NOSCrptProjCOMBO_1980

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PINNIPEDS (U)
( U) Tile Welldell se;1l. Lepr1J11ydwreJ wc•dddli. emits narrowhand pulsl.'s at re1wtition
ratl.'s from above: 140 sec.: to one in several se•onds I refl•ren•e 26 J. The soumJs' freqUL•nq•
range is rrom 50 to 10.000 llz. Thi.' pulse trains typically ~t;irt at I to 2 kllz with a ra~t
repetition ratl' and end al :ihout 0. I kHz with slow repel it ion. Individual pulse~ in a train Ml"
rrequc:nl"Y modulatc:d from 2 kllz at 10 kH.t to 50 M.t at 100 llz. Weddell Sl'als also 1irud11c.:e
howls. with fundamc:ntals rnnging from 50 to 4000 Hz and with strong l1:1m10nk slntl°tUrl'.
and ringing sounds in the: I- to J-kHz range that last up to 10 st'l'. Weddell sc;ils on·lir in thl•
southc:rn hemisph.-re around !he Antarl·til' l"Ontinent and its adjac.:ent pal"k il·e. \h·ddell seal~
migrate: as far as JO~S to South Amerk;1. to Australia. and to Nl.'w Zl•al;ind.
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!Ul The beanled seal. l:"rig11arlws b11rht1llfs. emirs a whistle with a tremolo dtar:il··
teristk c.:auSl.'J by fast frequency llllldulation of a few hertz. l'hl.' whistk is modulated rurthcr
OVI.' r Sl'Vt'ral hundred lie rt z at mies or ahou I I /Sl.'l' I 0 one in Sl'\'eral sec.:unds as I he whist k
drops 3 to 4 kllz to 0.2 k llz owr :1 period of :1 111 inu te ( reforcnc.:c ~ 7 ). The !warded sl.'al is
l.'in:umpolar in·W;iters or thl.' An:lil'.0l'l'an and till' auj;ic.:ent Atlanlic ;111d l'ac.:ifi.- n:gions.
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( U l The rinJ:!cd sc.:al.1'11s11 J1i.1l1ida. pruduc.:l.'s a numher or sounds. induding a ~lcady
disc.:rcte-c.:omponcnt. downward frcquc.:1ll'Y sWl'cp imhued with harmonks (rl·fl.'rcnl·c ~Xl.
The sounlls las! from aboul 1 lo 4 sec.:, rnngl' from 5 kllz lo 0.2 kllz and have at k•asl four
sl rong harn1011ks whkh 111ay ex tend above I 0 kHz. This seal also makl'~ a broad hand ringing
sounll in the frequc.:n•y rangl' fro111 hdow ~ kllz to ahout 6 kllz. with lluratinns up to 15
sec.: .. Tl1c ringed seal ocrnrs widely in the.: Arl'lk Oc..·ean and on till' norl.h l'0:1sts of Europe.
Greenland. North Americ.:;i :md the Soviet Unimi.
I U) The ribbon Sl.'al. l'/wrn (l/istrioplwca) fasC'iata. produces two prinl·ipal t11Hk·r·
water sollnlis coinc.:ident with spring rcproduL·tivc al·tivities: an intense I- to 5-scl' downw;irc.I
frequcnc.:y sweep in the 7- to 0.1-kl lz rl.'gion and a 0- lo 5-kl iz hre:1thi11g-typc M111111I or almosl
I sec dur:ition hut at :!Oto :!5 dB lower in pressure level ( rl.'frrenl'C 2c.; ). This seal 1,
distributed from the northeasl Berin!( Sea to the Sea of Okhotsk and inl. The hark~· 111ai11
c..:omponcnts !->~'.~ur.betwcl.'n 0.5 and I kl.lz. l1:1r111011ics ~xlend up. to aho_ut 5 k.1.!z. Most_or.
1•ln:-at-ttt:r'{'11ill~1-tt'~;1t~ttitt ~mh~'l.·ttt· ffi•tlk H\~in:~-~ ~·t1:1 ta"\' .1.;n.,. :ntc·t'~··
fornia sea lion oc.:c.:urs along the C:11ifornia co:1st. Baja California, the c;alapagos Island!> and i
the.: c.:oast of Japan. Bulls m·c..·ur as for north :ts Washington in the wi111crti111c.
I U) Pinnipc..·d sounds usually oc.:c.:ur within I 0 nmi of coasts. ice packs or llriftini: i'~·-
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