Quantitative evidence for global amphibian population declines

  title={Quantitative evidence for global amphibian population declines},
  author={J. E. Houlahan and C. Scott Findlay and Benedikt Rudolf Schmidt and Andrea H. Meyer and Sergius L. Kuzmin},
Although there is growing concern that amphibian populations are declining globally, much of the supporting evidence is either anecdotal or derived from short-term studies at small geographical scales. This raises questions not only about the difficulty of detecting temporal trends in populations which are notoriously variable, but also about the validity of inferring global trends from local or regional studies. Here we use data from 936 populations to assess large-scale temporal and spatial… 

Quantitative evidence for the effects of multiple drivers on continental-scale amphibian declines

It is found that local amphibian populations are being lost from metapopulations at an average rate of 3.79% per year, and that exposure to threats varies spatially, and populations vary in their response - providing little generality in the development of conservation strategies.

Ecology: Global amphibian population declines

Evidence of a mean global decline in monitored populations only in the 1990s is found, and the global mean not only masks substantial spatial and temporal variation in population trends and sampling effort, but also fails to distinguish between a global decline with global causes and the cumulative effects of local declines with local causes.

Population Declines and Priorities for Amphibian Conservation in Latin America

Abstract: Although dramatic amphibian population declines have been reported worldwide, our understanding of the extent of the declines in Latin America, where amphibian diversity is high, is limited

Amphibian Declines Are Not Uniquely High amongst the Vertebrates: Trend Determination and the British Perspective

Comparison evidence for British amphibians and reptiles concerning historical abundance, population trends and their causes are summarized, and how they relate to the situation elsewhere in Europe (and possibly the World).

The amphibian decline crisis: A watershed for conservation biology?

Amphibian Populations in the Terrestrial Environment: Is There Evidence of Declines of Terrestrial Forest Amphibians in Northwestern California?

Overall, there is no compelling evidence of a downward trend in terrestrial plethodontid salamanders in northwestern California forests, but continued monitoring of terrestrial salamander populations is important to understanding mechanisms of population declines in amphibian species.

Linking global warming to amphibian declines through its effects on female body condition and survivorship

Climate warming can act on wild temperate zone amphibians by deleteriously affecting their physiology, during and after hibernation, causing increased female mortality rates and decreased fecundity in survivors.

Long-Term Trends toward Earlier Breeding of Japanese Amphibians

This investigation demonstrated that climate warming has affected the timing of breeding in at least some species or populations of amphibians in East Asia.

Global amphibian declines: sorting the hypotheses

More studies are needed to connect the suspected mechanisms underlying both classes of hypotheses with quantitative changes in amphibian population sizes and species numbers, and to identify the hypotheses and conditions under which the various causes operate alone or together.

A Synthesis of Evidence of Drivers of Amphibian Declines

Abstract Early calls for robust long-term time series of amphibian population data, stemming from discussion following the first World Congress of Herpetology, are now being realized after 25 yr of



Declining Amphibian Populations

  • D. Wake
  • Environmental Science
  • 1991
The new data, the most extensive available, raise the possibility that declines are the coincidental effect of population fluctuations, and whether populations decline to local extinction in this area, chances of recovery are high.

Tests of Null Models for Amphibian Declines on a Tropical Mountain

Many of the recent, widespread declines and disappearances of amphibian populations have taken place in seemingly undisturbed, montane habitats. The question of whether the observed patterns differ

Collapse of a Regional Frog Fauna in the Yosemite Area of the California Sierra Nevada, USA

There has been much concern about widespread declines among amphibians, but efforts to determine the extent and magnitude of these declines have been hampered by scarcity of comparative inventory

Declining Amphibian Populations: The Problem of Separating Human Impacts from Natural Fluctuations

Data from 1979 to 1990 for three salamander species and one frog species at a breeding pond in South Carolina showed fluctuations of substantial magnitude in both the size of breeding populations and in recruitment of juveniles, illustrating that to distinguish between natural population fluctuations and declines with anthropogenic causes may require long-term studies.


Human impacts obviously have reduced or eliminated many populations of am- phibians and other organisms. Recent reports, however, have suggested that declines and disap- pearances of amphibian

Regional Dynamics and the Status of Amphibians

This work assessed the status of 11 amphibian species in southwestern Ontario, Canada, by estimating species richness, changes in presence and absence, and incidence at 97 ponds from 1992 to 1994, and detected a significant reduction in amphibianspecies richness in one of three regions.

Analysis of three amphibian populations with quarter–century long time–series

Only one of the three studied populations showed a negative trend which was probably caused by the introduction of fish, and two populations appeared to be density regulated and Rainfall had no obvious effect on the population fluctuations.

Amphibian Declines: Judging Stability, Persistence, and Susceptibility of Populations to Local and Global Extinctions

It is suggested that many amphibian populations may be unable to recolonize areas after local extinction, due to the physiological constraints, relatively low mobility, and site fidelity of amphibians.

Spatial Scale and Determination of Species Status of the Green Frog

Although the importance of spatial scale in determining species status (abundance and distribution) is widely recognized, most ecological investigations have been conducted at local scales. Our goal

Epidemic Disease and the Catastrophic Decline of Australian Rain Forest Frogs

In the montane rain forests of eastern Australia at least 14 species of endemic, stream-dwelling frogs have disappeared or declined sharply (by more than 90%) during the past 15 years. We review