Food resource partitioning of the Mustelus lunulatus and Mustelus henlei (Elasmobranchii: Carcharhiniformes)

Amariles, Diego F.; Navia, Andrés F.; Giraldo, Alan

doi:10.1007/s10641-017-0598-x

Cited by 16 publications

(11 citation statements)

References 53 publications

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“…Importantly, the MBD analyses show evidence of a negative diversity-dependence on extinction for small carcharhiniforms and a potential weak effect of negative diversity dependence on speciation for all three ecological classes of carcharhiniforms. This is in line with the globally increasing taxonomic diversity of these ecological groups in the recent past, especially small carcharhiniforms, and is supported by evidence of niche partitioning observed in living members of this order [113][114][115] .…”

Section: Discussionsupporting

confidence: 83%

Combining palaeontological and neontological data shows a delayed diversification burst of carcharhiniform sharks likely mediated by environmental change

Brée

Condamine

Guinot

2022

Preprint

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Estimating deep-time species-level diversification processes remains challenging. Both the fossil record and molecular phylogenies allow estimating speciation and extinction rates, but each type of data may still provide an incomplete picture of diversification dynamics. Here, we combine species-level palaeontological (fossil occurrences) and neontological (molecular phylogenies) data to estimate deep-time diversity dynamics through process-based birth-death models for Carcharhiniformes, the most speciose shark order today. Despite their abundant fossil record dating back to the Middle Jurassic, only a small fraction of extant carcharhiniform species is recorded as fossils, which impedes relying only on the fossil record to study their recent diversification. Combining fossil and phylogenetic data, we recover a complex evolutionary history for carcharhiniforms, exemplified by several variations in diversification rates with an early low diversity period followed by a Cenozoic radiation. We further reveal a burst of diversification in the last 30 million years, which is partially recorded with fossil data only. We also find that reef expansion and temperature change can explain variations in speciation and extinction through time. These results pinpoint the primordial importance of these environmental variables in the evolution of marine clades. Our study also highlights the benefit of combining the fossil record with phylogenetic data to address macroevolutionary questions.

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Section: Discussionsupporting

confidence: 83%

Combining palaeontological and neontological data shows a delayed diversification burst of carcharhiniform sharks likely mediated by environmental change

Brée

Condamine

Guinot

2022

Preprint

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“…www.nature.com/scientificreports/ Although the mean trophic position of both species was overall lower than previous results for maturing specimens of Mustelus spp. (4.0 ± 0.3 in 64 , 3.9 and 4.3 in 65 , 4.2 ± 0.6 in 58 ), ontogenetic diet shifts are common features in sharks and mirror an increased preference toward prey at higher trophic levels 76,82,83 . The observed progressive diet shift of the two smooth-hounds, occurring with a reduction in their interspecific trophic overlap during growth, can play an important role in promoting species coexistence, as shown also in other studies 84,85 .…”

Section: Discussionmentioning

confidence: 97%

Ontogenetic trophic segregation between two threatened smooth-hound sharks in the Central Mediterranean Sea

Lorenzo

Vizzini

Signa

et al. 2020

Sci Rep

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Elasmobranchs are among the species most threatened by overfishing and a large body of evidence reports their decline around the world. As they are large predators occupying the highest levels of marine food webs, their removal can alter the trophic web dynamic through predatory release effects and trophic cascade. Suitable management of threatened shark species requires a good understanding of their behaviour and feeding ecology. In this study we provide one of the first assessments of the trophic ecology of the "vulnerable" smooth-hounds Mustelus mustelus and M. punctulatus in the central Mediterranean Sea, based on stomach contents and stable isotope analyses. ontogenetic diet changes were addressed by comparing the feeding habits of three groups of individuals: juveniles, maturing and adults. our results highlighted that the two species share a similar diet based mostly on the consumption of benthic crustaceans (e.g. hermit crabs). their trophic level increases during ontogeny, with adults increasing their consumption of large-sized crustaceans (e.g. Calappa granulata, Palinurus elephas), cephalopods (e.g. Octopus vulgaris) and fish (e.g. Trachurus trachurus). our results provide also evidence of ontogenetic shifts in diet for both species showing a progressive reduction of interspecific trophic overlap during growth. The results of this study contribute to improve the current knowledge on the trophic ecology of these two threatened sharks in the Strait of Sicily, thus providing a better understanding of their role in the food web. Elasmobranch species are commonly recognized to be important predators in the marine realm 1 and play a crucial role in regulating marine ecosystems 2,3. Greater awareness of the trophic ecology of sharks can provide important information about the role they play during their life cycles and improve understanding of marine communities' structure and functioning. Many decades of severe human impacts have led to a rapid decline of many elasmobranch species around the world 4,5 , exacerbated by their biological vulnerability (e.g. slow growth rate, low fecundity, and late age at maturity) 2,5. As a consequence, many shark species are now registered by the IUCN as threatened or endangered 6. It has been shown that the decline of elasmobranch species has had marked ecological consequences 7,8. The loss of predators may negatively alter the food chain, triggering new interactions among species and marine ecosystem degradation 9. Therefore, improved knowledge about the elasmobranch trophic ecology, including the prey consumed, trophic level, ontogenetic diet changes, especially in the Mediterranean species, can play a crucial role in the development of new fishery management strategies. In fact, resource partitioning is one of the main processes for the coexistence of species 10. Partitioning, which has been observed in several organisms 12−14 , can occur along the space, time, or feeding niche axes 11 , during the same or at different

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“…In contrast to juveniles belonging to size groups 1 and 2, pompano within size group 3, represented exclusively by T. goodei , displayed little dietary overlap with T. carolinus juveniles (Figure 8), while also recording the lowest vacuity values. These findings suggest that the significant size difference detected between the evaluated Trachinotus species may be important to avoid competitive exclusion amongst congeners, as previously reported for other marine species (Schückel et al ., 2012; Amariles et al ., 2017; Vasconcellos et al ., 2018).…”

Section: Discussionmentioning

confidence: 99%

The influence of size on the trophic interactions between juveniles of two syntopic Trachinotus species

Souza

Santos

2020

J. Mar. Biol. Ass.

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Abstract Syntopic species with similar anatomic configuration may face strong competition for trophic resources, thus relying on developed mechanisms to ensure coexistence. The present study investigated the influence of body size on trophic interactions between juveniles of two closely related fish species at three sandy beaches in south-eastern Brazil. A total of 150 fish were sampled, where 103 were identified as Trachinotus carolinus (mean ± SE: weight = 9 g ± 1.13) and 47 as Trachinotus goodei (weight = 46.7 g ± 3.34). A significant size-difference between juvenile Trachinotus was detected by a null-model analysis (P = 0.04), with T. carolinus (TL = 79.6 mm ± 2.4) presenting a smaller body size than T. goodei (TL = 147.7 mm ± 4.2). The main prey items consumed by T. carolinus were Perna perna (IAi = 0.76) and Emerita brasiliensis (IAi = 0.18), whereas the latter was the major T. goodei dietary prey (IAi = 0.71). Both prey were correlated with larger-sized juveniles of each pompano species, whereas smaller fish shared non-preferred trophic items. Such opportunistic behaviour of smaller juveniles may account for the dietary overlap detected between the Trachinotus species (P = 0.09). Size-related dietary partitioning was observed for the largest T. goodei juveniles, which displayed only a slight overlap with T. carolinus, and between juveniles belonging to the small and medium size groups of each pompano species. Therefore, food partitioning related to pompano body size seems to be especially important for the smallest juveniles, as they present the highest vacuity (particularly T. carolinus) in the sampled beaches, suggesting that these individuals are under intra- and interspecific competitive pressure, which may affect local coexistence.

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Food resource partitioning of the Mustelus lunulatus and Mustelus henlei (Elasmobranchii: Carcharhiniformes)

Cited by 16 publications

References 53 publications

Combining palaeontological and neontological data shows a delayed diversification burst of carcharhiniform sharks likely mediated by environmental change

Combining palaeontological and neontological data shows a delayed diversification burst of carcharhiniform sharks likely mediated by environmental change

Ontogenetic trophic segregation between two threatened smooth-hound sharks in the Central Mediterranean Sea

The influence of size on the trophic interactions between juveniles of two syntopic Trachinotus species

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