. Wale im Channel Islands National Marine Sanctuary / vorbereitet für nationale ozeanische und atmosphärische Leitung, Channel Islands National Marine Sanctuary und NOAA, National Marine Fischerei Service von Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Wale kalifornischen Kanalinseln.. Vor dem Blasloch, in der Nähe von der Spitze des Mauls. (Der Buckelwal median rostralen Ridge ist verdeckt von zahlreichen Knöpfe - resem-bling übergroße Nieten - über den Kopf verteilt, von denen einige entlang der Mittellinie entfernt). In der Bryde Wal, der einzigen Kopf ridge Charakteristisch für

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. Cetaceans of the Channel Islands National Marine Sanctuary / prepared for National Oceanic and Atmospheric Administration, Channel Islands National Marine Sanctuary and NOAA, National Marine Fisheries Service by Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Whales California Channel Islands.. in front of the blowhole to near the tip of the snout. (The humpback whale's median rostral ridge is obscured by numerous knobs - resem- bling over-sized rivets — scattered about the head, some of which are located along the midline). In Bryde's whale, the single head ridge characteristic of the other rorquals is supplemented by two auxiliary ridges, one on each side of the main ridge. Faint lateral ridges can sometimes be detected on the rostra of fin and blue whales. Recent studies have revealed intergrades of a number of features of this group (e.g., ridges and baleen characteristics), which sometimes confound identification even when fragments of a specimen are in hand. At sea, these whales often appear very similar and must be examined carefully before they can be identified with confidence. Observers should not feel overly disappointed about not being able to make a reliable idetification. There is enough overlap in the behavior of these whales and in the appearance of their surfacing profiles to dictate caution in using any single haracteristic for positive identification. Depending on the animal's activities, the following features may be useful in distinguishing the balaenopterids from one another: i) the size, shape, and position of the dorsal fin and the timing of its appearance on the surface relative to the animal's blow (in general, the larger the whale, the smaller the dorsal fin, the farther back its position, and the later its appearance on the surface after the animal's blow); 2) the height of body in the area of the dorsal fin which is exposed as the animal sounds, relative to the size of the dorsal fin; 3) sometimes the blow rate and movement

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• bookcentury1900
• bookdecad
• bookyear1987
• b��chercollectionamericana