Nutritional physiology and ecology of wildlife in a changing world

Birnie‐Gauvin, Kim; Peiman, Kathryn S.; Raubenheimer, David; Cooke, Steven J.

doi:10.1093/conphys/cox030

Cited by 100 publications

(95 citation statements)

References 215 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This study highlights a difference between long-term and short-term effects of bread feeding on fish assemblages. The following recommendations are given: Initially, restrictions to bread feeding activities could be issued in the form of guidelines and rules that allow local tour operators to supply bread strictly (i) at designated feeding sites, (ii) using appropriate food types (Murray et al, 2016;Birnie-Gauvin et al, 2017), (iii) providing limited food amounts per person and boat (Great Barrier Reef Marine Park Authority, 1994;Murray et al, 2016), and (iv) at unpredictable times (Murray et al, 2016).…”

Section: Recommendationsmentioning

confidence: 99%

To Feed or Not to Feed? Coral Reef Fish Responses to Artificial Feeding and Stakeholder Perceptions in the Aitutaki Lagoon, Cook Islands

Prinz

Story²,

Lyon³

et al. 2020

Front. Mar. Sci.

View full text Add to dashboard Cite

Feeding wild animals is a regular habit in ecotourism worldwide with poorly known consequences for ecosystem functioning. This study investigates how effective bread feeding is at attracting coral reef fish in the South Pacific, which feeding groups of fish are most attracted, and how natural foraging rates of an omnivorous and a grazingdetritivorous fish are affected. Data were collected at sites where fish are regularly fed bread by snorkellers and at comparison sites where bread was only provided for this study, within the Aitutaki lagoon (Cook Islands). The fish community was censused and foraging rates of two model species (Chaetodon auriga, Ctenochaetus striatus) were quantified one hour before, during, and an hour after feeding events. Twentyfive percent of the species present at all sites (piscivores-invertivores) were effectively attracted to bread. Overall, mean fish density was higher at tourism feeding sites than at the comparison sites. During bread feeding events, taxonomic richness decreased, compared to the hours prior and after feeding across all sites. As piscivore-invertivores were consistently attracted to bread, localized shifts in their dominance over other trophic groups may be expected if bread feeding persists, likely carrying consequences for ecosystem functioning. The effect of bread feeding events on natural foraging rates differed between the model species. C. auriga ceased foraging on natural foods to feed on bread. Although C. striatus never fed on bread, its foraging rate on epilithic algal matrices decreased during bread feeding events. This indirect non-lethal ecological consequence of bread feeding contributes a previously unanticipated example relevant to the "ecology of fear" in marine fish. Stakeholder interviews revealed that locals favor feeding to sustain tourist satisfaction, whereas tourists appreciate snorkeling regardless of feeding. This indicates an opportunity for restrictions on fish feeding with minimal drawbacks for tourism. Future research on fish metabolism and cascading effects on the reef benthos may reveal further impacts of feeding on coral reef communities.

show abstract

Section: Recommendationsmentioning

confidence: 99%

To Feed or Not to Feed? Coral Reef Fish Responses to Artificial Feeding and Stakeholder Perceptions in the Aitutaki Lagoon, Cook Islands

Prinz

Story²,

Lyon³

et al. 2020

Front. Mar. Sci.

View full text Add to dashboard Cite

show abstract

“…Other than the high consumption rate of alternative feed in captivity, it showed better weight gain and good absorption rate. Future studies of alternative development using adult as model system should measure the rate of each elements' digestibility as this can further enhance and justify the usage of each element and its composition as overall digestibility studies may be biased (Birnie‐Gauvin, Peiman, Raubenheimer, & Cooke, ). Above all, the prior knowledge on horseshoe crabs' feeding‐related biology and physiology to understand the acceptance and the feeding utilization of horseshoe crabs better.…”

Section: Resultsmentioning

confidence: 99%

Growth performance and feeding utilization of alternative feed for adult horseshoe crabs Carcinoscorpius rotundicauda kept in captivity

et al. 2020

View full text Add to dashboard Cite

The aquafeed development has been initiated for horseshoe crabs in captivity. However, much of the attentions were to the juveniles for their widely used in research. Until recently, the research had incorporated the adult horseshoe crabs. This study aims to 1) determine the best alternative feeds for adult males of Carcinoscorpius rotundicauda, 2) measure the acceptance rate of feed, and 3) feeding utilization. Three semi‐moist pellets were either developed or purchased: fish (Decapterus russeli) and cockle (Anadara granosa) pellets (A), fish pellets (B) and keropok pellets (C). Natural feeds act as control: cockle, Anadara granosa (D) and fish, D. russeli (E). The horseshoe crabs were fed daily for 5 weeks and were analysed on their feed percentage consumption, body weight changes, feeding rate (FR), absorption efficiency (AE), feeding conversion ratio (FCR) and specific growth rate (SGR). Feed A was consumed the most (56.21%) with the highest FR (1.88%). It was influenced by the pellet's hardness, where horseshoe crabs favoured softer pellets. Body weight changes, FCR and SGR also showed a similar trend of favouring alternative feed over natural feed. Alternative feeds served a better feed than the natural feed and can be an option for future natural feed replacement for adult horseshoe crabs in captivity. Alternative feed served a better diet than the natural feed and Feed B served the best feed among the three alternative feeds with good C. rotundicauda growth performance and the feed itself is cost‐wise.

show abstract

“…These essential FAs play important physiological roles, for example, DHA is important for the structure and function of cellular membranes, especially in brain tissue and retina (Sargent et al, ; Stoknes et al, ) and ARA is a precursor of eicosanoids, which act as signalling molecules or local hormones, involved in processes of inflammation and immune response and reproduction (Arts & Kohler, ; Tocher, ). Although R. brasiliensis did not show an essential FA deficiency in any tissue analysed, lower nutritional quality, potentially linked to factors such as low population size, may result in its increased vulnerability to anthropogenic influences such as fishing and pollution when compared with R. bonasus (Birnie‐Gauvin et al, ; Semeniuk et al, ).…”

Section: Discussionmentioning

confidence: 97%

Resource partitioning between two young‐of‐year cownose rays Rhinoptera bonasus and R. brasiliensis within a communal nursery inferred by trophic biomarkers

Rangel

Hussey

Gomes

et al. 2019

Journal of Fish Biology

View full text Add to dashboard Cite

Aperfeiçoamento de Pessoal de Nível Superior -Brasil (CAPES) -Finance Code 001 for the Master scholarship.Although interspecific trophic interactions plays a principal role within elasmobranch communal nurseries, little is known over variation in foraging strategies adopted by young-of-year of sympatric species. To test the hypothesis of dietary resource partitioning between batoids within a communal nursery, we investigated two cownose ray species, Rhinoptera bonasus and R. brasiliensis, which occur in heterospecific groups, a strategy predicted to increase survival and foraging success. Using two biochemical tracers, fatty acids (FA) and stable isotopes (δ 15 N and δ 13 C), the combined effects of maternal investment and the formation of heterospecific groups implying competition for, or partitioning of available food resources were investigated. Through univariate and multivariate analyses of biochemical tracers in several tissues (fin clip, muscle, liver, red blood cells; RBC) and plasma, our results revealed significant interspecific differences in tracers between the two species. Total FAs ( P saturated FA, P monounsaturated FA and P polyunsaturated FA) and trophic biomarkers (i.e., docosahexaenoic acid, arachidonic acid, oleic acid and δ 15 N) were the principle tracers responsible for the differences detected. These data revealed that R. brasiliensis was less enriched in physiologically important essential FAs than R. bonasus. Our findings suggest that these congeneric species differ in maternal investment strategy and moderately partition food resources over relatively fine spatial scales within a single nursery habitat to limit competition. These results provide further knowledge on the foraging strategies adopted by batoids in communal nursery areas, information that is required for improving spatial conservation and management planning. K E Y W O R D S elasmobranch, fatty acids, life history strategy, maternal investment, stable isotopes, trophic ecology

show abstract

Nutritional physiology and ecology of wildlife in a changing world

Cited by 100 publications

References 215 publications

To Feed or Not to Feed? Coral Reef Fish Responses to Artificial Feeding and Stakeholder Perceptions in the Aitutaki Lagoon, Cook Islands

To Feed or Not to Feed? Coral Reef Fish Responses to Artificial Feeding and Stakeholder Perceptions in the Aitutaki Lagoon, Cook Islands

Growth performance and feeding utilization of alternative feed for adult horseshoe crabs Carcinoscorpius rotundicauda kept in captivity

Resource partitioning between two young‐of‐year cownose rays Rhinoptera bonasus and R. brasiliensis within a communal nursery inferred by trophic biomarkers

Contact Info

Product

Resources

About