Evaluating the effects of the invasive cane toad (Rhinella marina) on island biodiversity, focusing on the Philippines

2021 ◽  
Author(s):  
Jeffrey A. Harvey ◽  
Priyanka Ambavane ◽  
Mark Williamson ◽  
Arvin Diesmos
Keyword(s):  
The Philippines ◽  
Cane Toad ◽  
Rhinella Marina ◽  
Island Biodiversity

Cane toad ( Rhinella marina ) vitamin A, vitamin E, and carotenoid kinetics

Zoo Biology ◽  
2021 ◽  
Author(s):  
Tarra Freel ◽  
Elizabeth Koutsos ◽  
Larry J. Minter ◽  
Troy Tollefson ◽  
Frank Ridgley ◽  
...  
Keyword(s):  
Vitamin E ◽  
Vitamin A ◽  
Cane Toad ◽  
Rhinella Marina

Changes in urinary testosterone and corticosterone metabolites during short-term confinement with repeated handling in wild male cane toads (Rhinella marina)

2011 ◽  
Vol 59 (4) ◽  
pp. 264 ◽  
Author(s):  
Edward J. Narayan ◽  
Frank C. Molinia ◽  
John F. Cockrem ◽  
Jean-Marc Hero
Keyword(s):  
Adult Male ◽  
Reproductive Effort ◽  
Hormone Secretion ◽  
Reproductive Hormone ◽  
Cane Toad ◽  
Short Term ◽  
Rhinella Marina ◽  
Testosterone Secretion ◽  
Metabolite Concentrations ◽  
Corticosterone Metabolites

Stressors generally decrease testosterone secretion and inhibit reproduction in animals. Urinary testosterone and corticosterone metabolite concentrations were measured in adult male cane toads (Rhinella marina) at the time of capture from the wild and during 24 h of confinement with repeated handling. Mean urinary testosterone concentrations increased 2 h after capture, were significantly elevated above initial concentrations at 5 h, and then declined. Mean testosterone concentrations remained elevated 24 h after capture. Mean urinary corticosterone concentrations increased after capture, were significantly elevated above initial concentrations at 2 h, and remained elevated thereafter. This is the first report in amphibians of an increase in testosterone excretion after capture from the wild, with previous studies showing either no change or decline in testosterone. This finding may be associated with the mating strategy and maintenance of reproductive effort in the cane toad, a species that shows explosive breeding and agonistic male–male interactions during breeding. The finding that testosterone excretion increases rather than decreases after capture in male cane toads shows that it should not be generally assumed that reproductive hormone secretion will decrease after capture in amphibians.

scholarly journals Non-reproductive male cane toads ( Rhinella marina ) withhold sex-identifying information from their rivals

2019 ◽  
Vol 15 (8) ◽  
pp. 20190462 ◽  
Author(s):  
Crystal Kelehear ◽  
Richard Shine
Keyword(s):  
Sexual Identity ◽  
Standardized Tests ◽  
Opportunity Cost ◽  
Cane Toad ◽  
Rhinella Marina ◽  
Secondary Sexual Characteristics ◽  
Sexual Characteristics ◽  
Reproductive Male ◽  
Male Specific ◽  
Do So

A male cane toad ( Rhinella marina ) that mistakenly clasps another male (rather than a female) in a sexual embrace (amplexus) can be induced to dismount by a male-specific ‘release call'. Although that sex-identifying system can benefit both males in that interaction, our standardized tests showed that one-third of male cane toads did not emit release calls when grasped. Most of those silent males were small, had small testes relative to body mass, and had poorly developed secondary sexual characteristics. If emitting a release call is costly (e.g. by attracting predators), a non-reproductive male may benefit by remaining silent; other cues (such as skin rugosity) will soon induce the amplexing male to dismount, and the ‘opportunity cost’ to being amplexed (inability to search for and clasp a female) is minimal for non-reproductive males. Hence, male toads may inform other males about their sexual identity only when it is beneficial to do so.

Transposable elements expression in Rhinella marina (cane toad) specimens submitted to immune and stress challenge

Genetica ◽  
2021 ◽  
Author(s):  
Adriana Ludwig ◽  
Michelle Orane Schemberger ◽  
Camilla Borges Gazolla ◽  
Joana de Moura Gama ◽  
Iraine Duarte ◽  
...  
Keyword(s):  
Transposable Elements ◽  
Cane Toad ◽  
Rhinella Marina

scholarly journals Draft genome assembly of the invasive cane toad, Rhinella marina

GigaScience ◽  
2018 ◽  
Vol 7 (9) ◽  
Author(s):  
Richard J Edwards ◽  
Daniel Enosi Tuipulotu ◽  
Timothy G Amos ◽  
Denis O'Meally ◽  
Mark F Richardson ◽  
...  
Keyword(s):  
Genome Assembly ◽  
Draft Genome ◽  
Cane Toad ◽  
Rhinella Marina ◽  
Draft Genome Assembly

scholarly journals Sex, light, and sound: location and combination of multiple attractants affect probability of cane toad (Rhinella marina) capture

2014 ◽  
Vol 87 (2) ◽  
pp. 323-329 ◽  
Author(s):  
Alyse Yeager ◽  
John Commito ◽  
Andrew Wilson ◽  
Deborah Bower ◽  
Lin Schwarzkopf
Keyword(s):  
Cane Toad ◽  
Sound Location ◽  
Rhinella Marina

scholarly journals Embryonic exposure to conspecific chemicals suppresses cane toad growth and survival

2011 ◽  
Vol 8 (2) ◽  
pp. 226-229 ◽  
Author(s):  
Michael R. Crossland ◽  
Richard Shine
Keyword(s):  
Chemical Cues ◽  
Ecological Impacts ◽  
Cane Toad ◽  
Growth And Survival ◽  
Rhinella Marina ◽  
Embryonic Exposure ◽  
Body Sizes ◽  
Tropical Australia ◽  
Survival And Growth ◽  
Invasive Taxa

Adaptations to suppress the viability of conspecifics may provide novel ways to control invasive taxa. The spread of cane toads ( Rhinella marina ) through tropical Australia has had severe ecological impacts, stimulating a search for biocontrol. Our experiments show that cane toad tadpoles produce waterborne chemical cues that suppress the viability of conspecifics encountering those cues during embryonic development. Brief (72 h) exposure to these cues in the egg and post-hatching phases massively reduced rates of survival and growth of larvae. Body sizes at metamorphosis (about three weeks later) were almost twice as great in control larvae as in tadpole-exposed larvae. The waterborne cue responsible for these effects might provide a weapon to reduce toad recruitment within the species' invaded range.

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