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\begin{document}

\title{Community size structure varies with predator-prey size relationships
and temperature across Australian reefs}



\author[1]{Amy Coghlan}%
\author[2]{Julia Blanchard}%
\author[1]{Freddie Heather}%
\author[3]{Rick Stuart-Smith}%
\author[3]{Graham Edgar}%
\author[3]{Asta Audzijonyte}%
\affil[1]{University of Tasmania School of Natural Sciences}%
\affil[2]{University of Sheffield}%
\affil[3]{University of Tasmania}%


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  \date{May 27, 2024}


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\begin{abstract}
Climate change and fisheries exploitation are dramatically changing the
species composition, abundances, and size spectra of fish communities.
We explore whether variation in abundance-size spectra, a widely studied
ecosystem feature, is influenced by a critical parameter thought to
govern the shape of size-structured ecosystems---the relationship
between the sizes of predators and their prey (predator-prey mass
ratios, or PPMRs). PPMR estimates are lacking for vast numbers of fish
species, including at the broader trophic guild scale. Using
measurements of 8,128 prey items in gut contents of 97 reef fish
species, we established PPMRs for four major trophic guilds (piscivores,
invertivores, planktivores and herbivores) using linear mixed effects
models. To assess theoretical predictions that higher mean
community-level PPMR leads to shallower size spectrum slopes, we
compared observations of mean community-level PPMR with size spectrum
slopes for coastal reef sites distributed around Australia. PPMRs of
individual fishes were remarkably high (median \textasciitilde{}71,000),
with significant variation between different trophic guilds
(\textasciitilde{}890 for piscivores; \textasciitilde{}83,000 for
planktivores), and \textasciitilde{}8,700 for whole communities.
Community-level PPMRs were positively related to size spectrum slopes,
broadly consistent with theory, however, this pattern was also
influenced by the latitudinal temperature gradient. Tropical reefs
showed a stronger relationship between community-level PPMRs and
community size spectrum slopes than temperate reefs. The extent that
these patterns apply outside Australia, and consequences for community
structure and dynamics, are key areas for future investigation.%
\end{abstract}%



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\textbf{Hosted file}

\verb`Coghlan_PPMR_EE_Article_2022_03_09.docx`  available at \url{https://authorea.com/users/464768/articles/559536-community-size-structure-varies-with-predator-prey-size-relationships-and-temperature-across-australian-reefs}

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