Stable isotopic inferences on trophic ecology and habitat use of brown smooth-hound Mustelus henlei in the west coast of Baja California Sur, Mexico

Pantoja-Echevarría, Laura María; Tamburin, Elena; Marmolejo-Rodríguez, Ana J.; Galván‐Magaña, Felipe; Elorriaga‐Verplancken, Fernando R.; Delgado‐Huertas, Antonio; Valdéz, Arturo Tripp; Arreola-Mendoza, Laura; Lara, Ariagna

doi:10.1016/j.rsma.2020.101520

Cited by 3 publications

(4 citation statements)

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“…Due to the energetic requirements of migration (Lawson et al, 2019; Del Raye et al, 2013), and the increased predation pressure that often results (Heithaus, 2007; Heupel et al, 2007), it is unlikely that M. henlei juveniles exhibit migratory behaviour. Rather, juveniles may be subject to greater predation pressure than adults, or may travel greater distances during foraging—which may be focussed upon relatively fast‐moving prey such as teleosts (Pantoja‐Echevarría et al, 2020; Rodríguez‐Romero et al, 2013). It is also possible that the vertical movements associated with foraging behaviour which have been reported in this taxon (Rodríguez‐Romero et al, 2013) are performed only by, or more frequently by juveniles.…”

Section: Discussionmentioning

confidence: 99%

“…Suggestions of trophic specialisation are based primarily upon the dominance of certain prey types in the stomach contents of M. henlei individuals (Rodríguez‐Romero et al, 2013), however, this is not inconsistent with seasonal variation in prey availability, which may simply obscure a more opportunist ecology as recovered by other studies (Espinoza et al, 2012). There is also apparent disagreement over whether this species exhibits ontogenetic shifts in trophic ecology (Amariles et al, 2017; Pantoja‐Echevarría et al, 2020; Rodríguez‐Romero et al, 2013). Given the methodological differences between these studies, it is not possible to determine whether these conflicting results represent mere artefacts, or true ecological differences arising due to local adaptation.…”

Section: Introductionmentioning

confidence: 99%

“…upon relatively fast-moving prey such as teleosts(Pantoja-Echevarría et al, 2020;Rodríguez-Romero et al, 2013). It is also possible thatF I G U R E 4 Linear regression plots from the female-only data set of lateral span-'LS' (a), posterior span-'PS' (b), caudal keel diameter-'KC' (c), dorsal fin length-'DL' (d), dorsal fin height-'DH' (e), lower caudal lobe-'LL' (f) and upper caudal lobe-'UL' (g) against precaudal length-PL.…”

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confidence: 99%

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Ontogenetic morphometry of the brown smoothhound sharkMustelus henleiwith implications for ecology and evolution

Gayford

Godfrey²,

Whitehead

2023

Journal of Morphology

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The central tenet of ecomorphology links ecological and morphological variation through the process of selection. Traditionally used to rationalise morphological differences between taxa, an ecomorphological approach is increasingly being utilised to study morphological differences expressed through ontogeny. Elasmobranchii (sharks, rays and skates) is one clade in which such ontogenetic shifts in body form have been reported. Such studies are limited to a relatively small proportion of total elasmobranch ecological and morphological diversity, and questions remain regarding the extent to which ecological selection are driving observed morphometric trends. In this study, we report ontogenetic growth trajectories obtained via traditional linear morphometrics from a large data set of the brown smoothhound shark (Mustelus henlei). We consider various morphological structures including the caudal, dorsal and pectoral fins, as well as several girth measurements. We use an ecomorphological approach to infer the broad ecological characteristics of this population and refine understanding of the selective forces underlying the evolution of specific morphological structures. We suggest that observed scaling trends in M. henlei are inconsistent with migratory behaviour, but do not contradict a putative trophic niche shift. We also highlight the role of predation pressure and sex‐based ecological differences in driving observed trends in morphometry, a factor which has previously been neglected when considering the evolution of body form in sharks.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Ontogenetic morphometry of the brown smoothhound sharkMustelus henleiwith implications for ecology and evolution

Gayford

Godfrey²,

Whitehead

2023

Journal of Morphology

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“…The brown smoothhound shark, Mustelus henlei (Gill, 1863) is a primarily demersal Carcharhiniform shark found along the Pacific coast of the Americas, from California to Peru (Compagno, 1984; Ebert et al, 2021). This species is heavily fished in Baja California, Mexico (Medina-Morales et al, 2020; Smith et al, 2009), which has facilitated several studies into its biology and ecology in the region (Pérez-Jiménez and Sosa-Nishizaki, 2008; Byrne and Avise, 2012; Pantoja-Echevarría et al, 2020; Gayford et al, 2023a). M. henlei has a relatively great distribution compared to other Mustelus species with which it exhibits some degree of range overlap (Chabot et al, 2015), however it appears that populations are differentiated both genetically (Chabot and Haggin, 2014; Chabot et al, 2015) and ecologically, with ontogenetic and sex-based trophic variation, and overall trophic position appearing to differ between study sites (Ruso, 1975; Espinoza et al, 2012; Rodríguez-Romero et al, 2013; Amariles et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Insights into ontogenetic scaling and morphological variation in sharks from near-term brown smooth-hound (Mustelus henlei) embryos

Gayford,

Sternes,

Seamone

et al. 2024

Preprint

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Elasmobranchs (sharks and rays) exhibit a wide range of body forms adapted to various ecological niches. Body form differs not only between species, but between life stages of individual species as a result of ontogenetic allometry. In sharks, it has been proposed that these ontogenetic shifts in body form result from shifts in trophic and/or spatial ecology (the allometric niche shift hypothesis). Alternatively, it has been suggested that ontogenetic allometry may result from intrinsic morphological constraints associated with increasing body size, e.g. to counteract shifts in form-function relationships that occur as a function of size and could compromise locomotory performance. One major limitation affecting our understanding of ontogenetic scaling in sharks is that existing studies focus on postpartum ontogeny, ignoring the period of growth that occurs prior to birth/hatching. In this study, we report ontogenetic growth trajectories from 39 near-term brown smooth hound (Mustelus henlei) embryos taken from manually collected measurements. We found that unlike most other species and later ontogenetic stages of M. henlei, these embryos predominantly grow isometrically, and appear to display relatively high levels of morphological disparity. These results provide rudimentary support for the allometric niche shift hypothesis (as in the absence of ontogenetic niche shifts isometry dominates body-form scaling) and provide important insight into early shark ontogeny and morphological/developmental evolution.

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How to stay together? Habitat use by three sympatric sharks in the western coast of Baja California Sur, Mexico

Pantoja-Echevarría

Tamburin

Elorriaga‐Verplancken

et al. 2022

Environ Sci Pollut Res

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Stable isotopic inferences on trophic ecology and habitat use of brown smooth-hound Mustelus henlei in the west coast of Baja California Sur, Mexico

Cited by 3 publications

References 48 publications

Ontogenetic morphometry of the brown smoothhound sharkMustelus henleiwith implications for ecology and evolution

Ontogenetic morphometry of the brown smoothhound sharkMustelus henleiwith implications for ecology and evolution

Insights into ontogenetic scaling and morphological variation in sharks from near-term brown smooth-hound (Mustelus henlei) embryos

How to stay together? Habitat use by three sympatric sharks in the western coast of Baja California Sur, Mexico

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