Chondrichthyes Diet

Crooks, Neil

doi:10.1007/978-3-319-47829-6_1009-1

Cited by 4 publications

(4 citation statements)

References 49 publications

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“…The diet also included cephalopods and crustaceans, but in less proportion than what was reported in previous studies from the north‐west Atlantic (Joyce et al ., 2002), New Zealand (Horn et al ., 2013), Kerguelen Islands (Cherel & Duhamel, 2004), south Pacific (Yatsu, 1995) or Antarctic Peninsula (Rodhouse, 2013). The other species of the genus, L. ditropis , also feeds mainly on teleost fish (Hulbert et al ., 2005; Nagasawa, 1998), and the diet of the majority of the pelagic shark species that have been investigated consisted of teleost fish, followed by cephalopods (Crooks, 2020). The porbeagle shark fed mainly on hoki M. magellanicus and the southern blue whiting M. australis , two large planktivorous fishes from the SWAO (Brickle et al ., 2009).…”

Section: Discussionmentioning

confidence: 99%

Eating catch of the day: the diet of porbeagle shark Lamna nasus (Bonnaterre 1788) based on stomach content analysis, and the interaction with trawl fisheries in the south‐western Atlantic (52° S–56° S)

Belleggia

Colonello

Cortés

et al. 2021

Journal of Fish Biology

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This work examined the diet of the porbeagle shark Lamna nasus in the south‐west Atlantic Ocean (SWAO, Argentina, 52° S–56° S) by analysing the stomach content information obtained by scientific observers who sampled specimens captured as by‐catch on‐board commercial fishing vessels from 2010 to 2020. A total of 148 fishing sites were analysed, in which the estimated catch was composed mainly of hoki Macruronus magellanicus (56.00%) and southern blue whiting Micromesistius australis (33.13%). From 413 porbeagle sharks sampled (292 females and 121 males) ranging from 71 to 241 cm total length (LT) (mean: 179.76 ± 26.74 cm), 310 (75.06%) contained food in the stomachs. The forage fish were mainly hoki M. magellanicus (23.53%) and southern blue whiting M. australis (19.05%), followed by the Patagonian sprat Sprattus fuegensis (4.48%) and nototheniids (1.4%). Cephalopods and crustaceans accounted for 10% of the diet. The estimated trophic level was 4.35. Generalized linear models revealed that the consumption of hoki M. magellanicus and southern blue whiting M. australis increased with the LT of the porbeagle shark. Moreover, smaller porbeagle sharks preyed upon both small and large teleost fish, whereas larger porbeagle sharks predated exclusively upon large fish. The diet of porbeagle shark involved interactions with fisheries as it fed upon the fish species that constituted the main catch in the analysed fishing sites, as well as the main catches of the austral trawl fisheries. The ecological role of porbeagle shark observed in the SWAO exposed implications for fisheries management from a multispecies perspective.

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Section: Discussionmentioning

confidence: 99%

Eating catch of the day: the diet of porbeagle shark Lamna nasus (Bonnaterre 1788) based on stomach content analysis, and the interaction with trawl fisheries in the south‐western Atlantic (52° S–56° S)

Belleggia

Colonello

Cortés

et al. 2021

Journal of Fish Biology

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“…44 These habitats are favored by carcharhiniforms today, especially carcharhinids, 7,44 which underwent a disparity increase across the PETM (Figure S3C), potentially reflecting an adaptive accommodation of changing prey resource availability. 45 While various developmental (e.g., palatoquadrate structure in lamniforms), 46 reproductive (e.g., mating), behavioral (e.g., foraging habits), size-related (e.g., prey-size, body-size, and gape), 35,43 and environmental (e.g., prey availability) 40 constraints have influenced the evolution of shark dentitions, the primary function of their teeth is to capture and process prey, suggesting a link between tooth morphology and diet. 14,38 Concomitantly, we evince a significant association between piscivory and mesiodistally compressed cuspidate anterior teeth (Figures 4C, 4D, and S4A-S4F), such as those of the sand tiger shark (Carcharias taurus), as well as with elongate ''needlelike'' teeth exemplified by Mitsukurina owstoni.…”

Section: Ll Open Accessmentioning

confidence: 99%

Feeding ecology has shaped the evolution of modern sharks

et al. 2021

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“…38 While this may be true for species like the modern Galeocerdo cuvier (OBD = 0.86), most selachimorphs display varying degrees of dietary specialization (Figure 5). 39,40 Approximately 85% (47 out of 55) of extant lamniform and carcharhiniform species that we analyzed have ODBs <0.5 (Figures 5A-5C), indicating a tendency toward more selective feeding. Unfortunately, without direct evidence from preserved gut contents, 41 ODBs cannot be estimated for fossil sharks.…”

Section: Ll Open Accessmentioning

confidence: 99%

Feeding Ecology Has Shaped the Evolution of Modern Sharks

Bazzi

Campione²,

Kear

et al. 2021

SSRN Journal

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Sharks are iconic predators in today's oceans, yet their modern diversity has ancient origins. In particular, present hypotheses suggest that a combination of mass extinction, global climate change, and competition has regulated the community structure of dominant mackerel (Lamniformes) and ground (Carcharhiniformes) sharks over the last 66 million years. However, while these scenarios advocate an interplay of major abiotic and biotic events, the precise drivers remain obscure. Here, we focus on the role of feeding ecology using a geometric morphometric analysis of 3,837 fossil and extant shark teeth. Our results reveal that morphological segregation rather than competition has characterized lamniform and carcharhiniform evolution. Moreover, although lamniforms suffered a long-term disparity decline potentially linked to dietary "specialization," their recent disparity rivals that of "generalist" carcharhiniforms. We further confirm that low eustatic sea levels impacted lamniform disparity across the end-Cretaceous mass extinction. Adaptations to changing prey availability and the proliferation of coral reef habitats during the Paleogene also likely facilitated carcharhiniform dispersals and cladogenesis, underpinning their current taxonomic dominance. Ultimately, we posit that trophic partitioning and resource utilization shaped past shark ecology and represent critical determinants for their future species survivorship.

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Chondrichthyes Diet

Cited by 4 publications

References 49 publications

Eating catch of the day: the diet of porbeagle shark Lamna nasus (Bonnaterre 1788) based on stomach content analysis, and the interaction with trawl fisheries in the south‐western Atlantic (52° S–56° S)

Eating catch of the day: the diet of porbeagle shark Lamna nasus (Bonnaterre 1788) based on stomach content analysis, and the interaction with trawl fisheries in the south‐western Atlantic (52° S–56° S)

Feeding ecology has shaped the evolution of modern sharks

Feeding Ecology Has Shaped the Evolution of Modern Sharks

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