Alexia Dubuc

James Cook University

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Marcus Sheaves

James Cook University

Nathan J. Waltham

James Cook University

Ronald J. Baker

Dauphin Island Sea Lab

Cyril Marchand

University of New Caledonia

Andrea Arriaga

Universidad de Costa Rica

Luis Chasqui

José Benito Vives de Andréis Marine and Coastal Research Institute

Juan José Alvarado

Universidad de Costa Rica

Tatiana Araya‐Arce

Universidad de Costa Rica

Manuel Olán‐González

Universidad Nacional Autónoma de México

Johanna Segovia

Francisco Gavidia University

Cooperative Institutions

James Cook University

University of Western Australia

ARC Centre of Excellence for Coral Reef Studies

Australian Institute of Marine Science

Australian Research Council

Western Australian Marine Science Institution

Universidad Autónoma de Baja California Sur

Universidad Autónoma de Baja California

Ecological Society of America

Universidad de Guadalajara

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Author response for "Patterns of reef fish taxonomic and functional diversity in the Eastern Tropical Pacific"

Alexia Dubuc Juan P. Quimbayo Juan José Alvarado Tatiana Araya‐Arce Andrea Arriaga

Tropical marine climate

Tropical Eastern Pacific

10.1111/ecog.06536/v3/response1

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Consequences for nekton of the nature, dynamics, and ecological functioning of tropical tidally dominated ecosystems

Estuarine Coastal and Shelf Science (2024)

Marcus Sheaves Ronald J. Baker Kátya G. Abrantes Adam Barnett Michael Bradley

The shallow waters of the world's coasts comprise a variety of ecosystems such as tidal wetlands, salt marshes, sand flats, rocky coasts, and coral reef flats, and encompass complexes of pelagic and benthic, vegetated and unvegetated habitats. These disparate ecosystems are bound together by one common feature; that the pattern of life for marine organisms, the outcomes of process and the functioning of the ecosystems are irrevocably influenced by the tide. Focusing on the tide highlights a unique component, the intertidal zone – an area that alternates between exposure to the atmosphere and inundation by marine waters. While the tide has diverse influences on the pattern of life and on the processes that regulate ecological function in tidally dominated ecosystems, much of this can be captured in one idea, that the multi-scale predictability of tides provides vital information for the organisms utilising these systems. We explore this idea by considering the dynamics of the nekton assemblages of tidally dominated ecosystems, the roles that nekton play in the functioning of those systems, and how these dynamics are fundamentally influenced by the differential responses of nekton and their prey to the predictability of tides. Further, we discuss the nature of the information tides provide to biota, the trade-offs inherent in utilising tidally available resources, and strategies employed by biota to take advantage of the tidal information and the need for strategic trade-offs.

Nekton

Biota

Marine ecosystem

Salt marsh

10.1016/j.ecss.2024.108825

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Habitat degradation has species-specific effects on the stress response of coral reef fishes

Journal of Experimental Marine Biology and Ecology (2024)

Eric P. Fakan Alexia Dubuc Christopher R. Hemingson Mark I. McCormick Andrew S. Hoey

10.1016/j.jembe.2024.152070

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Patterns of reef fish taxonomic and functional diversity in the Eastern Tropical Pacific

Ecography (2023)

Alexia Dubuc Juan P. Quimbayo Juan José Alvarado Tatiana Araya‐Arce Andrea Arriaga

A core challenge in ecology is identifying the factors that determine species distribution and functional diversity of species assemblages. Reef fish are the most diverse group of vertebrates, form taxonomically rich and functionally diverse communities and represent a key source of food for humans. We examine regional distribution patterns of reef fish species richness and functional diversity and investigate how these are determined by historical, biogeographic, energetic, and anthropogenic factors. We compiled data from 3,312 underwater visual censuses performed at 122 locations comprising rocky and coral reefs along the Eastern Tropical Pacific (ETP). We used generalized linear mixed‐effects models (GLMMs) implemented in a Bayesian framework to investigate whether distance from quaternary refugia, distance from mainland, shelf area, primary productivity, sea surface temperature (SST), human population gravity, and conservation status influence reef fish species richness and functional diversity in the ETP. Species richness and functional richness (FRic) peaked towards the center of the ETP and our null model suggests that FRic followed a spatial pattern that would be predicted by species richness. Additionally, functional evenness (FEve) was highest at higher latitudes whereas functional dispersion (FDis) was homogeneous throughout the ETP. Species richness was negatively influenced by shelf area and distance from mainland, but positively influenced by SST and conservation status. FEve was influenced by human population gravity and FDis by shelf area. Reef fish species richness and functional diversity in the ETP exhibited a strong division within the region mainly mediated by SST and human population gravity. Our results also suggest that dominant species within small shelf areas share more common traits than dominant species in large areas. This study uncovers previously unknown regional patterns of reef fish functional diversity and provides new insights into how historical, biogeographic, energetic, and anthropogenic factors influence complementary biodiversity facets.

Coastal fish

10.1111/ecog.06536

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Citations (9)

Author response for "Patterns of reef fish taxonomic and functional diversity in the Eastern Tropical Pacific"

Alexia Dubuc Juan P. Quimbayo Juan José Alvarado Tatiana Araya‐Arce Andrea Arriaga

Tropical Eastern Pacific

Tropical marine climate

10.1111/ecog.06536/v4/response1

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Patterns of fish utilisation in a tropical Indo-Pacific mangrove-coral seascape, New Caledonia: Fish utilisation of a mangrove forest in New Caledonia

bioRxiv (Cold Spring Harbor Laboratory) (2018)

Alexia Dubuc Nathan J. Waltham Ronald J. Baker Cyril Marchand Marcus Sheaves

Abstract Mangrove forests are important habitats for fish. However, their utilisation by fish, and the specific values they confer, are still not fully understood. This study details how fish use mangrove forests in an Indo-Pacific mangrove-coral reef seascape. Sampling was conducted using underwater video cameras (UVCs) to describe spatial and temporal variations in fish assemblages across a small-scale (~ 2.5 km2) system, and over the tidal and lunar cycle. UVCs were deployed in the two main component habitats of mangrove forests: at the mangrove forest edge, and inside the forest (5 m from the forest edge). The patterns of utilisation of fish were established across the tidal and lunar cycle. Proximity to coral reefs had a strong influence on the mangrove fish community, as most fish recorded were reef-associated. Juveniles of 12 reef species were observed, including two species classified as vulnerable on the IUCN list and one endemic species. Fish assemblages on the mangrove edge differed substantially from those inside the forest. Most fish utilised the forest edge with few species making regular use of in- forest habitats, supporting the contention that most fish species remain on the edge and potentially retreat into the forest for opportunistic feeding, or when threatened by larger predators. Species-specific patterns of utilisation varied across the tidal and lunar cycle. Small differences in depth profiles and substrate across the small-scale system had a substantial effect on fish assemblages, highlighting the importance of accounting for spatial heterogeneity in these factors. These data provide important information for managers to implement adequate conservation strategies that includes broader interconnected habitat mosaics.

Seascape

Coastal fish

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Extreme dissolved oxygen variability in urbanised tropical wetlands: The need for detailed monitoring to protect nursery ground values

Estuarine Coastal and Shelf Science (2017)

Alexia Dubuc Nathan J. Waltham Martino E. Malerba Marcus Sheaves

Hypoxia

Fish kill

Diel vertical migration

10.1016/j.ecss.2017.09.014

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Citations (31)

Patterns of fish utilisation in a tropical Indo-Pacific mangrove-coral seascape, New Caledonia

bioRxiv (Cold Spring Harbor Laboratory) (2018)

Alexia Dubuc Nathan J. Waltham Ronald J. Baker Cyril Marchand Marcus Sheaves

Abstract Mangrove forests are important habitats for fish. However, their utilisation by fish, and the specific values they confer, are still not fully understood. This study describes how fish use mangrove forests in an Indo-Pacific mangrove-coral reef seascape. Sampling was conducted using underwater video cameras (UVCs) to describe spatial and temporal variations in fish assemblages across a small-scale (~ 2.5 km 2 ) system, and over the tidal and lunar cycle. UVCs were deployed in the two main component habitats of mangrove forests: at the mangrove forest edge, and inside the forest (5 m from the forest edge), to establish patterns of utilisation of fish across the tidal and lunar cycle. Proximity to coral reefs had a strong influence on the mangrove fish community, as most fish recorded were reef-associated. Juveniles of 12 reef species were observed, including two species classified as vulnerable on the IUCN list, and one endemic species. Fish assemblages on the mangrove edge differed significantly from those inside the forest. Most fish utilised the forest edge, with few species making regular use of in-forest habitats, supporting the contention that most fish species remain on the edge and potentially retreat into the forest for opportunistic feeding, or when threatened by larger predators. Species-specific patterns of utilisation varied across the tidal and lunar cycle. Small differences in depth profiles and substrate across the small-scale system had a significant effect on fish assemblages, highlighting the importance of accounting for spatial heterogeneity in these factors. These data provide important information for managers to implement adequate conservation strategies that include broader interconnected habitat mosaics.

Seascape

Coastal fish

Indo-Pacific

10.1101/455931

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Hypoxia in mangroves: occurrence and impact on valuable tropical fish habitat

Biogeosciences (2019)

Alexia Dubuc Ronald J. Baker Cyril Marchand Nathan J. Waltham Marcus Sheaves

Abstract. Intertidal mangrove forests are harsh environments that can naturally experience hypoxia in association with low tide. However, we know relatively little about dissolved oxygen (DO) fluctuations and DO-induced responses by fish, although DO is a fundamental water quality parameter. This study examines DO as a potential factor regulating the utilisation of intertidal mangrove forests by fish and consequently their widely recognised feeding, refuge and nursery values. We deployed underwater video cameras, coupled with DO and depth loggers, in a mangrove forest to record changes in fish assemblages in response to tidal variations in DO and other associated environmental parameters. Our results indicate that DO underwent extreme tidal fluctuations, reaching levels as low as 14 % saturation. As DO was identified as a significant factor for explaining variability in fish assemblage composition, we further investigated fish responses to DO fluctuations. Higher taxonomic richness and frequencies of occurrence were observed once DO reached 70 %–80 % saturation. More detailed examination revealed species-specific responses. Three distinct patterns of mangrove utilisation in response to DO were identified, driven by apparent taxa's behavioural DO avoidance thresholds. Most taxa did not display any behavioural avoidance, including presence at the lowest DO levels, while other taxa were not observed either below 50 %–60 % saturation or below 70 %–80 % saturation. This implies that tidal migrations, often observed in intertidal environments, could be the result of differential DO tolerances and are not simply initiated by changes in water depth. Taxa remaining in the mangrove forest even at low DO were on average more frequently observed than the other taxa and were mostly species commonly associated with mangrove habitats. This suggests that being adapted to withstand low DO might be an important condition for using mangrove habitats extensively. The need of being tolerant to low DO could constrain fish utilisation and explain the relatively low species richness often observed in other intertidal mangrove forests.

Hypoxia

10.5194/bg-16-3959-2019

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Citations (32)

Coping with environmental degradation: Physiological and morphological adjustments of wild mangrove fish to decades of aquaculture-induced nutrient enrichment

Marine Pollution Bulletin (2024)

Alexia Dubuc Jodie L. Rummer Laurent Vigliola Hugues Lemonnier

Hypoxia

Fish physiology

10.1016/j.marpolbul.2024.116599

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Citations (2)