Dietary niche partitioning in sympatric gadid species in coastal Newfoundland: evidence from stomachs and C-N isotopes

Knickle, D. Craig; Rose, George A.

doi:10.1007/s10641-013-0156-0

Cited by 32 publications

(41 citation statements)

References 44 publications

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“…Other studies from coastal Newfoundland have shown that older (age 2-4) juvenile G. morhua were typically associated with macroalgae and/or coarse substrates [11,[13][14][15][16]. Large (> 60 cm) cod are known to prey on smaller conspecifics as well as G. ogac [8,37,38], and were observed acoustically and caught by angling in close proximity to the study area. Hence, selection by both young gadids for complex substrates is consistent with an anti-predator strategy.…”

Section: Habitat Usementioning

confidence: 85%

“…Dietary overlap between juvenile G. morhua and G. ogac does occur, with both species feeding on organisms typically associated with inshore macroalgae beds such as polychaetes and benthic fish (e.g., shannys; Stichaeidae) [5,40]. Nevertheless, there are key differences is the diets of these gadids [8,37] which might be expected to lead to different habitat use patterns if food is the key factor. The more benthic habits of G. ogac may be related to the more benthic diet of this species in comparison to the more pelagic behaviour of G. morhua.…”

Section: Habitat Usementioning

confidence: 99%

“…We further suggest that even a small segregation along the vertical habitat dimension may assist coexistence between these two species and that this pattern is likely a component of differences in foraging behaviour. G. morhua tends to have a higher proportion of pelagic food items [8,37] and a more pelagic stable isotope signature than does G. ogac [8].…”

Section: Vertical Distributionmentioning

confidence: 99%

“…Recent studies suggest that sympatry of these species is facilitated primarily through partitioning of food resources, with G. morhua pursuing more pelagic prey [8] and to a lesser extent by differences in activity patterns [9]. However, microhabitat partitioning could also be an enabler of sympatry but has not been studied in these species.…”

Section: Introductionmentioning

confidence: 99%

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Microhabitat Use and Vertical Habitat Partitioning of Juvenile Atlantic (Gadus morhua) and Greenland (Gadus ogac) Cod in Coastal Newfoundland

Knickle¹,

Rose²

2014

TOFISHSJ

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Twenty co-occurring juvenile gadids (10 Gadus ogac and 10 Gadus morhua) were surgically implanted with ultrasonic transmitters with depth sensors and continuously monitored for up to 23 days in the summers of 2009 and 2010 to test fine-scale habitat use and vertical distribution overlap in coastal Newfoundland (>18700 positional fixes). A habitat map with 8 substrate and 3 slope classes (low (<5°), moderate (5-10°), and high (>10°)) was generated from acoustic data and coincident video data using seabed mapping software (QTC). Fish locations were integrated with a habitat map to assess and quantify habitat preference. Both species avoided fine gravel/sand substrates with little vegetation and selected for large particle (cobble and boulder) substrates with moderate or dense vegetation, and spent the majority of time in < 10 m of water. Nevertheless, species differences in habitat use were evident. G. ogac typically remained in close proximity to the seafloor whereas G. morhua was often distributed more pelagically and showed greater variation in vertical distribution. Habitat use and vertical distribution patterns were consistent across the diel period. Our results suggest that despite high overlap in habitat use, G. morhua and G. ogac often segregate vertically in the water column, which may reduce competitive interference. We suggest that these patterns are related to differences in diet.

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Section: Habitat Usementioning

confidence: 85%

Section: Habitat Usementioning

confidence: 99%

Section: Vertical Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microhabitat Use and Vertical Habitat Partitioning of Juvenile Atlantic (Gadus morhua) and Greenland (Gadus ogac) Cod in Coastal Newfoundland

Knickle¹,

Rose²

2014

TOFISHSJ

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“…Based on the relationship between species coexistence and trophic niche partitioning in analogous extant and extinct (Purnell et al 2006(Purnell et al , 2012Polačik et al 2014;Knickle and Rose 2014), such closely related coexisting animals as have been described from the MOTH locality would be expected to have exploited different food sources. Because of the lack of direct fossil evidence such as stomach contents or coprolites, this hypothesis has not previously been tested for the MOTH ischnacanthiforms.…”

Section: Introductionmentioning

confidence: 99%

Precise occlusion and trophic niche differentiation indicate specialized feeding in Early Devonian jawed vertebrates

Blais

2017

FACETS

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Acanthodians may represent a paraphyletic assemblage of stem chondrichthyans, stem osteichthyans, stem gnathostomes, or some combination of the three. One of the difficulties in determining the phylogenetic affinities of this group of mostly small, spiny fishes is that several subgroups of acanthodians are represented by relatively little information in the fossil record. It is becoming increasingly apparent that to understand the evolution of gnathostomes, we must understand more about acanthodians. This study uses micro-computed tomography to test hypotheses about acanthodian jaw function, and in doing so provides insight into the form, function, and ecological role of ischnacanthiform acanthodian jaws and teeth from an extraordinary Early Devonian fossil locality in the Northwest Territories of Canada. The results of this study suggest that ischnacanthiform acanthodians may have coexisted by trophic niche differentiation, employing specialized feeding strategies during the Silurian and Early Devonian.

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Dietary Composition and Trophic Niche Partitioning of Spotty‐bellied Greenlings Hexagrammos agrammus, Fat Greenlings H. otakii, Korean Rockfish Sebastes schlegelii, and Japanese Seaperch Lateolabrax japonicus in the Yellow Sea Revealed by Stomach Content Analysis and Stable Isotope Analysis

Zhang

et al. 2018

Mar Coast Fish

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Stable nitrogen and carbon isotope ratios of fish tissues, in combination with stomach content analysis, provide insights into how energy flows through marine food webs. Using these techniques, we investigated the diets and trophic niches of four important fish species of the Yellow Sea: the Spotty‐bellied Greenling Hexagrammos agrammus, Fat Greenling H. otakii, Korean Rockfish Sebastes schlegelii, and Japanese Seaperch Lateolabrax japonicus. The stomach content analysis revealed that Spotty‐bellied Greenlings mainly fed on crabs and fish; Fat Greenlings mainly preyed on fish, crabs, and shrimps; Korean Rockfish primarily consumed fish and shrimps; and Japanese Seaperch mainly fed on fish. Korean Rockfish had the highest dietary breadth index among the four fish species. Dietary composition of the four species did not overlap significantly, as indicated by Schoener's index. Prey category composition varied across fish species and differed between species pairs (except Korean Rockfish and Japanese Seaperch), as suggested by permutational ANOVA tests. The stable isotope analysis suggested that Japanese Seaperch had significantly higher δ13C and δ15N and had a significantly different centroid position, both of which indicated a higher trophic position. The corrected standard ellipse area on the δ15N–δ13C (‰) biplot varied in size among species and significantly overlapped in the three rockfishes, with the largest overlap area observed between Fat Greenlings and Korean Rockfish. The results, in general, suggested that the three rockfish species, especially Korean Rockfish and Fat Greenlings, had similar trophic niches, but they were partitioned by prey resources according to the stomach content composition. Our study provides novel insights into the dietary niches and trophic dynamics of these four exploited species, which could help to improve ecosystem‐based fisheries management in the Yellow Sea.

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Dietary niche partitioning in sympatric gadid species in coastal Newfoundland: evidence from stomachs and C-N isotopes

Cited by 32 publications

References 44 publications

Microhabitat Use and Vertical Habitat Partitioning of Juvenile Atlantic (Gadus morhua) and Greenland (Gadus ogac) Cod in Coastal Newfoundland

Microhabitat Use and Vertical Habitat Partitioning of Juvenile Atlantic (Gadus morhua) and Greenland (Gadus ogac) Cod in Coastal Newfoundland

Precise occlusion and trophic niche differentiation indicate specialized feeding in Early Devonian jawed vertebrates

Dietary Composition and Trophic Niche Partitioning of Spotty‐bellied Greenlings Hexagrammos agrammus, Fat Greenlings H. otakii, Korean Rockfish Sebastes schlegelii, and Japanese Seaperch Lateolabrax japonicus in the Yellow Sea Revealed by Stomach Content Analysis and Stable Isotope Analysis

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