Bats provide us with important ecosystem services including insect population controllers in agri... more Bats provide us with important ecosystem services including insect population controllers in agricultural areas. Studies on bats and insect abundance in Malaysian rice fields are still lacking. Two harp traps and two mist nets were used to trap bats at the Gunung Keriang while a light trap was used to sample insects in the rice field area at three identified sites. A total of 2499 bats from 27 species were captured and for insect abundance a total of 161,539 individuals from 11 orders were captured. Rhinolophus pusillus was recorded as the dominant bat species in all seasons. In the dry season, the dominant insect pest was Chilo polychrysus (Stem borer) and in the wet season, Nilaparvata lugens (Brown planthopper) the dominant insect pest species. Insects from the Order Coleoptera (the dominant insect Order in dry season) may be eaten by bats that have a larger body size and that have a strong bite force. Due to high food availability and insect abundance, the peak time of bat forag...
Recordings of bat echolocation and social calls are used for many research purposes from ecologic... more Recordings of bat echolocation and social calls are used for many research purposes from ecological studies to taxonomy. Effective use of these relies on identification of species from the recordings, but comparative recordings or detailed call descriptions to support identification are often lacking for areas with high biodiversity. The ChiroVox website (www.chirovox.org) was created to facilitate the sharing of bat sound recordings together with their metadata, including biodiversity data and recording circumstances. To date, more than 30 researchers have contributed over 3,900 recordings of nearly 200 species, making ChiroVox the largest open-access bat call library currently available. Each recording has a unique identifier that can be cited in publications; hence the acoustic analyses are repeatable. Most of the recordings available through the website are from bats whose species identities are confirmed, so they can be used to determine species in recordings where the bats wer...
Recent reports of the use of ultrasound for communication by nocturnal mammals have expanded our ... more Recent reports of the use of ultrasound for communication by nocturnal mammals have expanded our understanding of behaviour in these animals. The vocal repertoire of colugos has so far only been known to include audible sound. Here, we report the use of ultrasound calls by Sunda colugos (Galeopterus variegatus, order Dermoptera). We recorded one type of call emitted by seven individuals with mean individual frequencies between 37.4 ± 0.6 and 39.2 ± 0.7 kHz during its maximum energy and lasting 28.7 ± 1.6 to 46.9 ± 21.1 ms. Each call showed 3–36 sequential pulses with individual mean interpulse intervals between 423.0 ± 101.4 and 1230.0 ± 315.4 ms. High frequency calls may serve as cryptic anti-predator alarm calls. Our observations suggest that more species of nocturnal mammals may use ultrasound to communicate, and that further studies are needed to determine the occurrence, function and diversity of these calls.
Bats provide us with important ecosystem services including insect population controllers in agri... more Bats provide us with important ecosystem services including insect population controllers in agricultural areas. Studies on bats and insect abundance in Malaysian rice fields are still lacking. Two harp traps and two mist nets were used to trap bats at the Gunung Keriang while a light trap was used to sample insects in the rice field area at three identified sites. A total of 2499 bats from 27 species were captured and for insect abundance a total of 161,539 individuals from 11 orders were captured. Rhinolophus pusillus was recorded as the dominant bat species in all seasons. In the dry season, the dominant insect pest was Chilo polychrysus (Stem borer) and in the wet season, Nilaparvata lugens (Brown planthopper) the dominant insect pest species. Insects from the Order Coleoptera (the dominant insect Order in dry season) may be eaten by bats that have a larger body size and that have a strong bite force. Due to high food availability and insect abundance, the peak time of bat forag...
Recordings of bat echolocation and social calls are used for many research purposes from ecologic... more Recordings of bat echolocation and social calls are used for many research purposes from ecological studies to taxonomy. Effective use of these relies on identification of species from the recordings, but comparative recordings or detailed call descriptions to support identification are often lacking for areas with high biodiversity. The ChiroVox website (www.chirovox.org) was created to facilitate the sharing of bat sound recordings together with their metadata, including biodiversity data and recording circumstances. To date, more than 30 researchers have contributed over 3,900 recordings of nearly 200 species, making ChiroVox the largest open-access bat call library currently available. Each recording has a unique identifier that can be cited in publications; hence the acoustic analyses are repeatable. Most of the recordings available through the website are from bats whose species identities are confirmed, so they can be used to determine species in recordings where the bats wer...
Recent reports of the use of ultrasound for communication by nocturnal mammals have expanded our ... more Recent reports of the use of ultrasound for communication by nocturnal mammals have expanded our understanding of behaviour in these animals. The vocal repertoire of colugos has so far only been known to include audible sound. Here, we report the use of ultrasound calls by Sunda colugos (Galeopterus variegatus, order Dermoptera). We recorded one type of call emitted by seven individuals with mean individual frequencies between 37.4 ± 0.6 and 39.2 ± 0.7 kHz during its maximum energy and lasting 28.7 ± 1.6 to 46.9 ± 21.1 ms. Each call showed 3–36 sequential pulses with individual mean interpulse intervals between 423.0 ± 101.4 and 1230.0 ± 315.4 ms. High frequency calls may serve as cryptic anti-predator alarm calls. Our observations suggest that more species of nocturnal mammals may use ultrasound to communicate, and that further studies are needed to determine the occurrence, function and diversity of these calls.
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Papers by Nurul Elias