Spatial and temporal changes in buccal pressure during prey-capture in the trumpetfish (Aulostomus maculatus)

Tegge, Samuel; Hall, Jason F.; Huskey, Steve

doi:10.1007/s00435-019-00470-4

Cited by 5 publications

(5 citation statements)

References 54 publications

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“…While frogfish rely on extremely large rotation of the cranial-most intervertebral joints ( figure 4 ), in other species with large and fast cranial elevation the first 1–4 vertebrae are actually fused to the neurocranium, e.g. Luciocephalus pulcher [ 28 ] and Aulostomus maculatus [ 29 ]. One function of these fused vertebrae may be to resist the high forces resulting from epaxial muscles acting on the neurocranium during powerful cranial elevation, while dorsoventral rotation occurs over more caudal joints .…”

Section: Discussionmentioning

confidence: 99%

A neck-like vertebral motion in fish

Camp

2021

Proc. R. Soc. B.

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Tetrapods use their neck to move the head three-dimensionally, relative to the body and limbs. Fish lack this anatomical neck, yet during feeding many species elevate (dorsally rotate) the head relative to the body. Cranial elevation is hypothesized to result from the craniovertebral and cranial-most intervertebral joints acting as a neck, by dorsally rotating (extending). However, this has never been tested due to the difficulty of visualizing and measuring vertebral motion in vivo . I used X-ray reconstruction of moving morphology to measure three-dimensional vertebral kinematics in rainbow trout ( Oncorhynchus mykiss ) and Commerson's frogfish ( Antennarius commerson ) during feeding. Despite dramatically different morphologies, in both species dorsoventral rotations extended far beyond the craniovertebral and cranial intervertebral joints. Trout combine small (most less than 3°) dorsal rotations over up to a third of their intervertebral joints to elevate the neurocranium. Frogfish use extremely large (often 20–30°) rotations of the craniovertebral and first intervertebral joint, but smaller rotations occurred across two-thirds of the vertebral column during cranial elevation. Unlike tetrapods, fish rotate large regions of the vertebral column to rotate the head. This suggests both cranial and more caudal vertebrae should be considered to understand how non-tetrapods control motion at the head–body interface.

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Section: Discussionmentioning

confidence: 99%

A neck-like vertebral motion in fish

Camp

2021

Proc. R. Soc. B.

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“…Sphyraena barracuda (TL = 4.50 and positive PC1 axis) is a large predator that has a strong bite and uses the rapid acceleration of its body to capture its prey (Grubich et al ., 2008). Similar behaviour has been observed in hunting and capture tactics in trumpetfish (order Syngnathiformes, TL = 4.43–4.50) (Auster, 2008; Tegge et al ., 2020).…”

Section: Discussionmentioning

confidence: 99%

Community‐scale relationships between body shape and trophic ecology in tropical demersal marine fish of northeast Brazil

Reis-Júnior

Bertrand

Frédou

et al. 2023

Journal of Fish Biology

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Functional morphology investigates the relationships between morphological characters and external factors, such as environmental, physical and ecological features.Here, we evaluate the functional relationships between body shape and trophic ecology of a tropical demersal marine fish community using geometric morphometrics techniques and modelling, hypothesizing that shape variables could partially explain fish trophic level. Fish were collected over the continental shelf of northeast Brazil (4-9 S). Analysed fish were distributed into 14 orders, 34 families and 72 species. Each individual was photographed in lateral view, and 18 landmarks were distributed along the body. A principal component analysis (PCA) applied on morphometric indices revealed that fish body elongation and fin base shape were the main axes of variation explaining the morphology. Low trophic levels (herbivore and omnivore) are characterized by deep bodies and longer dorsal and anal fin bases, while predators present elongated bodies and narrow fin bases. Fin position (dorsal and anal fins) on the fish body is another important factor contributing to (i) body stability at high velocity (top predators) or (ii) manoeuvrability (low trophic levels). Using multiple linear regression, we verified that 46% of trophic level variability could be explained by morphometric variables, with trophic level increasing with body elongation and size. Interestingly, intermediate trophic categories (e.g., low predators) presented morphological divergence for a given trophic level. Our results, which can likely be expanded to other tropical and nontropical systems, show that morphometric approaches can provide important insights into fish functional characteristics, especially in trophic ecology.

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“…The intraoral pressure cannula only provides pressure readings at one location within the buccal cavity and does not capture variations in pressure during suction feeding (Muller et al, 1982; Van Wassenbergh, 2015). These estimates are likely underestimates of subambient pressure, since modeling of clariid catfishes and bluegill sunfish (Van Wassenbergh et al, 2015) and in vivo measurements (Tegge et al, 2020) suggested that highest subambient pressure occurred more caudally in the buccal cavity (Van Wassenbergh et al, 2005; Van Wassenbergh et al, 2006b). Additionally, our power calculations do not account for the forces required to overcome inertia or drag (Van Wassenbergh et al, 2015), yet studies of clariid catfishes and largemouth bass indicate that these forces are likely small compared to that required to overcome subambient pressure (Van Wassenbergh et al, 2005; Van Wassenbergh et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

Section: Power Calculationsmentioning

confidence: 99%

Royal knifefish generate powerful suction feeding through large neurocranial elevation and high epaxial muscle power

Kaczmarek

Olsen

et al. 2022

Preprint

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Suction feeding in ray-finned fishes involves powerful buccal cavity expansion to accelerate water and food into the mouth. Previous XROMM studies in largemouth bass (Micropterus salmoides), bluegill sunfish (Lepomis macrochirus), and channel catfish (Ictalurus punctatus) have shown that more than 90% of suction power in high performance strikes comes from the axial musculature, with cranial muscles primarily acting to transmit power and control cranial kinematics. Royal knifefish (Chitala blanci) have an unusual hump-like appearance, a product of a curved vertebral column and a large mass of epaxial muscle. Based on their body shape, we hypothesized that royal knifefish would generate high power strikes by utilizing large neurocranial elevation, vertebral column extension, and epaxial shortening. As predicted, C. blanci generated high suction expansion power compared to the other three species studied to date (up to 160 W), which was achieved by increasing both the rate of volume change and the intraoral subambient pressure. Such increases are likely a product of its large epaxial muscle (25% of body mass) shortening at high velocities to produce large neurocranial elevation (18-28 deg) and vertebral flexion, as well as high muscle mass-specific power (up to 800 W kg-1). For the highest power strikes, axial muscles generated 99% of the power, and 60% of the axial muscle mass consisted of the epaxial muscles. This supports our hypothesis that postcranial morphology may be a strong predictor of suction feeding biomechanics.

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Spatial and temporal changes in buccal pressure during prey-capture in the trumpetfish (Aulostomus maculatus)

Cited by 5 publications

References 54 publications

A neck-like vertebral motion in fish

A neck-like vertebral motion in fish

Community‐scale relationships between body shape and trophic ecology in tropical demersal marine fish of northeast Brazil

Royal knifefish generate powerful suction feeding through large neurocranial elevation and high epaxial muscle power

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