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\begin{document}

\title{Discovery of a ponto-caspian mysid shrimp (Hemimysis anomala) in South
East England with likely bird-mediated dispersal}



\author[1]{Christopher Andrews}%
\author[2]{Kim Wallis}%
\author[1]{Tom Cameron}%
\affil[1]{University of Essex}%
\affil[2]{Essex and Suffolk Water}%


\vspace{-1em}



  
  \date{May 08, 2024}


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\begin{abstract}
The Ponto-Caspian Bloody-red mysid shrimp (Hemimysis anomala) was
discovered in a large freshwater reservoir in the south-east of England
in 2020 (Abberton reservoir, Essex, UK). The shrimp was discovered while
carrying out aquatic invertebrate surveys across a range of permanent,
semi-permanent and seasonal habitats between October and December 2020.
The shrimp were found in semi-permanent lagoons adjacent to and
connected to the main reservoir and in shallow water bays in the main
reservoir. Surveys conducted in January 2021 along a reservoir wall also
found the shrimp but no accurate abundance estimates were made. Surveys
conducted across the same sites with increased effort in July 2021 did
not find any individuals in lagoons, bays or off the reservoir wall in
either shallow or deep shelves. The identity of the species was
confirmed with high magnification inverted light microscopy due to the
shape and setae distribution of the antennal scale and telson in
addition to the characteristic bloody red colour of the shrimp
pre-preservation. Previous introductions of this species to the UK have
been identified before, but whether these propagules arrived from
natural or anthropogenic introductions was not clear. Abberton reservoir
has no public access for boating or recreational activities other than a
small, restricted local angling group but is an internationally
important site for migratory and overwintering waterfowl and waders. The
migration routes of several waterfowl species for which Abberton is
noted would mean that this new shrimp species is likely to have been
introduced from either its native range or from its expanded non-native
range in the UK or Netherlands by birds. It is not yet confirmed that
this discovery represents a successful invasion of this species at
Abberton and if it is, when it arrived or what effects it may be having
on the food web of this site.%
\end{abstract}%



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