The granular poison frog or granular poison arrow frog (''Oophaga granulifera'') is a species of

frog A frog is any member of a diverse and largely semiaquatic group of short-bodied, tailless amphibian vertebrates composing the order (biology), order Anura (coming from the Ancient Greek , literally 'without tail'). Frog species with rough ski ...

in the family

Dendrobatidae Poison dart frog (also known as dart-poison frog, poison frog or formerly known as poison arrow frog) is the common name of a group of frogs in the Family (biology), family Dendrobatidae which are native to tropical Central America, Central an ...

, found in

Costa Rica Costa Rica, officially the Republic of Costa Rica, is a country in Central America. It borders Nicaragua to the north, the Caribbean Sea to the northeast, Panama to the southeast, and the Pacific Ocean to the southwest, as well as Maritime bo ...

and

Panama Panama, officially the Republic of Panama, is a country in Latin America at the southern end of Central America, bordering South America. It is bordered by Costa Rica to the west, Colombia to the southeast, the Caribbean Sea to the north, and ...

. Originally described as ''Dendrobates granuliferus'', it was moved to ''Oophaga'' in 1994. Its natural

habitat In ecology, habitat refers to the array of resources, biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species' habitat can be seen as the physical manifestation of its ...

s are tropical humid lowland forests; it is threatened by

habitat loss Habitat destruction (also termed habitat loss or habitat reduction) occurs when a natural habitat is no longer able to support its native species. The organisms once living there have either moved elsewhere, or are dead, leading to a decrease ...

Description

The granular poison frog is a small frog with slender limbs growing to about . Its skin is finely granulated and its colour is typically bright orange head, body and upper arms and bluish-green underparts, legs and lower arms. In the vicinity of Quepos, Costa Rica, there is a colour morph in which the orange colour is replaced with olive green.

Distribution and habitat

The granular poison frog is native to Costa Rica and Panama. Its range extends from southwestern Costa Rica through the adjacent area of south-western Panama at heights of up to above sea level. It also occurs in Piedras Blancas National Park in south-eastern Costa Rica. It inhabits the

leaf litter Plant litter (also leaf litter, tree litter, soil litter, litterfall, or duff) is dead plant material (such as leaves, bark, needles, twigs, and cladodes) that has fallen to the ground. This detritus or dead organic material and its constituen ...

of the floor of humid low altitude forests.

Behaviour

The granular poison frog is a diurnal terrestrial species. Breeding takes place in the rainy season and the female lays groups of three or four eggs in curled up dead leaves, under stones, in twig forks and in leaf axils just above the ground. The male guards the eggs and keeps them moist with his urine. When they hatch, the female carries the

tadpole A tadpole or polliwog (also spelled pollywog) is the Larva, larval stage in the biological life cycle of an amphibian. Most tadpoles are fully Aquatic animal, aquatic, though some species of amphibians have tadpoles that are terrestrial animal, ...

s singly to temporary water bodies such as hollows in trees, leaf axils of species such as ''

Dieffenbachia ''Dieffenbachia'' , commonly known as dumb cane or leopard lily, is a genus of tropical flowering plants in the family (biology), family Araceae. It is native to the New World Tropics from Mexico and the West Indies south to Argentina. Some spec ...

'' and to

bromeliad The Bromeliaceae (the bromeliads) are a Family (biology), family of monocot flowering plants of about 80 genera and 3700 known species, native mainly to the Tropics, tropical Americas, with several species found in the American subtropics and on ...

s, at heights of a metre or two off the ground. The volume of water in these cavities averages . The female feeds the tadpoles on an ongoing basis by laying unfertilised eggs in the water bodies. The frog is an

aposematic Aposematism is the Advertising in biology, advertising by an animal, whether terrestrial or marine, to potential predation, predators that it is not worth attacking or eating. This unprofitability may consist of any defenses which make the pr ...

animal, and it uses

poison A poison is any chemical substance that is harmful or lethal to living organisms. The term is used in a wide range of scientific fields and industries, where it is often specifically defined. It may also be applied colloquially or figurati ...

only for self-defense from predators. Its bright colors are used as a warning signal to all possible predators. Experimental studies in Costa Rica suggest the male granular poison frog spends the majority of its time and energy defending its calling site. These warning signals are more vocal (acoustic) than visual. If an encroaching male dared to approach too closely, a fight could ensue.Amphibian rescue
Information about the granular poison frog

Status

The

IUCN The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the status ...

has listed this species as being " Vulnerable" because its range is relatively small, its numbers seem to be declining and it is threatened by destruction of its rainforest habitat. Threats to this species include habitat loss from agriculture for

palm oil Palm oil is an edible vegetable oil derived from the mesocarp (reddish pulp) of the fruit of oil palms. The oil is used in food manufacturing, in beauty products, and as biofuel. Palm oil accounted for about 36% of global oils produced from o ...

, bananas, and pineapples and associated pesticides. Capture for sale in the international pet trade may also cause local declines. This frog's range includes some protected parks: Reserva Forestal Golfo Dulce, Refugio de Vida Silvestre Golfito, and Refugio de Vida Silvestre Boracayán.

References

External links

* * {{Taxonbar, from=Q138758 Oophaga Frogs of North America Aposematic species Amphibians of Costa Rica Amphibians of Panama Amphibians described in 1958 Taxa named by Edward Harrison Taylor Taxonomy articles created by Polbot