NDLI: Environmental complexity, seasonality and brain cell proliferation in a weakly electric fish, Brachyhypopomus gauderio

Content Provider	PubMed Central
Author	Dunlap, Kent D. Silva, Ana C. Chung, Michael
Copyright Year	2011
Abstract	Environmental complexity and season both influence brain cell proliferation in adult vertebrates, but their relative importance and interaction have not been directly assessed. We examined brain cell proliferation during both the breeding and non-breeding seasons in adult male electric fish, Brachyhypopomus gauderio, exposed to three environments that differed in complexity: (1) a complex natural habitat in northern Uruguay, (2) an enriched captive environment where fish were housed socially and (3) a simple laboratory setting where fish were isolated. We injected fish with BrdU 2.5 h before sacrifice to label newborn cells. We examined the hindbrain and midbrain and quantified the density of BrdU+ cells in whole transverse sections, proliferative zones and two brain nuclei in the electrocommunication circuitry (the pacemaker nucleus and the electrosensory lateral line lobe). Season had the largest effect on cell proliferation, with fish during the breeding season having three to seven times more BrdU+ cells than those during the non-breeding season. Although the effect was smaller, fish from a natural environment had greater rates of cell proliferation than fish in social or isolated captive environments. For most brain regions, fish in social and isolated captive environments had equivalent levels of cell proliferation. However, for brain regions in the electrocommunication circuitry, group-housed fish had more cell proliferation than isolated fish, but only during the breeding season (season × environment interaction). The regionally and seasonally specific effect of social environment on cell proliferation suggests that addition of new cells to these nuclei may contribute to seasonal changes in electrocommunication behavior.
Related Links	http://dx.doi.org/10.1242/jeb.051037
Ending Page	805
Page Count	12
Starting Page	794
File Format	PDF
ISSN	00220949
e-ISSN	14779145
Journal	The Journal of Experimental Biology
Issue Number	5
Volume Number	214
Language	English
Publisher	Company of Biologists
Publisher Date	2011-03-01
Access Restriction	Open
Rights Holder	Company of Biologists
Subject Keyword	Insect Science Animal Science and Zoology Aquatic Science Physiology Ecology, Evolution, Behavior and Systematics Molecular Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Aquatic Science Molecular Biology Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Insect Science

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