Abstract
Condition and morphometric changes in tilapia (Oreochromis sp.) after an eradication attempt in Southern Louisiana
Highlights
Previous work has shown that both natural and human impacts can change the morphology of populations. Grant and Grant (2002) and Witte et al (2008) found that changes can occur as a fixed result over years, while Tollrian and Harvell’s (1999) work found it could occur within a generation as phenotypic plasticity
An interaction between standard length and year was not found to be a significant predictor of weight (ANCOVA, d.f = 1, 26; F = 0.10; P =0.760) or body depth
The covariate standard length was found to be significant for both the weight and the body depth ANCOVAs (ANCOVA; d.f. = 1, 27; F = 1041, P < 0.001; ANCOVA; d.f. = 1, 27; F= 539; P < 0.001; respectively)
Summary
Previous work has shown that both natural and human impacts can change the morphology of populations. Grant and Grant (2002) and Witte et al (2008) found that changes can occur as a fixed result over years, while Tollrian and Harvell’s (1999) work found it could occur within a generation as phenotypic plasticity. Previous work has shown that both natural and human impacts can change the morphology of populations. Rapid morphological change has been observed as a response to predation in a variety of species, including plants, cladocerans (Stibor 1992), snails (Brönmark et al 2011) and fishes (Brönmark and Miner 1992). Fish have shown repeatedly that they can alter their body change in response to predators. Additional studies have shown that Western Mosquitofish, Gambusia affinis, can change their morphology in response to predators. In contrast to the Crucian Carp, G. affinis have been shown to decrease their body depth, improving their biomechanical capacity for escape (Langerhans et al 2004). A previous study examining tilapia found that invasive Oreochromis mossambicus exhibit a decrease in body depth when compared to their native populations (Firmat et al 2012)
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