecto- Light olive brown (5 Y 5/6) to grayish procts, variety of alcyonarians, olive (10 Y 4/2) mollusks, polychaetes Nov. 5 282 Siliceous sponge mat' calcareousecto- Light olive brown (5 Y 5/6) to grayish procts, polychaete tubes, some olive (10 Y 4/2) alcyonarians Moderate yellowish brown (10 YR 5/4) to light olive brown (5 Y 5/6) Light olive brown (5 Y 5/6) to grayish olive (10 Y 4/2) Note: The living siliceousspongesand calcareousectoproctsthat form the basicsubstrateat this station produce a sublayer of debris composedof bits of spiculesand broken ectoproct branches.