Journal
JOURNAL OF BIOGEOGRAPHY
Volume 48, Issue 10, Pages 2469-2485Publisher
WILEY
DOI: 10.1111/jbi.14214
Keywords
dedicated cleaners; diversity gradient; facultative cleaners; marine mutualism; marine realms; relative species richness; standardize abundance; trait species
Categories
Funding
- Portuguese Science Foundation [DL57/2016/CP1440/CT0019]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [FAPESP 2018/21380-0]
- National Council of Scientific and Technological Development [300992/79-ZO]
- CESAB (Foundation for Research on Biodiversity)
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The study explored the variability in traits of cleaner fishes and their correlation with historical, environmental, ecological and geographical drivers at global reefs. Results showed that facultative cleaners exhibited high trait variability, while dedicated cleaners had low trait variability. Cleaner species richness was higher in the Indo-Pacific and Caribbean provinces, but the relative richness and standardized abundance were higher in the Atlantic and Eastern Pacific. Isolation and environmental factors influenced the relative richness of both facultative and dedicated cleaners. Local species richness and abundance of potential clients were also found to have a strong relationship with cleaner fish abundance.
Aim Several drivers explain the global distribution of all reef fish. However, whether these drivers also explain the distribution and traits of a functional subgroup involving cleaner fishes remain unclear. Here we examine the variation in traits of cleaner fishes and test whether historical, environmental, ecological and geographical drivers are correlated with cleaner species richness and abundance at global reefs. Location Tropical and subtropical reefs. Taxon Actinopterygii. Methods We tested whether species traits and trait space vary between facultative (i.e. species that clean only during the juvenile stages or sporadically) and dedicated (i.e. species that clean during their whole lives) cleaner types. We compiled data from local checklists (relative richness) and belt transects (standardized richness and abundance). We built four models to test whether past and current isolation (i.e. distance from Quaternary refugia and biodiversity centres), sea temperature, primary productivity, local species pool and abundance of potential clients influenced the relative richness and abundance of cleaners. Results Facultative cleaners had high trait variability that contributed disproportionally to the trait space, whereas dedicated cleaners exhibited low trait variability. Cleaner species richness was higher in the Indo-Pacific and Caribbean provinces, but the relative richness and standardized abundance of cleaners were higher in the Atlantic (i.e. North Eastern and Southwestern) and Eastern Pacific. Isolation influenced the relative richness of facultative cleaners, whereas the distance to Quaternary refugia, sea temperature and isolation influenced the relative richness of dedicated cleaners. Local species richness and standardized abundance of cleaner fish exhibited a strong relationship with regional diversity. The standardized abundance of both facultative and dedicated cleaners was influenced by the abundance of potential clients and the local species pool. Main conclusions The small trait space occupied by cleaner fishes may reflect their restricted origin among lineages of reef fishes. Differences in the relative richness and standardized abundance of cleaner fishes across marine realms suggest a strong influence on biogeographical history. Our results also indicate that cleaner fishes originated mostly in peripheral areas in high latitudes due to the absence of dedicated cleaners. Our results imply that cleaner fishes do not follow the pattern of main centres of origin described for reef fishes due to opportunistic cleaning behaviour that originated with higher frequency at locations with low species richness.
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