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The non-indigenous Oithona davisae in a Mediterranean transitional environment: coexistence patterns with competing species
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The non-indigenous Oithona davisae in a Mediterranean transitional environment: coexistence patterns with competing species
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Journal Article
The non-indigenous Oithona davisae in a Mediterranean transitional environment: coexistence patterns with competing species
2021
Overview
The Venice lagoon (VL) has been recognized as a hot spot of introduction of non-indigenous species (NIS), due to several anthropogenic factors and environmental stressors that combined may facilitate NIS invasions. In the last decades an increasing number of zooplankton NIS have been observed in the VL. This work aims to provide a picture of the annual cycle and distribution of the recently recorded non-indigenous copepod
Oithona davisae,
considering the coexistence patterns with the congeneric resident
Oithona nana
. Therefore, zooplankton samplings were carried out monthly from August 2016 to July 2017 at five Long-Term Ecological Research LTER stations in the VL.
Oithona davisae
showed a persistent occurrence throughout the year with the highest abundances in the warm season and in the inner areas, while the congeneric
O. nana
, showing a different distribution pattern, resulted more abundant near the inlets of the Lagoon, where
O. davisae
reached the minimum density.
Oithona davisae
seems to find local conditions that promote its settlement and distribution, especially in the inner and more trophic lagoon sites. In other European coastal embayments or transitional waters,
O. davisae
occupied the niche left by the indigenous
O. nana
or can replace this congeneric species through competitive exclusion mechanisms. Our data indicate that, for now, such species replacement has not occurred in the VL. One of the causes is the extreme variety of habitats and niches offered by this environment allowing a balanced coexistence with
O. nana
and in general with the resident copepod community.
