An invasion in slow motion: the spread of invasive cane toads (Rhinella marina) into cooler climates in southern Australia

Macgregor, Lincoln F.; Greenlees, Matthew J.; Bruyn, Mark de; Shine, Richard

doi:10.1007/s10530-021-02597-2

Cited by 9 publications

(9 citation statements)

References 76 publications

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“…Since they were introduced to Queensland (Qld) in 1935, cane toads have spread west across tropical Australia and south along the New South Wales (NSW) coast, sandwiched between mountains to the west and the Pacific Ocean to the east [ 29 , 50 ]. Cane toads are large bufonids whose powerful toxins kill many native Australian vertebrates [ 24 ].…”

Section: Methodsmentioning

confidence: 99%

“…To investigate whether toads from the cool southern (temperate-zone) versus warm northern (tropical) parts of their Australian distribution differ in cold tolerance, we collected adult male and female toads from three populations in tropical Australia (Queensland; centered on 18°00’19.1”S, 146°00’31.1”E, where they have been established for 80 years) and from three populations from the southernmost range-edge in temperate-zone Australia (northeastern New South Wales; centered on 33°56’38.69”S, 147°56’57.41”E) where toads have been present for less than 20 years [ 29 ]. Climatic conditions are much warmer at the tropical site than at the temperate-zone site (see Fig 3 for data on mean monthly air temperatures).…”

Section: Methodsmentioning

confidence: 99%

“…Cane toads in Australia have been intensively studied in this respect, but most attention has focused on the toad’s invasion of tropical habitats [ 24 , 25 ]. At their southeastern (cool-climate) range-edge, cane toads are moving slowly through coastal habitats [ 26 – 29 ]. Low temperatures in this region may be limiting range-expansion [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

“…At their southeastern (cool-climate) range-edge, cane toads are moving slowly through coastal habitats [ 26 – 29 ]. Low temperatures in this region may be limiting range-expansion [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

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No evidence for cold-adapted life-history traits in cool-climate populations of invasive cane toads (Rhinella marina)

et al. 2022

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As an invasive organism spreads into a novel environment, it may encounter strong selective pressures to adapt to abiotic and biotic challenges. We examined the effect of water temperature during larval life on rates of survival and growth of the early life-history stages of cane toads (Rhinella marina) from two geographic regions (tropical vs. temperate) in the species’ invaded range in eastern Australia. If local adaptation at the southern (cool-climate) invasion front has extended the cold-tolerance of early life-stages, we would expect to see higher viability of southern-population toads under cooler conditions. Our comparisons revealed no such divergence: the effects of water temperature on rates of larval survival and growth, time to metamorphosis, size at metamorphosis and locomotor performance of metamorphs were similar in both sets of populations. In two cases where tropical and temperate-zone populations diverged in responses to temperature, the tropical animals performed better at low to medium temperatures than did conspecifics from cooler regions. Adaptation to low temperatures in the south might be constrained by behavioural shifts (e.g., in reproductive seasonality, spawning-site selection) that allow toads to breed in warmer water even in cool climates, by gene flow from warmer-climate populations, or by phylogenetic conservatism in these traits.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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No evidence for cold-adapted life-history traits in cool-climate populations of invasive cane toads (Rhinella marina)

et al. 2022

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“…Despite eDNA-based monitoring has been highly used in terrestrial ecosystems for assessing soil microbial communities through metabarcoding, studies are scarce on what concerns eDNAbased targeted detection of rare animal species, as indicated by our review. The surveyed habitats were variable and included farms (Macgregor et al, 2021;Maslo et al, 2017), temporary wetlands (Feist et al, 2022;Schumer et al, 2019;Tarof et al, 2021), soil ecosystems (which was not certified by peer review) is the author/funder. All rights reserved.…”

Section: Edna-based Targeted Detection Of Rare Animal Species Has Bee...mentioning

confidence: 99%

Catch me if you can: current status and topical issues on the use of eDNA-based targeted detection of rare and endangered animal species

Duarte

Simões

Costa

2023

Preprint

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Animal detection through DNA present in environmental samples (eDNA) is a valuable tool for detecting rare species, that are difficult to observe and monitor. eDNA-based tools are underpinned by molecular evolutionary principles, which are key to devising tools to efficiently single out a targeted species from an environmental sample, using carefully chosen marker regions and customized primers. Here, we present a comprehensive review of the use of eDNA-based methods for the detection of targeted animal species, such as rare, endangered, or invasive species, through the analysis of 460 publications (2008-2022). Aquatic ecosystems have been the most surveyed, in particular, freshwaters (75%), and to a less extent marine (14%) and terrestrial systems (10%). Vertebrates, in particular, fish (38%), and endangered species, have been the most focused in these studies, and Cytb and COI are the most employed markers. Among invertebrates, assays have been mainly designed for Mollusca and Crustacea species (22%), in particular, to target invasive species, and COI has been the most employed marker. Targeted molecular approaches, in particular qPCR, have been the most adopted (73%), while eDNA metabarcoding has been rarely used to target single or few species (approx. 5%). However, less attention has been given in these studies to the effects of environmental factors on the amount of shed DNA, the differential amount of shed DNA among species, or the sensitivity of the markers developed, which may impact the design of the assays, particularly to warrant the required detection level and avoid false negatives and positives. The accuracy of the assays will also depend on the availability of genetic data from closely related species to assess both marker and primers specificity. In addition, eDNA-based assays developed for a particular species may have to be refined taking into account site-specific populations, as well as any intraspecific variation.

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Current status and topical issues on the use of eDNA-based targeted detection of rare animal species

Duarte,

Simões,

Costa

2023

Science of The Total Environment

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An invasion in slow motion: the spread of invasive cane toads (Rhinella marina) into cooler climates in southern Australia

Cited by 9 publications

References 76 publications

No evidence for cold-adapted life-history traits in cool-climate populations of invasive cane toads (Rhinella marina)

No evidence for cold-adapted life-history traits in cool-climate populations of invasive cane toads (Rhinella marina)

Catch me if you can: current status and topical issues on the use of eDNA-based targeted detection of rare and endangered animal species

Current status and topical issues on the use of eDNA-based targeted detection of rare animal species

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