Zoeken
Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.
Boekenmand
Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).
RSS
Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.
nieuwe zoekopdracht
The taxonomic status of the nominal dolphin species Delphinus tropicalis Van Bree, 1971
In: Marine Mammal Science. Society for Marine Mammalogy: Lawrence. ISSN 0824-0469; e-ISSN 1748-7692
|  |
| Trefwoorden |
Delphinus capensis; Delphinus tropicalis Van Bree, 1971 [WoRMS]
Marien/Kust |
| Author keywords |
long-beaked common dolphin; Delphinus capensis; Delphinus tropicalis; taxonomy; skull morphology; geographic variation; Indo-Pacific region; Indian Ocean |
| Auteurs | | Top |
- Jefferson, T.A.
- Van Waerebeek, K.
|
|
|
| Abstract |
The taxonomic status of common dolphins in the Atlantic and Pacific oceans has been clarified in recent years, with the discovery that there appear to be two species, a short-beaked (Delphinus delphis) and a long-beaked (D. capensis) species. However, the taxonomy of common dolphins in the Indian Ocean and southeast Asia is still unclear. A nominal third species, Delphinus tropicalis van Bree, 1971, has been described from this area, but its validity is controversial. We reviewed records and literature on common dolphins from South Africa east to Australia and Japan, and measured 206 skulls of common dolphins from the Indo-Pacific and southern California. Other than southern Australia, we found no evidence for Delphinus delphis in the Indo-Pacific (South African specimens appear to be D. capensis). Previous reports of short-beaked common dolphins in the Indo-Pacific appear to have been cases of misidentification. The tropicalis-form has an exceptionally long and narrow rostrum with high tooth counts, but otherwise appears to resemble D. capensis, in both skeletal and external morphology. From an examination of 86 Delphinus skulls from the reported range of tropicalis (Middle East to China), we found that both tooth counts and rostral length/zygomatic width ratios were higher than for 94 D. capensis specimens from southern Japan, South Africa, and California. These measurements were greatest in the central Indian Ocean (around India). However, there was evidence of clinal variation, with both decreasing as one moves east or west from India, towards South Africa in the west or Japan in the east. We suggest that the tropicalis-form is actually a long-beaked subspecies of D. capensis, which may hybridize or intergrade with the standard capensis-form in southeast Asia and possibly along the east coast of Africa. The appropriate name is Delphinus capensis tropicalis (van Bree, 1971), and a formal description of the subspecies is provided. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
