Explosive breeding in tropical anurans: environmental triggers, community composition and acoustic structure

Type Article
Date 2019-07
Language English
Author(s) Ulloa Juan Sebastian1, 2, Aubin Thierry2, Llusia Diego1, 2, 3, Courtois Elodie A.4, Fouquet Antoine4, 5, Gaucher Philippe4, Pavoine Sandrine6, Sueur Jerome1
Affiliation(s) 1 : Sorbonne Univ, CNRS, EPHE, Inst Syst Evolut Biodiversite ISYEB,Museum Natl H, 57 Rue Cuvier,CP 50, F-75005 Paris, France.
2 : Univ Paris Sud, Neuro PSI CNRS, UMR 9197, Equipe Commun Acoust, Bat446, F-91405 Orsay, France.
3 : Univ Autonoma Madrid, Fac Ciencias, Dept Ecol, TEG, C Darwin 2,Edificio Biol,C-211, E-28049 Madrid, Spain.
4 : Univ Guyane, Ctr Rech Montabo, CNRS IFREMER, LEEISA UMSR 3456, 275 Route Montabo,Cayenne BP 70620, F-97334 Cayenne, France.
5 : Univ Toulouse III Paul Sabatier, Lab Evolut & Diversite Biol, Batiment 4R1,118 Route Narbonne, F-31062 Toulouse 9, France.
6 : Sorbonne Univ, CNRS, Museum Natl Hist Nat, Ctr Ecol & Sci Conservat CESCO, 57 Rue Cuvier,CP 135, F-75005 Paris, France.
Source Bmc Ecology (1472-6785) (Bmc), 2019-07 , Vol. 19 , N. 28 , P. 17p.
DOI 10.1186/s12898-019-0243-y
WOS© Times Cited 27
Keyword(s) Acoustic diversity, Anuran community, Ecoacoustics, Biodiversity monitoring

Background: Anurans largely rely on acoustic communication for sexual selection and reproduction. While multiple studies have focused on the calling activity patterns of prolonged breeding assemblages, species that concentrate their reproduction in short-time windows, explosive breeders, are still largely unknown, probably because of their ephemeral nature. In tropical regions, multiple species of explosive breeders may simultaneously aggregate leading to massive, mixed and dynamic choruses. To understand the environmental triggers, the phenology and composition of these choruses, we collected acoustic and environmental data at five ponds in French Guiana during a rainy season, assessing acoustic communities before and during explosive breeding events. Results: We detected in each pond two explosive breeding events, lasting between 24 and 70h. The rainfall during the previous 48h was the most important factor predicting the emergence of these events. During explosive breeding events, we identified a temporal factor that clearly distinguished pre- and mid-explosive communities. A common pool of explosive breeders co-occurred in most of the events, namely Chiasmocleis shudikarensis, Trachycephalus coriaceus and Ceratophrys cornuta. Nevertheless, the species composition was remarkably variable between ponds and for each pond between the first and the second events. The acoustic structure of explosive breeding communities had outlying levels of amplitude and unexpected low acoustic diversity, significantly lower than the communities preceding explosive breeding events. Conclusions: Explosive breeding communities were tightly linked with specific rainfall patterns. With climate change increasing rainfall variability in tropical regions, such communities may experience significant shifts in their timing, distribution and composition. In structurally similar habitats, located in the same region without obvious barriers, our results highlight the variation in composition across explosive breeding events. The characteristic acoustic structure of explosive breeding events stands out from the circadian acoustic environment being easily detected at long distance, probably reflecting behavioural singularities and conveying heterospecific information announcing the availability of short-lived breeding sites. Our data provides a baseline against which future changes, possibly linked to climate change, can be measured, contributing to a better understanding on the causes, patterns and consequences of these unique assemblages.

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Ulloa Juan Sebastian, Aubin Thierry, Llusia Diego, Courtois Elodie A., Fouquet Antoine, Gaucher Philippe, Pavoine Sandrine, Sueur Jerome (2019). Explosive breeding in tropical anurans: environmental triggers, community composition and acoustic structure. Bmc Ecology, 19(28), 17p. Publisher's official version : https://doi.org/10.1186/s12898-019-0243-y , Open Access version : https://archimer.ifremer.fr/doc/00509/62021/