Saturday, September 7, 2013

Biogeography in popular culture - Katy Perry's Roar & Transitions Optical TVC


Popular culture usually has an interesting (and often unscientific) depiction of biodiversity. Most of the time, producers tend to take the kitchen-sink approach, where more species or the more iconic species, the better.

Unfortunately, accuracy in biogeography suffers in most cases. Biological communities and species typically vary across geographic space (e.g., continents). The media often depict organisms belonging to more than one biologically distinct geographical regions in the same space. I wonder how this has an impact in shaping people's perception of nature.

This post developed from a rather short twitter post and is meant to take a fun, non-critical look at two memorable examples, one old and one current:

Transitions Optical TVC



This eyewear lens ad depicts a day's work by wildlife cinematographer where a tiger (Panthera tigris) from Asia, scarlet macaws (Ara macao) from South America, an orangutan (Pongo sp.) from Southeast Asia, and a Raggiana bird-of-paradise (Paradisaea raggiana) from New Guinea are seen. Such an assemblage is impossible in the wild in a single forest.

If 4 species of animals of at least 3 different biographic regions are a stretch, the next one stretches reality even further.


Katy Perry - Roar

The forest in Katy Perry's new music video for Roar has a minimum of 12 species of animals from at least 3 continents.



Image: Katy Perry / Columbia Records / Twitter
Asia: 1. Tiger (Panthera tigris), 2. great hornbill (Buceros bicornis)  3. Eclectus parrot (Eclectus roratus), 4. Alexandrine or rose-ringed parakeet (Psittacula sp.).

Africa: 5. African bush elephant (Loxodonta africana), 6. baboon (Papio sp.).

South America: 7. white-headed capuchin (Cebus capucinus), 8. blue and gold macaw (Ara ararauna ) & hybrid (Ara ararauna x Ara macao), 9. Toco toucan (Ramphastos toco).

Unknown: 10. crocodilian, 11. tarantula, 12. firefly.

This is really quite an impressive list of animals from at least 4 different ecoregions. A lot of it must have depended on what captive animals were available for the production.

And that is just for the animals. Botanists can surely come up with a list of the motley assemblage of plants as well.

Update: Inkfish also noticed and wrote about the video.

Friday, February 8, 2013

Singpore Biodiversity Zodiac - Year of the Snake

The Lunar New Year for the year of the snake is approaching, and many people are reading the traditional zodiac predictions on how their fortunes would turn and what lucky colours to wear.

That and recent proposed land use plan of Singapore inspired this zodiac featuring animals in Singapore to highlight what challenges some of them may face in the year of the snake and beyond. Some of these threats to their survival may be things that people may be able to change, perhaps, though feedback to authorities or personal change in attitudes and mindsets. 

Much thanks to friends who have given feedback on this. Happy Lunar New Year!

Singapore Biodiversity Zodiac. Click for larger version.

[Rat] - Oriental house rat (Rattus tanezumi)

This human commensal rodent can be found in scrubland, plantations and urban areas. It is nocturnal, omnivorous and is a good climber. As it sometimes enters human dwelling, it is persecuted as a pest. Read more.


[Bull] - Banded bullfrog (Kaloula pulchra)

An introduced frog that can be found living around built up areas. Males can be heard calling before and after rain, sounding like a bellow of cattle. Feeds on insects. Read more.


[Tiger] - Leopard cat (Prionailurus bengalensis)

Singapore's last remaining wild cat. Nocturnal, feeding mainly on rodents, birds and small animals. A small population can be found on the forest and scrubland on the offshore island of Pulau Tekong and in the Western Catchment. Threatened by habitat loss. National status: Critically endangered. Read more.


[Rabbit] - Orange-spotted rabbitfish (Siganus guttatus)

A marine reef fish which can be also be found near mangroves. Feeds on algae. It has a row of sharp, venomous spines on the dorsal fin. These spines occasionally gets the fish trapped in driftnets and crab traps. Read more.


[Dragon] - Black-bearded flying dragon (Draco melanopogon)

A slender forest-dwelling gliding lizard. A pair of skin flaps on the sides of its body allows it to glide from tree to tree. Males have black and orange throat flaps which are used for signaling.  Read more.


[Snake] - Equatorial spitting cobra (Naja sumatrana)

Highly venomous black snake named from its ability to spray venom when defending themselves. Feeds on small animals including rats, frogs and lizards. Occurs in forest, scrubland, mangroves and suburban areas. Read more.


[Horse] - Tiger tail seahorse (Hippocampus comes)

Tropical marine fish found in reefs and other benthic habitat. Males carry the eggs in a brood pouch on the chest. Threatened by collection for traditional medicine and habitat loss from land reclamation. National status: Vulnerable. Read more.


[Goat] - Lesser mousedeer (Tragulus kanchil)

One of the smallest hooved animals in the world. The genus Tragulus means "little goat", but it is neither a goat or a true deer. Feeds on fallen fruit and other vegetable matter found in the forest floor. In Singapore, restricted to Bukit Timah and Central Catchment Nature reserves. Threatened by habitat loss and poaching. National status: Critically endangered. Read more.


[Monkey] - Long-tailed macaque (Macaca fascicularis)

This is the most common wild primate in Singapore. Forages for plant and animals both in trees and on the ground in forests, mangroves and parkland. Human-wildlife conflict with this species often results from food association with human due to human provisioning of food. Macaques regarded as problem animals are often trapped and put down. Read more.


[Rooster] - Red junglefowl (Gallus gallus)

Wild ancestor of the domestic chicken identified by a white ear patch and grey legs. Roosts in trees at night. The genetic purity of wild populations are threatened interbreeding with domestic fowls that have yellow legs. Read more.


[Dog] - Domestic dog (Canis familiaris)

Thousands of dogs are abandoned by their owners every year in Singapore. Feral population are sometimes rounded up when complaints are received by the authorities. Some are put up for adoption, while many are eventually put down. Read more.


[Pig] - Wild pig (Sus scrofa)

Singapore's largest resident land mammal. Omnivorous and active both by day and night. Once thought to be nationally extinct, populations in the Central Catchment Nature reserve were thought to be too numerous and destructive, leading to some calling for a cull, while others calling for more studies to be done. Read more.

Tuesday, August 31, 2010

Split Identity: The Flower Crab is Now Four and Other Stories

Life has changed slightly now that I am a full-time graduate student. This allows me a little time during 'office hours' for some research blogging to resurrect this space.

Hot off the press today with lots of interesting new findings is the latest issue of the Raffles Bulletin of Zoology published by the Raffles Museum of Biodiversity Research. I'll highlight two that papers that are closest to my heart.

Male crabs formerly known as Portunus pelagicus. Photo J. Lai.

The first, A Revision of the Portunus pelagicus (Linnaeus, 1758) species complex (Crustacea: Brachyura: Portunidae), with the recognition of four species by Lai et al. found that the crab formerly known as the swimming (or more commonly known in markets as 'flower') crab, P. pelagicus actually has a split identity - it is made up of four similar-looking species.

A species complex is a group of closely related species where scientists are unable to clearly differentiate. Traditionally, taxonomist use a selection of form or appearance to identify and classify organisms. This however, becomes increasingly tricky with very similar looking specimens. Using newer techniques such as molecular phylogenetics to complement morphology, scientist are now able to analyse characters and differences at genetic level and thus shed more light on species within a complex.

Based on morphology and DNA characters, the authors split the original flower crab into 4 species: P. pelagicus from Southeast and East Asia to Northern Australia; P. armatus circum Australia; and P. reticulatus and P. segnis slightly separated in the Eastern and Western Indian Ocean respectively.

It is interesting is that the original P. pelagicus was first described by Carl Linnaeus, the father of modern day scientific classification, and what Linnaeus did not have at that time is the sophisticated DNA analysis technology and know-how that is available today. We have come a long way since then. Now, what would this finding hold in the commercial realm...

Banded leaf monkey carrying infant. Photo A. Ang.

The next paper by Ang et al. records the Reproduction and Infant Pelage Colouration of the Banded Leaf Monkey (Mammalia: Primates: Cercopithecidae) in Singapore.

Prior to the study, little was known about the ecology of the banded leaf monkey (Presbytis femoralis) in Singapore. There were also reports of orange-coloured infants by scientists and veteran naturalists which is not characteristic of the species.

The authors spent 843 hours in the field and confirmed from at least 6 births that infant monkeys are born white, with black markings on the back (dorsum). This is consistent with the same species in Johor, Malaysia.

I had the pleasure of following the first author during their field trips and found that these monkeys were indeed difficult to study and follow due to their shyness and the forebodingly thick, spiky vegetation and boggy terrain. Despite this, Andie has been doggedly following them for the past one and a half years to collect these important natural history information about our local monkeys.

In addition, she collected data on their diet, genetic information from their feces and population size. All of which would contribute to the conservation of the species which now looks more optimistic for one which was formerly said to be doomed to extinction here.

References:

  1. Lai, J. C. Y., P. K. L. Ng, P. J. F. Davie. 2010. A Revision of the Portunus pelagicus (Linnaeus, 1758) species complex (Crustacea: Brachyura: Portunidae), with the recognition of four species. Raffles Bulletin of Zoology 58(2): 199-237.
  2. Ang, A., M. R. B. Ismail, R. Meier. 2010. Reproduction and Infant Pelage Colouration of the Banded Leaf Monkey (Mammalia: Primates: Cercopithecidae) in Singapore. Raffles Bulletin of Zoology 58(2): 411-415.

Wednesday, April 7, 2010

Onch Slugfest

Onch slugs (family Onchidiidae) are a group of shell-less gastropod molluscs in the same class as the more familiar snails and slugs. However, they are mostly found in coastal habitats or in the inter-tidal area.

Like snails, onch slugs have a pair of simple eyes on stalks that are only good for detecting light. Most of them look like shell-less snails or a bumpy brownish lump - the word "onch" literally means lump. They are not the prettiest of organisms, but their humble appearance grants them excellent camouflage. It definitely follows the wise adage that if you do not want to be eaten, do not look like food!

One unique characteristic of onchs is that they breath air using a simple lung, unlike marine slugs such as nudibranchs that get oxygen via feathery gills. Hence, onchs are considered pulmonates (from the Latin word pulmonarius, meaning of the lung). In this aspect, onchs are more similar to land snails and slugs.

Since onchs need to breath air, they are usually found above the water level on rocks, tree trunks or even man-made surfaces and in the inter-tidal area during low tide where they feed on algae and organic detritus. They scrape bits of algae off the surface with a rough rasp-like mouthpart called a radula.

Coupling in onchs is a strange affair. These slugs are hermaphrodites bearing both male and female organs. When they get together, they jab each other with hard and sharp love darts in a courtship ritual prior to mating where sperm is exchanged.

A soft-bodied animal living out of water will often face 2 major problems that is dangerous to its health - drying out and predators. Onch slugs are extremely well suited to their habitats and combat desiccation and predators with both structural and behavioural adaptations.

A thick mucus is secreted, covering the skin of the animal to prevent desiccation. In addition, the mucus is also thought to be foul tasting, and any predator attempting to swallow an onch will get a mouthful of a yucky gooey lump. In some species, the mucus leaves a trail for the onch to follow back to their own home.

Some onch can also burrow into the substrate to avoid heat, strong currents and predators. This one below burrowed into the mud within seconds upon sensing danger. Couple excellent camouflage, multi-purpose mucus and a nifty burrowing behaviour, onchs have a lot going for them where survival is concerned.




Unfortunately, on the whole, these charming creatures remain a poorly studied group and little is known about the biology of onch slugs in Singapore. Hopefully, more work can be done in this area to demystify these amazing little slugs.

Further reading:

  1. McFaruume, I. D. 1980. Trail-following and trail-searching behavior in homing of the intertidal gastropod mollusc, Onchidium verruculatum. Marine and Freshwater Behaviour and Physiology 7(1): 95-108.
  2. Ng, P. K. L. and Sivasothi. N. 1991. Mangrove slugs (Onchidiidae)A Guide to the Mangroves of Singapore Volume 2. Singapore Science Centre.

Tuesday, February 9, 2010

Estuarine Crocodile: An Ambush Predator

Last month, Peiting of The Simplicities in Life wrote about an estuarine crocodile (Crocodylus porosus) stalking a common sandpiper (Actitis hypoleucos). Since the crocodile did not end up with the bird in its jaws, it led to some speculation that it could have been just on its way up to its favourite busking spot.


Today at the mangrove reserve, two estuarine crocodiles were present and a similar stalking event occurred. One of the subadult crocodiles glided stealthily from the west bank of Sungei Buloh Bersah and approached a common sandpiper on the opposite bank.



Here, it can be seen how having its eyes and nostrils positioned on top of the head allows the crocodile to see above the water and breathe while keeping the rest of its body hidden. Since the species is able to hold its breath comfortably for up to 5 minutes and if forced, stay submerged for more than an hour, it is likely that this exercise which happened within 5 minutes could have been solely to watch the sandpiper.


The reptile then swam past where the sandpiper stood and positioned itself where the bird was heading - in other words, was leading the bird. In an ambush set up, what the crocodile is doing is essentially predicting where its prey will be and positioning itself in the predicted path of its prey.


It seemed that the crocodile's prediction was right and the sandpiper passed right in front of the crocodile. A few moments passed. Both animals appeared to hesitate and that gave the sandpiper an opening to take off, landing on the fallen tree behind.

Despite the fact that no bird ended up in the jaws of this crocodile, this event strengthens the view that the previous record was probably not born out of coincidence and sheds some light on the hunting technique employed by one of our top mangrove predators. As for the crocodile, after the sandpiper's timely flight, it turned itself around to face the opposite end of the river bank.

Though a small bird like the sandpiper may seem like an insignificant meal for a reptile about 1.6 m long, for a "cold-blooded" animal which does not require to burn energy to maintain a constant body temperature, a small bird meal can probably go a long way.

Also, bird-eating is in agreement with studies done on the diet of the species where smaller crocodiles fed mainly on insects, crabs and shrimp then graduate to larger vertebrate prey such as fish, birds and mammals.





After all, it would be a waste for an animal to have evolved one of the strongest bites over the millions of years of its existence if it was hunting only shrimps, beetles and halfbeaks.


Further reading:
  1. Taylor, J. A. 1979. The foods and feeding habits of subadult Crocodylus porosus Schneider in Northern Australia. Australian Wildlife Research 6(3): 347-359.

Friday, January 15, 2010

Mangrove Plants 1: Getting to the root of things

Often, I get besieged by botanists (including closet botanists and ornithologists) due to my botanical inaptitude. So here I am atoning for my zoological bias and aversion to all things from kingdom Plantae.
To start off, the swampy mangrove is a good place to introduce and highlight how highly adapted plants can be since there are less than 30 true mangrove plant species in Singapore and many have developed unique adaptations for the habitat.

Here, conditions on the ground is mostly muddy and unstable with low oxygen and high salt content from the sea. This poses various challenges to plants - imagine living in salty quick sand!

Hence, from ground up, plants that have evolved roots for support and coping with low oxygen and salt immediately gain a competitive advantage over those that do not.

One such group is Rhizophora. If asked how does one increase stability? Rhizophora's answer would be to grow more legs.

Members in this group develop prop or stilt roots that branch and loop from the trunk and branches. The result is a network of charmingly grotesque gothic pillars at the bottom of the tree.

When exposed during low tide, these long roots also help with oxygen intake.

These roots also have an additional trick that blocks salt from seawater entering the roots in a process called ultrafiltration.


In Bruguiera and Ceriops, the trees send their roots out far and wide, and increases anchorage by having bent, kneed roots at intervals that resemble the legs of people doing sit-ups on the ground.

This curious structures not only adds stability by increasing surface area of attachment and binding more sediment, but the parts that stick out also helps obtain oxygen.

In Bruguiera, the roots are also said to be able to perform ultrafiltration to remove salt.


Avicennia and Sonneratia also spread their roots far and wide for stability, but have spike-like breathing roots in place of kneed roots.

In spy or adventure movies, characters sometimes hide underwater and breathe using straws or tubes poking out of the surface. Breathing roots, or pneumatophores, work in a similar way.

The roots of Sonneratia are capable of ultrafiltration, but not in Avicennia. The latter, has other tactics which will be discussed in a future post.

But what is most interesting is how unrelated (or only distantly related) groups have somehow acquired similar adaptations at root level for mangrove living. Rhizophora, Bruguiera and Sonneratia can exclude salt when taking in seawater (ultrafiltration), while Avicennia and Sonneratia solve oxygen shortage with spike-like breathing roots.

This phenomenon is what scientists term as convergent evolution. Another example would be how dolphins (order Cetacea) and manatees (order Sirenia) have separately evolved fluked tails for swimming. Oops, mentioned mammals in a plant post.

Further reading:
1. Ng, P. K. L. and Sivasothi. N. 1991. How plants cope in the mangroves. A Guide to the Mangroves of Singapore Volume 1. Singapore Science Centre.

Sunday, January 3, 2010

Life Saving 123: Marine Animal Defenses at Pulau Semakau

The rich habitat along the sea shore provides lots of feeding opportunities for animals. However, this comes at a price. Compared to animals on land or in the sea, inhabitants here are vulnerable to predators coming both from the sea and land. Consequently, many have evolved anti-predator defences so as not to end up at someone else's dinner table. Examples of these could be found during our exploratory walk at Pulau Semakau today.
The most basic anti-predator defence has got to be fleeing. If you can't catch me, you can't eat me. Those that do that exceedingly well all eluded my capture on camera. The focus today will thus be on those that could not get away fast enough.

If you cannot get away fast enough, then better hope that your enemies cannot see you.

The hairy crab (Pilumnus sp.) is covered with long hair that breaks up the crab's outline and binds sediments to help it blend with its surroundings. If that does not work, it will dash into the closest crevice for cover.

Taking camouflage one step further, cuttlefish and squids such as this big-finned reef squid (Sepioteuthis sp.) can change their colour to match their surroundings. Another trick they may use is to release a cloud of ink to confuse predators while they make their escape.

If you are as slow as a snail, more extreme tactics will have to be used. A turban snail (Turbo sp.) has a hard shell which it can retract fully into to protect its soft body.
On its foot is a trap-door-like operculum that seals up the
opening. The thick and tough operculum has a rounded surface and protects the snail from the prying pincers of crabs and other predators.

The shape and colour of the operculum resemble cat's eyes and is sometimes made into jewelry.

Sometimes, best defence is offense.

The flower crab (Portunus pelagicus) packs a nasty pinch from its sharp pincers. When threatened, the aggressive crab faces its aggressor head on, pincers ready. On top of that, it is heavily armoured with a shell packed with numerous spikes to discourage predators from swallowing it.

The hell's fire sea anemone (Actinodendron sp.) defends itself from any animal that dares to touch it with a painful sting. This comes from stinging cells tipped with venom and they look like little harpoons under the microscope.
If you are a small shrimp with minimal defensive powers, then it is best to find a powerful ally.

Apparently the stinging cells of sea anemones are so effective that the anemone shrimp (Periclimenes brevicarpalis) have found a way to take advantage of them by living among them for protection. But as if free protection is not enough, this species has been observed feeding on the tentacles of its host anemone!

Today's exploratory walk at Pulau Semakau also saw new records of 3 sea cucumber species for the island's shore. Even though they look helpless, sea cucumbers are able to protect themselves too. Some contain toxins or taste downright foul to predators, others try to confuse enemies by vomiting their guts and other organs out while some produce sticky threads to bind attackers in a gooey mess. Very neat.
From left: Ball sea cucumber (Phyllophorus sp.), Holothuria notabilis, and brown sandfish sea cucumber (Bohadschia vitiensis).

At the end of this trip, I still wonder how people squat over ankle-high water without getting their backsides wet. Must acquire this veritable skill.

Further reading:
  1. Bruce, A. J. and Svoboda, A. 1983. Observations upon some pontoniine shrimps from Aqaba, Jordan. Zoologische Verhandelingen 205: 3-44.