Showing posts with label Radiotelemetry. Show all posts
Showing posts with label Radiotelemetry. Show all posts

Monday, September 25, 2017

[Herpetology • 2017] Preliminary Estimation of Home Range Size for Meristogenys orphnocnemis, A Common Bornean Ranid, in An Altered Forest Ecosystem using Radiotelemetry


Meristogenys orphnocnemis (Matsui, 1986)

[upper] Female Meristogenys orphnocnemis showing transmitter and attachment belt.
[lower] Section of stream in SAFE Project experimental site, known as logged forest edge (LFE) stream, where all radiotracking occurred.

RAFFLES BULLETIN OF ZOOLOGY. 65

Abstract

 We tracked six female Meristogenys orphnocnemis for 17 ± 4.3 days (11.5–22 days) in Sabah, Malaysian Borneo to determine core area (home range size) and movement patterns. We found that the core usage area was 3351.0 ± 963.4 m2 . Mean distance of each female from the stream during tracking was between 4.9–29.3 m and median distance from the stream for individual females was 4–20 m. Net distance between first and last observation was 80.6 ± 24.5 m, and there was no relationship between number of days tracked and total distance traversed or core area size, nor between body size and core area size, though our sample sizes were likely too small to detect such patterns. We suggest additional radio-tracking to determine differences in movement ecology between sexes and across species, to better predict impacts on anurans from logging and fragmentation in Southeast Asia.

 Key words. behaviour, radio-tracking, frogs, Malaysia



Fig. 1. Section of stream in SAFE Project experimental site, known as logged forest edge (LFE) stream, where all radiotracking occurred.

 Jennifer A. Sheridan, Nicolas Rakotopare and Rachel Mebberson. 2017. Preliminary Estimation of Home Range Size for Meristogenys orphnocnemis, A Common Bornean Ranid, in An Altered Forest Ecosystem using Radiotelemetry. RAFFLES BULLETIN OF ZOOLOGY65; 539–544. 

    

Sunday, March 10, 2013

[Herpetology • 2013] Spatial Ecology of Rainbow Frog Scaphiophryne gottlebei in the Canyons of the Isalo Massif, Madagascar | Frogs radio-tracked for first time in Madagascar


A radio-tagged Scaphiophryne gottlebei individual from the Zahavola site.
Photo by Gonçalo Rosa

Abstract
The Rainbow Frog Scaphiophryne gottlebei lives within the humid canyons that cross the Isalo Massif, central-southern Madagascar. Knowing that a single haplotype dominates the largest part of its distribution range raised questions about the dispersal ability of the species. We affixed external radio transmitters to 36 individuals of S. gottlebei to understand whether the adults of this species actively displaced from the canyon they inhabit. We studied 13 males and 7 females in 2009 and 7 males and 9 females in 2011 over two periods (November–December 2009 and January–February 2011). Study sessions were chosen due to the different meteorological conditions: the first is the beginning of the rainy season, which corresponds to the start of reproduction; and the second being the end of the rainy season, which corresponds to a wetter period during which individuals are more likely to be feeding in order to increase body weight. Our results revealed that there is no significant difference in the activity patterns between sexes and that rain and temperature stimulate the dispersal rate. The distance covered by the individuals did not differ between males and females; the range varied from a few centimeters to approximately 50 m, although two individuals displaced more than 100 m in a single day. These data suggest that individuals of this species are quite phylopatric to the canyons they inhabit. The generalized haplotype sharing observed might then be explained by passive dispersal of larvae and metamorphosed individuals during the intense cyclonic floods.

Keywords: Amphibians, Ecology, Radiotelemetry, Rainbow Frog


Franco Andreone, Paolo Eusebio Bergo, Vincenzo Mercurio, and Goncalo M. Rosa. 2013. Spatial Ecology of Scaphiophryne gottlebei in the Canyons of the Isalo Massif, Madagascar. Herpetologica, 69(1), 11–21. http://dx.doi.org/10.1655/HERPETOLOGICA-D-12-00005

2003. A Radio Transmitter Belt for Small Ranid Frogs



Frogs radio-tracked for first time in Madagascar | Scaphiophryne gottlebei 

Researchers have radio-tracked frogs for the first time in Madagascar. The effort, undertaken by a group of European scientists, is detailed in the current issue of Herpetologica.