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Colostethus Beebei. Charismatic Jewel Of Photos by Philippe J. R. Kok REPTILIA 47 According to DALY et al. (1994b), the species of the genus Colostethus are unable to take up lipophilic alkaloids. Nonetheless, one species, Colostethus inguinalis (Cope, 1868), from Colombia, is known to be toxic (DALY et al., 1994a). Rocket frogs are found from cen- tral Costa Rica to northern Peru and the Guianas (Guyana, Suriname, and French Guiana), and through the Amazon Basin to southeastern Brazil, as well as on the Caribbean island of Martinique (FROST, 2004). Colostethus species can be found at different elevations ranging from sea level to about 4,000 meters. Most rocket frogs are primarily diurnal, ground-dwelling inhabitants of the leaf litter in tropical forests. The genus Colostethus shows great interspecific variability in repro- ductive behavior. Tadpoles of some species are exotrophic (feeding on materials not derived from a parent); tadpoles of other species are endotrophic (deriving their develop- mental energy and nutrition from vitellogenic yolk or other parent- At least three golden rocket frogs inhabit this giant terrestrial bromeliad produced material) (ALTIG and JOHNSTON, 1989). to find. COLOMA (1995) presented (FRANK and RAMUS, 1995). The Guyana. NOBLE (1923) distin- Similarity in coloration, pattern, disturbing evidence of declines in male reaches 16.6 millimeters in guished the new species from other and morphology between different Ecuadorian populations of some length; the female 19 millimeters Colostethus species by its small size, species of Colostethus, combined Colostethus species. Habitat destruc- (BOURNE et al., 2001). The species brilliant coloration (extremely unusu- with conspecific color-pattern poly- tion and global warming are probably was first described from a single al for the genus), and short but well- morphism (variation within single the main causes of decline, but a com- female specimen collected in 1921 by defined webbing between the toes. species), has led to some taxonomic plex of factors including, diseases, William Beebe near Kaieteur Falls, BOURNE (2001) recognized five confusion, especially within the increased UV radiation, environmen- different color-pattern morphs, three species of the Guianas. For example, tal acidification, and agrochemicals of which are brilliantly colored. In Colostethus beebei (Noble, 1923), are also implicated (POUGH et al., June 2004, during the first phase of which does not occur in French 2004). The paucity of data on the sta- our sampling of the Kaieteur herpeto- Guiana, has been erroneously tus of populations is clearly a major logical richness, we collected two reported from there on several occa- limitation on our ability to monitor clearly distinct morphs: one bright A small Brocchinia micrantha, exclusive biotope of the golden rocket frog, with Kaieteur Falls in the background sions (LESCURE, 1976; LESCURE declines. Reliable data showing yellow (the most commonly seen), and MARTY, 2000; HOOGMOED trends in population numbers is need- and one brown. We observed the The genus Colostethus In fact, no fewer that 25 species and AVILA-PIRES, 1991; BOISTEL ed for accurately determining threat types of discrete variation within the Cope, 1866, a Neotropical have been described just since the and DE MASSARY, 1999; KOK, status. Colostethus populations seem yellow morph and brown morph as dendrobatid frog, encom- beginning of the 21st century, most- 2000; FROST, 2004). Colostethus to remain stable in protected areas, detailed by BOURNE (2001). passes more than 120 ly from Colombia, Brazil, and Peru. brunneus (Cope, 1887) has been but this must be confirmed by extant species (FROST, Colostethus species diversity appears reported from the Guianas, but field censuses. In any case, endemic Distribution and habitat 2004), commonly known as the rock- to be greatest in northwestern South the frogs seen probably belong to species with very restricted geograph- As far as we know, Colostethus et frogs (FRANK and RAMUS, America, decreasing to the east, one or more undescribed species ical ranges should always be consid- beebei is endemic to Guyana, and 1995) because of their explosive southeast, and north (into Central (MORALES, 2002). ered at risk (POUGH et al., 2004). occurs only in Kaieteur National jumping ability. Many new species America). Many Colostethus species have Park. Guyana is known as “Land of of Colostethus have been described Rocket frogs are usually small with suffered severe local population Description Many Waters” because of its numer- in the past few decades, and we cryptic coloration, lacking the toxins declines during the past 10 to 20 Colostethus beebei is a tiny, charis- ous rivers and streams. The country The most commonly seen bright-yellow morph assume that many others still await and aposematic coloration character- years, and some species that were matic frog commonly called the gold- was usually seen on live green leaves, but lies over part of the Guiana Shield discovery and scientific description. istic of most other dendrobatids. once very abundant are now difficult en rocket frog, or Beebe’s rocket frog sometimes also on dead brown leaves (or Guiana Highlands), one of the REPTILIA 48 REPTILIA 49 world’s oldest geological formations, renowned for its rich biodiversity. The higher, central parts of the Guiana Shield are covered with sandstone remnants of the Roraima formation (HOOGMOED, 1979), a breathtaking landscape marked by more or less flat-topped peaks called “tepuis.” Sir Arthur Conan Doyle’s The Lost World was inspired by this area. The Pakaraima Mountains of central-western Guyana are part of the Roraima sandstone formation. Kaieteur Park, one of the first national parks established in South America (in 1929 by the British Commonwealth) has recently been expanded to encompass an area of 62,680 hectares (154,882 acres) Mist rising from the falls forms a cloud-forest habitat occupied by specialized species along the rim of the gorge (KELLOFF, 2003). The centerpiece of the park is the impressive Kaieteur Falls situated where the Pakaraima Mountains give way to the coastal lowlands. With a volume of 600,000 liters per second going over an unin- terrupted single drop of 226 meters, Kaieteur is one of the most powerful waterfalls on Earth. This pounding Portrait of a bright orange-yellow morph of Colostethus beebei behemoth has carved a huge gorge, and expels millions of liters of water dead brown leaves, whereas the breeding in the water-filled leaf axils, amicable visits (social interactions as mist. In conjunction with prevail- bright yellow morph is more com- or tanks, of the bromeliads they without aggression) between neigh- ing winds, this mist appears to influ- monly seen on live green leaves. We inhabit — they do not gather at other bors. This is the first report of non- ence the densities of Colostethus made similar observations, occasion- aquatic sites for mating, as many oth- reproductive sociality for unrelated beebei (BOURNE et al., 2001). A ally finding a few of the bright yellow er anurans do. Social behavior in individuals in any frog species. cloud-forest environment formed by frogs on dead brown leaves, but very amphibians generally involves inter- BOURNE (unpublished data) rising mist along the crest of the rarely finding brown frogs on live actions only in conjunction with mat- induced group-living and changes of gorge also harbors endemic flora green leaves. ing, but our observations and earlier residence in captive Colostethus bee- Aerial view of Brocchinia micrantha glades on the Kaieteur Tepui, where golden rocket frogs still abound (KELLOFF, 2003). The Kaieteur plateau supports experiments by BOURNE (unpub- bei by manipulating the temporal and Colostethus beebei is the only unique and interesting habitat types. lished data) indicate that golden rock- spatial distribution of water — find- species of its genus known to be a Brocchinia spp. dominated savannas, et frogs also interact with their con- ings supported the hypothesis that bromeliad specialist — it lives and for example, harbor another endem- specific neighbors on an everyday sociality allows individuals to monitor breeds exclusively on the giant ic frog, Tepuihyla talbergae, recent- basis. On the premise that group-liv- spatial and temporal distribution of terrestrial bromeliad Brocchinia ly described by DUELLMAN and ing naturally accrues costs but not water, thereby minimizing mortality micrantha (BOURNE et al., 2001). YOSHPA (1996). During the day- necessarily benefits to individuals, we by desiccation. We speculate that the These giant bromeliads grow in time Tepuihyla talbergae often takes investigated why golden rocket frogs daily visits between neighbors humus caught in rock crevices, and refuge in the much smaller, insectivo- should remain together beyond the increases recognition of individuals can reach 3.5 meters in height rous terrestrial bromeliad Brocchinia time required for reproduction. and thereby reduces energy expend- (KELLOFF, 2003). Golden rocket reducta, but can sometimes also be The number of golden rocket frogs ed competing for access to pools. frogs are found in open glades where found in the giant bromeliads with living on a single bromeliad was pre- Colostethus beebei courtship (as in the giant bromeliads are abundant. Colostethus beebei. dicted to depend on the volume of other dendrobatids) is long and elab- The frog population densities are water, amount of dissolved oxygen, orate, including close-range vocal, highest in close proximity to Kaieteur Ecology and behavior
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