Ontogenic diet shifts and scale-eating in Roeboides dayi, a Neotropical characid

Peterson, Christopher C.; Winemiller, Kirk O.

doi:10.1023/a:1007353425275

Cited by 33 publications

(8 citation statements)

References 18 publications

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“…An analysis of gut contents of several piscivorous fishes from Venezuelan rivers indicated that predator mouth gape, prey size and prey abundance all influenced size distributions of consumed prey [51]. However, there are cases in which piscivore size and prey size are uncorrelated, for example species that feed on scales, fins or mucus of other fishes [52,53]. None of the piscivorous fishes in our dataset have been reported to exhibit these feeding strategies [40].…”

Section: Discussionmentioning

confidence: 99%

Body size–trophic position relationships among fishes of the lower Mekong basin

Montaña

Winemiller

2017

R. Soc. open sci.

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Body size is frequently claimed to be a major determinant of animal trophic interactions, yet few studies have explored relationships between body size and trophic interactions in rivers, especially within the tropics. We examined relationships between body size and trophic position (TP) within fish assemblages in four lowland rivers of the Lower Mekong Basin in Cambodia. Stable isotope analysis (based on δ15N) was used to estimate TP of common fish species in each river, and species were classified according to occupation of benthic versus pelagic habitats and major feeding guilds. Regression analysis yielded strong correlations between body size and TP among fishes from the Sesan and Sreprok rivers, but not those from the Mekong and Sekong rivers. The Mekong fish assemblage had higher average TP compared with those of other rivers. The relationship between body size and TP was positive and significantly correlated for piscivores and omnivores, but not for detritivores and insectivores. The body size–TP relationship did not differ between pelagic and benthic fishes. Body size significantly predicted TP within the orders Siluriformes and Perciformes, but not for Cypriniformes, the most species-rich and ecologically diverse order in the Lower Mekong River. We conclude that for species-rich, tropical fish assemblages with many detritivores and invertivores, body size would not be an appropriate surrogate for TP in food web models and other ecological applications.

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Section: Discussionmentioning

confidence: 99%

Body size–trophic position relationships among fishes of the lower Mekong basin

Montaña

Winemiller

2017

R. Soc. open sci.

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“…This hypothesis is supported by the fact that 2 characid species of scale-eaters (Probolodus heterostomus and Exodon paradoxus) are closely related to the aggressive Astyanax tetras (Sazima 1983;Kolmann et al 2018); a similar argument can be made for the scale-eating piranha (Catoprion mento) (Janovetz 2005). Furthermore, Roeboides species facultatively ingest scales during the low-water season when competition for insects is high (Peterson and Winemiller 1997;Peterson and McIntyre 1998). It is thus also possible that increased competition for food resources led to increased aggression and lepidophagy.…”

Section: Introductionmentioning

confidence: 85%

“…Alternatively, aggression may be increased in specialists due to competition for food. For example, species of Roeboides turn to scale-eating during low-water seasons when competition for insects rises (Peterson and Winemiller 1997;Peterson and McIntyre 1998). However, pupfish inhabit hypersaline lakes connected to the ocean which do not experience seasonal fluctuations in water levels (Hagey and Mylroie 1995).…”

Section: Increased Aggression Due To Specializationmentioning

confidence: 99%

The behavioral origins of novelty: did increased aggression lead to scale-eating in pupfishes?

2019

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Behavioral changes in a new environment are often assumed to precede the origins of evolutionary novelties. Here, we examined whether an increase in aggression is associated with a novel scale-eating trophic niche within a recent radiation of Cyprinodon pupfishes endemic to San Salvador Island, Bahamas. We measured aggression using multiple behavioral assays and used transcriptomic analyses to identify differentially expressed genes in aggression and other behavioral pathways across 3 sympatric species in the San Salvador radiation (generalist, snail-eating specialist, and scale-eating specialist) and 2 generalist outgroups. Surprisingly, we found increased behavioral aggression and differential expression of aggression-related pathways in both the scale-eating and snail-eating specialists, despite their independent evolutionary origins. Increased behavioral aggression varied across both sex and stimulus context in both species. Our results indicate that aggression is not unique to scale-eating specialists. Instead, selection may increase aggression in other contexts such as niche specialization in general or mate competition. Alternatively, increased aggression may result from indirect selection on craniofacial traits, pigmentation, or metabolism-all traits which are highly divergent, exhibit signs of selective sweeps, and are affected by aggression-related genetic pathways which are differentially expressed in this system. In conclusion, the evolution of a novel predatory trophic niche within a recent adaptive radiation does not have clear-cut behavioral origins as previously assumed, highlighting the multivariate nature of adaptation and the complex integration of behavior with other phenotypic traits.

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“…It is plausible that fish consumers are expected to have more contributions from diets they prefer or from their selective foraging strategies, which are linked to morphological or physiological characteristics [57,58] as well as food availability [59,60]. However, many fish species can alter their diet opportunistically in response to the relative abundance and quality of food to maximize energy and nutritional gains relative to costs [61,62]. Dietary similarity for different species may occur in a system where food resources are abundant [63,64].…”

Section: The Influence Of Diet Strategies On the Importance Of Major mentioning

confidence: 99%

Stable Isotope Analysis Reveals the Importance of Riparian Resources as Carbon Subsidies for Fish Species in the Daning River, a Tributary of the Three Gorges Reservoir, China

Deng

Liu

et al. 2018

Water

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The patterns of carbon flow in large rivers influenced by dams are still not well known. We hypothesized that spatial variation in fish assimilation of basal production sources would be affected by heterogeneity of landscape-scale hydrology within a watershed due to the impoundment. We used stable isotope analysis and Bayesian mixing models to estimate relative contributions of basal production sources to fish consumers in a tributary of the Three Gorges Reservoir (TGR) with remarkably heterogeneous habitats between the upper and lower reaches. Model estimates indicated that riparian C 3 plants were the main basal food source irrespective of reaches or feeding groups. Autochthonous algae carbon also appeared to be important as secondary carbon sources. However, the major contributive aquatic algae in the upstream were benthic algae while planktonic algae were important in the downstream, and this difference was related to their distinct hydrological characteristics. The contribution from C 4 plants was comparatively less important to all fish consumers. Our results highlighted the significance of the riparian C 3 carbon source to fish consumers in the TGR tributary and that the difference in landscape-scale characteristics was not enough to influence the pattern, which may be attributed to abundant standing stock of the riparian plants as well as hydrologic regimes in this river.

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Ontogenic diet shifts and scale-eating in Roeboides dayi, a Neotropical characid

Cited by 33 publications

References 18 publications

Body size–trophic position relationships among fishes of the lower Mekong basin

Body size–trophic position relationships among fishes of the lower Mekong basin

The behavioral origins of novelty: did increased aggression lead to scale-eating in pupfishes?

Stable Isotope Analysis Reveals the Importance of Riparian Resources as Carbon Subsidies for Fish Species in the Daning River, a Tributary of the Three Gorges Reservoir, China

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