08 April 2017

IPSG Talk @ Deyi Secondary School

IPSG Talk at Deyi Secondary School
Introduction to Butterflies


A group of teachers from the IPSG session at the Deyi Secondary School butterfly garden

Last week, I was invited to give a talk about butterflies to a group of teachers at Deyi Secondary School. The Principal of the school, Mrs Lim AP, had recently set up a butterfly garden in her school grounds and thought that a sharing session amongst her teachers would be useful. Coincidentally, she had a Science Instructional Programme Support Group (IPSG) of Cluster N6 that day, so we had another group of teachers from schools within the cluster who joined the talk.



Many of the teachers had biology background and hence it was easier to use basic taxonomic terms about butterflies without having to elaborate on the technicalities of the terms. My talk was calibrated more for the layman, and covered basic topics like butterfly morphology, behaviour, ecology and conservation.



Teaching the teachers about butterflies at the sharing session

It is always interesting to observe how people are surprised to learn of the rich butterfly diversity on our little red dot. Taking into account the seasonal migrants, we have recorded 331 species in Singapore at the end of 2016. Obviously, discoveries and re-discoveries will continue - both at the technical level and also at the field observation level. There will always be surprising finds every year, and we hope that even within the 714 sq km of our little island, lurks species that have been hidden from us all these years.



Given the teacher-centric audience, I also launched my typical quiz on the identification between butterflies and moths. As with previous audiences, it was always fun to see how people have preconceived ideas of what they consider are moths, and what butterflies should look like. In so far as I've surveyed, most beginners would not get a clear "pass" on the quiz. Although biologically, both butterflies and moths fall under Lepidoptera, the layman has always been curious about the differences between a butterfly and a moth.



In the one hour talk, the audience was kept alert and intrigued about butterflies and I was glad to see that most were quite interested at the information provided. I suppose having lots of pretty pictures of butterflies helped in what could have been a 'boring' subject to some.



Some hands on experience with caterpillars.  Tian reassuring the teachers that butterfly caterpillars are quite harmless

I was assisted by my two friends Tian HM and Or CK. Tian was the man behind the landscaping of the butterfly garden at Deyi Secondary School and he conceptualised the planting beds and the species of host and nectaring plants to attract butterflies to the garden. CK helped with recording the talk and her bubbly personality is always welcome at any gathering.



After the talk, we brought the group out to the butterfly garden facing Ang Mo Kio Street 42. It was a quiet corner of the school, slightly away from the buildings and partially shaded by some trees. Despite its proximity to the road, the site was slightly elevated and hence provided a relatively conducive area for butterflies to roam about.


Visiting the butterfly garden

Tian did a good job of mixing host plants, nectaring plants and other filler plants in the small area of about 250m2 that formed the butterfly garden. Even at the late hour of almost 5pm in the evening, we spotted species like the Common Grass Yellow, Chestnut Bob, Striped Albatross and Chocolate Pansy fluttering around. We also saw caterpillars of the Leopard Lacewing, Tawny Coster and Plain Tiger on the host plants.




Caterpillars in the butterfly garden, and educational signage on the plants that have been cultivated at the butterfly garden to attract butterflies

A group of students from the school was at the butterfly garden, and as expected some of them were quite freaked out by the caterpillars and dared not touch them. It is a fundamental consideration when architects and landscape designers talk about biophilic design (originating from the innate tendency of humans to seek connections with nature and other forms of life) and infusing our built environment with plants (and the biodiversity that comes with them). Though biophilia is normally considered from the human perspective, a large segment of our population tends to be rather selective at what they consider as an affiliation for "all" things nature.



I had previously observed that over the past few decades, the typical Singaporean growing up in our sanitised environment and HDB apartments tend to shun the "wilder and untidier" side of nature. This may have, in certain situations, drawn a line between biophilia and biophobia. To some, if even the totally harmless butterfly can be perceived to be a "dangerous critter" to be feared and avoided, what more an ugly looking caterpillar!



The setting up of butterfly gardens in schools is a good step in the biodiversity conservation efforts in our city in a garden. More of these school gardens, together with a growing network of community butterfly gardens, park connectors, urban parks and the nature reserves will go a long way in improving our butterfly conservation efforts in Singapore. Deyi SS should be lauded for taking the extra effort to set up their own garden, and a critical success factor is the enthusiasm behind the leadership and the teachers of such schools who are key behind the success and sustainability of such butterfly gardens in school premises.


Principal of Deyi SS, Mrs Lim AP and me. :)

In any case, I was glad to be of help in the educational efforts in biodiversity conservation, in particular the appreciation and understanding of butterflies. The journey of sharing knowledge and nurturing new advocates of butterflies and their conservation in our urban greenery is a long one. But every little bit counts as we build a society that cares for the environment as much as our human aspirations for better living conditions.

Text by Khew SK : Photos by Or Cheng Khim

Special thanks to Mrs Lim AP, Principal / Deyi Secondary School and the teachers of IPSG Science Group Cluster N6, who attended the talk.  Thanks also to Tian HM and Or CK for assisting during the talk and site visit to the butterfly garden

01 April 2017

Favourite Nectaring Plants #9

Butterflies' Favourite Nectaring Plants #9
The Chinese Violet (Asystasia gangetica micrantha)


A Malay Lacewing feeds on the flower of the Chinese Violet

The feature plant in this article of our series on butterflies' favourite nectaring plants is the Chinese Violet. This tough widespread "weed" can be found in a number of habitats in Singapore, particularly in areas which have been cleared and awaiting development, or left to remain wild. It can be found growing in unkempt gardens to secondary forested areas to back-mangroves, usually as a low ground cover.


The Chinese Violet plant, with its delicated white and purple flowers

The Chinese Violet is a member of the family Acanthaceae, which features many butterfly host plants amongst the 2,500+ species in the family. The Chinese Violet is no exception, being a host plant for several Nymphalidae species like the Autumn Leaf, Blue Pansy and Great/Jacintha Eggfly. This species originated from sub-Saharan Africa, but has become naturalised in Asian countries like Singapore, where it grows rapidly in the hot humid climate.



This herbaceous plant spreads quickly and is able to climb vertically up to 1m or more, if supported. It does not appear to be particularly fussy about its substrate soils, and can appear in relatively harsh environments all across Singapore, although it prefers semi-shaded conditions to grow best. It roots easily when its stems and nodes come into contact with moist soil. Cuttings sprout white roots within 3-4 days if left in water, and the plant can easily be propagated this way.

Plant Biodata :
Family : Acanthaceae
Genus : Asystasia
Species : gangetica
Sub-species : micrantha
Synonyms : A. coromandeliana, A. intrusa, Justicia gangetica, Ruellia intrusa
Country/Region of Origin : Africa, Tropical regions
English Common Names : Chinese Violet, Common Asystasia, Creeping Foxglove, Ganges Primrose
Other Local Names : Ara Songsang, 赤边樱草, 十万错花


The paler green underside of the Chinese Violet leaf

The opposite pairs of leaves occur at right angle to each other

The green leaves are simple, opposite and decussate (successive pairs of opposite leaves occur at right angle to each other). Each leaf is ovate or heart-shaped, sparsely hairy, smooth-edged and ranges between 3 to 7.5cm long. The plant grows upright on squarish stems that have ribs and short hook-like hairs.


The flower of the Chinese Violet with the purple lower lip

The flowers are in small, one-sided racemes at the stem tips, with the flowers at the bottom of the raceme opening first. Flowers of the Chinese Violet are small and tubular, each up to 3.5cm long. There are usually 6 to 10 flowers borne on each raceme. The calyx has 5 rounded lobes, purple, vein-ridged markings on the lower lip, and 4 stamens. This species is free-flowering throughout the year. These bisexual flowers attract insects including various species of butterflies to act as pollinators in the reproduction process.


Buds, flowers and fruits of the Chinese Violet

Explosively dehiscent fruits, which come in club-shaped capsules, are initially green, but becomes brown and dry after dehiscence (3.6 cm long). The fruit resembles an upside down cello and contains 4 whitish to brownish black, circular seeds which are flattened and beaked (5 mm long, 1 mm thick). Fruits contain 3 mm-long hooks which help to propel the seeds further away from the plant during explosive dehiscence.


Ripened fruit and seeds of the Chinese Violet

In some parts of Africa, the leaves are eaten as a vegetable and used as an herbal remedy in traditional African medicine. The leaves are used in many parts of Nigeria as a traditional African medicine for the management of asthma. In Australia, this species is considered invasive and a serious threat to native ecosystems, and sightings of the Chinese Violet have to be reported to the authorities.


Flower of the Chinese Violet, where a spider tries to remain 'hidden' to wait for unwary prey coming to feed on the flower

Besides being host plant to several butterfly species, the white/violet flowers of the Chinese Violet is rather attractive to the adult butterflies. The 'universality' of the flower of this plant to butterflies is interesting, as we have seen species from 5 out of the 6 butterfly families feeding on it. With the exception of Riodinidae, representative species from Papilionidae, Pieridae, Nymphalidae, Lycaenidae and Hesperiidae have been regularly observed sipping nectar from the flowers of the Chinese Violet.



The bigger swallowtails also like to feed on the flower of the Chinese Violet

Of the Papilionidae, we have seen these larger swallowtails fluttering at the white/violet flowers of the Chinese Violet with their long proboscis extended deep into the flower. Species observed are the Common Mormon, Lime Butterfly, Common Mime, and even a Blue Helen, although it is often difficult to photograph these species moving rapidly from flower to flower with their forewings constantly flapping in the usual Papilionidae fashion.




The Grass Yellows feeding on the flower of the Chinese Violet.  Note how they have to poke their heads deep into the flower to get at the nectar within the flower.

Amongst the Pieridae, the Grass Yellows (Eurema spp.) are most often seen stopping and pushing their heads deep into the flower of the Chinese Violet. Perhaps the shorter proboscis of the smaller Grass Yellows cannot extend far enough into the flower to reach the nectar, so they need to push their heads further in to get at their liquid diet.





The Tigers and Plain Lacewing reaching into the flower to get at the nectar

The large Danainaes and Nymphalinaes from the family Nymphalidae are quite regularly spotted to feed on the nectar from the Chinese Violet flowers. As with the Pieridae, even these larger butterflies are observed to push their heads deep into the flower (often giving a "headless" butterfly shot) when their heads are out of sight whilst they feed at the flower. Species featured here include the Common Tiger, Dark Glassy Tiger, Plain Lacewing and Malay Lacewing are some examples of the Nymphalidae that feed on the Chinese Violet flowers.




The diminutive Lycaenidae are also attracted to the flower of the Chinese Violet. Being small butterflies with fine proboscis, the Lycaenidae also have to reach far into the flower to get at the nectar.





Skippers love the flower of the Chinese Violet

In the early morning hours, look for the Hesperiidae (Skippers) zipping amongst the low bushes of the Chinese Violet, reaching far into the flower with their long proboscis to feed on the nectar. From the photo records of ButterflyCircle members, it appears that a larger number of different species of Hesperiidae have been observed feeding on the flower of the Chinese Violet than any other family.



Despite being an unwanted weed found in wastelands, unkempt patches of greenery and cleared patches of sites awaiting redevelopment, the Chinese Violet is a valuable plant that is used for sustenance by Singapore's butterflies. It is a caterpillar host plant for at least 3 species of butterflies, and a nectaring plant for a good variety of species of butterflies.



So when you are out butterfly-watching, do keep a lookout for these 'white dots' amongst the low green shrubbery and ground cover - these are the pretty flowers of the Chinese Violet. Watch for the butterflies that feed on these white/violet flowers and add on to the list of species that you can see here, that use the Chinese Violet flower as a nectar source.

Text by Khew SK : Photos by Sunny Chir, Chng CK, Federick Ho, Khew SK, Loke PF, Horace Tan and Mark Wong

25 March 2017

Butterfly of the Month - March 2017

Butterfly of the Month - March 2017
The White Banded Awl (Hasora taminatus malayana)



March seemed to have come and (almost) gone in a flash. This is the last Saturday of the month, and I almost forgot to showcase our feature butterfly for this month on the blog! March seemed like a short month, after all the Lunar New Year festivities and holidays in February came to an end, and everyone settled back to work.



For homeowners who still hold outstanding loans, the US Fed hike in March caused a bit of concern for these SIBOR-linked borrowers. With two more impending rate hikes under the Trump administration in the coming quarters, the days of low-interest loans may be numbered. It will be interesting to see how the global economy changes in these turbulent times. A friend recently shared that business is booming back in the US, and she was swamped with work piling up for the months to come.



A White Banded Awl feeding on the flower of Ixora (top) and puddling on damp concrete (bottom)

This month, I tried the GrabCar app for the first time - ironically, back in my hometown in Penang where I was visiting my parents. This transportation platform, like the more ubiquitous Uber, is one of the disruptive technologies that has radically changed the face of public transportation. I must say that my maiden experience with Grab was largely positive and hassle-free. I merely clicked on the app, set my destination, and the designated car details and driver were sent to me.



Other than a small hitch where the driver missed my pickup location (and I could see on my smartphone tracking his car, that he went off to an adjacent road), the car arrived in about 10 minutes flat from the time I clicked 'confirm booking' on my smartphone. The driver was a Malaysian Indian who was in between jobs. He was polite and very knowledgeable about current affairs and recent news in Malaysia and Penang. All in all, the ride was pleasant and I reached my destination in good time. The best thing was that Grab's fixed fare was only 55% of what a normal taxi would have cost!



Back home in Singapore, I took possession of my new "toy" - a DJI Mavic Pro.  This new high-tech drone (or some prefer to call it 'flying camera') is pretty awesome technology. My first impression of this Chinese-designed-and-manufactured drone was that the finish and quality of the product exceeded all expectations. The amount of technology in the hardware and software is mind-boggling and I am still discovering new things about the drone.



Unfortunately, Singapore is a small island and the number of no-fly-zones and regulatory requirements limit the number of places that one can legally fly the drone. Hopefully, some of these regulations can be relaxed a bit so that responsible recreational drone pilots can help to document Singapore in a totally different perspective and for a variety of useful applications from urban planning to building inspections.



This month, we feature a pretty skipper, the White Banded Awl (Hasora taminatus malayana). This species belongs to the subfamily Coeliadinae of the family Hesperiidae. The subfamily features a number of robust, fast-flying, fat-bodied butterflies commonly referred to as the Awls or Awlets. Many of the species are crepuscular, often seen on the wing in the early hours of the morning and late in the evenings just before dusk.



A typical pose of the White Banded Awl, playing hide-and-seek from under the shelter of a leaf

The White Banded Awl is a forest-dependent species, usually found in the nature reserves in well-shaded localities. It has a habit of flying rapidly and is often observed to settle on the underside of a leaf with its wings folded upright. Once disturbed, it takes off at high speed to search for another hiding place to rest on the underside of a leaf again.


A pristine White Banded Awl puddling on damp concrete

The species is also known to puddle on bird droppings and sometimes found puddling on damp building structures (concrete or wood) in the early morning hours. Occasionally, it is also found feeding off sap on damp tree trunks with its long and distinctive proboscis. When certain forest trees flower, e.g. Syzygium spp. the White Banded Awl may be seen zipping rapidly amongst the flowers and stopping to feed on the nectar.



The male White Banded Awl is dark velvety brown above and unmarked, whilst the female has small pale yellow post-discal spots on the forewings. The underside is pale brown with the wing bases strongly suffused with iridescent bluish-green scales. There is a narrow but distinct white post-discal band on the hindwing. In a side light, the bluish sheen makes it an attractive looking skipper and distinctively different from the majority of brown and sombre looking butterflies in the family.


The White Banded Awl's 'baby photo'

The caterpillar of the White Banded Awl feeds on Derris trifoliata (Sea Derris), a host plant that it shares with at least two other species of butterflies in Singapore.

Text by Khew SK : Photos by Sunny Chir, Khew SK, Koh CH, Loke PF, Nelson Ong, Jonathan Soong and Horace Tan