Tracking activity patterns of a multispecies community of gymnotiform weakly electric fish in their neotropical habitat without tagging

被引:19
|
作者
Henninger, Joerg [1 ]
Krahe, Ruediger [2 ,3 ]
Sinz, Fabian [4 ,5 ,6 ,7 ]
Benda, Jan [1 ,4 ]
机构
[1] Eberhard Karls Univ Tubingen, Inst Neurobiol, D-72076 Tubingen, Germany
[2] Humboldt Univ, Inst Biol, Philippstr 13, D-10115 Berlin, Germany
[3] McGill Univ, Dept Biol, 1205 Ave Docteur Penfield, Montreal, PQ H3A 1B1, Canada
[4] Eberhard Karls Univ Tubingen, Bernstein Ctr Computat Neurosci, D-72076 Tubingen, Germany
[5] Eberhard Karls Univ Tubingen, Inst Informat, D-72076 Tubingen, Germany
[6] Baylor Coll Med, Dept Neurosci, Houston, TX 77030 USA
[7] Baylor Coll Med, Ctr Neurosci & Artificial Intelligence, Houston, TX 77030 USA
来源
JOURNAL OF EXPERIMENTAL BIOLOGY | 2020年 / 223卷 / 03期
基金
加拿大自然科学与工程研究理事会;
关键词
Animal behavior; Localization; Electrosensory scenes; Movements; Nocturnal; ORGAN DISCHARGES; ELECTROCOMMUNICATION BEHAVIOR; COMMUNICATION SIGNALS; APTERONOTUS-ALBIFRONS; JAMMING AVOIDANCE; SEX-DIFFERENCES; WAVE; ELECTRORECEPTORS; MOVEMENTS; ECOLOGY;
D O I
10.1242/jeb.206342
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Field studies on freely behaving animals commonly require tagging and often are focused on single species. Weakly electric fish generate a species- and individual-specific electric organ discharge (EOD) and therefore provide a unique opportunity for individual tracking without tagging. Here, we present and test tracking algorithms based on recordings with submerged electrode arrays. Harmonic structures extracted from power spectra provide fish identity. Localization of fish based on weighted averages of their EOD amplitudes is found to be more robust than fitting a dipole model. We apply these techniques to monitor a community of three species, Apteronotus rostratus, Eigenmannia humboldtii and Sternopygus dariensis, in their natural habitat in Darie ' n, Panama. We found consistent upstream movements after sunset followed by downstream movements in the second half of the night. Extrapolations of these movements and estimates of fish density obtained from additional transect data suggest that some fish cover at least several hundreds of meters of the stream per night. Most fish, including E. humboldtii, were traversing the electrode array solitarily. From in situ measurements of the decay of the EOD amplitude with distance of individual animals, we estimated that fish can detect conspecifics at distances of up to 2 m. Our recordings also emphasize the complexity of natural electrosensory scenes resulting from the interactions of the EODs of different species. Electrode arrays thus provide an unprecedented window into the so-far hidden nocturnal activities of multispecies communities of weakly electric fish at an unmatched level of detail.
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页数:18
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