Jia Jet ONG and Indraneil DAS.Trophic Ecology of Ansonia latidisca at Gunung Penrissen, Sarawak, North-Western Borneo[J].Asian Herpetological Research(AHR),2021,12(2):250-260.[doi:10.16373/j.cnki.ahr.200069]

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Trophic Ecology of Ansonia latidisca at Gunung Penrissen, Sarawak, North-Western Borneo

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Asian Herpetological Research[ISSN:2095-0357/CN:51-1735/Q]

Issue:

2021 VoI.12 No.2

Page:

250-260

Research Field:

Publishing date:

2021-06-25

Info

Title:

Trophic Ecology of Ansonia latidisca at Gunung Penrissen, Sarawak, North-Western Borneo

Author(s):

Jia Jet ONG and Indraneil DAS

Institute of Biodiversity and Environmental Conservation, Universiti Malaysia Sarawak, Kota Samarahan 94300, Sarawak, Malaysia

Keywords:

Ansonia latidisca ;  Borneo;  diet;  ecology;  Malaysia;  Sarawak

PACS:

-

DOI:

10.16373/j.cnki.ahr.200069

Abstract:

Dietary data on Ansonia latidisca , the little known Bornean Rainbow Toad, are presented, through an investigation of a population at Gunung Penrissen, Sarawak, Malaysia (north-western Borneo), at elevations between 1,100–1,229 m asl. Standard sampling techniques, including visual encounter surveys, were employed and individuals encountered stomach-flushed, marked, and released. The volume of food ingested by adults, apart from large females, did not vary monthly, and there was no significant difference between wet and dry periods, the dominance index between the two periods showing no significant difference, indicating that seasonal variation does not affect the dietary constitution of the species across months. The mean longest prey was recovered from a female in March, during the end of the wet season. Larger individuals did not consume larger prey in the species, although larger females did harvest the largest insects, and as may be expected, had fewer prey items in their stomachs at the time. Males fed on fewer prey items than females, the adult male diet predominantly comprised of members of the Hymenoptera, including formicids (ants), as indicated by percentage frequency of occurrence of 78.69, while for adult females, equivalent figure was 90.70. Coleopterans (beetles) were found secondary in importance (48.8% in females, 5.85% in males), the rest categorized as tertiary. Plant items (including bryophytes) had a high frequency of occurrence (23.3% in females, 4.64% in males). Females examined in the month of July had voluminous stomach contents, and may have eaten more to increase fat reserves for breeding in the upcoming wet season. Since the diet of all size classes consisted of hymenopterans (ants) and coleopterans, the study species is here considered to have a narrow food preference, and consequently, is a dietary specialist.

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