Houston Toad (Bufo(Anaxyrus)houstonensis) Tadpoles Decrease Their Activity in Response to Chemical Cues Produced from the Predation of Conspecifics and Congeneric (Bufo(Incilius)nebulifer) Tadpoles

2015 ◽  
Vol 49 (2) ◽  
pp. 170-175 ◽  
Author(s):  
Devin B. Preston ◽  
Michael R. J. Forstner
Keyword(s):  
Chemical Cues ◽  
Houston Toad ◽  
Toad Bufo

Assessment of Public Knowledge and Support for Recovery of the Endangered Houston Toad (Bufo houstonensis) in Bastrop, Texas

2012 ◽  
Vol 17 (3) ◽  
pp. 220-224 ◽  
Author(s):  
Melissa C. Jones ◽  
Donald J. Brown ◽  
Ivan Mali ◽  
Audrey McKinney ◽  
Michael R. J. Forstner
Keyword(s):  
Public Knowledge ◽  
Houston Toad ◽  
Bufo Houstonensis ◽  
Toad Bufo

Reproductive Ecology and Hybridization of the Endangered Houston Toad (Bufo houstonensis)

1984 ◽  
Vol 18 (1) ◽  
pp. 56 ◽  
Author(s):  
David M. Hillis ◽  
Ann M. Hillis ◽  
Robert F. Martin
Keyword(s):  
Reproductive Ecology ◽  
Houston Toad ◽  
Bufo Houstonensis ◽  
Toad Bufo

scholarly journals Helminth Parasites of the Endangered Houston Toad, Bufo houstonensis Sanders, 1953 (Amphibia, Bufonidae)

1984 ◽  
Vol 70 (6) ◽  
pp. 1012 ◽  
Author(s):  
Robert A. Thomas ◽  
Steven A. Nadler ◽  
W. Lynn Jagers
Keyword(s):  
Helminth Parasites ◽  
Houston Toad ◽  
Bufo Houstonensis ◽  
Toad Bufo

scholarly journals Documenting Extinction in Real Time: Decline of the Houston Toad on a Primary Recovery Site

2014 ◽  
Vol 5 (2) ◽  
pp. 363-371 ◽  
Author(s):  
Adam Duarte ◽  
Donald J. Brown ◽  
Michael R.J. Forstner
Keyword(s):  
East Central ◽  
High Resolution Data ◽  
High Severity ◽  
Drift Fence ◽  
Recovery Strategies ◽  
Central Texas ◽  
Houston Toad ◽  
Near Future ◽  
Toad Bufo

Abstract The Houston toad Bufo (Anaxyrus) houstonensis is a federally endangered amphibian endemic to east central Texas and is primarily found in the Lost Pines ecoregion. In 2010, we became cautiously optimistic regarding the recovery of the species on the Griffith League Ranch, one of the toad's primary recovery sites, after an unusually successful reproductive season. Subsequently, the extreme drought throughout Texas deepened, culminating in the fall 2011 high-severity wildfires throughout the Lost Pines ecoregion. After the drought and wildfires, we continued to intensively monitor Houston toads via anuran call surveys, drift fence arrays, and visual observations of reproduction. Our objective was to investigate the dynamics of the Houston toad population on the Griffith League Ranch during these dramatic impacts to its habitat and to discuss the potential for Houston toad recovery in the ecoregion. In summary, both a simulation model and our field monitoring data suggest the Houston toad population on the Griffith League Ranch is at critically low numbers and may be extirpated in the near future if human-mediated recovery strategies are not continued and refined. We do not discern any evidence to suggest the 2011 wildfires have had any direct detrimental impacts on subsequent Houston toad population dynamics. Still, high-resolution data will be needed in the future to quantify how the wildfires affected Houston toad viability over the medium and long term.

scholarly journals Estimating Abundance of the Endangered Houston Toad on a Primary Recovery Site

2011 ◽  
Vol 2 (2) ◽  
pp. 207-215 ◽  
Author(s):  
Adam Duarte ◽  
Donald J. Brown ◽  
Michael R.J. Forstner
Keyword(s):  
Model Averaging ◽  
Time Model ◽  
Robust Estimate ◽  
Abundance Estimate ◽  
Management Actions ◽  
Open Population ◽  
Houston Toad ◽  
The Impact ◽  
Toad Bufo ◽  
Future Management

Abstract The Griffith League Ranch is one of the primary recovery sites for the endangered Houston toad Bufo (Anaxyrus) houstonensis. New recovery initiatives have recently been implemented to increase Houston toad abundance; however, no robust estimate of population size has been conducted in the last decade of study, nor from this recovery site. To assist with inferences regarding efficacy of current and future management actions, we estimated adult Houston toad abundance on the Griffith League Ranch. Houston toads were sampled at breeding ponds during the 2010 breeding season using a mark–recapture methodology. We analyzed the data using a modified Jolly–Seber open population model in Program MARK. Models were built whereby the probability of capture remained constant, the apparent survival varied with time or was constant, and the probability of entry varied with time. Model averaging was used to account for uncertainty and the derived adult male Houston toad abundance ranged from 201 to 307 individuals. Using a previously determined Griffith League Ranch Houston toad functional sex ratio of 5∶1, we estimated the abundance of the total adult Houston toad population on this primary recovery site to be from 241 to 368 individuals. This study is the first to report a robust abundance estimate of a Houston toad population and provides a foundation for further research to quantify the impact of current and future management actions.

Is Bigger Always Better? Mate Selection in the Houston Toad (Bufo houstonensis)

2011 ◽  
Vol 45 (4) ◽  
pp. 455-456 ◽  
Author(s):  
Melissa C. Jones ◽  
James R. Dixon ◽  
Michael R. J. Forstner
Keyword(s):  
Mate Selection ◽  
Houston Toad ◽  
Bufo Houstonensis ◽  
Toad Bufo

scholarly journals The role of adult fiddler crab environmental acoustic cues and chemical cues in stimulating molting of field-caught megalopae

2021 ◽  
Vol 537 ◽  
pp. 151516
Author(s):  
Emily E. Waddell ◽  
Wendy E.D. Piniak ◽  
Kathleen A. Reinsel ◽  
James M. Welch
Keyword(s):  
Chemical Cues ◽  
Fiddler Crab ◽  
Acoustic Cues

scholarly journals Interactions of ants with native and invasive lady beetles and the role of chemical cues in intraguild interference

Chemoecology ◽  
2021 ◽  
Author(s):  
Roman Bucher ◽  
Laura M. Japke ◽  
Ayse Gül Ünlü ◽  
Florian Menzel
Keyword(s):  
Chemical Cues ◽  
Harmonia Axyridis ◽  
Species Recognition ◽  
Lady Beetle ◽  
Lasius Niger ◽  
Beetle Species ◽  
Beetle Elytra ◽  
Lady Beetles ◽  
Ant Aggression

AbstractThe predator-predator naïveté hypothesis suggests that non-native predators benefit from being unknown to native predators, resulting in reduced intraguild interference with native predators. This novelty advantage should depend on the ability of native predators to recognize cues of non-native predators. Here, we compared ant aggression and lady beetle reaction in four native and the invasive lady beetle species Harmonia axyridis. In addition, we tested whether lady beetle cuticular hydrocarbons (CHCs) are involved in species recognition, which might explain naïveté if the invasive species has a specific CHC profile. To this end, we conducted behavioral assays confronting two native ant species with both living lady beetles and lady beetle elytra bearing or lacking CHCs of different lady beetle species. Finally, we characterized CHC profiles of the lady beetles using GC–MS. In general, the aggression of Lasius niger was more frequent than that of Myrmica rubra and L. niger aggression was more frequent towards most native lady beetle species compared to H. axyridis. The removal of CHCs from lady beetle elytra reduced aggression of both ant species. If CHCs of respective lady beetle species were added on cue-free elytra, natural strength of L. niger aggression could be restored. CHC analyses revealed a distinct cue composition for each lady beetle species. Our experiments demonstrate that the presence of chemical cues on the surface of lady beetles contribute to the strength of ant aggression against lady beetles. Reduced aggression of L. niger towards H. axyridis and reduced avoidance behavior in H. axyridis compared to the equally voracious C. septempunctata might improve the invasive lady beetle’s access to ant-tended aphids.

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