Action

Create walls or barriers to exclude pollutants

How is the evidence assessed?
  • Effectiveness
    35%
  • Certainty
    29%
  • Harms
    0%

Study locations

Key messages

  • One controlled study in Mexico found that installing filters across canals to improve water quality and exclude fish increased weight gain in axolotls.

 

About key messages

Key messages provide a descriptive index to studies we have found that test this intervention.

Studies are not directly comparable or of equal value. When making decisions based on this evidence, you should consider factors such as study size, study design, reported metrics and relevance of the study to your situation, rather than simply counting the number of studies that support a particular interpretation.

Supporting evidence from individual studies

  1. A controlled study in 2009 of canals within agricultural land in Xochimilco, Mexico (Valiente et al. 2010) found that installing filters to improve water quality and exclude competitive fish increased weight gain in axolotls Ambystoma mexicanum. Only four of 12 previously marked axolotls were recaptured; however, their weight had increased by 16%. Weight gain was greater than that of axolotls in control colonies over the same period. After four months, water was significantly lower in ammonia (77%), nitrates (87%) and turbidity (15%) compared to control canals. Working with farmers in 2009, a canal used as a refuge by axolotls was isolated from the main system using filters made of wood to exclude fish and improve water quality. Farmers benefited from improved farm products with the improved water quality and the protection of traditional agriculture.

    Study and other actions tested
Please cite as:

Smith, R.K., Meredith, H. & Sutherland, W.J. (2020) Amphibian Conservation. Pages 9-64 in: W.J. Sutherland, L.V. Dicks, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2020. Open Book Publishers, Cambridge, UK.

Where has this evidence come from?

List of journals searched by synopsis

All the journals searched for all synopses

Amphibian Conservation

This Action forms part of the Action Synopsis:

Amphibian Conservation
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

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