Whales, Dolphins, and Porpoises of the Western North Atlantic Part 40

SIGHTING INFORMATION

DATE AND LOCAL TIME [Handwriting: 27 January 1977 0845] LOCATION[13]

[Handwriting: Ca. 2500'N, 8030'W]

WEATHER CONDITIONS [Handwriting: Scattered rain squalls, visibility 1-1.5 mi, Temp 42F]

OCEANOGRAPHIC CONDITIONS[14] [Handwriting: Swells 1-2 feet, scattered white caps Winds from S.E. @ 3-8 knots, gusting in squalls to 15 knots.]

SPECIES[15] [Handwriting: Right Whales, Eubalaena glacialis (45 ft/15 ft)] NUMBER OF ANIMAL(S) [Handwriting: 2]

HEADING OF ANIMAL(S) [Handwriting: 015] SPEED OF ANIMAL(S) [Handwriting: 1-2] (MAGNETIC) (KNOTS)

a.s.sOCIATED ORGANISMS[16] [Handwriting: Bottlenosed dolphins, Tursiops truncatus (3) and unidentified gulls (10-20)]

TAGS OR UNUSUAL MARKINGS [Handwriting: One whale had deep slash across back about 3 ft. behind blowholes-area of slash was white.]

CHARACTERISTICS OBSERVED WHICH RESULTED IN SPECIES IDENTIFICATION [Handwriting: 45 ft, No dorsal fin, smooth black back, high arching jaws, yellowish-orange growths on head, coastal habitat]

BEHAVIOR OF ANIMAL(S) [Handwriting: Adult whale swam steadily north, calf close beside, Bottlenosed dolphins riding in front of adults head.]

SKETCHES [Hand-drawn ill.u.s.tration of whales, dolphins and distinguis.h.i.+ng features.]

PHOTOS AVAILABLE YES NO

[Handwriting: Photos (GEL, Roll 16, frames 8-30)]

ADDITIONAL REMARKS [Handwriting: Dolphins remained with whales entire 1/2 hour of observation, appently riding on pressure wave.]

NAME AND ADDRESS OF OBSERVER (s.h.i.+P OR A/C) [Handwriting: G. E. Lingle, Naval Undersea Center, San Diego, California 92132 and G. A. Antonelis, NMFS, Seattle, Was.h.i.+ngton 98105 aboard the RV Cape]

[Footnote 13: If lat.i.tude and longitude are not readily available, record best available position, for example 5 hours at 10 knots, SE of Miami.]

[Footnote 14: Any oceanographic or bathymetric information obtainable at the time of sighting may be significant. Such measurements as water depth, presence of large fish schools, or deep scattering layer/organisms (DSL) characteristics of the bottom (e.g., flat sand plain, sea mount, submarine cliff), surface temperature, depth of thermocline, and salinity should be included if available. In the Pacific, similar data have been used to demonstrate reliable a.s.sociations there between saddleback dolphins and significant features of bottom relief and relations.h.i.+ps between the onset of their nighttime deep diving (feeding) patterns and the upward migration of the scattering layers.]

[Footnote 15: Sometimes two or more species of cetacean are found together. If more than one species is sighted, try to identify each.

Give both common and scientific names of each, and even if you cannot identify the animal(s) describe, sketch, and, if possible, photograph them and fill out the rest of the sighting report.]

[Footnote 16: Describe any tags seen (see Appendix A) and state their size, shape, color, and position on the animal's body and any symbols or numbers they contain.]

APPENDIX C

STRANDED WHALES, DOLPHINS, AND PORPOISES

With a Key to the Identification of Stranded Cetaceans of the Western North Atlantic

Stranded Animals

As we discussed briefly in the introduction to this guide, whales, dolphins, and porpoises sometimes "strand" or "beach" themselves, individually or in entire herds, for a complex of still incompletely understood reasons. Though the reasons suggested for these strandings appear almost as numerous as the strandings themselves, two tenable generalizations have recently been proposed.

Strandings of lone individuals usually involve an animal which is sick or injured. Ma.s.s strandings, involving from several to several hundred individuals, appear to be far more complex and may result from fear reactions, from extremely bad weather conditions, from herd-wide disease conditions, or from failure of the echolocation system due to physiological problems or environmental conditions which combine to reduce its effectiveness, to mention only a few.

Whatever their causes, however, cetacean strandings usually attract crowds and elicit much public interest and sympathy. There are frequently attempts to save the lives of the animals involved.

Individually stranded cetaceans rarely survive, even if they are found soon after stranding and transported to adequate holding facilities.

This does not mean that every attempt should not be made to save them.

In ma.s.s strandings, some individuals may be entirely healthy, and if they are found soon enough after stranding, properly protected and transported, and correctly cared for in the initial few days after collection, they may survive in captivity. Attempts to rescue all the animals in a ma.s.s stranding by towing them out to sea have almost always been frustrating because the animals usually swim repeatedly back onto the beach.

If you discover a stranding and before you become involved in an attempt to save a live stranded animal or to collect data from a dead one, you should be aware of the following:

MARINE MAMMALS ARE CURRENTLY PROTECTED BY LAW. Under provisions of the Marine Mammal Protection Act of 1972, it is unlawful for persons without a permit to handle, hara.s.s, or possess any marine mammal. It is within the authority of State officials and employees of the National Marine Fisheries Service to arrange for the care of live animals through certified inst.i.tutions, such as many of those listed in Appendix E.

(Even if the animals were not protected by law, any impulse to take them to backyard swimming pools, for instance, should be tempered by the knowledge that their chances of survival are far greater in an inst.i.tution with the facilities and expertise to properly care for them.) The best general rule is to notify the nearest State or National Marine Fisheries Service office. If you prefer, however, you may contact one of the inst.i.tutions listed in the appendix and ask them to handle the situation. Some will already have permits to investigate strandings. Most will be anxious to help.

Although _you cannot remove the animal from the beach without a permit_, you can help keep it alive until it can be removed. Here are a few hints. WHILE WAITING FOR HELP TO ARRIVE, ENDEAVOR TO KEEP THE ANIMAL AS COMFORTABLE AS POSSIBLE. IF IT IS NOT TOO LARGE AND SURF CONDITIONS PERMIT, IT SHOULD BE REMOVED TO SHALLOW WATER WHERE IT IS BARELY AFLOAT.

The buoyancy of the water will reduce the stress to the animal and will help to keep it cool and prevent overheating--a real danger to stranded cetaceans.

Whether or not the animal can be floated, CARE SHOULD BE TAKEN TO PROTECT IT FROM SUNBURN, DRYING OUT, AND OVERHEATING. IF IT IS AFLOAT, EXPOSED PARTS SHOULD BE FREQUENTLY SPLASHED DOWN. IF IT IS HIGH AND DRY, IT SHOULD BE COVERED WITH DAMP CLOTH, PARTICULARLY ON THE DORSAL FIN, FLIPPERS, AND FLUKES, AND THE BODY AND THE TERRAIN SHOULD BE FREQUENTLY WATERED TO PREVENT THE ANIMAL FROM OVERHEATING IN THE AREAS IN CONTACT WITH THE SAND OR ROCK.

IN ANY CASE, BE CAREFUL TO LEAVE THE BLOWHOLE FREE SO THAT THE ANIMAL CAN BREATHE. NOTE ALSO THAT THE EYES ARE PARTICULARLY SENSITIVE AND SUSCEPTIBLE TO INJURY; THEY SHOULD BE COVERED WITH A WET CLOTH AND TREATED WITH SPECIAL CARE.

With luck, this careful handling will be rewarded with the animal's being picked up and transported to an aquarium, where it can receive proper attention. But even IF THE ANIMAL CANNOT BE SAVED, COLLECTION AND EXAMINATION OF THE CARCa.s.s CAN PROVIDE VALUABLE INFORMATION TO SCIENTISTS WORKING ON THE BIOLOGY OF CETACEANS, OR ON SUCH PROBLEMS AS THEIR DISEASE CONDITIONS AND THE EFFECTS OF ENVIRONMENTAL POLLUTANTS ON THEM. DEAD STRANDED CETACEANS EVEN IN ADVANCED STAGES OF DECOMPOSITION ARE ALSO AN IMPORTANT SOURCE OF MATERIALS FOR MUSEUM STUDY AND DISPLAY.

THEREFORE, EVERY ATTEMPT SHOULD BE MADE TO GET THE CARCa.s.s INTO THE BEST HANDS. DEAD CETACEANS, LIKE THE LIVE ONES, ARE PROTECTED BY LAW AND MAY NOT BE REMOVED WITHOUT A PERMIT. The procedure for obtaining permission to collect them is the same as that outlined for live strandings. The majority of the inst.i.tutions along the western North Atlantic coast will respond to calls about live or dead strandings. Even if you are unable to contact an appropriate official, you can still collect some valuable information by identifying the specimen, using the following key, and by collecting measurements (see Appendix D).

[Ill.u.s.tration: Appendix Figure C1.--Whales and dolphins, like this mixed school of false killer whales and bottlenosed dolphins, sometimes strand themselves individually or as entire herds for a complex of still incompletely understood reasons. (_Photo from j.a.pan by S. Ohsumi._)]

Identifying the Animal

Cetaceans may be found during or shortly after the stranding or many months later, when the carca.s.s is bloated or rotted nearly beyond recognition. If the stranded animal is alive or freshly dead, it can be identified by any of the characteristics itemized in the text. But even if it is in an advanced stage of decomposition it can be identified using the key below. In general numbers and descriptions of teeth (Table 1) and numbers and descriptions of baleen plates (Table 2) persist longest as reliable identifying characteristics. If they are still detectable on the carca.s.s, numbers and lengths of ventral grooves may also be used to separate the balaenopterine whales.[17]

[Footnote 17: The tables were prepared primarily from Tomilin (1967) and supplemented by miscellaneous published papers and our own observations.

The sections on toothed whales in the key were developed following the general outline of Moore (1953).]

In order to use the key below, begin with the first pair of opposing characteristics--one of the two will apply to the specimen you are examining. On the line following that statement there will be a paragraph number, go to that paragraph. There you will find two more paired, opposing characteristics. Again, one of the two will apply to the specimen you are examining. Select that one and go to the paragraph indicated on the line following it. Continue this procedure until the statement which is true for your specimen is followed by a species name instead of a reference to another paragraph. This name identifies the specimen. To verify your identification go to the discussion of that species in the text. With a little practice and careful attention to details, identification of whales, dolphins, and porpoises will become easier.

KEY TO THE IDENTIFICATION OF STRANDED CETACEANS OF THE WESTERN NORTH ATLANTIC

1. a. Double blowhole; no teeth present in either jaw; baleen plates in upper jaws. (Baleen whale) Go to 2

b. Single blowhole; teeth present (sometimes concealed beneath the gums); no baleen plates in upper jaw.

(Toothed whale) Go to 9