Neuroscience 2005 Abstract
| Presentation Number: | 1001.10 |
|---|---|
| Abstract Title: | Geographic divergence and convergence in electric signaling behavior in weakly electric fish. |
| Authors: |
Jones, R. J.*2
; Hawkins, C.1
; Schmitt, R.3
; Alves-Gomes, J. A.3
; Braun, C. B.1,2
1Psychology, Hunter Col., CUNY, New York, NY 2NY, 695 Park Ave, 10021, 3USA, 695 Park Ave, 10021, |
| Primary Theme and Topics |
Cognition and Behavior - Neuroethology -- Vocal/social communication |
| Secondary Theme and Topics | Cognition and Behavior<br />- Neuroethology<br />-- Sensory systems |
| Session: |
1001. Vocal/Social Communication: Fish and Amphibians Poster |
| Presentation Time: | Wednesday, November 16, 2005 2:00 PM-3:00 PM |
| Location: | Washington Convention Center - Hall A-C, Board # NN17 |
| Keywords: | EVOLUTION, SENSORIMOTOR, ELECTROSENSORY, COMMUNICATION |
Weakly electric fish are an excellent model to study biogeographic and species differences in behavior. The electric organ discharge (EOD) is a quantifiable behavior that is easily compared across species and correlated with genetic data reflecting gene transfer between populations. Here we report on variation in EOD and mtDNA in two sympatric species-complexes found throughout the Amazon basin. Microsternarchus and Hypopygus are small gymnotiforms found in mixed species groups in 2º and 3º tributaries. These potentially isolated populations provide the opportunity to test the relationship between geographic isolation, sympatry and behavioral isolation in speciation.
Fish were collected during two expeditions to the Rio Negro (12/02, 3/05) both during breeding season. Genetic and EOD data were analyzed from 339 individuals of Hypopygusand 167 of Microsternarchus. Variation in EOD and genotype was not perfectly congruent but some trends are apparent. We suggest that there are four species of Hypopygus and three species of Microsternarchus in our samples.
The species of Hypopygus (H.lepturus, neblinae, sp. 1 and 2) display differences in EOD duration, spectral composition, and rate. Although species are clearly discernible, populations overlap in EOD parameters and there is no evidence for increased differences between sympatric populations. In Microsternarchus, three genetic species can be recognized, one of which is relatively distinct in geographic distribution and EOD waveform from the other two. The other two putative species show clear genetic differences but also show evidence for both local adaptation and species divergence in EOD waveform. Geographic differences are more prominent than species differences, suggesting local adaptation rather than behavioral isolation between sympatric populations.
Fish were collected during two expeditions to the Rio Negro (12/02, 3/05) both during breeding season. Genetic and EOD data were analyzed from 339 individuals of Hypopygusand 167 of Microsternarchus. Variation in EOD and genotype was not perfectly congruent but some trends are apparent. We suggest that there are four species of Hypopygus and three species of Microsternarchus in our samples.
The species of Hypopygus (H.lepturus, neblinae, sp. 1 and 2) display differences in EOD duration, spectral composition, and rate. Although species are clearly discernible, populations overlap in EOD parameters and there is no evidence for increased differences between sympatric populations. In Microsternarchus, three genetic species can be recognized, one of which is relatively distinct in geographic distribution and EOD waveform from the other two. The other two putative species show clear genetic differences but also show evidence for both local adaptation and species divergence in EOD waveform. Geographic differences are more prominent than species differences, suggesting local adaptation rather than behavioral isolation between sympatric populations.
Supported by INPA and grants from PSC-CUNY (663260035) and Hunter College to CBB.
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2005 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2005. Online.
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