Latitudinal patterns in trophic structure of temperate reef‐associated fishes and predicted consequences of climate change

Holland, Matthew M.; Smith, James A.; Everett, Jason D.; Vergés, Adriana; Suthers, Iain M.

doi:10.1111/faf.12488

Cited by 37 publications

(44 citation statements)

References 101 publications

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“…It is likely that this positive relationship with temperature is unimodal over a greater range of temperatures, given that our surveys were conducted in early spring (Castillo et al 1996, Carroll et al 2016. Zooplanktivorous fish dominate the biomass observed around rocky reefs in this region, however their biomass generally peaks here in early autumn when water temperatures are several degrees warmer (> 20°C) (Holland et al 2020).…”

Section: Temperature As a Driver Of Fish Distributionmentioning

confidence: 95%

“…In the coldest months when temperatures are well below optimal it is possible that even minor increases in body temperature may provide substantial benefits for improved somatic growth Taggart 2007, Neuheimer et al 2011). However, in seasons when temperatures are closer to the thermal optima for specific taxa (Holland et al 2020), this balance may shift to prioritise improved foraging.…”

Section: Spatial Mismatch Of Predators and Preymentioning

confidence: 99%

“…Over broad geographic scales we know that the distribution of forage fish is highly variable (Holland et al 2020), but generally should peak in biomass in temperate regions (Sala et al 2012, Holmes et al 2013, Longo et al 2019, Holland et al 2020). However, we do not currently know about the finer scale patterns of their distribution in coastal environments.…”

Section: Introductionmentioning

confidence: 99%

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Pelagic forage fish distribution in a dynamic shelf ecosystem – Thermal demands and zooplankton prey distribution

Holland

Everett

Cox

et al. 2021

Estuarine, Coastal and Shelf Science

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The fine-scale distribution of pelagic forage fish is shaped by competing factors as fish optimise foraging while avoiding predation. We investigated the distribution of forage fish in surface waters of a dynamic coastal environment during two spring seasons to examine their distribution in relation to environmental variables. Using a multifrequency echosounder and a towed Laser Optical Plankton Counter (LOPC), we investigated the effects of bathymetry, temperature, chlorophyll a concentration and zooplankton biomass on forage fish density. Relationships between fish density and these variables were consistent between surveys, despite large differences in total acoustic energy attributed to fish. Fish density showed a strong positive relationship with bathymetry and water temperature, and no relationship with surface zooplankton biomass density or chlorophyll a. This mismatch between fish and zooplankton may be caused by differences in the way fish perceive the distribution of prey versus temperature. Despite large concentrations of zooplankton in surface waters near the coast, the topographic constraint of shallow water on fish vertical distribution may increase the risk of predation in this region. Seeking out warmer temperatures along the shelf break may also improve fish physiological performance when cooler spring temperatures are below their thermal optimum. Understanding the distribution of coastal forage fish may contribute to interpreting nearshore movements of their predators.

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Section: Temperature As a Driver Of Fish Distributionmentioning

confidence: 95%

Section: Spatial Mismatch Of Predators and Preymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pelagic forage fish distribution in a dynamic shelf ecosystem – Thermal demands and zooplankton prey distribution

Holland

Everett

Cox

et al. 2021

Estuarine, Coastal and Shelf Science

Self Cite

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“…This pathway is not always linear, but generally, fish and shellfish that feed on low trophic level species are associated with containing mainly the algal specific compounds (the less oxidized forms/lower toxic potency) [ 35 , 119 ]. Each species individual traits (e.g., home range/distances traveled, feeding mechanism [ 120 ], size, prey selection/hunting behavior [ 121 ], lifecycle [ 122 ]), and even the prey available in the season [ 123 ], determine where and how fish feed and, consequently, influence diet and ultimately fish’s CTX profile [ 124 , 125 ]. Therefore, the feeding mechanisms and unique traits for each species present an opportunity to correlate CTX congener analysis with species, behaviors, or regions (similar to using naturally occurring stable isotopes to answer many of these environmental/nutritional/biological/ecological questions).…”

Section: Introductionmentioning

confidence: 99%

“…A state shift in the coral ecosystem via loss of coral or shellfish bed structural habitat would benefit turf or macroalgae, a preferred habitat for CP producing microalgae and food source for herbivores. Additionally, climate influences the movement of animals [ 125 , 161 , 162 ], and better insight into the spaces utilized, movement, and connectivity [ 163 ] is desired to make informed decisions concerning how these changes impact the required risk management of CP and subsequent policies.…”

Section: Introductionmentioning

confidence: 99%

Ciguatera Mini Review: 21st Century Environmental Challenges and the Interdisciplinary Research Efforts Rising to Meet Them

Loeffler

Tartaglione

Friedemann

et al. 2021

IJERPH

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Globally, the livelihoods of over a billion people are affected by changes to marine ecosystems, both structurally and systematically. Resources and ecosystem services, provided by the marine environment, contribute nutrition, income, and health benefits for communities. One threat to these securities is ciguatera poisoning; worldwide, the most commonly reported non-bacterial seafood-related illness. Ciguatera is caused by the consumption of (primarily) finfish contaminated with ciguatoxins, potent neurotoxins produced by benthic single-cell microalgae. When consumed, ciguatoxins are biotransformed and can bioaccumulate throughout the food-web via complex pathways. Ciguatera-derived food insecurity is particularly extreme for small island-nations, where fear of intoxication can lead to fishing restrictions by region, species, or size. Exacerbating these complexities are anthropogenic or natural changes occurring in global marine habitats, e.g., climate change, greenhouse-gas induced physical oceanic changes, overfishing, invasive species, and even the international seafood trade. Here we provide an overview of the challenges and opportunities of the 21st century regarding the many facets of ciguatera, including the complex nature of this illness, the biological/environmental factors affecting the causative organisms, their toxins, vectors, detection methods, human-health oriented responses, and ultimately an outlook towards the future. Ciguatera research efforts face many social and environmental challenges this century. However, several future-oriented goals are within reach, including digital solutions for seafood supply chains, identifying novel compounds and methods with the potential for advanced diagnostics, treatments, and prediction capabilities. The advances described herein provide confidence that the tools are now available to answer many of the remaining questions surrounding ciguatera and therefore protection measures can become more accurate and routine.

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Automated identification of invasive rabbitfishes in underwater images from the Mediterranean Sea

Fleuré,

Magneville,

Mouillot

et al. 2024

Aquatic Conservation

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Coastal ecosystems of the Mediterranean Sea are among the richest in non‐indigenous species, mostly due to the establishment of species coming from the Red Sea through the Suez Canal. Two herbivorous rabbitfishes, Siganus rivulatus and Siganus luridus, are already invasive in the south‐eastern part of the Mediterranean Sea where they cause ecological damage by overgrazing algae. The early detection and the counting of these non‐indigenous species in the rest of the Mediterranean Sea is thus a major challenge for scientists and ecosystem managers. However, analysing images from divers or remote cameras is a demanding task. Here, a dataset of 31,285 images of Siganus spp. and of six common native fishes to the Mediterranean Sea was built from 40 underwater videos recorded at three reef habitats. A deep learning algorithm was then trained to identify Siganus spp. on images containing the eight Mediterranean species. Finally, the algorithm and a post‐processing filtering were tested with an independent dataset of 2024 images. The model had a recall of 0.92 for the Siganus genus (i.e., two Siganus species combined). After a confidence‐based post‐processing, the recall increased to 0.98 with only 4 out of 272 images of Siganus spp. being misclassified. Accuracy reached a score of 0.61 meaning that experts would have to discard false positives. Images of five native species not present in the training dataset yielded similar false positive rates than species present in the training dataset. Overall, the automatic processing of images by the model and then the checking of putative Siganus images by experts required up to five times less effort than a full processing by experts. The algorithm can help to efficiently detect these two invasive fishes in underwater images to evaluate progress towards conservation objectives and accelerate citizen‐based monitoring of coastal ecosystems.

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Latitudinal patterns in trophic structure of temperate reef‐associated fishes and predicted consequences of climate change

Cited by 37 publications

References 101 publications

Pelagic forage fish distribution in a dynamic shelf ecosystem – Thermal demands and zooplankton prey distribution

Pelagic forage fish distribution in a dynamic shelf ecosystem – Thermal demands and zooplankton prey distribution

Ciguatera Mini Review: 21st Century Environmental Challenges and the Interdisciplinary Research Efforts Rising to Meet Them

Automated identification of invasive rabbitfishes in underwater images from the Mediterranean Sea

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