Environmental influences on the recruitment dynamics of juvenile European eels, Anguilla anguilla, in a small estuary of the Tyrrhenian Sea, Sardinia, Italy
Abstract The European eel, Anguilla anguilla , is a catadromous and migratory species of commercial importance. Its complex life cycle results in its exposure to many risk factors, which have resulted in stock declines across all life stages since the 1970s. The temporal recruitment dynamics of juve...
Published in: | Aquatic Conservation: Marine and Freshwater Ecosystems |
---|---|
Main Authors: | , , , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2020
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/aqc.3362 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Faqc.3362 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aqc.3362 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/aqc.3362 |
id |
crwiley:10.1002/aqc.3362 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/aqc.3362 2024-06-02T07:55:10+00:00 Environmental influences on the recruitment dynamics of juvenile European eels, Anguilla anguilla, in a small estuary of the Tyrrhenian Sea, Sardinia, Italy Podda, Cinzia Palmas, Francesco Frau, Giacomo Chessa, Giovanna Culurgioni, Jacopo Diciotti, Riccardo Fois, Nicola Sabatini, Andrea Councilor for Agriculture and Agro-Pastoral Reform, Sardinia, Italy 2020 http://dx.doi.org/10.1002/aqc.3362 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Faqc.3362 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aqc.3362 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/aqc.3362 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Aquatic Conservation: Marine and Freshwater Ecosystems volume 30, issue 8, page 1638-1648 ISSN 1052-7613 1099-0755 journal-article 2020 crwiley https://doi.org/10.1002/aqc.3362 2024-05-03T11:52:35Z Abstract The European eel, Anguilla anguilla , is a catadromous and migratory species of commercial importance. Its complex life cycle results in its exposure to many risk factors, which have resulted in stock declines across all life stages since the 1970s. The temporal recruitment dynamics of juvenile eels (glass eels and elvers) were investigated in a small Mediterranean estuary (Sardinia, Italy). The composition of the population and the monthly and seasonal variations in the abundances of juvenile eels was assessed over 78 sampling events (from February 2017 to February 2018). Furthermore, the effects of abiotic variables on the abundances of glass eels and elvers were investigated using generalized additive models (GAMs). Glass eels had the greatest abundance during the winter months, whereas elvers had the greatest abundance during spring. Modelling revealed that the abundance of glass eels was mostly explained by the combined effects of water temperature (12.3–14.5 °C), tidal coefficient (40–110 cm), moon phase, season, and river mouth condition, whereas the abundance of elvers was associated with water temperature (14–21 °C), dissolved oxygen content (>7 mg/L), and season. These results suggest that the annual recruitment of juvenile eels occurs throughout the year, with clear seasonal migration dynamics. The use of multiple statistical approaches allowed us to identify the importance of several environmental variables in regulating the recruitment dynamics, providing useful information for conserving eel stocks through the restoration of the natural flow regime and the connectivity between freshwater habitats and the sea. Article in Journal/Newspaper Anguilla anguilla European eel Wiley Online Library Aquatic Conservation: Marine and Freshwater Ecosystems 30 8 1638 1648 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The European eel, Anguilla anguilla , is a catadromous and migratory species of commercial importance. Its complex life cycle results in its exposure to many risk factors, which have resulted in stock declines across all life stages since the 1970s. The temporal recruitment dynamics of juvenile eels (glass eels and elvers) were investigated in a small Mediterranean estuary (Sardinia, Italy). The composition of the population and the monthly and seasonal variations in the abundances of juvenile eels was assessed over 78 sampling events (from February 2017 to February 2018). Furthermore, the effects of abiotic variables on the abundances of glass eels and elvers were investigated using generalized additive models (GAMs). Glass eels had the greatest abundance during the winter months, whereas elvers had the greatest abundance during spring. Modelling revealed that the abundance of glass eels was mostly explained by the combined effects of water temperature (12.3–14.5 °C), tidal coefficient (40–110 cm), moon phase, season, and river mouth condition, whereas the abundance of elvers was associated with water temperature (14–21 °C), dissolved oxygen content (>7 mg/L), and season. These results suggest that the annual recruitment of juvenile eels occurs throughout the year, with clear seasonal migration dynamics. The use of multiple statistical approaches allowed us to identify the importance of several environmental variables in regulating the recruitment dynamics, providing useful information for conserving eel stocks through the restoration of the natural flow regime and the connectivity between freshwater habitats and the sea. |
author2 |
Councilor for Agriculture and Agro-Pastoral Reform, Sardinia, Italy |
format |
Article in Journal/Newspaper |
author |
Podda, Cinzia Palmas, Francesco Frau, Giacomo Chessa, Giovanna Culurgioni, Jacopo Diciotti, Riccardo Fois, Nicola Sabatini, Andrea |
spellingShingle |
Podda, Cinzia Palmas, Francesco Frau, Giacomo Chessa, Giovanna Culurgioni, Jacopo Diciotti, Riccardo Fois, Nicola Sabatini, Andrea Environmental influences on the recruitment dynamics of juvenile European eels, Anguilla anguilla, in a small estuary of the Tyrrhenian Sea, Sardinia, Italy |
author_facet |
Podda, Cinzia Palmas, Francesco Frau, Giacomo Chessa, Giovanna Culurgioni, Jacopo Diciotti, Riccardo Fois, Nicola Sabatini, Andrea |
author_sort |
Podda, Cinzia |
title |
Environmental influences on the recruitment dynamics of juvenile European eels, Anguilla anguilla, in a small estuary of the Tyrrhenian Sea, Sardinia, Italy |
title_short |
Environmental influences on the recruitment dynamics of juvenile European eels, Anguilla anguilla, in a small estuary of the Tyrrhenian Sea, Sardinia, Italy |
title_full |
Environmental influences on the recruitment dynamics of juvenile European eels, Anguilla anguilla, in a small estuary of the Tyrrhenian Sea, Sardinia, Italy |
title_fullStr |
Environmental influences on the recruitment dynamics of juvenile European eels, Anguilla anguilla, in a small estuary of the Tyrrhenian Sea, Sardinia, Italy |
title_full_unstemmed |
Environmental influences on the recruitment dynamics of juvenile European eels, Anguilla anguilla, in a small estuary of the Tyrrhenian Sea, Sardinia, Italy |
title_sort |
environmental influences on the recruitment dynamics of juvenile european eels, anguilla anguilla, in a small estuary of the tyrrhenian sea, sardinia, italy |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/aqc.3362 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Faqc.3362 https://onlinelibrary.wiley.com/doi/pdf/10.1002/aqc.3362 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/aqc.3362 |
genre |
Anguilla anguilla European eel |
genre_facet |
Anguilla anguilla European eel |
op_source |
Aquatic Conservation: Marine and Freshwater Ecosystems volume 30, issue 8, page 1638-1648 ISSN 1052-7613 1099-0755 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/aqc.3362 |
container_title |
Aquatic Conservation: Marine and Freshwater Ecosystems |
container_volume |
30 |
container_issue |
8 |
container_start_page |
1638 |
op_container_end_page |
1648 |
_version_ |
1800746379916607488 |