Life in the Fast Lane: A Review of Rheophily in Freshwater Fishes

Lujan, Nathan K.; Conway, Kevin W.

doi:10.1007/978-3-319-13362-1_6

Cited by 62 publications

(47 citation statements)

References 112 publications

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“…; Schaefer et al. ), Astroblepus and the glyptosterninae contain different, but functionally convergent morphological adaptations that prevent dislodgement in these extreme hydrologic environments (Lujan and Conway ). Furthermore, Astroblepus and glyptosternoids are likely physiologically confined to high altitude Andean and Himalayan environments, respectively (Peng et al.…”

Section: Discussionmentioning

confidence: 99%

“…), which inhabit drainages in both regions that can extend uninterrupted for thousands of vertical meters (Lujan and Conway ). Hydrologic forces imposed by rapid waters in these areas are extreme, offering ecological opportunities for organisms that can adapt to the physical challenges (Lujan and Conway ). However, little is known about how these high‐altitude constraints may drive molecular convergence in aquatic species.…”

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confidence: 99%

“…; Peng et al. ; Lujan and Conway ). Unlike the closely related altitude generalists of each region (Guo et al.…”

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confidence: 99%

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Convergent selection pressures drive the evolution of rhodopsin kinetics at high altitudes via nonparallel mechanisms

et al. 2018

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Convergent selection pressures drive the evolution of rhodopsin kinetics at high altitudes via nonparallel mechanisms

et al. 2018

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“…This study explores the relationship between trophic structure and the distributions of functional traits within assemblages of rapids-adapted fishes in the Xingu River, a major Amazon tributary. Studies in a range of stream and riverine habitats have found evidence of trophic niche partitioning in fishes (Gatz 1981;Ross 1986;Lujan, Winemiller & Armbruster 2012;Montaña, Winemiller & Sutton 2014), and there is strong evidence of convergence in the morphology of rheophilic fishes globally (Lamouroux, Poff & Angermeier 2002;Lujan & Conway 2015). This suggests that fish communities in rapids may experience strong pressure from opposing assembly processes, wherein traits involved in swimming and habitat use tend to converge and feeding traits show divergent patterns (Gatz 1981;Ackerly & Cornwell 2007;Ingram & Shurin 2009).…”

Section: Introductionmentioning

confidence: 99%

Using trophic structure to reveal patterns of trait‐based community assembly across niche dimensions

et al. 2017

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Summary 1.Trait-based approaches for studying community assembly have improved understanding of mechanisms; however, the challenge of interpreting process from pattern is complicated by the possibility of multiple mechanisms operating simultaneously. Different traits may influence the assembly process in different ways. Analysing patterns of functional diversity among co-occurring species for each trait individually may aid interpretation of complex assembly processes; yet, few studies have tested whether patterns vary depending on trait function. 2. We used tropical fish assemblages from the Xingu River, Brazil to test whether traits associated with resource acquisition play a stronger role in niche segregation relative to other traits. First, a null modelling approach was used to determine how trait distributions within local assemblages deviated from expectations under random assembly. Then, correlations between functional traits and stable isotope ratios (d15 N) were used as a measure of a trait's association with trophic structure. Finally, we used mixed effects models to test whether traits having higher correlations with trophic structure also had greater deviation from null expectations. In addition, we explored how well stable isotopes explain multivariate functional trait variation and compared our correlation-based approach for organizing traits with previous categorical approaches. 3. A significant relationship was found between a trait's deviation from null expectations and its correlation with isotopic patterns. Traits strongly associated with trophic structure had greater dispersion from the assemblage mean and were more evenly spaced than weakly associated traits. Traits strongly associated with trophic structure also were more clustered because trophic diversification tended to occur around some basic feeding strategies, such as benthic grazing or capturing food items from the water column. Based on redundancy analysis, isotopic ratios explained a low (11Á6%) but significant portion of trait variation. 4. In this study system, traits strongly associated with trophic ecology were more influential in niche differentiation among coexisting species compared to weakly associated traits. These results suggest that certain traits may respond to assembly mechanisms in predictable ways despite the complex, multidimensional nature of the assembly process. Methods designed to identify differential trait response will be critical to developing a general theory of trait-based community assembly.

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“…Environmental filters structure stream fish assemblages and can act over multiple spatial and temporal scales (Hoeinghaus, Winemiller, & Birnbaum, 2007;Poff, 1997;Poff & Allan, 1995). For stream fishes, high water velocity is a strong environmental stressor that influences their ecology and evolution (Bower & Piller, 2015;Haas, Heins, & Blum, 2015;Lamouroux, Poff, & Angermeier, 2002;Lujan & Conway, 2015;Willis, Winemiller, & Lopez-Fernandez, 2005) because hydraulic drag associated with fast-moving water exerts a high energetic cost (Webb, 1988). Substrate characteristics in streams also affect fish ecology in multiple ways (Kovalenko, Thomaz, & Warfe, 2012).…”

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Intercontinental trends in functional and phylogenetic structure of stream fish assemblages

Bower

Winemiller

2019

Ecology and Evolution

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Understanding of community assembly has been improved by phylogenetic and trait‐based approaches, yet there is little consensus regarding the relative importance of alternative mechanisms and few studies have been done at large geographic and phylogenetic scales. Here, we use phylogenetic and trait dispersion approaches to determine the relative contribution of limiting similarity and environmental filtering to community assembly of stream fishes at an intercontinental scale. We sampled stream fishes from five zoogeographic regions. Analysis of traits associated with habitat use, feeding, or both resulted in more occurrences of trait underdispersion than overdispersion regardless of spatial scale or species pool. Our results suggest that environmental filtering and, to a lesser extent, species interactions were important mechanisms of community assembly for fishes inhabiting small, low‐gradient streams in all five regions. However, a large proportion of the trait dispersion values were no different from random. This suggests that stochastic factors or opposing assembly mechanisms also influenced stream fish assemblages and their trait dispersion patterns. Local assemblages tended to have lower functional diversity in microhabitats with high water velocity, shallow water depth, and homogeneous substrates lacking structural complexity, lending support for the stress‐dominance hypothesis. A high prevalence of functional underdispersion coupled with phylogenetic underdispersion could reflect phylogenetic niche conservatism and/or stabilizing selection. These findings imply that environmental filtering of stream fish assemblages is not only deterministic, but also influences assemblage structure in a fairly consistent manner worldwide.

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Life in the Fast Lane: A Review of Rheophily in Freshwater Fishes

Cited by 62 publications

References 112 publications

Convergent selection pressures drive the evolution of rhodopsin kinetics at high altitudes via nonparallel mechanisms

Convergent selection pressures drive the evolution of rhodopsin kinetics at high altitudes via nonparallel mechanisms

Using trophic structure to reveal patterns of trait‐based community assembly across niche dimensions

Intercontinental trends in functional and phylogenetic structure of stream fish assemblages

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