Trophic specializations of damselfishes are tightly associated with reef habitats and social behaviours

Gajdzik, Laura; Parmentier, Éric; Sturaro, Nicolas; Frederich, Bruno

doi:10.1007/s00227-016-3020-x

Cited by 33 publications

(51 citation statements)

References 67 publications

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“…No significant difference in δ 34 S values was observed between shark species, but both exhibited large ranges ( C. amblyrhynchos 15.4–18.6‰; C. albimarginatus 11.8–19.0‰; Table and Figure e,f). Mean δ 34 S values for reef sharks (17.0–17.5‰) suggest they are heavily dependent on pelagic productivity (Gajdzik et al, ). However, the wide ranges suggest they have diverse intraspecific feeding strategies, especially C. albimarginatus , verifying previous dietary studies (Cortés ).…”

Section: Stable–isotope (δ13c δ15n and δ34s) Values Of Different Tissupporting

confidence: 85%

Evidence for dynamic resource partitioning between two sympatric reef shark species within the British Indian Ocean Territory

Curnick

Carlisle

Gollock

et al. 2019

Journal of Fish Biology

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Stable‐isotope analyses (δ13C, δ15N and δ34S) of multiple tissues (fin, muscle, red blood cells and plasma), revealed ontogenetic shifts in resource use by grey reef sharks Carcharhinus amblyrhynchos and resource partitioning with silvertip sharks Carcharhinus albimarginatus within the British Indian Ocean Territory marine protected area (MPA). Resource partitioning varied temporally, with C. albimarginatus feeding on more pelagic prey during October to January, potentially attributable to an influx of pelagic prey from outside the MPA at that time. Reef sharks may therefore be affected by processes outside an MPA, even if the sharks do not leave the MPA.

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Section: Stable–isotope (δ13c δ15n and δ34s) Values Of Different Tissupporting

confidence: 85%

Evidence for dynamic resource partitioning between two sympatric reef shark species within the British Indian Ocean Territory

Curnick

Carlisle

Gollock

et al. 2019

Journal of Fish Biology

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“…Assessing the resource use of these two inner atoll predators solely based on δ 13 C and δ 15 N values may have missed this intricacy, as the δ 13 C and δ 15 N values were indicative of feeding on more pelagic prey from higher trophic levels (evidenced by lower δ 13 C and higher δ 15 N). In food web studies, δ 34 S is often overlooked, despite its ability to help distinguish between different marine producers (Connolly et al, ) and reveal resource usage intricacies and pathways (Croisetière et al, ; Gajdzik, Parmentier, Sturaro, & Frédérich, ) that may be masked using only δ 13 C or δ 15 N. The primary reason for this is that measuring δ 34 S is typically more challenging, and thus more costly, than measuring δ 13 C or δ 15 N. However, recent technological advances and new instruments mean that δ 13 C, δ 15 N, and δ 34 S can be measured from the same sample aliquot with a high level of precision (Fourel, Lécuyer, & Balter, ). Given these advances and the relative ease of measuring δ 34 S, we strongly suggest that more studies incorporate δ 34 S to employ the tri‐isotope ellipsoid approach that we present here.…”

Section: Discussionmentioning

confidence: 99%

Novel tri‐isotope ellipsoid approach reveals dietary variation in sympatric predators

Skinner

Mill

Newman

et al. 2019

Ecology and Evolution

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Sympatric species may partition resources to reduce competition and facilitate co‐existence. While spatial variation and specialization in feeding strategies may be prevalent among large marine predators, studies have focussed on sharks, birds, and marine mammals. We consider for the first time the isotopic niche partitioning of co‐occurring, teleost reef predators spanning multiple families. Using a novel tri‐isotope ellipsoid approach, we investigate the feeding strategies of seven of these species across an atoll seascape in the Maldives. We demonstrate substantial spatial variation in resource use of all predator populations. Furthermore, within each area, there was evidence of intraspecific variation in feeding behaviors that could not wholly be attributed to individual body size. Assessing species at the population level will mask these intraspecific differences in resource use. Knowledge of resource use is important for predicting how species will respond to environmental change and spatial variation should be considered when investigating trophic diversity.

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“…Chromis spp.) although they forage in different reef locations, fringing or barrier reefs (Gajdzik et al., ). Likewise, a partitioning of same resources on a diel temporal scale may also contribute to such similarity (Kronfeld‐Schor & Dayan, ), with an expected corollary that different species rely on the same food source, but each differs in their daily use of it.…”

Section: Discussionmentioning

confidence: 99%

“…Species from Chrominae have also the tendency to exhibit similar habitat‐behavioural requirements as well as those from Stegastinae and this could increase the detection of phylogenetic structure and conservatism (e.g. Gajdzik et al., ). In contrast to the assemblages of Madagascar and Moorea having a large number of species from Chrominae (Figures S1 and S2 in Appendix S1), the Dongsha assemblage comprises the highest proportion of Pomacentrinae (68% of species’ assemblage) and depicts a situation wherein closely related species exhibit different trophic strategies (Figure S3 in Appendix S1).…”

Section: Discussionmentioning

confidence: 99%

“…This methodology was applied on damselfish individuals from Dongsha (whole reef and lagoon) as well as on individuals from the lagoon of Madagascar and the whole reef of Moorea (comprising its lagoon), although the isotopic data of the last two coral reefs were already used in Frédérich, Fabri, Lepoint, Vandewalle, and Parmentier () and in Gajdzik, Parmentier, Sturaro, and Frédérich (), respectively.…”

Section: Methodsmentioning

confidence: 99%

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Similar levels of trophic and functional diversity within damselfish assemblages across Indo‐Pacific coral reefs

et al. 2018

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Understanding the forces that influence the dynamics of communities is a key challenge to undertake in changing environments. Despite recent advances in coral reef community ecology, a more comprehensive knowledge about processes (niche‐related traits and phylogenies) driving the composition of reef fish community is needed. Here, we conducted a quantitative comparison of these processes in damselfish assemblages that belong to three distinct Indo‐Pacific coral reefs differing in taxonomic composition, morphology and degree of human disturbance. We compiled a dataset of eight categorical variables to estimate functional diversity of damselfish assemblages and a second one of stable isotope ratios to evaluate isotopic diversity, a proxy of trophic diversity. Both datasets represent the eco‐functional diversity and provide insights into niche‐related traits. Indices were then computed to grasp complementary facets of this diversity: the size of multidimensional space (richness), the partitioning of niches (divergence) and the regularity in the distribution of niches (evenness) within each space. We also tested whether functional and trophic traits displayed some evolutionary niche conservatism. We found that functional richness was influenced by the number of species and functional entities (unique combination of trait values), and that the portions of the functional spaces filled by assemblages mainly overlapped. Functional divergence and evenness indices were similarly high. For trophic diversity, the isotopic richness remained equivalent, while the two other indices were of high values and did not significantly differ. Both functional and trophic traits did not display any phylogenetic conservatism. We demonstrated consistent levels of eco‐functional diversity in Indo‐Pacific coral reef damselfishes. Each assemblage hosted species whose niches were highly differentiated and evenly distributed in eco‐functional spaces of similar sizes, albeit the extent of functional space varied with the species richness. Assemblages also tended to share similar functional attributes. The inconsistent phylogenetic structures of eco‐functional traits and the similarity in diversity indices suggest that the assemblage composition of damselfishes is mainly driven by niche‐related processes rather than by phylogenetic relatedness. Our work helps to determine which mechanisms shape coral reef fish biodiversity and more particularly assemblages issued from replicated events of ecological radiation. A http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.13071/suppinfo is available for this article.

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Trophic specializations of damselfishes are tightly associated with reef habitats and social behaviours

Cited by 33 publications

References 67 publications

Evidence for dynamic resource partitioning between two sympatric reef shark species within the British Indian Ocean Territory

Evidence for dynamic resource partitioning between two sympatric reef shark species within the British Indian Ocean Territory

Novel tri‐isotope ellipsoid approach reveals dietary variation in sympatric predators

Similar levels of trophic and functional diversity within damselfish assemblages across Indo‐Pacific coral reefs

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