Member list

Current members

Lan-Wei Yeh
Ecology and evolution of Taiwanese Carabus ground beetles.
Chung-Hsin Huang
Master topic: Flucuating Asymmetry and Developmental Asymmetry of Cyclommatus mniszechi; PhD topic: Evolution of Mandible Morphology and Fighting Behavior in Stag Beetles
Ying-Yuan Lo
Systematics, Behavior and Evolution of Lynx Spiders.
Leocris Batucan Jr.
New Species and DNA Barcoding of the Mayfly (Ephemeroptera) in Mt. Malindang, Mindanao, Philippines.
Chun-Yu Lin
Parasitoid Wasps of Damselflies; Phylogenetics and Evolution Histories of Treehoppers
Hsu-Yi Lin
Fighting Behavior of Odontolabis siva parryi Stag Beetles
Sheng Lin
Transcriptome Profiling Psolodesmus mandarinus mandarinus Damselfly
Pei-Hsuan Chang
Thermal Adaptation and Habitat Preference of Psolodesmus mandarinus Damselfly
Min-Chen Lin
Disruptive Camauflage of Colors of Pachyrhynchus Weevils.
Masahiko Tanahashi
Ecology and Evolution of Pachyrhynchus Weevils.
Su-Ping Lin
Symbiotic Yeasts of Stag Beetles
Jun-Ying Wang
Conservation of Mortonagrion hirosei Damselflies
Chin-Han Hsiao
Fighting Behavior of Rhaetulus crenatus Stag Beetles
Wei-Zhe Tseng
Systematics and Evolution of Weevils
Cheng-Tse Yung
Maternal Gift of Pachyrhynchus sarcitis Weevils

Past members

Jo-Fan Wang
Territorial behavior, trait evolution.
Yu-Hsun Hsu
Mating strategy, behavioural ecology, molecular ecology, population genetics, molecular phylogenetics, biostatistics.
Yi-Shou Yang
Reproductive Isolation of Psolodesmus mandarinus subspecies.
Wataru Kojima
Evolution of male sexual traits in Taiwanese scarab beetles.
Zhen-Yi Chen
Fighting behavior and reproductive strategy of stag beetles.
Teng-Yu Liu
Fighting behaviour and life history observation of a stag beetle Rhaetulus crenatus crenatus.
Princess Angelie S. Casas
Insect Diversity and Evolution
Lu-Yi Wang
Defense Mechanism of Pachyrhynchus weevils.
Hui-Yun Tseng
Yu-Jen Yu
Variation and Adaptation of wings.
Yen-Ting Chen
Systematics and evolution of insects.
Yun-Chieh Cheng
Damselfly larval diet, molecular evolution.
Tai-Chia Chiang
The effect of aposematic colors of Pachyrhynchus weevils on avian predators.
Yong-Chao Su
Behavioral ecology, sociobiology, population genetics, and molecular phylogenetics.
I-Ting Hsiao
Variation of genitalia in Euphaea amphicyana.
Jyun-Huei Huang
The fighting behavior of a stag beetle, Rhaetulus crenatus.
Shi-Ting Wu
Membracis Phyllotropis.
Chiao-Wei Lin
The fighting behavior of a stag beetle, Rhaetulus crenatus.
Wei-Liang Xiao
Variation of wing veins in Euphaea amphicyana.
Hung-Nien Chen
1. The effect of typhoon on survivalship of Matrona cyanoptera. 2. Modes of phenotypic variation in Euphaea amphicyana.
Chu-Yen Cheng
Phylogeography of a Philippine's treehopper, Leptocentrus reponens.
Che-Yu Kuan
Variation of mandibles in stag beetles.
Yat-Hung Lee
Speciation of Euphaea damselflies.
Ming-Yu Chen
Phylogeography and population history of the treehoppers, Centrochares horifficus from the Philippines Archipelago.
Shao-Chang Huang
Visual Communication of Matrona cyanoptera
Jen-Pan Huang
Population Genetics and Phylogeographic Analyses of Formosan Damselfly, Euphaea Formosa (Insecta: Odonata: Euphaeidae) from Taiwan
Wei-Yun Chen
Molecular and Phylogenetic Characterization of Endosymbiotic Bacteria of the Froghopper, Okiscarta uchidae (Insecta: Hemiptera: Cercopidae)

Visiting scholars and students

Jillian del Sol
Behavioral Ecology; Mating System Ecology; Weapon Ecology and Evolution; Evolutionary Biology
Ian Dela Cruz
New Species and DNA Barcoding of the Stonefly (Plecoptera) in Mt. Malindang, Mindanao, Philippines.
Shinya Komata
Ecology & Evolution of Wing Polymorphism in a Mimetic Swallowtail Butterfly, Papilio memnon.
Vanitha Williams
Predatory potential of waterbug, Diplonychus rusticus and dragonfly, Diplacodes trivialis on mosquito larvae.
Marina Vilenica
Dragonfly composition (Insecta, Odonata) in wetland area of Turopolje region, Croatia
Klaas-Douwe 'KD' B. Dijkstra
History, diversity and identification of dragonflies and damselflies (Odonata).
Erin McCullough
" Diversification of weapon form: aerodynamic costs of beetle horns.
Ashley E. King
Intrasexual combat and intersexual antagonistic co-evolution in horned beetles.

Hui-Yun Tseng

Hui-Yun Tseng


PhD Student 2011-2017

Species: Pachyrhynchus spp.

Pachyrhynchus spp.


Aposematic coloration, island biogeography.


The flightless pachyrhynchid weevils are members of the largest beetle family Curculionidae. Most pachyrhynchid weevils are decorated with colorful and iridescent markings on their bodies, which are extremely rigid with fused elytra. Distributed mainly from the tropical Philippine archipelago north to the Ryukyu islands, these insects represent an astonishingly high level of morphological and species diversity on these oceanic islands. In this study, we focus on three questions in pachyrhynchids: 1. Biological function of colorful markings: the brilliant coloration of pachyrhynchids may function as crypsis, aposematic or mating signals, and we will test these hypotheses using behavioral experiments in the laboratory and field. 2. Phylogeny and color evolution of Pachyrhynchus weevils: using mitochondrial and nuclear genes, we can infer the phylogenetic relationships between taxa differing in color, and reconstruct the evolutionary history of coloration. 3. Degree and direction of gene flow between weevil populations on Lanyu and Green Island: genetic divergence and homogeneity depend on the strength of gene flow among different populations. Many factors may affect the population dispersal and therefore mediate the direction of gene flow. We will analyze the degree and direction of gene flow between pachyrrhynchid populations in Lanyu and Green Island, and test whether the direction is consistent with the flow of Kuroshio currents.

Topic 1

Colours of Pachyrhynchus weevils function as aposematic visual cues for Swinhoe’s tree lizard (Japalura swinhonis)

Japalura swinhonis


Aposematic coloration or warning signals of preys can be used to advertise their un-palatability, therefore deter potential predators. Pachyrhynchus weevils are a group of insects often decorated with colorful and iridescent markings. Because of their extremely rigid elytra and a remarkable similarity between these weevils and other insects (e.g. longhorn beetles and crickets), these colors were considered as aposematic signals. However, there was no scientific evidence supporting this hypothesis. In this study, we used Swinhoe’s tree lizard (Japalura swinhonis) as a predator and two weevil species, P. tobafolius and Kashotonus multipuctatus as prey to examine two hypotheses: 1) the conspicuous coloration function as aposematic signals, and 2) the lizards sympatric with the weevils avoid these prey, whereas allopatric and naïve lizards attack these presumably unpalatable prey. In the first experiment, both P. tobafolius and K. multipuctatus with intact or artificially removed colors were used to test whether sympatric lizards have different predation attempts. The results showed that sympatric lizards attack more frequently on both weevil species without markings than that with markings. In the second experiment, we used sympatric and allopatric lizards to test whether these lizards recognize these weevils as unpalatable prey. The results showed an existence of geographical variation in predation response among lizard populations, where allopatric lizards made significantly more predatory attempts on the weevils than that of sympatric lizards. These findings suggest that the coloration of Pachyrrhynchus weevil functions as an aposematic signal for sympatric Swinhoe’s tree lizard populations.

Selected Publication

Ananjeva, N. B., E. E. Golynsky, S.-M. Lin, N. L. Orlov, Hui-Yun Tseng. 2015. Modeling habitat suitability to predict the potential distribution of the Kelung Cat Snake Boiga kraepelini Steineger, 1902. Russian Journal of herpetology 22(3):197-206. PDF

Lin, W.-L., S.-M. Lin, J.-W. Lin, Y. Wang, Hui-Yun Tseng. 2015. Breeding performance of Crested Goshawk Accipiter trivirgatus in urban and rural environments of Taiwan. Bird Study 62(2): 177-184. PDF

Lin, W.-L., S.-M. Lin, Hui-Yun Tseng. 2014. Colour morphs in the Collared Pygmy Owl Glaucidium brodiei are age-related, not a polymorphism. Ardea 102: 95–99. PDF

Tseng, H-Y., C-P. Lin, J-Y Hsu, D.A. Pike and W-S. Huang. 2014. The functional significance of aposematic signals: geographic variation in the responses of widespread lizard predators to colourful invertebrate prey. PLoS ONE 9(3):e91777. PDF

曾惠芸、林仲平、許嫆雅、黃文山. 2014. 島嶼上的瑰麗珠寶球背象鼻蟲. 科學人雜誌, 201408, p2-4. PDF

Lin, W.-L., L. L. Severinghaus, Hui-Yun Tseng, S.-M. Lin. 2013. Genetic differentiation between migratory and sedentary populations of the Northern Boobook (Ninox japonica), with the discovery of a novel cryptic sedentary lineage. Journal of Ornithology 154: 987-994. PDF

Lin, W.-L., S.-M. Lin, Hui-Yun Tseng. 2012. Breeding ecology of the Northern Boobook Ninox japonica totogo in central Taiwan. Forktail 28: 164-166. PDF

Tseng, Hui-Yun, W.-S. Huang. 2012. Sphenomorphus incognitus (Brown Forest Skink). Parental care. Herpetological Review 43(1): 141. PDF

Lin, W.-L., Y. Wang, Hui-Yun Tseng. 2007. Initial investigation on the diet of Eastern Grass Owl (Tyto longimembris) in southern Taiwan. Taiwania 52(1): 100-105. PDF

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