Climbing behavior of Cordylancistrus sp. in the Colombian Andes

Maldonado-Ocampo, Javier A.; Urbano-Bonilla, Alexander

doi:10.11144/javeriana.sc20-2.cbcc

Cited by 10 publications

(2 citation statements)

References 25 publications

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“…GF is a multivariate analysis that comprises two main steps. The first one consists in modeling how the abundance of each taxon varies in response to environmental variables using random forest models (RF, Breiman, 2001). During a second step, the RF models obtained for each taxon are aggregated in order to calculate the overall importance of each environmental variable.…”

Section: Data Analysesmentioning

confidence: 99%

“…Beyond the geographical scale, the relative importance of niche-and dispersal-based processes is also influenced by species-specific traits (Soininen, 2010). For example, some fish species have developed specific behaviors adapted to their physiological and anatomical traits that allow them to pass barriers swimmers cannot get beyond (Carvajal-Quintero et al, 2015;Schoenfuss & Blob, 2003). Consequently, these species have enhanced active dispersal abilities (Jenkins et al, 2007) which limit the importance of dispersal-based process in structuring their populations.…”

Section: Introductionmentioning

confidence: 99%

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Structure of small tropical island freshwater fish and crustacean communities: A niche‐or dispersal‐based process?

Lagarde

Teichert

Valade³

et al. 2020

Biotropica

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Determining the relative importance of niche‐ and dispersal‐based processes in the structuring of animal communities is central in ecology. Freshwater fish and crustacean communities of small tropical islands can bring new insights for understanding these processes as all their species present a pelagic larval stage which gives them important dispersal capacities. Consequently, we hypothesized that dispersal‐based process may be preponderant for structuring these communities from the regional to the local, that is, survey site, scales. Gradient forest analyses allowed us to model the effect of 12 environmental variables on freshwater taxa abundances in two southwestern Indian Ocean islands: Mayotte (26 taxa) and Reunion (21). A total of 153 surveys in Mayotte and 266 in Reunion were used for building the models. Despite the strong heterogeneity of environmental conditions between the two islands, the main factors structuring freshwater fish and crustacean communities in both islands were the elevation and the slope of the sites. The observed structure appeared more pronounced for predatory species than for primary consumers and omnivores. As predators generally have limited locomotor capacities, it is concluded that dispersal‐based process structures these communities not only at large geographical scales but also at the intra‐watershed scale, by limiting the inland penetration (or dispersion) of species in relation to their locomotor capacities. However, more knowledge concerning ecological traits and taxonomic status of many species is needed to confirm this assumption. Abstract in French is available with online material

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Section: Data Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure of small tropical island freshwater fish and crustacean communities: A niche‐or dispersal‐based process?

Lagarde

Teichert

Valade³

et al. 2020

Biotropica

View full text Add to dashboard Cite

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Variation in freshwater fish assemblages along a regional elevation gradient in the northern Andes, Colombia

Carvajal‐Quintero

Escobar

Alvarado

et al. 2015

Ecology and Evolution

101

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Studies on elevation diversity gradients have covered a large number of taxa and regions throughout the world; however, studies of freshwater fish are scarce and restricted to examining their changes along a specific gradient. These studies have reported a monotonic decrease in species richness with increasing elevation, but ignore the high taxonomic differentiation of each headwater assemblage that may generate high β-diversity among them. Here, we analyzed how fish assemblages vary with elevation among regional elevation bands, and how these changes are related to four environmental clines and to changes in the distribution, habitat use, and the morphology of fish species. Using a standardized field sampling technique, we assessed three different diversity and two structural assemblage measures across six regional elevation bands located in the northern Andes (Colombia). Each species was assigned to a functional group based on its body shape, habitat use, morphological, and/or behavioral adaptations. Additionally, at each sampling site, we measured four environmental variables. Our analyses showed: (1) After a monotonic decrease in species richness, we detected an increase in richness in the upper part of the gradient; (2) diversity patterns vary depending on the diversity measure used; (3) diversity patterns can be attributed to changes in species distribution and in the richness and proportions of functional groups along the regional elevation gradient; and (4) diversity patterns and changes in functional groups are highly correlated with variations in environmental variables, which also vary with elevation. These results suggest a novel pattern of variation in species richness with elevation: Species richness increases at the headwaters of the northern Andes owing to the cumulative number of endemic species there. This highlights the need for large-scale studies and has important implications for the aquatic conservation of the region.

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Evolutionary optimization of an anatomical suction cup: Lip collagen content and its correlation with flow and substrate in Neotropical suckermouth catfishes (Loricarioidei)

Bressman

Armbruster

Lujan

et al. 2020

Journal of Morphology

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In riverine ecosystems, downstream drag caused by fast-flowing water poses a significant challenge to rheophilic organisms. In neotropical rivers, many members of a diverse radiation of suckermouth catfishes (Loricarioidei) resist drag in part by using modified lips that form an oral suction cup composed of thick flesh. Histological composition and morphology of this cup are interspecifically highly variable. Through an examination of 23 loricarioid species, we determined that the tissue most responsible for lip fleshiness is collagen. We hypothesized that lip collagen content is interspecifically correlated with substrate and flow so that fishes living on rocky substrates in high-flow environments have the largest, most collagenous lips. By mapping the amount and distribution of lip collagen onto a phylogeny and conducting ANOVA tests, we found support for this hypothesis. Moreover, these traits evolved multiple times in correlation with substrate and flow, suggesting they are an effective means for improving suction-based attachment. We hypothesize that collagen functions to reinforce oral suction cups, reducing the likelihood of slipping, buckling, and failure under high-flow, high-drag conditions. Macroevolutionary patterns among loricarioid catfishes suggest that for maximum performance, biomimetic suction cups should vary in material density according to drag and substrate requirements.

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Climbing behavior of Cordylancistrus sp. in the Colombian Andes

Cited by 10 publications

References 25 publications

Structure of small tropical island freshwater fish and crustacean communities: A niche‐or dispersal‐based process?

Structure of small tropical island freshwater fish and crustacean communities: A niche‐or dispersal‐based process?

Variation in freshwater fish assemblages along a regional elevation gradient in the northern Andes, Colombia

Evolutionary optimization of an anatomical suction cup: Lip collagen content and its correlation with flow and substrate in Neotropical suckermouth catfishes (Loricarioidei)

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