West Peruvian Screech Owl
Megascops roboratus pacificus
Datum | 7 February 2020 |
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Locatie | Jorupe - Ecuador |
Fotograaf | Henk Hendriks |
Bekeken | 4645 × |
West Peruvian Screech Owl in Zuid Ecuador. Nog een soort die zowel in Ecuador als het noorden van Peru voorkomt en een van de 13 soorten uilen die we waarnamen tijdens onze trip. De veel zeldzamere Buff-fronted Owl die vlakbij riep helaas niet kunnen verleiden om zich te laten zien. |
Discussie
George Sangster
·
30 March 2020 13:28
König, C 2000. Owl vocalizations as interspecific differentiation patterns and their taxonomical value as ethological isolating mechanisms between various taxa. In: R.D. Chancellor & B.-U. Meyburg (eds). Raptors at risk: 781-794. Berlin and Blaine.
Citaat (p. 791):
"In the Peruvian Screech Owl (Otus roboratus) two “subspecies” differing very much in size have to be recognized. Their vocalizations are said to be similar (Johnson & Jones 1990), but there are differences, which might suggest specific separation. Like other screech owls, the Peruvian Screech Owl has two different songs: the territorial advertising (A-song) and a courtship, resp. aggressive song (B-song). In the dwarfish lowland form pacificus the A-song shows a distinctly slower sequence of notes in a trill than in roboratus, while in the latter the harmonics (overtones) are much more pronounced. In the B-song of pacificus the notes are accelerated towards the end of the short trill, first rising and finally falling in pitch (Hardy et al. 1989). In roboratus the B-song is longer and consists of equally-spaced “staccato”-notes uttered with a somewhat “undulating” quality in pitch (Figs. 18 and 19). Larger differences may be noted in the calls (see Johnson & Jones 1990!). I therefore cannot support the idea of Johnson & Jones (1990), who treat the taxon pacificus as subspecies of Otus roboratus, which is a relatively large Otus, living in mountainous regions. I suggest to give the dwarfish Pacific taxon from northwestern coastal Perú and western coastal Ecuador species rank, calling it Otus pacificus, the Tumbes Screech Owl."
Dušan Brinkhuizen
·
30 March 2020 17:01
en roboratus = Marañon Screech Owl.
Peter de Rouw
·
30 December 2020 22:55, gewijzigd 30 December 2020 23:17
Makes sense. Voor wat opnamen van die avond: https://observation.org/waarneming/view/196775815.
Ook te vinden op xeno-canto uiteraard.
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