Roper c f e (41 Ergebnisse)

Smithsonian Institution Press, City of Washington - 1979, Smithsonian contributions to zoology, number 288, plaquette de 20x26 cm, 36 pages Très bon état - Pour les envois hors de France, la tafication «livre & brochure» pour les frais de port a disparue.Les frais de port annoncés correspondent à une moyenne. Ils seront calculés au plus juste en fonction du poids de votre article.…

Soft cover. 4to, paperbound (Dana Report 66) 0.0.

10 pp., 6 figs, br. 4.

15) 0.0.

19 pp., br. gr. 8.

288) 0.0.

121) 0.0.

493) 0.0.

209) 0.0.

32 pp. incl. 16 pls, br. gr. 8.

24 pp., 9 pls, br. gr. 8.

Soft cover. Unopened 0.0.

40 pp., 81 figs, br. gr. 8.

46 pp., 53 figs, br. gr. 8.

9 pp., 4 pls, broch. gr. 8.

12 pp., 3 pls, 1 map, 2 tabs, 4.

New taxon: Enoploteuthis anapsis n. sp. 9 pp., 2 figs, gr. 8.

10 pp., 2 figs, gr. 8.

15 pp., gr. 8.

15 pp., 4 figs, gr. 8.

7 pp., 3 figs, 4.

7 pp. + 4 pls, 4.

New taxon: Bathyteuthis bacidifera n. sp., Bathyteuthis berryi n. sp. 12 pp., 7 pls, 8.

New taxon: Enoploteuthis anapsis n. sp. 9 pp., 2 figs, 8.

11 pp., 1 fig., gr. 8.

Nine species of midwater cephalopods, fish, and shrimp, examined ina shipboard aquarium, adjusted the intensity oftheir luminescence to match the intensity of the overhead light. Most animals tested could regulate this ventral countershading luminescence in response to a wide range of light inten_ sities. A black anglerfish, Cryptopsaras couesi, also produced a faint later glow, indicating that bioluminescence may be important in lateral countershading in some species. Our observations indi_ cate that ventral countershading is effective to depths of 750-775 m during the day off Hawaii. We suggest that the concealment strategy of ventral bioluminescent countershading is limited to depths greater than 350-400 m, largely because of the high visual acuity of predators and the high cost of producing countershading luminescence at lesser depths. 14 pp., 4 figs, gr. 8. …

New taxa: Batoteuthis skolops n. gen., n. sp. 18 pp., 6 pls, gr. 8.

20 pp., 4.

Three large data sets on cephalopods are critically examined with respect to several sources of error: day-night avoidance, net size, mode of fishing, and patchiness. Catches are low and variable and results only suggest problems with present sampling techniques. Specific field sampling is suggested to quantify several of these sources of error. Volume filtered and time fished are compared as measure of effort . Variability of volume filtered and net speed within a single tow are examined. 21 pp., 4 figs, gr. 8.…

46 pp., 24 figs, br. 4.