さあ！諸君！捕鯨問題だ！

これはサイエンス誌２月13日号の注にあったホルトのマリン・ポリューション・
ブレティンの中の記述だったですかね。
ほんとだったら大変なことだなあ。

とりあえず、ピーターBベストの最近のまとめを貼っておきます。
もう1984年に糞からイカの嘴を見つけた報告が出てるんだねw

いずれにしても海域ごと、季節ごとの違いが激しいのだから、同じ個体を
追跡調査して、どういう理由で餌種を選好しているのか（生理的要求等
体内条件、餌種の密度という物理条件etc.）バイオプシーや糞からの
血液、ホルモンの変化との照合、海域での餌生物種生態との対照をするのが
正解でしょうね。

Bryde's Whale／Balaenoptera brydei
........
<Food and feeding behaviour>
Whales from the inshore population on the west coast of South
Africa fed almost exclusively on pelagic fish, principally anchovy
_Engraulis japonícus_ (61%) but also juvenile maasbanker _Trachurus
trachurus_ (14.7%) and pilchard _Sardinops ocellata_ (1.6%). Feeding
was intensive, with 92.3% of the stomachs examined containing
food<10> and fills reaching 92 kg.<2> On the south coast of South
Africa, at-sea observations confirmed the predominance of
pelagic fish and anchovies in particular in the diet, while the
shoaling squid _Lycoteuthis diadema_ was identified from faecal
samples collected at one sighting.<15>
Whales from the offshore population on the west coast of
South Africa fed on both euphausiids (80%) and fish (18.5%).
Feeding was intensive, with 83.3% of stomachs containing
food<10> and fills reaching 120 kg.<2> Euphausiids eaten were mainly
_Euphausia lucens_(24.3%), but _E. recurva_, _Thysanoessa gregaría_,
and _Nyctiphanes capensis_ were also consumed, while the fish -
lightfish _Maurolicus muelleri (4.6%), barracudina _Lestiddium_ sp.
(2.3%) and saury _Sxomberesox saurus (2.3%) - were more oceanic
and deep-dwelling in nature than those taken by whales from the
inshore population. Observations from a pelagic whaling opera-
tion over the entire west coast of southern Africa indicated a diet
of fish (68.6%) and 'shrimps' (31.4%) for whales from the same
population, with higher incidences of feeding in spring/
summer than autumn/winter. There was also a marked change in
food-type, 'shrimps' being relatively unimportant in autumn
(6%) and winter(10%), but becoming more important in spring
(21%) and predominating in summer (75% of stomachs
containing food).<10>
On the east coast at Durban, the incidence of food in the few
stomachs examined was low (23.8%), and individuals were
feeding on fish ('sardines', carangid sp.). squid (L. diadema) and
'shrimp remains'. Bryde's whales south of Madagascar in autumn
were feeding more intensively (46.7%) and exclusively on
euphausiids (_E. recurva_ and E. diomedeae_).<10>
＿＿＿＿＿＿＿＿＿注＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿
<2> Best,P.B. 1977 Two allopatric forms of Bryde's whale off South
Afnca,. Report of the Interndtional Whaling Commission (Special Issue)
1: 10-38.
<10> Best, P.B. 2001. Distribution and population separation of Bryde's
whale _Balaenoptera edeni_ off southern Africa. Marine Ecology Progress
Series 220:277-289.
<15> Best, P.B., Butterworth, D.S., and Rickett, L.H. 1984a. An
assessment cruise for the South African inshore stock of Bryde's
whale (_Balaenoptera edeni_). Report of the Intemational Whaling
Commission 34: 403-423.
====================================================
Peter B. Best 2007, Whales and Dolphins of the Southern African Subregion, p.60-61