Movement Patterns in a Uruguayan Population of<i>Melanophryniscus montevidensis</i>(Philippi, 1902) (Anura: Bufonidae) Using Photo-Identification for Individual Recognition

Pereira, Gisela; Maneyro, Raúl

doi:10.2994/sajh-d-15-00020.1

Cited by 11 publications

(7 citation statements)

References 25 publications

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“…Finally, there have been no reports of juvenile recaptures in M. montevidensis (Pereira and Maneyro 2016b). Therefore, information about the early juvenile stages of Melanophryniscus species is scarce (Caorsi et al 2012;Caorsi et al 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, information about the early juvenile stages of Melanophryniscus species is scarce (Caorsi et al 2012;Caorsi et al 2014). Young juveniles usually have high mortality rates, which means few are in the environment, and because young use different environments than the adults, they are intrinsically difficult to find (Semlitsch 2008;Walston and Mullin 2008;Pereira and Maneyro 2016b), but it is also plausible that photo-identification methods are not effective when applied to early stages. The determination of the minimum size at which the color pattern stabilizes improves the accuracy of this marking method for juveniles.…”

Section: Discussionmentioning

confidence: 99%

“…As in other species of the genus, newly metamorphosed M. montevidensis may not possess the characteristic color pattern. Furthermore, juveniles are difficult to find and there are no records of juvenile recaptures using photoidentification (Pereira and Maneyro 2016b). Some information about the appearance of the ventral patterns in young juvenile toads is available in the literature (Gollman and Gollman 2011;Caorsi et al 2014), but our study is the first to quantify the development time of the color pattern and estimate the minimum body size at which the color pattern stabilizes and becomes useful for valid photo-identification.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal demography of the threatened Montevideo Redbelly Toad (Melanophryniscus montevidensis) in a protected area of Uruguay

et al. 2019

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Estimates of demographic parameters are scarce for Neotropical amphibians, a concerning fact because this region has the highest proportion of threatened amphibians in the world. We conducted a 3-year study where we applied a robust capture–mark–recapture design to assess the importance of breeding and non-breeding activity patterns over the survival rates, detection probabilities, and abundances of the Montevideo Redbelly Toad (Melanophryniscus montevidensis (Philippi, 1902)), a threatened anuran from Uruguay. The best models grouped seasons into hot and cold periods cyclically, were state-dependent in transition probabilities, and were time-dependent in detection probabilities for adults, but had constant detection probabilities for juveniles. Averaged estimates suggest a high survivorship rate during cold seasons (above 80%), but lower probabilities (below 60%) during hot seasons, especially for males. Analogously, the non-breeding activity had a seasonal pattern, with higher activity during spring and higher sheltering rates during autumn. These activity rates negatively influenced the averaged survivorship rates of adult males and females. Long-term (matrix) projections of seasonal survivorships, along with assessments of the causes of these patterns, should be carried out to determine extinction probabilities and possible threats for the conservation of the genus Melanophryniscus.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seasonal demography of the threatened Montevideo Redbelly Toad (Melanophryniscus montevidensis) in a protected area of Uruguay

et al. 2019

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“…In the BLR the breeding activity of M. montevidensis occurs in shallow temporary water bodies with abundant emergent hydrophilic vegetation (Pereira & Maneyro, 2016a). This species also presents high fidelity to both breeding and shelter sites (mainly rushes and caraguatales near the breeding ponds) (Pereira & Maneyro, 2016b). This information is essential and should be considered in the implementation of the management plan for the area, given that the increasing urbanization of the coastal area and the habitat fragmentation are two of the main causes considered for the decrease in their populations (Carreira & Maneyro, 2015).…”

Section: Family Bufonidaementioning

confidence: 99%

Anurans From Barra De La Laguna De Rocha (Rocha, Uruguay)

Pereira¹,

Elgue²,

Maneyro³

2019

Rev Latin Herp

Self Cite

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We present a list of amphibian species from the protected area Barra de la Laguna de Rocha (BLR), Uruguay. Fifteen monthly three-day field trips were performed between September 2011 and March 2013. During each field trip, active searches of individuals and auditive samplings were performed at seven selected sites. We recorded 19 species of amphibians belonging to five families: Bufonidae (4 especies), Hylidae (5), Leptodactylidae (7), Microhylidae (1) y Odontophrynidae (2). Comparing these data with historical records (obtained from cientific collections and literature), eight species represented new records for the study site. The species richness in the area represents 39.6% of the total richness recorded for Uruguay. We highlight the presence of Melanophryniscus montevidensis (Philippi 1902), a locally and globally threatened species. Information on BLR's amphibian species composition could help in the implementation of the management plan for this conservation unit, as well as to stimulate future studies in the area.

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“…The need to monitor cetacean populations for management purposes typically requires assessments of abundance 1 , 2 , site fidelity 3 , movement patterns 4 , 5 and social structure 6 . A range of methods have been used to examine these parameters including: distance-sampling where line-transect surveys are used to count animals to assess their density 7 , 8 , and mark-recapture (MRC) analysis using sightings (and re-sightings) of naturally or artificially marked individuals as a sample of the population 9 .…”

Section: Introductionmentioning

confidence: 99%

Examining the viability of dorsal fin pigmentation for individual identification of poorly-marked delphinids

Pawley

Hupman

Stockin

et al. 2018

Sci Rep

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Dolphin photo-identification has traditionally relied only on distinctive markings on the dorsal fin—this is problematic for delphinids whose populations exhibit a low mark ratio. We used common dolphins (genus Delphinus) as a model species to assess the viability of using pigmentation for photo-identification. Using a photo-identification catalogue of 169 adult individuals collected between 2002 and 2013, we extracted features that quantified pigmentation in a manner that was robust to lighting artefacts and dorsal fin orientation. We determined the proportion of individuals which exhibited pigmentation and examined temporal stability by (i) visually examining individuals and (ii) testing for seriation. We found 88–91% of images could be manually matched to the correct individual in the catalogue based on pigmentation patterns alone. A linear discriminant analysis classifier correctly identified the correct individual 77% of the time. We found 95% common dolphins exhibited distinctive pigmentation—all of which were temporarily stable. Our work challenges the current thinking that pigmentation is an unreliable feature for delphinid photo-identification and suggests that this feature could be applied to common dolphins and other poorly-marked delphinids.

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Movement Patterns in a Uruguayan Population ofMelanophryniscus montevidensis(Philippi, 1902) (Anura: Bufonidae) Using Photo-Identification for Individual Recognition

Cited by 11 publications

References 25 publications

Seasonal demography of the threatened Montevideo Redbelly Toad (Melanophryniscus montevidensis) in a protected area of Uruguay

Seasonal demography of the threatened Montevideo Redbelly Toad (Melanophryniscus montevidensis) in a protected area of Uruguay

Anurans From Barra De La Laguna De Rocha (Rocha, Uruguay)

Examining the viability of dorsal fin pigmentation for individual identification of poorly-marked delphinids

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