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Forest bats of Madagascar: results of acoustic surveys

100%

Kofoky A. F., Randrianandrianina F., Russ J., Raharinantenaina I., Cardiff S. G., Jenkins R. K. B., Racey P. A.

Acta Chiropterologica

2009

tom 11

nr 2

Spectral and temporal features of echolocation calls produced by 15 insectivorous bat species in three families from Madagascar are described. In addition we provide a library of bat vocalizations that can be used for acoustic inventories involving heterodyne and time-expansion bat detectors. Time-expanded recordings of calls from 153 bats from 15 species were analyzed using five commonly used temporal and frequency variables measured from spectrographs. Echolocation calls for six species (Scotophilus tandrefana, S. marovaza, Emballonura tiavato, Neoromicia spp., N. malagasyensis and Triaenops auritus) are described for the first time. A discriminant function analysis revealed that a function based on the five measured variables provided a correct overall classification of 82.2%. Three groups of echolocation calls based upon the temporal and frequency characteristics of calls are recognized. The Constant Frequency group consists of hipposiderids and Emballonura spp., the Frequency Modulated/Quasi-Constant Frequency group is dominated by vespertilionids, and one species, Myotis goudoti, is in the Frequency Modulated group. Further we describe the utility of using acoustic sampling in inventory and monitoring studies, and in investigations of habitat use.

Habitat use and conservation of bats in rainforest and adjacent human-modified habitats in eastern Madagascar

100%

Randrianandrianina F., Andriafidison D., Kofoky A. F., Ramilijaona O., Ratrimomanarivo F., Racey P. A., Jenkins R. K. B.

Acta Chiropterologica

2006

tom 08

nr 2

We used roost searches, mist netting and acoustic sampling to investigate the habitats used by bats in Parc National de Mantadia and the Réserve Spéciale d'Analamazaotra, eastern Madagascar. Four species were caught in relatively intact humid forest (Myotis goudoti, Miniopterus manavi, Miniopterus majori and Emballonura atrata) two in agricultural land, Neoromicia matroka and Neoromicia melckorum, and one, Rousettus madagascariensis, in Eucalyptus plantations. Mormopterus jugularis, Chaerephon pumilus and Mops leucostigma were found roosting in buildings ca. three km from the humid forest. Acoustic sampling revealed that Neoromicia spp. and molossids were ubiquitous and were recorded from intact and degraded humid forest, Eucalyptus plantations and agricultural land. Myotis goudoti showed the strongest association with intact humid forest. Taxon richness, determined by acoustic sampling, was highest in humid forest but activity was highest in plantations and agricultural land. Mixed-habitat landscapes that surround protected forests and consist of a mosaic of regenerating forest, agriculture, wetlands, villages and plantations are important for bats and promote chiropteran diversity because they provide roosting and foraging sites for species that rarely use intact forest. The humid forests of eastern Madagascar have lower bat diversity than the island's western deciduous karst forests.

Habitat use by the endemic Malagasy bat Hipposideros commersoni in a littoral forest

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Razafimanahaka J. H., Ralisata M., Randrianandrianina F., Jenkins R. K. B., Ratsirarson J., Racey P. A.

Acta Chiropterologica

2016

tom 18

nr 2

We investigated habitat use by the endemic Malagasy bat Hipposideros commersoni in evergreen littoral rainforest during the wet season in 2006, in order to better inform conservation guidelines. We used radiotracking to locate roosting and foraging sites. Roosts, typically 5.4 ± 0.2 m from the ground, were always occupied by single bats and were found on branches of trees with a diameter at breast height of 8.2 ± 0.7 cm. Home range size was 31.8 ± 9.2 ha for males and 41.7 ± 12.9 ha for females. Roosts were always located within the foraging areas and only five (5.4%) of the 91 located were situated outside the sheltered littoral forest. Foraging bats made greatest use of natural, sheltered littoral forest and relatively few foraging sorties occurred beyond the forest edge. Females were not trapped during January and may undergo local movements at that time. There are no known caves in the vicinity of the study area and H. commersoni roosted only on trees. Previous studies in Madagascar have highlighted the importance of caves for bats and we now extend this to include tree roosts, within the evergreen rainforest.

Ograniczanie wyników

3 Acta Chiropterologica

3 Jenkins R. K. B.

3 Racey P. A.

3 Randrianandrianina F.

2 Kofoky A. F.

1 Andriafidison D.

1 Cardiff S. G.

1 Raharinantenaina I.

1 Ralisata M.

1 Ramilijaona O.

1 Ratrimomanarivo F.

1 Ratsirarson J.

1 Razafimanahaka J. H.

1 Russ J.

1 2016

1 2009

1 2006

Wyniki wyszukiwania

Forest bats of Madagascar: results of acoustic surveys

Habitat use and conservation of bats in rainforest and adjacent human-modified habitats in eastern Madagascar

Habitat use by the endemic Malagasy bat Hipposideros commersoni in a littoral forest