Abstract/Details

Acoustic variation and species discrimination in southeastern sibling species, the cricket frogs <i>Acris crepitans</i> and <i>Acris gryllus</i>


2008 2008

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Abstract (summary)

Mate recognition systems, both the signals produced and the sensory mechanisms to receive them, often diverge to result in pre-mating reproductive isolation between closely related species. Comparative and experimental studies of anurans have contributed to our understanding of this process. By comparing populations of related species in allopatry, sympatry, and syntopy, it is possible to identify the environmental factors associated with divergence in mate recognition systems, including interactions with related species.

Many pairs of species meet along the Fall Zone in the Southeast, but few have been well researched. My study compared the two species of cricket frogs, Acris crepitans and A. gryllus, at 36 sites in North Carolina. I assessed the acoustic and morphological traits used to identify the species, determined the extent of their ranges and sympatry, and identified 4 syntopic sites in the upper Coastal Plain. The dominant frequency and call rate of male vocalizations varied widely and overlapped between the species. Body mass had the largest effect on these features. In contrast, the effects of seasonality and temperature were minor. Additional variation between sites could not be attributed to sympatry or syntopy, so there was no evidence of reproductive character displacement in dominant frequency or call rate.

In playback experiments at a syntopic site, females of both species discriminated between conspecific and heterospecific signals on the basis of click structure, a fine-scale temporal feature, and had no preference for dominant frequency among conspecific signals. Reproductive isolation in Acris is promoted by divergence in the temporal structure of male signals. Only studies like this one, conducted on geographic scales appropriate for comparisons of local populations, can identify patterns of geographic variation in signals that contribute to reproductive isolation.

Indexing (details)


Subject
Ecology;
Zoology
Classification
0329: Ecology
0472: Zoology
Identifier / keyword
Biological sciences; Acoustic; Acris crepitans; Acris gryllus; Cricket frogs
Title
Acoustic variation and species discrimination in southeastern sibling species, the cricket frogs <i>Acris crepitans</i> and <i>Acris gryllus</i>
Author
Micancin, Jonathan P.
Number of pages
168
Publication year
2008
Degree date
2008
School code
0153
Source
DAI-B 69/04, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549536062
Advisor
Wiley, Richard Haven
Committee member
Burmeister, Sabrina; Kier, Bill; Lohmann, Ken; Summers, Kyle
University/institution
The University of North Carolina at Chapel Hill
Department
Biology
University location
United States -- North Carolina
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3304405
ProQuest document ID
304530767
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304530767
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