Biodiversity

Friday, April 06, 2007

INTERACTIVE KEY ON DOLPHINS AND WHALES

Key 5a. Confirmatory characters


Characters: 22 in data, 15 included, 8 in key.
Items: 11 in data, 11 included, 14 in key.
Parameters: Rbase = 1.40 Abase = 2.00 Reuse = 1.01 Varywt = .80
Characters included: 1–2 6–13 15 19–22
Character reliabilities: 1–22,5.0

1(0).
  • Colour dorsal black-blue ... Balaena glacialis
  • Colour dorsal white... Megaptera novaeangliae
  • Colour dorsal black... 2
  • Colour dorsal pale-grey... Delphinus delphis
  • Colour dorsal grey... 5
  • Colour dorsal dark-grey... 6
  • Colour dorsal dark blue-grey... Stenella coeruleoalba

2(1).

  • Echolocation present ... 3
  • Echolocation unknown... 4

3(2).

  • Snout rounded; Dorsal fin absent; Migration unknown; Conseravation status Unknown ... Lissodelphis peronii
  • Snout unknown; Dorsal fin present; Migration yes; Conseravation status Low risk... Orcinus orca

4(2).

  • Snout rounded ... Cephalorhynchus heavisidii, Lagenorhynchus obscurus
  • Snout unknown... Delphinus delphis

5(1).

  • Colour ventral off-white speckled with grey spots; Snout moderate length; Body robust ... Tursiops truncatus
  • Colour ventral grey; Snout unknown; Body very large and prune-like... Physeter macrocephalus

6(1).

  • Snout moderate length ... Tursiops truncatus
  • Snout rounded... Lagenorhynchus obscurus
  • Snout unknown... Sousa plumbea


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