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Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria

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Published on: July 20, 2017

The negative ecological impacts of a globally introduced species decrease with time since introduction.

Libor Závorka¹, Mathieu Buoro^1,2, Julien Cucherousset¹

¹Laboratoire Evolution et Diversité Biologique (EDB UMR 5174), Université de Toulouse, CNRS, ENFA, UPS, Toulouse, France.

Global Change Biology

|May 26, 2018

Summary

This summary is machine-generated.

Ecological impacts from invasive brown trout (Salmo trutta) are significant initially but decrease over time. After a century, impacts become non-significant, possibly due to native species adaptation or extinction.

Keywords:

biodiversity exotic species global anthropogenic changes global invasion salmonids

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Area of Science:

Ecology
Invasive Species Biology
Conservation Science

Background:

Biological invasions pose significant ecological threats globally.
The temporal dynamics of invasion impacts are poorly understood.
Non-native brown trout (Salmo trutta) have a long introduction history, making them a suitable model for temporal impact studies.

Purpose of the Study:

To investigate how the ecological impacts of invasive brown trout change over time since introduction.
To determine if impacts diminish and when they become non-significant.

Main Methods:

A meta-analytic approach was used to synthesize data on brown trout introductions.
Impacts were analyzed across various ecological contexts (geography, biological levels, methods).

Main Results:

Significant negative ecological impacts were observed immediately following brown trout introduction.
Impacts decreased significantly with time since introduction.
Ecological impacts became non-significant approximately one century after introduction.
Impacts were more pronounced at individual and population levels and in experimental studies.

Conclusions:

Native species rapid responses, such as adaptation or local extinction, may explain the decline in invasive species impacts over time.
Conservation efforts should not overlook the initial severe impacts of invasions, even if they diminish over extended periods.