| Titre : | Pitfalls during Marsh Tit Parus palustris surveys in West-Brabant (1999) |
| Auteurs : | Hidde Bult, Auteur |
| Type de document : | Article |
| Dans : | Limosa (72(3) 1999) |
| Article en page(s) : | 85-88 |
| Résumé : | The first (Fig. 1, Teixeira 1979) and many subsequent (Sovon 1987) records of Marsh Tit in West-Brabant are solely based on registrations of song or calls by myself and similar "outsiders", i.e. birders coming from areas where this species is much more common. Later I noticed that the call of the Marsh Tit, until then assumed to be diagnostic (cf. Cramp and Perrins 1993), can be "mimicked" by Red squirrel Sciurus vulgaris and most other Parus-species. Moreover, occasional aberrant songs of Blue Tit P. caeruleus are indistinguishable from that of a Marsh Tit. Since 1988, keen local birders failed to discover Marsh Tits during a thorough survey of West-Brabant, but again a few territories were reported by "outsiders". To investigate the puzzling status of the Marsh Tit, a tape with calls and two song variants was repeatedly played during one to three visits to the sites in West-Brabant. The technique proved to be highly efficient and a single visit elicited reactions in 67% of the territories in Terworm (Limburg), a stronghold of the species. In contrast, not a single Marsh Tit was found at 24 sites where it was reported from in West-Brabant, only territories of mimicking species were apparent. Moreover, 80% of the territories of tit species with a similar registration efficiency was relocated after three visits to the Liesbos (Tab. 1). It thus seems that the presence of Marsh Tits in West-Brabant is questionable and that future claims should be perfectly documented in view of the likelihood of pitfalls. |
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