How many trophic roles can elasmobranchs play in a marine tropical network?

Navia, Andrés F.; Mejía‐Falla, Paola A.; López-García, Juliana; Giraldo, Alan; Cruz-Escalona, Víctor Hugo

doi:10.1071/mf16161

Cited by 55 publications

(56 citation statements)

References 65 publications

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“…mesopredators) in marine ecosystems (Cortés 1999, Barría et al 2015, Navia et al 2017. Though there have been several studies on elasmobranchs in recent decades (Field et al 2009, Navia et al 2017, few have focused on interactions among sympatric species, an important element for understanding how species that appear to be ecologically similar might coexist (e.g. Albo-Puigserver et al 2015, Barría et al 2015, Navia et al 2017.…”

Section: Introductionmentioning

confidence: 99%

“…Though there have been several studies on elasmobranchs in recent decades (Field et al 2009, Navia et al 2017, few have focused on interactions among sympatric species, an important element for understanding how species that appear to be ecologically similar might coexist (e.g. Albo-Puigserver et al 2015, Barría et al 2015, Navia et al 2017. The principle of competitive exclusion predicts that predators that occupy similar niches will diverge ecologically or perhaps be displaced (Pianka 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Papastamatiou et al 2006, Barría et al 2015, Navia et al 2017. Among marine predators, some sharks and batoids can be important top predators (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Comparative diets of sympatric batoid elasmobranchs in the Gulf of Oman

Rastgoo¹,

Navarro²,

Valinassab³

2018

Aquat. Biol.

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Documenting the interactions and mechanisms of coexistence among predators is important for understanding their ecological roles in food webs. Here, we examined the diet and trophic relationships of 6 demersal batoids coexisting in the Gulf of Oman by analyzing stomach contents. There were significant differences in diets among the batoid species, suggesting differential preferences. Diets of Gymnura poecilura and Torpedo sinuspersici were similar and consisted mostly of teleost fishes. In contrast, Brevitrygon walga and Rhinobatos punctifer mostly ate crustaceans. The diets of Maculabatis randalli and Pastinachus sephen were diverse and included crustaceans, teleosts, polychaetes, bivalves and echinoderms. The differences in diet among these batoids may be related to morphological differences in feeding structures and to differences in behavior, which could explain their diversity and coexistence in the Gulf of Oman.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative diets of sympatric batoid elasmobranchs in the Gulf of Oman

Rastgoo¹,

Navarro²,

Valinassab³

2018

Aquat. Biol.

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“…Elasmobranchs (sharks and rays) are essential components of marine food webs as both predators and prey (Navia et al. ). Additionally, these species are an important food source in some countries (Davidson et al.…”

Section: Study Sitementioning

confidence: 99%

Performance of Two Survey Gears Targeting Elasmobranchs in a Shallow, Subtropical Estuary

2020

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Fishery‐independent surveys have become increasingly prevalent in recent decades for monitoring the population trends of highly mobile species like elasmobranchs (sharks and rays). Despite the utility of gear evaluations for streamlining costs and increasing the efficiency of fishery‐independent surveys, these assessments are sparse for elasmobranch‐specific surveys. Catch data were examined from a fishery‐independent longline and gill‐net survey that targeted elasmobranchs in Florida's southern Indian River Lagoon from July 2016 to September 2018. The goal of the study was to assess the effects of the type of longline bait that is used (Striped Mullet Mugil cephalus versus Atlantic Mackerel Scomber scombrus) and the size of gill‐net mesh (15.2‐ versus 20.3‐cm stretch mesh) on the species composition, catch per unit effort (CPUE), and size distribution of captured elasmobranchs. Elasmobranchs were caught more often in the gill net than on the longline. Striped Mullet yielded a significantly higher CPUE of elasmobranchs than Atlantic Mackerel did. Although Striped Mullet caught more sharks than Atlantic Mackerel did, the mean length of the sharks did not differ between groups that were captured with the two bait types. Species composition differed with respect to bait type; significantly more Bull Sharks Carcharhinus leucas and Atlantic Sharpnose Sharks Rhizoprionodon terraenovae were caught with Striped Mullet. Elasmobranch abundances were similar between the two sizes of gill‐net mesh. However, species composition differed, with a greater abundance of both Atlantic Stingrays Hypanus sabinus and Bull Sharks caught in the 15.2‐cm mesh. Elasmobranchs that were caught in the 20.3‐cm mesh were significantly larger than those caught in the 15.2‐cm mesh. The length distributions for the common species (Bull Sharks, Atlantic Stingrays, and Bluntnose Stingrays H. say) differed significantly with respect to the two mesh sizes. This study is the first assessment of a standardized elasmobranch‐specific survey in this nationally significant estuary and increases our understanding of the performance of complementary gear types for targeting sharks and rays in a shallow lagoonal system.

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“…Intermediate effects of mesopredators on aquatic systems are largely unknown and often grouped within many ecosystem types such as intertidal, pelagic, and reef (Hatton et al, 2015). Elasmobranchs and other fishes are known to feed at different trophic levels based on stage of maturity, where they exhibit high functional redundancy as mesopredators and limited redundancy as apex (Navia et al, 2017). Thus, assigning a single ecological role to a species is limiting and can affect the predictive nature of model capability.…”

Section: Controlling Forces In Trophodynamicsmentioning

confidence: 99%

Trophodynamics as a Tool for Understanding Coral Reef Ecosystems

et al. 2018

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The increased frequency of publications concerning trophic ecology of coral reefs suggests a degree of interest in the role species and functional groups play in energy flow within these systems. Coral reef ecosystems are particularly complex, however, and assignment of trophic positions requires precise knowledge of mechanisms driving food webs and population dynamics. Competent analytical tools and empirical analysis are integral to defining ecosystem processes and avoiding misinterpretation of results. Here we examine the contribution of trophodynamics to informing ecological roles and understanding of coral reef ecology. Applied trophic studies of coral reefs were used to identify recent trends in methodology and analysis. Although research is increasing, clear definitions and scaling of studies is lacking. Trophodynamic studies will require more precise spatial and temporal data collection and analysis using multiple methods to fully explore the complex interactions within coral reef ecosystems.

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How many trophic roles can elasmobranchs play in a marine tropical network?

Cited by 55 publications

References 65 publications

Comparative diets of sympatric batoid elasmobranchs in the Gulf of Oman

Comparative diets of sympatric batoid elasmobranchs in the Gulf of Oman

Performance of Two Survey Gears Targeting Elasmobranchs in a Shallow, Subtropical Estuary

Trophodynamics as a Tool for Understanding Coral Reef Ecosystems

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