Stable isotope analysis of trophic position and terrestrial vs. marine carbon sources for juvenile Pacific salmonids in nearshore marine habitats

Romanuk, Tamara N.; Levings, C. D.

doi:10.1111/j.1365-2400.2004.00432.x

Cited by 25 publications

(24 citation statements)

References 30 publications

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“…However, the lack of information on the isotopic signatures of the food items present in the diet of M. gregaria hinders the possibility of making a more detailed analysis on the contribution of each source of carbon (terrestrial vs. marine) to the diet of each morph. The values of δ 13 C obtained for both morphs, though significantly different, were similar to those reported for benthic marine algae by France (1995;δ 13 C= -17 ± 4 ‰) and Romanuk & Levings (2005;range δ 13 C: -10 to -18‰).…”

Section: Similar Feeding Habits Of Two Morphs Of Munida Gregariasupporting

confidence: 70%

Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism

Pérez-Barros

Romero

Calcagno

et al. 2010

Rev. biol. mar. oceanogr.

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Resumen.-Munida gregaria y M. subrugosa fueron originalmente descritas como especies diferentes, pero estudios recientes evidenciaron que ambas especies constituyen una misma especie biológica, y por tanto son referidas como dos morfos de M. gregaria: 'gregaria' y 'subrugosa'. A pesar de su reciente sinonimia taxonómica, la ocurrencia en simpatría de dos morfos representa un caso interesante para estudiar los procesos involucrados en el mantenimiento de los mismos en la naturaleza. Nuestra hipótesis es que las diferentes morfologías de los apéndices bucales de ambos morfos pueden estar relacionadas con hábitos alimentarios diferentes. Se capturaron adultos de M. gregaria, morfos 'gregaria' y 'subrugosa', en el Canal Beagle por medio de lances epibentónicos de arrastre en noviembre de 2004. La superposición dietaria entre los morfos resultó elevada. Ambos ocuparon la misma posición en la trama trófica del Canal Beagle y mostraron los mismos hábitos alimentarios. Como depredadores, se alimentaron principalmente de crustáceos y algas, y como depositívoros ingirieron materia orgánica particulada y organismos unicelulares bentónicos. Sin embargo, la abundancia relativa de crustáceos fue más alta en los estómagos de 'subrugosa' que en los de 'gregaria', una proporción más alta de estómagos de 'gregaria' contenían más algas que los de 'subrugosa', y se encontró una mayor frecuencia de ocurrencia de presas unicelulares en la dieta de 'gregaria'. No obstante estas diferencias, este estudio no provee evidencias que respalden la existencia de un polimorfismo trófico entre los morfos de M. gregaria, al menos sobre la base del hábito alimentario de los adultos. Palabras clave: cangrejos, langostillas, especiación, Atlántico sudoccidentalAbstract.-Munida gregaria and M. subrugosa were originally described as two different species on the basis of several morphological characters, but recent studies evidenced that both former species constitute the same biological species, so hereafter they are referred to as two morphs of M. gregaria: 'gregaria' and 'subrugosa'. Notwithstanding their synonimization, the occurrence of two sympatric morphs represents an interesting case for the study of the processes involved in the maintenance of these two morphotypes in nature. We hypothesized that the distinct shapes of mouthparts of both morphs may be related to different feeding habits. Adults of M. gregaria, morphs 'gregaria' and 'subrugosa', were collected in the Beagle Channel by epibenthic trawling during November 2004. The trophic niche of both morphs highly overlapped. Both occupied the same trophic position in the food web of the Beagle Channel, showing the same feeding habits. As predators they fed mainly on crustaceans and algae, and as deposit feeders they ingested particulate organic matter and organisms associated with the superficial layer of the sediment. However, the relative abundance of crustaceans was higher in stomachs of 'subrugosa' than in those of 'gregaria', a higher proportion of stomachs of 'gregaria' contained more...

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Section: Similar Feeding Habits Of Two Morphs Of Munida Gregariasupporting

confidence: 70%

Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism

Pérez-Barros

Romero

Calcagno

et al. 2010

Rev. biol. mar. oceanogr.

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“…where: R sample and R standard are the ratios 13 C: 12 C or 15 N: 14 N of the sample and the standard, respectively (Romanuk & Levings 2005).…”

Section: Methodsmentioning

confidence: 99%

Seasonality of energy sources of Colossoma macropomum in a floodplain lake in the Amazon – lake Camaleão, Amazonas, Brazil

Oliveira¹,

Martinelli²,

Moreira³

et al. 2006

Fisheries Management Eco

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Stomach content and stable isotopes of tambaqui, Colossoma macropomum (Cuvier), were use to determine seasonality of energy sources in a floodplain lake in the central Amazon. The turnover time of carbon in young tambaqui was fast enough to detect a broad seasonal variation both in stomach content and tissue isotopic signal of carbon and nitrogen. The relative importance of food items varied with water level. C 3 plants (seeds and fruits) contributed between 55% and 95% of the biomass fraction of tambaqui. Zooplankton contributed a minimum of 26% of the nitrogen fraction during periods of flooding, and a maximum of 67% in the dry season. C 4 plants (macrophyte leaves and roots) contributed a maximum of 26% of the biomass fraction and 13% of the N fraction mainly during the flooding period. The feeding habits and behaviour of tambaqui are complex and linked to the flood pulse. K E Y W O R D S : Amazon floodplain lakes, feeding habits, fish, stable isotopes.

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“…Terrestrial prey subsidies may also mitigate density-dependent effects. Based on stable isotope analyses, Romanuk and Levings (2005) hypothesized that terrestrial inputs promoted prey partitioning and reduced competition among multiple species of juvenile Pacific salmon in the Strait of Georgia, British Columbia. Of course, the likelihood of encountering terrestrially sourced prey decreases as juvenile salmon migrate seaward (Odum 1988).…”

Section: Formentioning

confidence: 99%

Freshwater Tidal Forests and Estuarine Wetlands May Confer Early Life Growth Advantages for Delta‐Reared Chinook Salmon

Davis

Woo

Ellings³

et al. 2019

Trans Am Fish Soc

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Large river deltas are complex ecosystems that are believed to play a pivotal role in promoting the early marine growth and survival of threatened Chinook Salmon Oncorhynchus tshawytscha. We used a fish bioenergetics model to assess the functional role of multiple delta habitats across a gradient of salinities and vegetation types, where consumption and growth rate potential (GRP) were considered as proxies for habitat quality. We subsequently compared our model output to empirical, or realized, growth estimates from scale circuli. In terms of consumption, prey energy density (EDprey) was 46–86% higher in tidal freshwater forest than in any other habitat type, while estimated consumption rates (expressed as proportion of maximum daily consumption; Pcmax) were positively correlated with FL. These size‐related differences in Pcmax led to a noticeable increase along a freshwater‐to‐saline gradient from roughly 0.25 in tidal freshwater forest to 0.55 in the offshore subtidal zone, yet despite higher observed Pcmax values in nearshore and offshore habitats, the tidal freshwater forest and emergent salt marsh demonstrated the highest modeled GRP values. Similarly, realized growth rates for fish caught in tidal freshwater forest were up to 0.5% higher per day than for fish caught in the offshore area, but habitat‐level differences were overshadowed by allometry and rearing origin. Scales from unmarked fish (assumed to be of wild origin) indicated that they grew, on average, 11% faster than did hatchery fish; however, these differences were subtle and were more obvious at fork lengths <100 mm. Our results suggest that tidal forests and emergent marshes may offer early life growth advantages for wild Chinook Salmon, but that wild and hatchery fish can compensate as they move seaward by opportunistically consuming greater quantities of low‐energy density prey, taking advantage of pulses of larval forage fish, or by spending time in multiple interconnected habitat types.

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Stable isotope analysis of trophic position and terrestrial vs. marine carbon sources for juvenile Pacific salmonids in nearshore marine habitats

Cited by 25 publications

References 30 publications

Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism

Similar feeding habits of two morphs of Munida gregaria (Decapoda) evidence the lack of trophic polymorphism

Seasonality of energy sources of Colossoma macropomum in a floodplain lake in the Amazon – lake Camaleão, Amazonas, Brazil

Freshwater Tidal Forests and Estuarine Wetlands May Confer Early Life Growth Advantages for Delta‐Reared Chinook Salmon

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