Non-volant mammals from the protected areas associated to hydroelectric projects on the eastern slope of the northern Cordillera Central, Colombia

Sánchez‐Giraldo, Camilo; Daza, Juan M.

doi:10.15560/13.2.2098

Cited by 4 publications

References 22 publications

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Ecoacoustics in the rain: understanding acoustic indices under the most common geophonic source in tropical rainforests

Sánchez‐Giraldo

Bedoya

Morán-Vásquez

et al. 2020

Remote Sens Ecol Conserv

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Rainfall is one of the most predominant geophonic sources in nature, and the major climatic phenomenon influencing species biology in tropical ecosystems. Although its effects on acoustic indices have been studied, rainfall is recognized as a nuisance factor affecting their estimation. Consequently, files with rainfall sounds are typically removed from ecoacoustic analyses. In tropical rainforests, where rainfall is a common and unpredictable event, its influence on acoustic indices needs to be explicitly examined before implementing acoustic passive monitoring. Using mixed‐effects models we assessed the effect of different rainfall conditions on the direction and magnitude of the values of eight commonly used acoustic indices. We obtained 18336 1‐min recordings from 28 sampling sites in a montane forest on the northern Andes of Colombia between May‐July 2018. We identified 2867 1‐min recordings containing light to heavy rainfall. We found that both rainfall occurrence and its variation in intensity were associated with increases in ACI, ADI, H, and M index values, and decreases in AEI, BI, NDSI, and NP values. The estimated indices exhibited differential sensitivity to rainfall, with M, NDSI, and NP showing higher differences associated with increasing frequency and intensity of rainfall. Regardless the direction of change in index values caused by rainfall, we found that the magnitude of variation depended on the index. For instance, ACI and BI indices showed low sensitivity and can be considered as reliable acoustic metrics, even during heavy intensity rainfall. In contrast, M, NDSI, and NP might lead to misleading inferences, if rainfall events are not considered during calculation. We stress the importance of careful interpretation of biological inferences based on these sensitive indices and encourage an explicit assessment of rainfall, particularly in short‐term acoustic surveys in highly pluvious regions where rainfall is a conspicuous component of the soundscape.

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Ecoacoustics in the rain: understanding acoustic indices under the most common geophonic source in tropical rainforests

Sánchez‐Giraldo

Bedoya

Morán-Vásquez

et al. 2020

Remote Sens Ecol Conserv

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Environmental sound as a mirror of landscape ecological integrity in monitoring programs

Sánchez‐Giraldo

Ayram

Daza

2021

Perspectives in Ecology and Conservation

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Species richness, geographical affinities, and activity patterns of mammals in premontane Andean forests of the Magdalena river basin of Colombia

Torres

Rojas

2020

Preprint

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The Magdalena river basin is home to more than half of Colombia’s human population, and consequently the basin also harbors their economic activities. These activities have generated high deforestation rates and negative pressures on natural resources. With such a scenario of forest loss it is imperative to assess the state of the biodiversity and its conservation. Here, during six years we assessed the mammalian species richness and abundance in premontane forests of Caldas department in the Magdalena river basin. We also presented additional information on the activity patterns and geographical affinities of this fauna. We recorded 100 species of mammals with the Chiroptera as the richest order, followed by Rodentia. Most of the species are common and are not under risk of extinction; however, it is important to highlight the presence of six endemic species, three vulnerable species and one endangered species (white-footed tamarin). The mammalian fauna of this region is similar to other lowland localities in the Neotropics, and less similar to highland localities, including the nearby ones. Specifically, this fauna is most similar to lowland Tolima, and the Caribbean region of Colombia, Venezuela and Costa Rica; however, when we accounted only for bat fauna, it was more similar to the Caribbean and Pacific regions of Colombia. To secure the long-term persistence of these species we recommend maintenance of the current corridors such as riparian forests and living fences and an increase in the forested area.

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Non-volant mammals from the protected areas associated to hydroelectric projects on the eastern slope of the northern Cordillera Central, Colombia

Cited by 4 publications

References 22 publications

Ecoacoustics in the rain: understanding acoustic indices under the most common geophonic source in tropical rainforests

Ecoacoustics in the rain: understanding acoustic indices under the most common geophonic source in tropical rainforests

Environmental sound as a mirror of landscape ecological integrity in monitoring programs

Species richness, geographical affinities, and activity patterns of mammals in premontane Andean forests of the Magdalena river basin of Colombia

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