Manage perennial bioenergy crops to benefit butterflies and moths

Overall effectiveness category Awaiting assessment
Number of studies: 1
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Background information and definitions

Bioenergy crops are grown to produce oil, which is used as fuel in place of traditional fossil fuel derivatives. Perennial bioenergy crops, such as grasses, can be sown once and harvested for multiple years, which creates opportunities to establish grassland ecosystems, unlike annual cropping systems. Management of perennial bioenergy crops to benefit butterflies and moths may include changing the mix of seeds planted, altering the timing or frequency of harvest, or limiting the application of chemicals to the crop.

Studies on annual bioenergy crops are included within actions for annual crops, for example “Increase crop diversity across a farm or farmed landscape”, “Plant more than one crop per field (intercropping)”, “Leave uncropped, cultivated margins or plots” and “Leave unharvested crop headlands within arable fields”. For studies which test reductions in chemical application alone, see “Threat: Pollution”.

Study locations

Key messages

One study evaluated the effects on butterflies and moths of managing perennial bioenergy crops to benefit butterflies and moths. This study was in the USA.

COMMUNITY RESPONSE (1 STUDY)

Richness/diversity (1 study): One replicated, controlled study in the USA found that plots planted with a diverse mix of bioenergy crops had a greater species richness of butterflies than plots planted with fewer species.

POPULATION RESPONSE (1 STUDY)

Abundance (1 study): One replicated, controlled study in the USA found that plots planted with a diverse mix of bioenergy crops had a higher abundance of butterflies than plots planted with fewer species.

BEHAVIOUR (0 STUDIES)

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

A replicated, controlled study in 2009–2010 on an arable farm in Iowa, USA (Myers et al. 2012) found that plots planted with a diverse mix of bioenergy crops had a higher abundance and species richness of butterflies than plots with a restricted range of grass species. On plots sown with 16 or 32 plant species, both the abundance (4–8 individuals/50 m) and species richness (3–5 species/month) of butterflies were higher than on plots sown with one or five plant species (abundance: 1–3 individuals/50 m; richness: 1–3 species/month). The difference was consistent across sandy loam, loam and clay loam soils. See paper for individual species results. In May 2009, forty-eight 0.30–0.56 ha plots were established across seven fields (3.7–6.1 ha) previously sown with soybean on a 40-ha farm. In each plot, one of four native seed mixes was sown: switchgrass Panicum virgatum monoculture, “warm-season mix” (five grasses), “biomass mix” (16 grasses, legumes and non-woody, broadleaved plants “forbs”), or “prairie mix” (32 grasses, legumes, forbs and sedges). There were four replicates of each mix on each of three soil types: sandy loam, loam and clay loam. All plots were mown to 10 cm height in July 2009. From June–September 2010, butterflies were surveyed along one 50-m transect/plot twice during each of five survey periods.
Study and other actions tested
Referenced paper
Myers M.C., Hoksch B.J. & Mason J.T. (2012) Butterfly response to floral resources during early establishment at a heterogeneous prairie biomass production site in Iowa, USA. Journal of Insect Conservation, 16, 457-472.

Please cite as:

Bladon A.J., Bladon, E. K., Smith R.K. & Sutherland W.J. (2023) Butterfly and Moth Conservation: Global Evidence for the Effects of Interventions for butterflies and moths. Conservation Evidence Series Synopsis. University of Cambridge, Cambridge, UK.

Where has this evidence come from?

List of journals searched by synopsis

All the journals searched for all synopses

This Action forms part of the Action Synopsis:

Butterfly and Moth Conservation

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Manage perennial bioenergy crops to benefit butterflies and moths Action Link	Awaiting assessment	1	Synopsis Link