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Ghost of Diadromous Fish Past: Strea...

Duarte, Goncalo Filipe Fernandes.

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Ghost of Diadromous Fish Past: Streamlining Research on Diadromous Fish Species Using Historical Data at European Scale.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Ghost of Diadromous Fish Past: Streamlining Research on Diadromous Fish Species Using Historical Data at European Scale./
Author:	Duarte, Goncalo Filipe Fernandes.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	238 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-11, Section: B.
Contained By:	Dissertations Abstracts International81-11B.
Subject:	Biological oceanography. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27841684
ISBN:	9781658447713

Ghost of Diadromous Fish Past: Streamlining Research on Diadromous Fish Species Using Historical Data at European Scale.
Duarte, Goncalo Filipe Fernandes.

Ghost of Diadromous Fish Past: Streamlining Research on Diadromous Fish Species Using Historical Data at European Scale. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 238 p.

Source: Dissertations Abstracts International, Volume: 81-11, Section: B.

Thesis (Ph.D.)--Universidade de Lisboa (Portugal), 2019.

This item must not be sold to any third party vendors.

The decline of diadromous fish species has been occurring at least since the beginning of the 20th century. In this thesis, multiple European databases on the historical distribution of diadromous fish were consulted and, acknowledging the lack of data for Portugal, the first database of Portuguese historical data for freshwater fish was created. The existence of multiple databases with distinct geographical coverage and data at different spatial scales lead to the development of an historical data framework able to deal with the limitations of historical data. Its output is a reliable and geographically broad dataset of diadromous species occurrence at the beginning of the 20th century at three spatial scales: basin, sub-basin and segment. Also, a software was developed to facilitate the acquisition of environmental and riverscape variables that can be linked with the data at the three scales. Longitudinal connectivity impairment, climate change and land use alterations are some of the most significant threats to diadromous fish species. The influence of these threats was studied performing a spatial and temporal analysis of the longitudinal connectivity impairment by large dams and, modelling the distribution of diadromous fish at the beginning of the 20th century using climate and land use variables. The longitudinal connectivity impairment of the European freshwater networks became widespread in the second half of the 20th century, and is currently more impactful for populations from basins in southern Europe. The distribution of diadromous fish species is mainly affected by climate, though the effects of land use close to river mouths may be relevant since these are critical passage and entry points for the remaining network. The framework and the software developed were key to achieve the scientific knowledge presented, and more importantly, these can be established as the structural basis for future research on diadromous fish species.

ISBN: 9781658447713Subjects--Topical Terms:

2122748
Biological oceanography.
Subjects--Index Terms:

Freshwater networks

Ghost of Diadromous Fish Past: Streamlining Research on Diadromous Fish Species Using Historical Data at European Scale.
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520 $a The decline of diadromous fish species has been occurring at least since the beginning of the 20th century. In this thesis, multiple European databases on the historical distribution of diadromous fish were consulted and, acknowledging the lack of data for Portugal, the first database of Portuguese historical data for freshwater fish was created. The existence of multiple databases with distinct geographical coverage and data at different spatial scales lead to the development of an historical data framework able to deal with the limitations of historical data. Its output is a reliable and geographically broad dataset of diadromous species occurrence at the beginning of the 20th century at three spatial scales: basin, sub-basin and segment. Also, a software was developed to facilitate the acquisition of environmental and riverscape variables that can be linked with the data at the three scales. Longitudinal connectivity impairment, climate change and land use alterations are some of the most significant threats to diadromous fish species. The influence of these threats was studied performing a spatial and temporal analysis of the longitudinal connectivity impairment by large dams and, modelling the distribution of diadromous fish at the beginning of the 20th century using climate and land use variables. The longitudinal connectivity impairment of the European freshwater networks became widespread in the second half of the 20th century, and is currently more impactful for populations from basins in southern Europe. The distribution of diadromous fish species is mainly affected by climate, though the effects of land use close to river mouths may be relevant since these are critical passage and entry points for the remaining network. The framework and the software developed were key to achieve the scientific knowledge presented, and more importantly, these can be established as the structural basis for future research on diadromous fish species.
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