Eleutherodactylus frogs show frequency but no temporal partitioning: implications for the acoustic niche hypothesis

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Abstract

Individuals in acoustic communities compete for the use of the sound resource for communication, a problem that can be studied as niche competition. The acoustic niche hypothesis presents a way to study the partitioning of the resource, but the studies have to take into account the three dimensions of this niche: time, acoustic frequency, and space. I used an Automated Digital Recording System to determine the partitioning of time and acoustic frequency of eight frogs of the genus Eleutherodactylus from Puerto Rico. The calling activity was measured using a calling index. The community exhibited no temporal partitioning since most species called at the same time, between sunset and midnight. The species partitioned the acoustic frequency of their signals, which, in addition to the microhabitat partitioning, can provide some insight into how these species deal with the problem. This data also suggest that monitoring projects with this group should take place only before midnight to avoid false negatives.

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Major Caribbean and Central American frog faunas originated by ancient oceanic dispersal.

S Blair Hedges, William E Duellman, J M Heinicke (2007)

Approximately one-half of all species of amphibians occur in the New World tropics, which includes South America, Middle America, and the West Indies. Of those, 27% (801 species) belong to a large assemblage, the eleutherodactyline frogs, which breed out of water and lay eggs that undergo direct development on land. Their wide distribution and mode of reproduction offer potential for resolving questions in evolution, ecology, and conservation. However, progress in all of these fields has been hindered by a poor understanding of their evolutionary relationships. As a result, most of the species have been placed in a single genus, Eleutherodactylus, which is the largest among vertebrates. Our DNA sequence analysis of a major fraction of eleutherodactyline diversity revealed three large radiations of species with unexpected geographic isolation: a South American Clade (393 sp.), a Caribbean Clade (171 sp.), and a Middle American Clade (111 sp.). Molecular clock analyses reject the prevailing hypothesis that these frogs arose from land connections with North and South America and their subsequent fragmentation in the Late Cretaceous (80-70 Mya). Origin by dispersal, probably over water from South America in the early Cenozoic (47-29 million years ago, Mya), is more likely.

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Character displacement: ecological and reproductive responses to a common evolutionary problem.

Karin S. Pfennig, David W Pfennig (2009)

Character displacement is the process by which traits evolve in response to selection to lessen resource competition or reproductive interactions between species. Although character displacement has long been viewed as an important mechanism for enabling closely related species to coexist, the causes and consequences of character displacement have not been fully explored. Moreover, character displacement in traits associated with resource use (ecological character displacement) has been largely studied independently of that in traits associated with reproduction (reproductive character displacement). In this review, we underscore the commonalities of these two forms of character displacement and discuss how they interact. We focus on the causes of character displacement and explore how character displacement can have downstream effects ranging from speciation to extinction. In short, understanding how organisms respond to competitive and reproductive interactions with heterospecifics offers key insights into the evolutionary causes and consequences of species coexistence and diversification.

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Real-time bioacoustics monitoring and automated species identification

T. Mitchell Aide, Carlos Corrada-Bravo, Marconi Campos-Cerqueira … (2013)

Traditionally, animal species diversity and abundance is assessed using a variety of methods that are generally costly, limited in space and time, and most importantly, they rarely include a permanent record. Given the urgency of climate change and the loss of habitat, it is vital that we use new technologies to improve and expand global biodiversity monitoring to thousands of sites around the world. In this article, we describe the acoustical component of the Automated Remote Biodiversity Monitoring Network (ARBIMON), a novel combination of hardware and software for automating data acquisition, data management, and species identification based on audio recordings. The major components of the cyberinfrastructure include: a solar powered remote monitoring station that sends 1-min recordings every 10 min to a base station, which relays the recordings in real-time to the project server, where the recordings are processed and uploaded to the project website (arbimon.net). Along with a module for viewing, listening, and annotating recordings, the website includes a species identification interface to help users create machine learning algorithms to automate species identification. To demonstrate the system we present data on the vocal activity patterns of birds, frogs, insects, and mammals from Puerto Rico and Costa Rica.

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Author and article information

Contributors

Luis J. Villanueva-Rivera

Journal

Journal ID (nlm-ta): PeerJ

Journal ID (iso-abbrev): PeerJ

Journal ID (pmc): PeerJ

Journal ID (publisher-id): PeerJ

Title: PeerJ

Publisher: PeerJ Inc. (San Francisco, USA )

ISSN (Electronic): 2167-8359

Publication date (Electronic): 22 July 2014

Publication date Collection: 2014

Volume: 2

Electronic Location Identifier: e496

Affiliations

[-1]Forestry and Natural Resources, Purdue University , West Lafayette, IN, USA

Article

Publisher ID: 496

DOI: 10.7717/peerj.496

PMC ID: 4121589

PubMed ID: 25101228

SO-VID: ff54ac9d-a99a-4e8c-83b3-91bffab215ac

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This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

History

Date received : 9 June 2014

Date accepted : 5 July 2014

Funding

Funded by: National Science Foundation

Award ID: 0223152

This research was funded by a fellowship from the “Attaining Research Extensive University Status in Puerto Rico: Building a Competitive Infrastructure” award from the National Science Foundation (0223152) to the Experimental Program to Stimulate Competitive Research at the University of Puerto Rico, Río Piedras Campus. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Eleutherodactylus frogs show frequency but no temporal partitioning: implications for the acoustic niche hypothesis

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Most cited references 50

Major Caribbean and Central American frog faunas originated by ancient oceanic dispersal.

Character displacement: ecological and reproductive responses to a common evolutionary problem.

Real-time bioacoustics monitoring and automated species identification

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