Action

Action Synopsis: Bird Conservation About Actions

Can nest protection increase nest abandonment?

How is the evidence assessed?
  • Effectiveness
    not assessed
  • Certainty
    not assessed
  • Harms
    not assessed

Source countries

Key messages

  • A replicated before-and-after study from the USA found that nest abandonment increased after nest exclosures were installed. Two replicated studies in Sweden and the USA found small levels of abandonment, or non-significant increases in abandonment following nest exclosure installation.
  • A meta-analysis from the USA found that some designs of nest exclosures were more likely to lead to abandonment than others.

 

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 1992 meta-analysis (Vaske et al. 1994) analysed data from 211 nest exclosures across eight US states and three Canadian provinces to determine which factors increased or decreased the likelihood of nesting piping plovers Charadrius melodus abandoning their nests. Twenty two (10%) of the nests were abandoned, and the estimated probability of abandonment was significantly higher for exclosures with covers (12%, of 178 nests) than for uncovered exclosures (0% of 33). Exclosures without supporting posts were also more likely to be abandoned (40% of 35) compared to those with metal or wood posts (7% of 176). Exclosures with short posts (<122 cm) were more likely to be abandoned (32% of 41) than those with taller posts (122 cm: 5% of 40; >122 cm: 8% of 130). Finally, nests in Canada were more likely to be abandoned (40% of 35) than those in the north (5% of 121) or mid-Atlantic (12% of  55) USA. No factors related to exclosure construction, size, shape, fence height or depth (buried beneath the ground to prevent predators digging under), nor mesh size significantly altered the probability of nest abandonment.

    Study and other actions tested
  2. A replicated before-and-after study from 1984-90 and 1991-99 on beaches in California, USA (Neuman et al. 2004) found that nest abandonment by adult snowy plovers Charadrius alexandrinus increased in 1991-99 following the protection of 49% of nests (n = 682) with predator exclosures (1.5 m high triangular wire fences), compared to 1984-90 when none of the 728 monitored nests were protected (4% for 1984-90 vs. 8% for 1991-99). This study is also discussed in ‘Predator control not on islands’, ‘Physically protect nests with individual exclosures/barriers’ and ‘Can nest protection increase predation of adult and chick waders?’.

    Study and other actions tested
  3. A replicated, randomised and controlled trial in 2002 and 2004 at three grazed pasture sites in south-west Sweden (Isaksson et al. 2007) found that there was a slight trend towards higher nest abandonment in northern lapwing Vanellus vanellus with protected nests (truncated cone steel cages with 6.5 – 8.5 cm spacing between vertical bars and 4 x 4 cm steel netting on top), but that the trend was not significant (3 of 37 caged nests abandoned vs. 2 of 153 non-caged nests). This study is also discussed in ‘Physically protect nests with individual exclosures/barriers’ and ‘Can nest protection increase nest abandonment?’

    Study and other actions tested
  4. A replicated trial at three black tern Chlidonias niger colonies in wetlands in Maine, USA (Heath & Servello 2008) found that surrounding nests with both a chick retention fence (a 30 cm high, 1 m diameter circular fence with an overhead ‘concealment flap’ of wire covered in landscaping cloth, 15 cm off the ground) and a predator exclosure fence (1.4 m high, 4.6 m diameter) appeared to cause the abandonment of three nests (of 17) immediately after fences were erected in 2001, however, no nests were abandoned in 2002 (14 nests). This study is also discussed in ‘Use multiple barriers to protect nests’.

    Study and other actions tested
Please cite as:

Williams, D.R., Child, M.F., Dicks, L.V., Ockendon, N., Pople, R.G., Showler, D.A., Walsh, J.C., zu Ermgassen, E.K.H.J. & Sutherland, W.J. (2019) Bird Conservation. Pages 141-290 in: W.J. Sutherland, L.V. Dicks, N. Ockendon, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2019. Open Book Publishers, Cambridge, UK.

 

Where has this evidence come from?

List of journals searched by synopsis

All the journals searched for all synopses

Bird Conservation

This Action forms part of the Action Synopsis:

Bird Conservation

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, terrestrial mammals, forests, peatland and control of freshwater invasive species. More are in progress.

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