绪论 虎鲸类型和种群(第8/8 页)
s geographic range appears to be circumglobal in sub-Antarctic waters between latitudes 40°S and 60°S. Although its diet is not determined， it likely includes fish， as determined by photographs around longline vessels， where Type D orcas appeared to be preying on Patagonian toothfish (Dissostichus eleginoides).
Types B and C live close to the ice， and diatoms in these waters may be responsible for the yellowish colouring of both types. Mitochondrial DNA sequences support the theory that these are recently diverged separate species. More recently， plete mitochondrial sequencing indicates the types B and C be recognized as distinct species， as should the North Pacific transients， leaving the others as subspecies pending additional data. Advanced methods that sequenced the entire mitochondrial genome revealed systematic differences in DNA between different populations. A 2019 study of Type D orcas also found them to be distinct from other populations and possibl
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