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\begin{document}

\title{Mean reef fish body size decreases in warmer waters}



\author[1]{Amy Coghlan}%
\author[1]{Julia Blanchard}%
\author[2]{Simon Wotherspoon}%
\author[1]{Rick Stuart-Smith}%
\author[1]{Graham Edgar}%
\author[1]{Neville Barrett}%
\author[1]{Asta Audzijonyte}%
\affil[1]{University of Tasmania}%
\affil[2]{Australian Antarctic Division}%


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  \date{May 27, 2024}


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\begin{abstract}
Aquatic ectotherms often attain smaller body sizes at higher
temperatures. By analysing \textasciitilde{}15,000 coastal-reef fish
surveys across a 15oC spatial sea surface temperature (SST) gradient, we
found that the mean length of fish length in communities decreases by
\textasciitilde{}5\% for each 1oC temperature increase across space.
This equated to a 50\% decrease in mean length from 14 to 29oC mean
annual SST. We found that trophic guild composition shifts from
domination by herbivores and planktivores in the tropics, to
invertivores and piscivores in cooler waters. By investigating the
contribution of trophic composition to community-level mean length, we
show \textasciitilde{}25\% of temperature-related changes could be
attributed to trophic composition at the warmest sites, but
\textless{}1\% at colder temperatures. Our findings suggest that small
changes in temperature will lead to large changes in fish community body
sizes, driven both by community trophic composition in warm waters and
mean sizes within trophic guilds.%
\end{abstract}%



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\textbf{Hosted file}

\verb`Coghlan et al 2023 Temp Size Fish Article_Ecology Letters - RESUBMIT_Nov_23.docx`  available at \url{https://authorea.com/users/640990/articles/684061-mean-reef-fish-body-size-decreases-in-warmer-waters}

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