Evaluation of a Long-Term Amphibian Monitoring Protocol in Central America

Kaiser, Kristine

doi:10.1670/06-269r1.1

Cited by 5 publications

(2 citation statements)

References 24 publications

(21 reference statements)

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“…However, many studies of metapopulation dynamics that seek to understand for the factors that determine whether a species will exist at a location [7][8][9]. Large-scale monitoring programs for amphibian species [10][11][12] often relied on remotely sensed data (data on amphibians that has been gathered using biophysical variables derived from moderate resolution imaging spectroradiometers or from remote-sensing instruments on satellites) to depict spatial models in habitat occupancy [13][14][15]. Ignoring detectability may lead to biased estimations of site occupancy [16][17][18] and studies of habitat occupancy are often hampered by imperfect detectability for the species [1,[19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Ecology of the Granular Spiny FrogQuasipaa verrucospinosa(Amphibia: Anura - Dicroglossidae) in Central Vietnam

Ngo¹,

Lee²

2022

Protected Area Management - Recent Advances

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We conducted a large-scale assessment at 35 primary forest sites and 42 secondary forest sites in Bach Ma National Park, central Vietnam, using the detection/non-detection data for each site over multiple visits, to quantify the site proportions that were occupied by granular spiny frogs (Quasipaa verrucospinosa). We additionally investigated the effect of site covariates (primary versus secondary forests) and sample covariates (temperature, humidity, and precipitation) to examine the environmental needs that may be incorporated for conserving rain forest amphibians in Vietnam. From the best model among all candidate models, We estimated a site occupancy probability of 0.632 that was higher than the naïve occupancy estimate of 0.403 and a 57% increase over the proportion of sites at which frogs were actually observed. The primary forest variable was an important determinant of site occupancy, whereas occupancy was not associated with the variable of secondary forest. In a combined AIC model weight, the detection model p (temperature, humidity, precipitation) included 90.9% of the total weight, providing clear evidence that environmental conditions were important sample covariates in modeling detection probabilities of granular spiny frogs. Our results substantiate the importance of incorporating occupancy and detection probabilities into studies of habitat relationships and suggest that the primary forest factor associated with environmental conditions influence the occupancy of granular spiny frogs.

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Section: Introductionmentioning

confidence: 99%

Ecology of the Granular Spiny FrogQuasipaa verrucospinosa(Amphibia: Anura - Dicroglossidae) in Central Vietnam

Ngo¹,

Lee²

2022

Protected Area Management - Recent Advances

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“…The integration of bioacoustics into wildlife management has grown extraordinarily in recent decades and provides efficient tools for monitoring several taxa such as amphibians [ 1 ], birds [ 2 – 5 ], or mammals [ 6 – 10 ]. The response of animals to sound playbacks has been used, for instance, to estimate population sizes and trends [ 11 ], which are essential population parameters to design and evaluate management and conservation actions [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Decoding Group Vocalizations: The Acoustic Energy Distribution of Chorus Howls Is Useful to Determine Wolf Reproduction

et al. 2016

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Population monitoring is crucial for wildlife management and conservation. In the last few decades, wildlife researchers have increasingly applied bioacoustics tools to obtain information on several essential ecological parameters, such as distribution and abundance. One such application involves wolves (Canis lupus). These canids respond to simulated howls by emitting group vocalizations known as chorus howls. These responses to simulated howls reveal the presence of wolf litters during the breeding period and are therefore often used to determine the status of wolf populations. However, the acoustic structure of chorus howls is complex and discriminating the presence of pups in a chorus is sometimes difficult, even for experienced observers. In this study, we evaluate the usefulness of analyses of the acoustic energy distribution in chorus howls to identify the presence of pups in a chorus. We analysed 110 Iberian wolf chorus howls with known pack composition and found that the acoustic energy distribution is concentrated at higher frequencies when there are pups vocalizing. We built predictive models using acoustic energy distribution features to determine the presence of pups in a chorus, concluding that the acoustic energy distribution in chorus howls can be used to determine the presence of wolf pups in a pack. The method we outline here is objective, accurate, easily implemented, and independent of the observer's experience. These advantages are especially relevant in the case of broad scale surveys or when many observers are involved. Furthermore, the analysis of the acoustic energy distribution can be implemented for monitoring other social canids that emit chorus howls such as jackals or coyotes, provides an easy way to obtain information on ecological parameters such as reproductive success, and could be useful to study other group vocalizations.

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Vanishing herpetofauna: 30 years of species relaxation in a wetland remnant of the Po plain (Northern Italy)

2017

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Evaluation of a Long-Term Amphibian Monitoring Protocol in Central America

Cited by 5 publications

References 24 publications

Ecology of the Granular Spiny FrogQuasipaa verrucospinosa(Amphibia: Anura - Dicroglossidae) in Central Vietnam

Ecology of the Granular Spiny FrogQuasipaa verrucospinosa(Amphibia: Anura - Dicroglossidae) in Central Vietnam

Decoding Group Vocalizations: The Acoustic Energy Distribution of Chorus Howls Is Useful to Determine Wolf Reproduction

Vanishing herpetofauna: 30 years of species relaxation in a wetland remnant of the Po plain (Northern Italy)

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