Habitat use by Siberian warbler species at a stopover site in Far Eastern Russia

Knowledge of the routes and habitat use of Siberian songbird species during migration is very limited. The goal of our study was to describe the autumnal habitat use of seven Siberian warbler species in the genera Phylloscopus, Acrocephalus, Iduna and Locustella in Far Eastern Russia. A total of 2283 individuals were trapped in mist nets placed within different habitat types between 2012 and 2014 as part of the Amur Bird Project at Muraviovka Park in Far Eastern Russia. We studied the effect of habitat type and vegetation height on the occurrence of each species, and compared our results to published information on habitat use on the breeding grounds. Our results demonstrate that most species exhibit species-specific preferences for habitat type, and that these stopover habitats were similar to habitats used on the breeding grounds. © 2018 British Trust for Ornitholog

Song plasticity over time and vocal learning in clay-colored thrushes

Songbirds have been traditionally classified into close-ended or open-ended learning species according to the length of the sensitive period during which birds are able to memorize new vocalizations. Closed-ended learners are generally not capable of changing their song after the first year of life, while open-ended learners show song plasticity as adults. A few Turdus species have been sug- gested to be open-ended learners, but no long-term study has been conducted to investigate their song plasticity over time. We analyzed the songs of clay-colored thrushes, T. grayi, over four successive breeding seasons to assess song plasticity in their syllable repertoires within and between breeding seasons. A total of 16,262 syllables were classi- fied through visual inspection of spectrograms and multi- dimensional scaling analysis based on spectrogram correlations. On average, 563 ± 153 (SD) syllables per male per breeding season were analyzed. Male repertoire size was 9–20 syllable types. Males were capable of modifying their syllable repertoire between the initial and final periods of the breeding season. Song plasticity within breeding seasons may be associated with imitation between neighboring males, suggesting song learning in males that were C2 years old. This short-term plasticity is not enough, however, to explain the high proportion of change (mean = 65 % syllable types) in repertoire composition between breeding seasons in adult males. Song plasticity resulting from annual changes in repertoire composition could be explained by open-ended learning, but another mechanism, extended memory and re-expression, could also explain long-term plasticity. Experimental studies controlling the acoustic environment are needed to determine which mechanism is responsible for such a high level of song plasticity.UCR::Vicerrectoría de Docencia::Ciencias Básicas::Facultad de Ciencias::Escuela de Biologí

OBSERVATIONS ON NESTING AND NESTLING GROWTH IN THE RUSTY-MARGINED FLYCATCHER MYIOZETETES-CAYENENSIS IN SOUTHEASTERN PERU

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Hepatozoon kabeeni n. sp. [Protozoa: Apicomplexa; Hemogregarina] from the Sedge Warbler, Acrocephalus schoenobaenus [Aves: Passeriformes]

New species, Hepatozoon kabeeni was described in' blood of Sedge Warbler Acrocephalus schoenobaenus. The parasite species was detected in two populations of Sedge Warbier in NE and SW parts of Poland. Hepatozoon kabeeni was found respectively in 36.0% (n=25) and 28.6% (n=28) of individuals

Hepatozoon kabeeni n. sp. [Protozoa: Apicomplexa; Hemogregarina] from the Sedge Warbler, Acrocephalus schoenobaenus [Aves: Passeriformes]

New species, Hepatozoon kabeeni was described in' blood of Sedge Warbler Acrocephalus schoenobaenus. The parasite species was detected in two populations of Sedge Warbier in NE and SW parts of Poland. Hepatozoon kabeeni was found respectively in 36.0% (n=25) and 28.6% (n=28) of individuals