Ontogenetic diet shifts in Roeboides affinis with morphological comparisons

Peterson, Christopher C.; McIntyre, P.

doi:10.1023/a:1007487326990

Cited by 24 publications

(5 citation statements)

References 29 publications

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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: 87%

“…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%

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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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Section: Introductionmentioning

confidence: 87%

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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“…Lepidophagy (scaleeating) is regarded as a derived, highly specialized dietary habit. Behavioral and morphological feeding adaptation such as specialized dentition, jaw structure, snout teeth and attack methods are found in the lepidophagous fish (Blaber, 2000;Peterson & McIntyre, 1998). The result showed that T. jarbua increasingly fed on fish scales from juvenile to adult.…”

Section: Stagementioning

confidence: 96%

“…A fish can be considered truly lepidophagous when scales are found in the stomach without bones of flesh present (Peterson & McIntyre, 1998). Lepidophagy (scaleeating) is regarded as a derived, highly specialized dietary habit.…”

Section: Stagementioning

confidence: 99%

“…These include position of mouth, mouth gape, jaw length, number of gill raker, dentition and intestinal length (Davis et al, 2012b;Davis et al, 2013;Eggold & Motta, 1992;McCormick, 1998;Mittelbach & Persson, 1998;Piet, 1998;Stoner & Livingston, 1984;Wainwright & Richard, 1995). Mouth gape has been shown as an important determinant of prey size (Mittelbach & Persson, 1998;Peterson & McIntyre, 1998). In the ontogeny of piscivory, maximum and mean prey size eaten increased with predator size in all species.…”

Section: A Introductionmentioning

confidence: 99%

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Resource utilization of terapontid fishes terapon jarbua and pelates quadrilineatus in coastal area, Trang province

Yoknoi

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Terapon jarbua and Pelates quadrilineatus are found coexisted in the coastal area of Trang Province for spawning ground, nursing ground and feeding ground. It is interesting to understand how similar species coexisted despite the pressure of competition. Resource partitioning between species or between size classes is an adaptation to reduce the competition in shared resources. The ontogenetic niche shift in term of diet and habitat is one important process in resource partitioning. Ecomorphology in fishes oftens described the patterns of association between morphology and resource use. Therefore this study had focus on (1) the development pattern and definding length at juvenile of two terapontid fishes (2) the distribution patterns of fishes in different stages and reproductive ecology of adult fish of two terapontid fishes (3) the feeding structure development and stomach content analysis in these two terapontid fishes. The understanding on morphological development and distribution as well as reproductive biology and feeding ecology of both species can help to explain the resource utilization and partitioning between the coexisting species in the coastal area of Trang Province. Terapon jarbua and Pelates quadrilineatus can be divided into 6 development stages: (1) preflexion larvae, (2) flexion larvae, (3) postflexion larvae, (4) transforming larvae, (5) juvenile (6) adult. The length-at-juvenile of T. jarbua and P. quadrilineatus were 23.16 and 18.24 mm, respectively. The size at first maturity of female and male of T. jarbua are 156.92 mm and 153.77 mm, respectively while the size at first maturity of female and male of P. quadrilineatus are 120.31 mm and 124.02 mm, respectively. Terapon jarbua and Pelates quadrilineatus showed the clear habitat utilization between developmental stages which planktonic larvae stage (preflexion, flexion and postflexion) and adult mostly inhabit in offshore. This indicated that the offshore area is the spawning ground of adult fish. However, they showed the clear differences in spawning period. Terapon jarbua had two peak of spawning periods during April to June and September to October. Pelates quadrilineatus had only a short discrete period for spawning from November to December. The differences in spawning period lead to temporal resource partitioning in planktonic larvae stage of both species. This also help to reduce food competition between their offspring. Transforming larvae and juveniles moved inshore and distributed in the coastal habitats. Transforming larvae and juveniles of T. jarbua distributed in the coastal swamps while transformation larvae and juveniles of P. quadrilineatus distributed in the seagrass beds. The complexity of microhabitat structure in the coastal swamps and seagrass beds are suitable for nursery area and refuge from predators. Terapon jarbua and Pelates quadrilineatus demonstrated the ontogenetic dietary shift. Larval stage of T. jarbua consumed predominantly on calanoid copepods and shifted to feed on small benthos harpacticoid copepods, large benthos, fishes and fish scales in juvenile stage. Adult stage feed mainly on fish and fish scales. The major food items of larval stage of P. quadrilineatus was also calanoid copepod and shifted to feed on small benthos harpacticoid copepods in juvenile stage. Adult stage feed mainly on large benthic animal such as, bivalves, polychaetes and fish scales. The ontogenetic differences in feeding habits have resulted from acquiring high energy diets for growth and development of fish. The study on morphology and feeding structure development indicated that body shape, eye, mouth, jaw, teeth, gill raker, intestinal length and fins were important characters which showed relationship between the morphological development and ontogenetic niche shifts. The morphological change in body depth and fin ray support mobility in the habitat shifts. The development of mouth, jaw, teeth, gill raker and intestinal length were important in the ontogenetic dietary shifts. The developments of eye and pigment pattern enhanced the feeding performance and predator avoidance. The differences in habitat and food utilization in the two terapontid species in each stage as well as the reproductive patterns and spawning periods are the important strategies to reduce competition between the two coexisting species in coastal area of Trang Province.

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Cleaning to corallivory: ontogenetic shifts in feeding ecology of tubelip wrasse

Cole

2009

Coral Reefs

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Ontogenetic diet shifts in Roeboides affinis with morphological comparisons

Cited by 24 publications

References 29 publications

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

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

Resource utilization of terapontid fishes terapon jarbua and pelates quadrilineatus in coastal area, Trang province

Cleaning to corallivory: ontogenetic shifts in feeding ecology of tubelip wrasse

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