Population Density Estimates and Growth Rates of Eleutherodactylus coqui in Hawaii

  title={Population Density Estimates and Growth Rates of Eleutherodactylus coqui in Hawaii},
  author={Karen H. Beard and Robert Al‐Chokhachy and Nathania C. Tuttle and Eric M. O’Neill},
Abstract The Puerto Rican terrestrial frog (Eleutherodactylus coqui) has received considerable attention in Hawaii because of its rapid spread, loud mating calls, and its potential threat to native species. [] Key Method To address this lack of information, we used mark-recapture methods to estimate E. coqui survival and abundance, determine growth rates of adult male and female frogs, and relate densities to elevation, snout–vent length (SVL), habitat structure, and invertebrate abundance. Mean adult E…

Population Ecology of the Riparian Frog Eleutherodactylus cuneatus in Cuba

A population of the poorly known riparian frog Eleutherodactylus cuneatus was studied for 1 yr along a mountain stream in eastern Cuba. We examined population structure, seasonal and daily activity,

Body Size and Life History Traits in Native and Introduced Populations of Coqui Frogs

Variation in growth rate paralleled that for adult body size and, if heritable, provides a possible mechanism for the observed differences inadult body size across elevations between Puerto Rico and Hawaii.

Diet, Density, and Distribution of the Introduced Greenhouse Frog, Eleutherodactylus planirostris , on the Island of Hawaii

  • C. Olson
  • Biology, Environmental Science
  • 2011
Invertebrate orders containing endemic species most threatened by the invasion include Acari (mites), Araneae (spiders), Collembola (springtails), and Psocoptera (booklice), which each comprised greater than 2% of their diet.

Biology and Impacts of Pacific Island Invasive Species. 5. Eleutherodactylus coqui, the Coqui Frog (Anura: Leptodactylidae)1

The Coqui has been hypothesized to potentially compete with native insectivores, the most obvious potential ecological impact of the invasion is predation on invertebrate populations and disruption of associated ecosystem processes.

Invasive coqui frogs are associated with greater abundances of nonnative birds in Hawaii, USA

Coquis do not appear to be important competitors with native birds in Hawaii, but the frogs are associated with increased abundances of some nonnative birds, which could induce undesirable ecosystem impacts.

Coqui frog invasions change invertebrate communities in Hawaii

It is suggested that coquis changed leaf-litter communities primarily through direct predation, but that they increased Diptera through the addition of frog carcasses and excrement, adding to the understanding of the invasion by showing that Coqui effects on invertebrate communities are measurable at the landscape scale.

Strong founder effects and low genetic diversity in introduced populations of Coqui frogs

Results suggest extensive mixing among frog populations across Hawaii, and that their spread has been facilitated by humans, and Coquis are successful invaders in Hawaii despite the loss of genetic variation.

Detection probabilities of two introduced frogs in Hawaii: implications for assessing non-native species distributions

Results suggest multiple visits to sites are required to detect the greenhouse frog and that accounting for detectability is essential when determining the extent of invasion of cryptic species.

Clinal Variation in Calls of Native and Introduced Populations of Eleutherodactylus coqui

In the laboratory, it was found the negative relationship between elevation and call frequency was best explained by larger body sizes at higher elevations, and that the positive and negative relationships between Elevation and call duration, and elevation andcall rate, respectively, were best explaining by lower temperatures at higher Elevations.



Population Densities of the Coquí, Eleutherodactylus coqui (Anura: Leptodactylidae) in Newly Invaded Hawaii and in Native Puerto Rico

It is suggested that the apparent lack of native or exotic predators in Hawaii and abundance of suitable retreat sites contribute to achievement of unusually high population densities of E. coqui in Hawaii compared with Puerto Rico.

Diet of the Invasive Frog, Eleutherodactylus Coqui, in Hawaii

  • K. Beard
  • Environmental Science, Biology
  • 2007
Dominant prey items in frog stomachs differed among study sites suggesting that frogs are opportunistic feeders and forage on abundant prey items, and management should focus on areas with endemic invertebrates of concern because these locations where E. coqui may have the greatest impact.


Population estimates from 1987 to 1995 are reported for the terrestrial anuran, Eleutherodactylus coqui, from four long-term study plots in the Luquillo Experimental Forest of northeastern Puerto

Population Dynamics of Eleutherodactylus coqui in Cordillera Forest Reserves of Puerto Rico

Adult body size increased from wet to dry season as population density declined and was found to differ significantly between forests, and average body size for Maricao and Guilarte populations were smaller than those reported for populations in eastern Puerto Rico.


Analysis of weather data indicates a significant warming trend and an association between years with extended periods of drought and the decline of amphibians in Puerto Rico, suggesting a possible synergistic interaction between drought andthe pathological effect of the chytrid fungus on amphibian populations.

Potential consequences of the coqui frog invasion in Hawaii

The Puerto Rican frog, Eleutherodactylus coqui, has invaded Hawaii and has negatively impacted the state's multimillion dollar floriculture, nursery and tourist industries; however, little is known

Eleutherodactylus frog introductions to Hawaii

The recent establishment in Hawaii of three new species of frogs native to the Caribbean: Eleutherodactylus coqui, E. martinicensis, and E. planirostris represent the first reports of establishment of the genus outside the general Caribbean region.

An invasive frog, Eleutherodactylus coqui, increases new leaf production and leaf litter decomposition rates through nutrient cycling in Hawaii

E. coqui in Hawaii has the potential to reduce endemic invertebrates and increase nutrient cycling rates, which may confer a competitive advantage to invasive plants in an ecosystem where native species have evolved in nutrient-poor conditions.


It is suggested that size dimorphism in this species is maintained by energetic constraints, resulting from male reproductive behavior, that reduce growth.