Invasive Neogobius melanostomus in the Lithuanian Baltic Sea coast: Trophic role and impact on the diet of piscivorous fish
The partitioning of trophic niches is central for understanding the ecosystem processes associated with biological invasions. The recent successful establishment of Neogobius melanostomus in the Baltic Sea posed questions whether this invader found its own trophic niche, to what extent it competes w...
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ftlitinstagrecon:oai:elaba:63588598 2023-05-15T16:19:17+02:00 Invasive Neogobius melanostomus in the Lithuanian Baltic Sea coast: Trophic role and impact on the diet of piscivorous fish Rakauskas, Vytautas Šidagytė-Copilas, Eglė Stakėnas, Saulius Garbaras, Andrius 2020 http://gtc.lvb.lt/GTC:ELABAPDB63588598&prefLang=en_US eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jglr.2020.03.005 http://gtc.lvb.lt/GTC:ELABAPDB63588598&prefLang=en_US Journal of Great Lakes research, Oxon : International Association of Great Lakes Research, 2020, vol. 46, iss. 3, p. 597-608 ISSN 0380-1330 Baltic Sea invasions Diet change Round goby Seasonal data Stomach content Trophic overlaps info:eu-repo/semantics/article 2020 ftlitinstagrecon https://doi.org/10.1016/j.jglr.2020.03.005 2021-12-02T00:57:21Z The partitioning of trophic niches is central for understanding the ecosystem processes associated with biological invasions. The recent successful establishment of Neogobius melanostomus in the Baltic Sea posed questions whether this invader found its own trophic niche, to what extent it competes with native benthivores, and if commercially important fish could be affected. In this study conducted along the Lithuanian Baltic coast, we used the stable isotope approach to identify potential trophic competitors of N. melanostomus. We also employed gut content analysis to quantify the incorporation of N. melanostomus into the diet of native piscivores. Furthermore, pre-invasion gut content data enabled us to check if there were any changes in the piscivorous fish diet after the invasion. We found N. melanostomus to be a subdominant benthivorous fish during the warm season of 2012–2013. It occupied a higher trophic position in spring (3.9) than in autumn (2.9), but spring specimens were also larger. The invader exploited a narrow (standard ellipse area 0.3–0.5‰2) and distinct core isotopic niche, but total niche area overlaps indicated potential trophic competition with Pleuronectes platessa, Platichthys flesus, Pomatoschistus minutus and Gasterosteus aculeatus in spring, and with P. minutus in autumn. The invader dominated the warm season (spring–autumn) diet of piscivorous fish (Gadus morhua, Myoxocephalus scorpius, Perca fluviatilis, Scophthalmus maximus) and its invasion was generally associated with decreased crustacean and increased fish-prey content. Therefore, it is plausible that N. melanostomus has created novel trophic links within the food web. Article in Journal/Newspaper Gadus morhua Scophthalmus maximus LAEI VL (Lithuanian Institute of Agrarian Economics Virtual Library) Journal of Great Lakes Research 46 3 597 608 |
institution |
Open Polar |
collection |
LAEI VL (Lithuanian Institute of Agrarian Economics Virtual Library) |
op_collection_id |
ftlitinstagrecon |
language |
English |
topic |
Baltic Sea invasions Diet change Round goby Seasonal data Stomach content Trophic overlaps |
spellingShingle |
Baltic Sea invasions Diet change Round goby Seasonal data Stomach content Trophic overlaps Rakauskas, Vytautas Šidagytė-Copilas, Eglė Stakėnas, Saulius Garbaras, Andrius Invasive Neogobius melanostomus in the Lithuanian Baltic Sea coast: Trophic role and impact on the diet of piscivorous fish |
topic_facet |
Baltic Sea invasions Diet change Round goby Seasonal data Stomach content Trophic overlaps |
description |
The partitioning of trophic niches is central for understanding the ecosystem processes associated with biological invasions. The recent successful establishment of Neogobius melanostomus in the Baltic Sea posed questions whether this invader found its own trophic niche, to what extent it competes with native benthivores, and if commercially important fish could be affected. In this study conducted along the Lithuanian Baltic coast, we used the stable isotope approach to identify potential trophic competitors of N. melanostomus. We also employed gut content analysis to quantify the incorporation of N. melanostomus into the diet of native piscivores. Furthermore, pre-invasion gut content data enabled us to check if there were any changes in the piscivorous fish diet after the invasion. We found N. melanostomus to be a subdominant benthivorous fish during the warm season of 2012–2013. It occupied a higher trophic position in spring (3.9) than in autumn (2.9), but spring specimens were also larger. The invader exploited a narrow (standard ellipse area 0.3–0.5‰2) and distinct core isotopic niche, but total niche area overlaps indicated potential trophic competition with Pleuronectes platessa, Platichthys flesus, Pomatoschistus minutus and Gasterosteus aculeatus in spring, and with P. minutus in autumn. The invader dominated the warm season (spring–autumn) diet of piscivorous fish (Gadus morhua, Myoxocephalus scorpius, Perca fluviatilis, Scophthalmus maximus) and its invasion was generally associated with decreased crustacean and increased fish-prey content. Therefore, it is plausible that N. melanostomus has created novel trophic links within the food web. |
format |
Article in Journal/Newspaper |
author |
Rakauskas, Vytautas Šidagytė-Copilas, Eglė Stakėnas, Saulius Garbaras, Andrius |
author_facet |
Rakauskas, Vytautas Šidagytė-Copilas, Eglė Stakėnas, Saulius Garbaras, Andrius |
author_sort |
Rakauskas, Vytautas |
title |
Invasive Neogobius melanostomus in the Lithuanian Baltic Sea coast: Trophic role and impact on the diet of piscivorous fish |
title_short |
Invasive Neogobius melanostomus in the Lithuanian Baltic Sea coast: Trophic role and impact on the diet of piscivorous fish |
title_full |
Invasive Neogobius melanostomus in the Lithuanian Baltic Sea coast: Trophic role and impact on the diet of piscivorous fish |
title_fullStr |
Invasive Neogobius melanostomus in the Lithuanian Baltic Sea coast: Trophic role and impact on the diet of piscivorous fish |
title_full_unstemmed |
Invasive Neogobius melanostomus in the Lithuanian Baltic Sea coast: Trophic role and impact on the diet of piscivorous fish |
title_sort |
invasive neogobius melanostomus in the lithuanian baltic sea coast: trophic role and impact on the diet of piscivorous fish |
publishDate |
2020 |
url |
http://gtc.lvb.lt/GTC:ELABAPDB63588598&prefLang=en_US |
genre |
Gadus morhua Scophthalmus maximus |
genre_facet |
Gadus morhua Scophthalmus maximus |
op_source |
Journal of Great Lakes research, Oxon : International Association of Great Lakes Research, 2020, vol. 46, iss. 3, p. 597-608 ISSN 0380-1330 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jglr.2020.03.005 http://gtc.lvb.lt/GTC:ELABAPDB63588598&prefLang=en_US |
op_doi |
https://doi.org/10.1016/j.jglr.2020.03.005 |
container_title |
Journal of Great Lakes Research |
container_volume |
46 |
container_issue |
3 |
container_start_page |
597 |
op_container_end_page |
608 |
_version_ |
1766005658866417664 |