NDLI: Nonnative African jewelfish are more fit but not bolder at the invasion front: a trait comparison across an Everglades range expansion

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Nonnative African jewelfish are more fit but not bolder at the invasion front: a trait comparison across an Everglades range expansion

Content Provider	Springer Nature Link
Author	Lopez, D. P. Jungman, A. A. Rehage, J. S.
Copyright Year	2012
Abstract	Invasive species present a global threat to natural ecosystems and native biodiversity. Previous studies have shown that invasive range expansion is often related to the invader’s life histories and dispersal behavior. Among behavioral traits, boldness is a key trait that may aid species in performing well in novel environments. Thus, along a species’ invaded range, individuals from the invasion front should be bolder, better dispersers, and have life histories that maximize population growth relative to established populations. We tested these hypotheses with the invasion of the African jewelfish Hemichromis letourneuxi in Everglades National Park (ENP). Jewelfish entered ENP in 2000, and since then they have expanded their range rapidly but traceably. Our study examined variation in reproductive investment, body condition, gut fullness, boldness, and dispersal behavior across six wild-caught populations of African jewelfish. Boldness and dispersal were tested using an emergence-activity test and an emergence-dispersal test in large, outdoor experimental setups. We dissected fish from the six populations to assess life histories. Populations from the invasion front (western ENP) had higher reproductive investment, higher gut fullness, and better body condition, but they were not relatively bolder nor better dispersers than inner populations (eastern ENP). As the invasion progressed, lower intraspecific density at the invasion front may have relaxed competition and allowed for higher fitness and reproductive investment. Understanding underlying behavioral and life-history mechanisms of an invasion is key for the development of management strategies that aim to contain current invaders and prevent the spread of future ones.
Starting Page	2159
Ending Page	2174
Page Count	16
File Format	PDF
ISSN	13873547
Journal	Biological Invasions
Volume Number	14
Issue Number	10
e-ISSN	15731464
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-05-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Range expansion Fish Boldness Dispersal tendency Life history traits Invasion front Developmental Biology Plant Sciences Freshwater & Marine Ecology Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics

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Nonnative African jewelfish are more fit but not bolder at the invasion front: a trait comparison across an Everglades range expansion

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Nonnative African jewelfish are more fit but not bolder at the invasion front: a trait comparison across an Everglades range expansion