Relevant bibliographies by topics / Frogs defensive mechanisms

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  1. Journal articles
  2. Dissertations / Theses

Academic literature on the topic 'Frogs defensive mechanisms'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Frogs defensive mechanisms"

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Caldwell, Janalee, Laurie Vitt, and William Cooper. "Conspicuousness and vestigial escape behaviour by two dendrobatid frogs, Dendrobates auratus and Oophaga pumilio." Behaviour 146, no. 3 (2009): 325–49. http://dx.doi.org/10.1163/156853909x410946.

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AbstractAposematic prey are thought to move slowly and openly near predators, but exhibit reduced escape behaviour. We studied conspicuousness and escape by aposematic poison frogs (Dendrobates auratus and Oophaga pumilio). In circles of leaf litter, observers detected poison frogs quickly. Flight initiation distance (FID, predator-prey distance when escape begins) increases with approach speed in non-cryptic palatable prey, but not for frogs in clearings, which permitted close approach. On trails frogs moved slowly into forest and FID in D. auratus increased with approach speed. Distance from
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CADLE, JOHN E. "Systematics, natural history, and hemipenial morphology of Dendrophidion brunneum (Günther) (Serpentes: Colubridae), a poorly known snake from the Andes of Ecuador and Peru." Zootaxa 2433, no. 1 (2010): 1. http://dx.doi.org/10.11646/zootaxa.2433.1.1.

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Systematic characters, distribution, natural history, and hemipenial morphology are described for Dendrophidion brunneum (Günther), a poorly known snake from Ecuador and Peru. It has 17 midbody scale rows; 145–165 ventrals; 135–158 subcaudals; a tail 38–44% of total length; a relatively uniform green to brown dorsum; and a maximum length of 1370 mm (700–800 mm SVL). The species occurs from northern Ecuador to 8° S latitude in Peru, primarily on the Pacific slopes of the Andes but with a few documented lowland localities in Peru. Dendrophidion brunneum is diurnal, terrestrial, heliophilic, and
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Chuang, Tsai-Fu, and Yuan-Hsiou Chang. "A New Design Concept of an Ecological Corridor for Frogs to Improve Ecological Conservation." Sustainability 13, no. 20 (2021): 11175. http://dx.doi.org/10.3390/su132011175.

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Ecological corridors are an essential element in conserving the biodiversity and proper functioning of ecosystems. Without their connectivity, a very large number of species would not have access to all of the habitats needed for their life cycles. Although the concept of an ecological corridor has been discussed for many years, few studies on ecological corridors for frogs have been conducted. Frogs are often considered to be a keystone species. They are a good indicator of habitat health, and they are often the first to be harmed by pollution or ecosystem deterioration. However, there have b
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Patocka, Jiri, Eugenie Nepovimova, Blanka Klimova, Qinghua Wu, and Kamil Kuca. "Antimicrobial Peptides: Amphibian Host Defense Peptides." Current Medicinal Chemistry 26, no. 32 (2019): 5924–46. http://dx.doi.org/10.2174/0929867325666180713125314.

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Antimicrobial Peptides (AMPs) are one of the most common components of the innate immune system that protect multicellular organisms against microbial invasion. The vast majority of AMPs are isolated from the frog skin. Anuran (frogs and toads) skin contains abundant AMPs that can be developed therapeutically. Such peptides are a unique but diverse group of molecules. In general, more than 50% of the amino acid residues form the hydrophobic part of the molecule. Normally, there are no conserved structural motifs responsible for activity, although the vast majority of the AMPs are cationic due
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Kuffler, D. P., A. Lyfenko, L. Vyklický, and V. Vlachová. "Cellular Mechanisms of Nociception in the Frog." Journal of Neurophysiology 88, no. 4 (2002): 1843–50. http://dx.doi.org/10.1152/jn.2002.88.4.1843.

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Cellular mechanisms underlying defense reactions induced by noxious heat and acids were studied in frogs ( Rana pipiens) by measuring whole cell membrane currents in cultured dorsal root ganglion (DRG) neurons. Seventy-eight of 82 DRG neurons exposed to 3-s ramps of increasing temperature to 48°C exhibited an inward current ( I HEAT) of 490 ± 70 pA at −70 mV. I HEAT exhibited reversal at ∼10 mV with a pronounced outward rectification, suggesting opening of nonselective cation channels. In frogs, in contrast to mammals, I HEAT was not influenced by capsaicin (5 μM), capsazepine (10 μM), or ruth
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Paluh, Daniel J., Edward L. Stanley, and David C. Blackburn. "Evolution of hyperossification expands skull diversity in frogs." Proceedings of the National Academy of Sciences 117, no. 15 (2020): 8554–62. http://dx.doi.org/10.1073/pnas.2000872117.

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Frogs (Anura) are one of the most diverse vertebrate orders, comprising more than 7,000 species with a worldwide distribution and extensive ecological diversity. In contrast to other tetrapods, frogs have a highly derived body plan and simplified skull. In many lineages of anurans, increased mineralization has led to hyperossified skulls, but the function of this trait and its relationship with other aspects of head morphology are largely unexplored. Using three-dimensional morphological data from 158 species representing all frog families, we assessed wide-scale patterns of shape variation ac
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Lawrence, J. P., Bibiana Rojas, Antoine Fouquet, et al. "Weak warning signals can persist in the absence of gene flow." Proceedings of the National Academy of Sciences 116, no. 38 (2019): 19037–45. http://dx.doi.org/10.1073/pnas.1901872116.

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Aposematic organisms couple conspicuous warning signals with a secondary defense to deter predators from attacking. Novel signals of aposematic prey are expected to be selected against due to positive frequency-dependent selection. How, then, can novel phenotypes persist after they arise, and why do so many aposematic species exhibit intrapopulation signal variability? Using a polytypic poison frog (Dendrobates tinctorius), we explored the forces of selection on variable aposematic signals using 2 phenotypically distinct (white, yellow) populations. Contrary to expectations, local phenotype wa
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8

Boutilier, Robert G. "Mechanisms of metabolic defense against hypoxia in hibernating frogs." Respiration Physiology 128, no. 3 (2001): 365–77. http://dx.doi.org/10.1016/s0034-5687(01)00312-7.

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Alvarez-Buylla, Aurora, Cheyenne Y. Payne, Charles Vidoudez, Sunia A. Trauger, and Lauren A. O’Connell. "Molecular physiology of pumiliotoxin sequestration in a poison frog." PLOS ONE 17, no. 3 (2022): e0264540. http://dx.doi.org/10.1371/journal.pone.0264540.

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Poison frogs bioaccumulate alkaloids for chemical defense from their arthropod diet. Although many alkaloids are accumulated without modification, some poison frog species can metabolize pumiliotoxin (PTX 251D) into the more potent allopumiliotoxin (aPTX 267A). Despite extensive research characterizing the chemical arsenal of poison frogs, the physiological mechanisms involved in the sequestration and metabolism of individual alkaloids remain unclear. We first performed a feeding experiment with the Dyeing poison frog (Dendrobates tinctorius) to ask if this species can metabolize PTX 251D into
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Toledo, Luís Felipe, and Célio F. B. Haddad. "Colors and Some Morphological Traits as Defensive Mechanisms in Anurans." International Journal of Zoology 2009 (2009): 1–12. http://dx.doi.org/10.1155/2009/910892.

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Anurans may be brightly colored or completely cryptic. Generally, in the former situation, we are dealing with aposematism, and the latter is an example of camouflage. However, these are only simple views of what such colorations really mean and which defensive strategy is implied. For instance, a brightly colored frog may be part of a mimicry ring, which could be either Batesian, Müllerian, or Browerian. These are only examples of the diversity of color-usage systems as defensive strategies. Unfortunately, reports on the use of colors as defensive mechanisms are widespread in the available li
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Dissertations / Theses on the topic "Frogs defensive mechanisms"

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Burkart, David. "UNDERSTANDING CHYTRIDIOMYCOSIS RESISTANCE BY INVESTIGATING THE CUTANEOUS DEFENSE MECHANISMS OF MARSUPIAL FROGS." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1835.

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Anurans are declining worldwide because of the spread of Batachochytrium dendrobatidis (Bd), the fungus that causes chytridiomycosis. However, some frogs are resistant to this disease, and understanding why may be critical to saving those that are susceptible. In Peru, Gastrotheca excubitor is resistant to chytridiomycosis while Gastrotheca nebulanastes is susceptible. Two anuran skin defenses, symbiotic bacteria and antimicrobial peptides (AMPs), have demonstrated the ability to inhibit Bd in vitro when isolated from certain frogs. We tested if these defenses can explain the difference in sus
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Smith, Benjamin Paul Chapman. "Characterisation and function of volatile ’defensive’ secretions of two species of Australian tree-frog." Thesis, 2002. http://hdl.handle.net/2440/63559.

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This thesis demonstrates that many frog species, when stressed or challenged, produce odours that are associated with the skin gland secretions, and that the source of these odours can vary. The role of many of these odorous compounds is still unknown. However, it would appear that some odorous compounds have a defensive function and are important components of the secretions.<br>Thesis (Ph.D.) - University of Adelaide, Dept. of Environmental Biology and Dept. of Soil and Water, 2002
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