The New Toad in Town: Distribution of the Asian Toad, <i>Duttaphrynus Melanostictus</i>, in the Toamasina Area of Eastern Madagascar

Moore, Molly; Fidy, Jean François Solofo Niaina; Edmonds, Devin

doi:10.1177/194008291500800210

Cited by 30 publications

(59 citation statements)

References 21 publications

(22 reference statements)

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“…Our SDM also predicts significant overlap between suitable environments for D. melanosticus and numerous global biodiversity hotspots that contain high species richness and endemism, and are subject to significant threat (Mittermeier et al ). For example, our model predicted high environmental suitability in Toasmina in eastern Madagascar, a region where D. melanosticus has recently established alien populations (Kolby , Moore et al ). Madagascar, like Australia, lacks native toad species, placing numerous species at risk (Kolby ).…”

Section: Discussionmentioning

confidence: 94%

Integrating transport pressure data and species distribution models to estimate invasion risk for alien stowaways

Tingley

García‐Díaz

Arantes³

et al. 2017

Ecography

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The number of alien species transported as stowaways is steadily increasing and new approaches are urgently needed to tackle this emerging invasion pathway. We introduce a general framework for identifying high‐risk transport pathways and receiving sites for alien species that are unintentionally transported via goods and services. This approach combines the probability of species arrival at transport hubs with the likelihood that the environment in the new region can sustain populations of that species. We illustrate our approach using a case study of the Asian black‐spined toad Duttaphrynus melanostictus in Australia, a species that is of significant biosecurity concern in Australasia, Indonesia, and Madagascar. A correlative model fitted to occurrence data from the native geographic range of D. melanostictus predicted high environmental suitability at locations where the species has established alien populations globally. Applying the model to Australia revealed that transport hubs with the highest numbers of border interceptions and on‐shore detections of D. melanostictus were environmentally similar to locations within the species’ native range. Numbers of D. melanostictus interceptions and detections in Australia increased over time, but were unrelated to indices of air and maritime trade volume. Instead, numbers of interceptions and detections were determined by the country of origin of airplanes (Thailand) and ships (Indonesia). Thus, the common assumption that transport pressure is correlated with invasion risk does not hold in all cases. Our work builds on previous efforts to integrate transport pressure data and species distribution models, by jointly modelling the number of intercepted and detected stowaways, while incorporating imperfect detection and the environmental suitability of receiving hubs. The approach presented here can be applied to any system for which historical biosecurity data are available, and provides an efficient means to allocate quarantine and surveillance efforts to reduce the probability of alien species establishment.

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Section: Discussionmentioning

confidence: 94%

Integrating transport pressure data and species distribution models to estimate invasion risk for alien stowaways

Tingley

García‐Díaz

Arantes³

et al. 2017

Ecography

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“…The species most commonly found in plantation were Duttaphrynus melanostictus (18 individuals) representing amphibians and T. sexilineatus (45 individuals) representing reptiles. D melanostictus belongs to the family Bufonidae that can be found in areas near settlements including agricultural land (Moore et al 2015). T. sexlineatus had the highest relative abundance value in the plantation, i.e., 31% ( Figure 5).…”

Section: Species Compositionmentioning

confidence: 99%

Short Communication: The herpetofauna around human settlements in Lubuklinggau City, South Sumatra, Indonesia: Composition and diversity

Samitra

Rozi

2020

Biodiversitas

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Abstract. Samitra D, Rozi ZF. 2020. The herpetofauna around human settlements in Lubuklinggau City, South Sumatra, Indonesia: Composition and diversity. Biodiversitas 21: 1432-1437. Herpetofauna research has been conducted mostly in conservation forest areas, so little is known about herpetofauna outside the conservation areas, such as those around the human settlements. The data of herpetofauna near human settlements are important in carrying out conservation actions. This study aimed to determine the diversity of herpetofauna around human settlements in the city of Lubuklinggau. The study was conducted from February to August 2019. Herpetofauna samples were taken in three habitats around settlements, i.e., plantation, rice field, and river. Sampling was done with the method of visual encounter survey and time-constrained search. The data were analyzed using ecological indexes, i.e., relative abundance, and indexes of diversity, evenness, similarity, and dominance. The results showed that 378 individuals of herpetofauna were found, belonging to 27 species (12 amphibians and 15 reptiles). Eighteen species were found in the plantation (7 amphibians and 11 reptiles), 15 species in the river (10 amphibians and 5 reptiles), and 14 species in the rice field (6 amphibians and 8 reptiles). Similarity index analysis showed that the rice field had quite different species from other habitats. The herpetofauna diversity around settlements was categorized as medium.

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“…Therefore, our finding that D. melanostictus may converge with five of the carnivores on the vegetation cover niche axis (a non-climate variable) is also of major concern; this suggests that the toad is capable of expanding beyond its current distribution in Madagascar, which for the moment remains within the urban area of Toamasina and nearby disturbed forests (Moore et al 2015). Model results indicating that D.…”

Section: Niche Similarity and Overlap: Background Testmentioning

confidence: 80%

“…The most cost effective post-introduction strategy is a swift and targeted eradication program while population sizes remain small (Kolby 2014) and it should be undertaken within the urban, agricultural, and Eucalyptus forest areas highlighted by Moore et al (2015) and McClelland et al (2015). Both Pearson (2015) and our results (Online Madagascar -will enable researchers to detect possible niche shifts that may allow it to spread to the interior and more semi-arid regions of the island (e.g., dry deciduous forest).…”

Section: Management and Conservation Implicationsmentioning

confidence: 82%

“…The first reported sighting was in the port city of Toamasina (Kolby 2014;Kull et al 2014) and since then sightings have been mostly in urban areas and degraded forests in the humid eastern regions (Andreone 2014;Kolby 2014;Moore et al 2015). However, this species may not remain confined to such habitats, as it has a wide geographic distribution across many environmental types in Asia (Srinivasulu and Das 2008).…”

Section: Introductionmentioning

confidence: 99%

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Modeling co-occurrence between toxic prey and naïve predators in an incipient invasion

et al. 2016

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Biological invasions can represent important threats to endemic species, including those within the invaders' food webs. The Asian common toad (Duttaphrynus melanostictus) was introduced to Madagascar in 2011. This introduction presents a potentially dangerous prey item to a relatively naïve, highly diverse endemic carnivore fauna. Using a multivariate niche modeling approach (background test), we assessed the predicted niche overlap between D.melanostictus and six endemic carnivores in eastern Madagascar. The overlap between this potential prey and predators was assessed on four environmental niche axes: temperature, precipitation, vegetation cover and elevation. Our results showed a mixture of niche overlap and divergence between D. melanostictus and the six carnivores for environmental axes tested. There was significant overlap with five of the carnivores on temperature and NDVI axes. On the precipitation axis, there was significant overlap between D. melanostictus with two species. Our results suggested that wide-ranging, locally rare carnivores may overlap extensively with D. melanostictus. The six carnivores that inhabit the eastern rainforest of Madagascar will likely share multiple, niche axes with this novel potential prey item. Species that eat the non-native common toad and are susceptible to its toxins are at conservation risk because their populations may not be robust enough to adapt quickly to this threat. We advocate closely monitoring these emerging interactions and suggest a preemptive conservation strategy for carnivores potentially at risk.

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The New Toad in Town: Distribution of the Asian Toad, Duttaphrynus Melanostictus, in the Toamasina Area of Eastern Madagascar

Cited by 30 publications

References 21 publications

Integrating transport pressure data and species distribution models to estimate invasion risk for alien stowaways

Integrating transport pressure data and species distribution models to estimate invasion risk for alien stowaways

Short Communication: The herpetofauna around human settlements in Lubuklinggau City, South Sumatra, Indonesia: Composition and diversity

Modeling co-occurrence between toxic prey and naïve predators in an incipient invasion

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