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Mesohabitat Spawning Preference of the Anadromous Twaite Shad (Alosa fallax, Lacépède 1803) in the Tagliamento River (Italy).

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Title: Mesohabitat Spawning Preference of the Anadromous Twaite Shad (Alosa fallax, Lacépède 1803) in the Tagliamento River (Italy).
Authors: Negro, Giovanni1 (AUTHOR) giovanni.negro@polito.it, Lesa, Davide2 (AUTHOR), Bertoli, Marco3 (AUTHOR), Guglielmetto, Alessandro1 (AUTHOR), Pinna, Beatrice1 (AUTHOR), Forte, Simone1 (AUTHOR), Spadavecchia, Claudio1 (AUTHOR), Maschio, Paolo1 (AUTHOR), Pizzul, Elisabetta3 (AUTHOR), Vezza, Paolo1 (AUTHOR)
Source: Ecohydrology. Jan2025, Vol. 18 Issue 1, p1-17. 17p.
Subject Terms: *Habitat selection, *Anadromous fishes, Animal sexual behavior, Infrared cameras, Random forest algorithms
Abstract: Alosa fallax (Lacépède, 1803) is an anadromous fish which utilizes European rivers for spawning. As many anadromous species, Twaite shad populations are declining due to river damming and hydromorphological alterations, which impact their spawning sites. In this study, we developed mesohabitat suitability criteria for the spawning period of A. fallax by analysing the geomorphic units (GUs), with their local habitat attribute, in which the fish prefers to spawn. The study was conducted in the Tagliamento River (NE Italy). Habitat depiction was performed following the MesoHABitat SImulation Model (MesoHABSIM) approach. High‐resolution spatial information from Uncrewed Aerial Systems (UAS), a two‐dimensional (2D) hydrodynamic model and field data collected during the spawning period were utilized for habitat attribute evaluation. The association between spawning sites and GUs characteristics was explored by training a classification random forest (RF) model. The final parsimonious RF model demonstrated high accuracy (98.8%) and true skill statistic (97.6%), indicating that A. fallax prefers glides and riffles with shallow depths (0.15–0.45 m), moderate current velocities (0.30–0.75 m/s) and small‐sized sediment (diameter 0.2–6 cm) for spawning. Using an infrared camera, 72 surface mating events were distinctly recorded between 11.30 PM and 02.15 AM over two nights, demonstrating the technique's suitability for observing shad mating activity. The video analysis revealed that the monitored A. fallax population exhibited similar mating behaviour to other European shads (e.g., Alosa alosa). This study provides useful insights to develop novel management approaches for preserving or restoring the spawning habitat of the A. fallax, supporting its conservation. [ABSTRACT FROM AUTHOR]
Copyright of Ecohydrology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Mesohabitat Spawning Preference of the Anadromous Twaite Shad (Alosa fallax, Lacépède 1803) in the Tagliamento River (Italy).
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  Data: <searchLink fieldCode="AR" term="%22Negro%2C+Giovanni%22">Negro, Giovanni</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> giovanni.negro@polito.it</i><br /><searchLink fieldCode="AR" term="%22Lesa%2C+Davide%22">Lesa, Davide</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bertoli%2C+Marco%22">Bertoli, Marco</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Guglielmetto%2C+Alessandro%22">Guglielmetto, Alessandro</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pinna%2C+Beatrice%22">Pinna, Beatrice</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Forte%2C+Simone%22">Forte, Simone</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Spadavecchia%2C+Claudio%22">Spadavecchia, Claudio</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Maschio%2C+Paolo%22">Maschio, Paolo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pizzul%2C+Elisabetta%22">Pizzul, Elisabetta</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vezza%2C+Paolo%22">Vezza, Paolo</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Ecohydrology%22">Ecohydrology</searchLink>. Jan2025, Vol. 18 Issue 1, p1-17. 17p.
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  Data: *<searchLink fieldCode="DE" term="%22Habitat+selection%22">Habitat selection</searchLink><br />*<searchLink fieldCode="DE" term="%22Anadromous+fishes%22">Anadromous fishes</searchLink><br /><searchLink fieldCode="DE" term="%22Animal+sexual+behavior%22">Animal sexual behavior</searchLink><br /><searchLink fieldCode="DE" term="%22Infrared+cameras%22">Infrared cameras</searchLink><br /><searchLink fieldCode="DE" term="%22Random+forest+algorithms%22">Random forest algorithms</searchLink>
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  Data: Alosa fallax (Lacépède, 1803) is an anadromous fish which utilizes European rivers for spawning. As many anadromous species, Twaite shad populations are declining due to river damming and hydromorphological alterations, which impact their spawning sites. In this study, we developed mesohabitat suitability criteria for the spawning period of A. fallax by analysing the geomorphic units (GUs), with their local habitat attribute, in which the fish prefers to spawn. The study was conducted in the Tagliamento River (NE Italy). Habitat depiction was performed following the MesoHABitat SImulation Model (MesoHABSIM) approach. High‐resolution spatial information from Uncrewed Aerial Systems (UAS), a two‐dimensional (2D) hydrodynamic model and field data collected during the spawning period were utilized for habitat attribute evaluation. The association between spawning sites and GUs characteristics was explored by training a classification random forest (RF) model. The final parsimonious RF model demonstrated high accuracy (98.8%) and true skill statistic (97.6%), indicating that A. fallax prefers glides and riffles with shallow depths (0.15–0.45 m), moderate current velocities (0.30–0.75 m/s) and small‐sized sediment (diameter 0.2–6 cm) for spawning. Using an infrared camera, 72 surface mating events were distinctly recorded between 11.30 PM and 02.15 AM over two nights, demonstrating the technique's suitability for observing shad mating activity. The video analysis revealed that the monitored A. fallax population exhibited similar mating behaviour to other European shads (e.g., Alosa alosa). This study provides useful insights to develop novel management approaches for preserving or restoring the spawning habitat of the A. fallax, supporting its conservation. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ecohydrology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/eco.70010
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      – Code: eng
        Text: English
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        PageCount: 17
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    Subjects:
      – SubjectFull: Habitat selection
        Type: general
      – SubjectFull: Anadromous fishes
        Type: general
      – SubjectFull: Animal sexual behavior
        Type: general
      – SubjectFull: Infrared cameras
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      – SubjectFull: Random forest algorithms
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    Titles:
      – TitleFull: Mesohabitat Spawning Preference of the Anadromous Twaite Shad (Alosa fallax, Lacépède 1803) in the Tagliamento River (Italy).
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              Text: Jan2025
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