Dendrobates leucomelas helps keep its prey populations in balance, and consumes many insects that humans would consider pests. Along with other poison dart frogs in the family Dendrobatidae, this frog is used in medical research because its complex skin toxins are a possible source of medicines for human diseases. Also, certain Dendrobatid frogs were of importance to the Colombian Choco Indians who used the poisons from the frog's skin to tip their hunting darts.
Some amphibian hobbyists keep and breed these and other poison dart frogs, which may have an economic benefit if such trade can be shown to be sustainable and does not reduce natural frog populations.
Positive Impacts: pet trade ; source of medicine or drug ; research and education; controls pest population
These animals, along with all other animals, play an important role in maintaining the balance of nature. They are predators of ants, termites, tiny beetles, crickets, and other small insects and spiders. They are prey to snakes.
Largely insectivorous, the diet of these frogs consists of ants, termites, tiny beetles, crickets, and other small insects and spiders. They spend most of their time in the wild foraging for food, presumably because their prey are so small. In captivity, they are fed crickets and fruit flies (often, "pinhead" crickets and wingless fruit flies). When raised in captivity, D. leucomelas lose their skin toxins, which indicates that they may synthesize the toxins from some component of their diet. One major source of food in the wild that may provide chemicals to synthesize the toxins are formacine ants.
Young are sometimes canabalistic, although this behavior is apparently limited to times when unwary adults place new tadpoles into an already occupied pool. Although some Dendrobates species feed their young with unfertilized eggs, this behavior has not been observed in D. leucomelas.
Animal Foods: amphibians; insects; terrestrial non-insect arthropods
Primary Diet: carnivore (Insectivore )
Yellow banded poison dart frogs, Dendrobates leucomelas, are found in the Neotropical region, in northern South America. The range includes Venezuela, northern Brazil, Guyana and southeastern Colombia.
Biogeographic Regions: neotropical (Native )
Yellow-banded poison dart frogs prefer humid or wet habitats and can be found on forest soil in moist stones, wet tree trunks, and roots of rainforest trees. Tadpoles can be found in epiphyllic plants such as bromeliads. They are found in lowland regions with average temperatures of 26 to 30 degrees celsius or above. These frogs have been reported at elevations of 50 to 800 m above sea level.
Range elevation: 50 to 800 m.
Habitat Regions: tropical ; terrestrial
Terrestrial Biomes: rainforest
The longest living Dendrobates in captivity survived for 20.5 years. However, the expected lifespan of a poison dart frog in captivity is 10 to 15 years. In the wild, individuals probably live from 5 to 7 years.
Range lifespan
Status: captivity: 20.5 (high) years.
Typical lifespan
Status: wild: 5 to 7 years.
Typical lifespan
Status: captivity: 10 to 15 years.
Dendrotes leucomelas is one of the largest species in the genus Dendrobates, with an adult body (snout to vent) length ranging from 3.1 to 5 cm, although individuals are only rarely more than 4 cm. Average weights of 3 g are reported.
This species is defined by its distinctive yellow and black bands across the body. As an individual frog ages, the black bands often break off into spots. This bright coloration undoubtedly represents aposematic coloration, which is defined as having conspicuously bright colors that are used as a warning of danger or distastefulness to potential predators. These frogs are known to produce toxic chemicals in their skin, making htem poisonous to most would-be predators. Females of this species are often larger and more robust than the males.
Average mass: 3 g.
Range length: 31 to 50 mm.
Average length: 40 mm.
Other Physical Features: ectothermic ; bilateral symmetry ; poisonous
Sexual Dimorphism: female larger
Many potential predators are undoubtedly repelled by the toxic skin secretions of this frog, but some snakes may be able to eat them. The tadpoles are also prey to damselfly nymphs.
Known Predators:
Anti-predator Adaptations: aposematic
These frogs have no adverse economic impact to humans. The skin toxins of this frog are very intense, and are are capable of killing, injuring, or impairing humans if the frogs are carelessly handled; however they are of no danger to people who leave the frogs alone.
Negative Impacts: injures humans (poisonous )
Male poison dart frogs find the best site for the female to deposit a few large eggs, usually on the underside of a leaf that is near water. The eggs are then fertilized, protected and maintained by the male. It is the male's duty to keep the eggs moist so they can grow. There are conflicting reports of the paternal care of these frogs, with some accounts indicating that the male of this species transports the fertilized eggs in his mouth to water (Honolulu Zoo, 2003) and others indicating that the male transports tadpoles to water after the eggs have hatched (Lehmann, 2003). The reason for this discrepency is not apparent, although it may be reasonably concluded that transport of the young is accomplished by their father. Eggs hatch into tadpoles about 10 to 14 days after fertilization.
After 70 to 90 days, the tadpoles have fully metamorphed into froglets. They are mature between 12 and 18 months.
Development - Life Cycle: metamorphosis
These frogs are not thought to be an especial conservation concern. They are listed on CITES appendix II, probably because of exploitation and destruction of their habitat for lumber.
US Federal List: no special status
CITES: appendix ii
IUCN Red List of Threatened Species: least concern
Males use vocalizations such as chirps, buzzes, trills and hums to attract females. Direct behavioral actions facilitate courtship and stimulate oviposition. Call sound like pleasant "birdlike" trills, lasting for 10 to 15 seconds.
In addition to vocalizations, males use visual cues as well to show off their brightly colored bodies. Tactile communication is important in breeding, as females and males touch one another in courtship.
Tadpoles use vibrations through water to signal their presence in a water pool to adult frogs. Should a male deposit a second tadpole into a pool, the first tadpole is likely to eat it.
These frogs depend upon vision to locate prey. In general frogs are not known to have a strong sense of smell, so it is unlikely that they use chemical communication.
Communication Channels: visual ; tactile ; acoustic
Other Communication Modes: vibrations
Perception Channels: visual ; tactile ; acoustic ; vibrations
During mating season, males use vocalizations described as chirps, buzzes, trills, and hums to get the attemtion of females. They also show off their brightly colored bodies. Calling is most intense for an hour or two after sunrise and before sunset.
After a female chooses a male, she follows him to his chosen breeding ground and strokes his back and snout. Sometimes both the male and female slowly circle one another and stamp their feet. Females compete for males.
The male frog leads the female to an appropriate spot to deposit her eggs. The eggs are usually laid on leaves, in areas of high humidity. Then the male frog tends to the eggs and newly hatched tadpoles.
In some species in the genus Dendrobates, newly hatched tadpoles cling the male's back. Sitting upon their father, the tadpoles ride through the forest understory. The male climbs high up into the forest canopy, where he deposits the tadpoles into one of a variety of water-holding plants, particularly bromeliads. Although most sources indicate that this is also true for D. leucomelas, at least one indicates that the male transports the eggs to a water source prior to hatching (Honolulu Zoo, 2003).
Bromeliads are ideal for tadpole growth because they have numerous cup-like leaves filled with water. One tadpole is placed in each pocket of water. The parent distributes the tadpoles among many plants, presumably so that predators will not be able to locate all of the tadpoles. The primary predators on the tadpoles are giant damselfly nymphs, which have hatched from eggs also laid in the bromelid plants.
Another danger for the tadpoles is other dart frogs, including conspecifics. If an adult frog approaches a plant that is already occupied, the tadpole will produce a warning signal by aiming its head at the center of the plant, holding itself rigid, and rapidly vibrating its tail. If an tadpole-carrying parent ignores this signal and accidentally deposits another tadpole in the same bromelid sanctuary, the original tadpole will eat it.
Mating System: polygynandrous (promiscuous)
Breeding occurs during a limited season each year, from February to March. Female D. leucomelas lay multiple clutches of 2 to 12 eggs, and may lay as many as 1000 eggs during the breeding season.
Eggs are fertilized externally, then cared for by the male of the species. Young metamorphose by 70 to 90 days of age. The young froglets are sexually mature by two years of age.
Breeding interval: Once yearly during the rainy season
Breeding season: Breeding is reported to occur between February and March.
Range number of offspring: 100 to 1000.
Range time to hatching: 10 to 14 days.
Range time to independence: 70 to 90 days.
Average age at sexual or reproductive maturity (female): 2 years.
Average age at sexual or reproductive maturity (male): 2 years.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization (External ); oviparous
The degree and pattern of parental care varies between species of poison dart frogs. In D. leucomelas, the male does all of the parenting. The male tends to the eggs and the hatched tadpoles, and transfers them to the water-filled cavities high in the forest canopy. The female provides the eggs with nutrients to support the tadpole before it hatches, but the male continues to wet and protect the young until they are independent.
Parental Investment: pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Male, Protecting: Male); pre-weaning/fledging (Protecting: Male)
The yellow-banded poison dart frog (Dendrobates leucomelas), also known as yellow-headed poison dart frog or bumblebee poison frog, is a poison dart frog from the genus Dendrobates of the family Dendrobatidae.
Dendrobates leucomelas is a common poison dart frog found in the northern part of continent of South America, most notably in Venezuela. It is also found in parts of Guyana, Brazil, and the extreme easternmost part of Colombia.[3] This amphibian is normally found in very humid conditions in tropical rain forests, close to fresh water. It is often found on flat rocks, trees, plants (notably bromeliads), and the leaf litter of the forest floor. During the dry season, specimens are known to congregate in damper places, such as under rocks or fallen tree trunks.[1]
The D. leucomelas' natural habitat is tropical, and not subject to great seasonal temperature variations. Typically, temperature variances are related to elevation and time of day, and range from the low 20s to the low 30s °C. In captivity, care must be taken not to overheat the frogs, as they can be sensitive to higher temperatures.
Although preferring high humidity levels, this species can handle lower humidity levels much better than other species in the genus. Specimens can also be found in the seasonally drier forest islands in its natural range, and at elevations ranging from sea level to 800 metres AMSL.[4]
Dendrobates leucomelas is one of the largest species in the genus Dendrobates, with a snout-to-vent length between 3.1 and 5 cm (1.2 and 2.0 in). Average adult size, however, rarely exceeds 4 cm (1.6 in).[3] Their average weight is reported as being around 3 g (0.11 oz). Females tend to be slightly larger than the males, but otherwise, little in their appearance can be used to determine the sex of the species.
Like most poison dart frogs, the yellow-banded poison dart frog has evolved aposematic colouration as a warning to potential predators that it will make an unpalatable or toxic meal.
Predominantly, these frogs have a bright yellow colouration with varying numbers of broad black stripes and/or spots that extend over the whole body. Some morphs are orange in colour, and variations exist within the species (naturally occurring and not morphs solely within the exotic pet community) that dictate the extent of these markings ranging from fine spots to thick, unbroken banding.[5]
They have glandular, adhesive pads on their toes (which aid in climbing and positioning) and, in common with other species in their order, they have a short, protrudable, unnotched, sticky tongue, which extends to catch prey.[6]
Dendrobates leucomelas frogs are diurnal by nature, and are known to be fiercely territorial. They live in small groups in the Uniquely, it is also the only poison dart frog to estivate during dry spells.[3]
Like all Dendrobatidae, D. leucomelas frogs secrete toxins from their skin, which they gain from eating certain unspecified arthropod prey. It is uncertain precisely which arthropods lend their toxicity to which genus of Dendrobatidae, but one such arthropod is thought to have been identified as a possible source of the toxin for Dendrobatidae Phyllobates terribilis (aka the golden poison frog), and it is a local variant of the Melyrid beetle.[7]
Dendrobatidae toxins vary from species to species, but some are extremely potent neurotoxins. The alkaloid toxins, secreted from the frogs' skin, interfere with nerve impulses, which can lead to heart failure or fibrillation.
The species' robustness, relatively common numbers in the wild, and widespread natural distribution has helped maintain this frog's status of "Least Concern" on the International Union for Conservation of Nature's conservation red list, despite some overharvesting of wild specimens for the exotic pet trade.[3][1] The species' ability to be easily bred in captivity has led to a fall in prices within the free market, which is an alleviative factor to the problem of overharvesting.
The yellow-banded poison dart frog (Dendrobates leucomelas), also known as yellow-headed poison dart frog or bumblebee poison frog, is a poison dart frog from the genus Dendrobates of the family Dendrobatidae.
