A New Invasive Freshwater Fish Species in Central Chile: Jenynsia Multidentata (Jenyns, 1842) (Cyprinodontiformes: Anablepidae)

Quezada‐Romegialli, Claudio; Vila, Irma; Véliz, David

doi:10.4067/s0717-65382009000200007

Cited by 6 publications

(4 citation statements)

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“…Chile's native fishes have ancestral traits such as small body sizes (Vila et al 1999;) and sparse development of locomotion attributes (Zunino et al 1999); they also exhibit low variation in life histories and tolerances for habitat degradation as well as narrow geographical distributions (Habit et al 2006a). These attributes are in stark contrast with those from several of the 27 nonnative species documented in the literature (Iriarte et al 2005;Habit et al 2006b;Quezada-Romegialli et al 2009). These introductions have affected native fishes due to predation (Ibarra et al 2011;Arismendi et al 2012), interactive segregation ), overlap of microhabitat preferences (Vargas et al 2010), and changes in local distributions Habit et al 2010).…”

Section: Introductioncontrasting

confidence: 52%

Evaluating taxonomic homogenization of freshwater fish assemblages in Chile

Vargas

Arisméndi

Gomez‐Uchida

2015

Rev. Chil. de Hist. Nat.

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Background: Pervasive introductions of non-native taxa are behind processes of homogenization of various types affecting the global flora and fauna. Chile's freshwater ecosystems encompass a diverse and highly endemic fish fauna that might be sensitive to the introduction of non-native species, an ongoing process that started two centuries ago, but has to date received little attention. Using historical (native) and present-day (native and non-native) presence-absence data sets of compositional similarity, our goal was twofold: (1) evaluate patterns of taxonomic homogenization at various spatial scales and (2) identify clusters of widely versus narrowly distributed species to assess their relative role in compositional changes. We expect that non-native species with wide distributions might have a larger influence in taxonomic homogenization than those with narrow distributions.

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Section: Introductioncontrasting

confidence: 52%

Evaluating taxonomic homogenization of freshwater fish assemblages in Chile

Vargas

Arisméndi

Gomez‐Uchida

2015

Rev. Chil. de Hist. Nat.

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“…This also concurs with the invasive success of this species recently reported from Chile (Quezada-Romegialli et al, 2009). In conclusion, it emphasises why direct removal by fishing, aiming at promoting an increase of the zooplankton grazing pressure on phytoplankton in such systems, may not be useful as a restoration tool of eutrophic-turbid lakes as a consequence of the fast recolonisation.…”

Section: Discussionsupporting

confidence: 91%

Analysis of the reproductive strategy of Jenynsia multidentata (Cyprinodontiformes, Anablepidae) with focus on sexual differences in growth, size, and abundance

2011

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Jenynsia multidentata is one of the most abundant freshwater fishes in the subtropical region of South America and when abundant it appears to have a major impact on lake ecosystems function. We studied the life-history traits and population structure of J. multidentata in a shallow lake in Uruguay, and collected literature data along a subtropical to tropical freshwater gradient in South America. Our general focus was on reproductive strategy, particularly on sexual differences in growth, size and abundance. In Lake Blanca, we found strong reverse size dimorphism (RSD) and a feminized sex ratio. Both are attributed to sexual differences in growth patterns and longevity. RSD and a feminized sex ratio seem to characterise J. multidentata regardless of latitude, and together with other life traits such as small size, rapid growth, low age of maturity, the capacity of the females to keep sperm alive to fertilize several successive litters, high natural mortality and fertility, resistance to extreme environmental conditions and omnivory, they are indicative of high productivity to biomass ratio. The very high population growth rate helps to explain why fish removal, aiming to promote an increase in the zooplankton grazing pressure on phytoplankton, may not be a useful tool in eutrophic-turbid subtropical South American lakes. We also found that the duration of the breeding season deviated markedly with latitude, increasing towards the tropics, which may have major consequences for population growth rates and differential impact of this species on lake ecosystems in the different climate zones.

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“…Considering that watersheds in which these species are distributed are those with the greatest alterations in their aquatic systems (Vila et al 1999;Dyer 2000;Habit et al 2006;Quezada-Romegialli et al 2009), these variable microsatellites will be useful in future genetic conservation plans, allowing the monitoring of changes in allele frequencies over time, and complementing studies of genetic migration within and between watersheds, spatial structure of the populations and paternity analysis of Basilichthys and Odonthestes in Chile.…”

Section: Most Of Aquatic Species With Conservation Problems Inmentioning

confidence: 99%