Résumé
Most male frogs produce calls to attract females and repel rivals. The transmission of these calls can be affected by many acoustic and environmental characteristics, which can influence the detection and decoding of the signal by the receiver. Calling-perch height has a strong influence on sound propagation and acoustic spacing with neighboring males, but how frogs optimize their calling behavior in this context is poorly understood. In this study, we investigated if and how frogs can adjust the calling energy in the context of acoustic spacing. Our aim was to evaluate the relationship between calling-perch height, nearest-neighbor distance, and sound-pressure level in the brilliant-thighed poison frog Allobates femoralis. We found that frogs flexibly adjust the calling amplitude according to the calling-perch height without affecting the effectiveness signal propagation. Accompanying signal propagation experiments demonstrated that calls produced with lower amplitude from higher perches propagate similar to louder calls from the ground. Our results suggest an adjustment to the hypothesis of a general positive effect of calling-perch height on signal effectiveness, where highly territorial frogs adjust their calling behavior to reduce energy expenditure and optimize acoustic communication with conspecifics.
Auteurs, date et publication :
Auteurs Camilo Rodríguez , Adolfo Amézquita , Max Ringler , Andrius Pašukonis , Walter Hödl
Publication : Behavioral Ecology and Sociobiology
Date : 2025
Volume : 74
Issue : 6
Pages : 76
Catégorie(s)
#CNRS #FORET NouraguesRésumé
An important focus of community ecology, including invasion biology, is to investigate functional trait diversity patterns to disentangle the effects of environmental and biotic interactions. However, a notable limitation is that studies usually rely on a small and easy-to-measure set of functional traits, which might not immediately reflect ongoing ecological responses to changing abiotic or biotic conditions, including those that occur at a molecular or physiological level. We explored the potential of using the diversity of expressed genes—functional genomic diversity (FGD)—to understand ecological dynamics of a recent and ongoing alpine invasion. We quantified FGD based on transcriptomic data measured for 26 plant species occurring along adjacent invaded and pristine streambeds. We used an RNA-seq approach to summarize the overall number of expressed transcripts and their annotations to functional categories, and contrasted this with functional trait diversity (FTD) measured from a suite of characters that have been traditionally considered in plant ecology. We found greater FGD and FTD in the invaded community, independent of differences in species richness. However, the magnitude of functional dispersion was greater from the perspective of FGD than from FTD. Comparing FGD between congeneric alien–native species pairs, we did not find many significant differences in the proportion of genes whose annotations matched functional categories. Still, native species with a greater relative abundance in the invaded community compared with the pristine tended to express a greater fraction of genes at significant levels in the invaded community, suggesting that changes in FGD may relate to shifts in community composition. Comparisons of diversity patterns from the community to the species level offer complementary insights into processes and mechanisms driving invasion dynamics. FGD has the potential to illuminate cryptic changes in ecological diversity, and we foresee promising avenues for future extensions across taxonomic levels and macro-ecosystems.
Auteurs, date et publication :
Auteurs Hannah E. Marx , Marta Carboni , Rolland Douzet , Christophe Perrier , Franck Delbart , Wilfried Thuiller , Sébastien Lavergne , David C. Tank
Publication : Ecology and Evolution
Date : 2025
Volume : 11
Issue : 17
Pages : 12075-12091
Catégorie(s)
#ANR-Citation #CNRS #Lautaret #UGAAuteurs, date et publication :
Auteurs Lore T Verryckt , David S Ellsworth , Sara Vicca , Leandro Van Langenhove , Josep Peñuelas , Philippe Ciais , Juan M Posada , Clément Stahl , Sabrina Coste , Elodie A Courtois
Publication : Biotropica
Date : 2025
Volume : 52
Issue : 6
Pages : 1183-1193
Catégorie(s)
#ANR-Citation #CIRAD #CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Geertje MF van der Heijden , Ted R Feldpausch , Ana de la Fuente Herrero , Naomi K van der Velden , Oliver L Phillips
Publication : Forest Ecology and Management
Date : 2025
Volume : 260
Issue : 4
Pages : 549-555
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs James P Tumulty , Andrius Pašukonis , Max Ringler , James D Forester , Walter Hödl , Mark A Bee
Publication : Animal behaviour
Date : 2025
Volume : 141
Pages : 203-220
Catégorie(s)
#ANR-Citation #CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Magdalena Erich , Max Ringler , Walter Hödl , Eva Ringler
Publication : Behavioral ecology and sociobiology
Date : 2025
Volume : 69
Issue : 6
Pages : 1011-1017
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Emanuel A Fronhofer , Delphine Legrand , Florian Altermatt , Armelle Ansart , Simon Blanchet , Dries Bonte , Alexis Chaine , Maxime Dahirel , Frederik De , Jonathan De Raedt , Lucie di Gesu , Staffan Jacob , Oliver Kaltz , Chelsea J Little , Luc Madec , Florent Manzi , Stefano Masier , Frank Pennekamp , Nicolas Schtickzelle , Lieven Therry
Publication : Nature Ecology and Evolution
Date : 2025
Volume : 2
Pages : 1859-1863
Catégorie(s)
#CNRS #Metatron terrestreAuteurs, date et publication :
Auteurs Loïc Harrault , Béatrice Allard , Jacques Mériguet , David Carmignac , Sylvain Huon , Benoit Gauzens , Gérard Lacroix
Publication : Freshwater Biology
Date : 2025
Volume : 59
Issue : 8
Pages : 1695-1709
Catégorie(s)
#CNRS #ENS #PLANAQUARésumé
The influence of climate change on the ecological impacts of invasive alien species (IAS) remains understudied, with deoxygenation of aquatic environments often-overlooked as a consequence of climate change. Here, we therefore assessed how oxygen saturation affects the ecological impact of a predatory invasive fish, the Ponto-Caspian round goby (Neogobius melanostomus), relative to a co-occurring endangered European native analogue, the bullhead (Cottus gobio) experiencing decline in the presence of the IAS. In individual trials and mesocosms, we assessed the effect of high, medium and low (90%, 60% and 30%) oxygen saturation on: (1) functional responses (FRs) of the IAS and native, i.e. per capita feeding rates; (2) the impact on prey populations exerted; and (3) how combined impacts of both fishes change over invasion stages (Pre-invasion, Arrival, Replacement, Proliferation). Both species showed Type II potentially destabilising FRs, but at low oxygen saturation, the invader had a significantly higher feeding rate than the native. Relative Impact Potential, combining fish per capita effects and population abundances, revealed that low oxygen saturation exacerbates the high relative impact of the invader. The Relative Total Impact Potential (RTIP), modelling both consumer species’ impacts on prey populations in a system, was consistently higher at low oxygen saturation and especially high during invader Proliferation. In the mesocosm experiment, low oxygen lowered RTIP where both species were present, but again the IAS retained high relative impact during Replacement and Proliferation stages at low oxygen. We also found evidence of multiple predator effects, principally antagonism. We highlight the threat posed to native communities by IAS alongside climate-related stressors, but note that solutions may be available to remedy hypoxia and potentially mitigate impacts across invasion stages.
Auteurs, date et publication :
Auteurs James W. E. Dickey , Neil E. Coughlan , Jaimie T. A. Dick , Vincent Médoc , Monica McCard , Peter R. Leavitt , Gérard Lacroix , Sarah Fiorini , Alexis Millot , Ross N. Cuthbert
Publication : Biological Invasions
Date : 2021
Catégorie(s)
#ANR-Citation #CNRS #Ecotron IleDeFrance #ENSAuteurs, date et publication :
Auteurs Lucie Zinger , Pierre Taberlet , Heidy Schimann , Aurélie Bonin , Frédéric Boyer , Marta De Barba , Philippe Gaucher , Ludovic Gielly , Charline Giguet‐Covex , Amaia Iribar
Publication : Molecular Ecology
Date : 2025