What Worker Bees Reveal About Pollution Across Southern Italy

The full story

What Happened? [1]

Researchers examined worker honey bees (Apis mellifera) from four environmental settings in Calabria, southern Italy: two protected mountain-forest sites in Sila National Park, one suburban site, and one urban site. They tested for pesticide residues and trace elements, including rare earth elements. [1]

The bees showed different chemical patterns from place to place. Most targeted pesticide residues were below the laboratory’s quantification limits, but one fungicide, ametoctradin, was detected at one protected-site location. Element patterns also varied strongly by site, including higher reported levels of several metals in urban bees and greater rare-earth-element diversity and concentrations at one protected Natura 2000 site. [1]

Why Should We Care? [1]

Honey bees forage across the surrounding landscape and encounter materials from more than one environmental pathway. That makes their bodies potentially useful as an integrated record of local exposure—not a replacement for direct air, soil, water, or food testing, but one possible additional monitoring tool. [1]

This study also offers a useful caution against simple assumptions: a protected place was not automatically the site with the lowest measured concentrations of every element. Local geology, nearby land use, and where individual bees forage may all matter. [1]

What Did the Researchers Find?

The researchers compared worker honey bees from four sites in Calabria, southern Italy: two protected montane forests, one suburban setting, and one urban setting. [1]
They targeted 778 agrochemicals and 46 trace elements using laboratory chemical-analysis methods. [1]
Most targeted pesticide residues were below quantification limits; ametoctradin, a fungicide, was the reported exception at protected site S2. [1]
Urban-site bees showed significant enrichment in lead, nickel, chromium, and selenium, while suburban-site bees had higher barium, manganese, arsenic, and zinc. [1]
Bees from protected site S2 had the highest reported diversity and concentrations of rare earth elements among the sampled sites. [1]
The study reported substantial variation among individual bees in accumulated elements, which the authors describe as important for interpreting bee-based monitoring. [1]

How Do We Know? [1]

The team chemically analyzed worker honey bees for a broad panel of pesticides and trace elements. The paper reports gas- and liquid-chromatography tandem mass spectrometry for pesticide testing, inductively coupled plasma mass spectrometry for element testing, and statistical analyses to compare chemical patterns among sites. [1]

The public scholarly record provides the study abstract and bibliographic details, including an online-publication date of July 1, 2026. The journal issue is scheduled for October 1, 2026. [1]

What Doesn’t This Study Prove?

Four places are not every landscape This was a comparison of four sites in one region of southern Italy. It does not establish that the same element patterns will occur in other cities, farms, forests, countries, or seasons. [1]

Chemical patterns do not prove a single source The authors describe urban metal patterns as consistent with traffic-related emissions and interpret the protected-site rare earth element pattern as suggesting both geological and agricultural influences. These are plausible interpretations, not direct proof that one named source caused each measurement. [1]

Below quantification is not the same as absent For most targeted pesticides, the result was below the laboratory’s quantification limit. That does not prove that every compound was completely absent, only that it was not quantified at the reported method threshold. [1]

This was not a bee-health or human-health trial The reported work measured chemical residues and elements in bees. It does not by itself show that the detected patterns caused harm to bees, other wildlife, or people. [1]

Bee monitoring complements rather than replaces direct testing Because bees integrate exposures encountered while foraging, their chemical profiles cannot alone identify concentrations in a particular air, water, soil, nectar, or pollen sample. [1]

Where Did This Research Come From?

Research Record

Original Study: Honey bees as integrative bioindicators of environmental pollution: Trace elements and pesticide residues across different environmental contexts
Authors: Anita Giglio; Maria Luigia Vommaro; Rosangela Elliani; Antonio Tagarelli; Attilio Naccarato
Journal: Environmental Pollution
Publisher: Elsevier Ltd.
Publication: 2026-07-01
Honey Chronicles Timeline Date: Online publication: July 1, 2026
Online Publication Date: 2026-07-01
Journal Issue Date: 2026-10-01
Volume: 406
Pages / Article: 128680
Species Studied: Apis mellifera
Research Location / Affiliations: Calabria, southern Italy; Department of Biology, Ecology and Earth Science, University of Calabria, Rende, Italy; Department of Chemistry and Chemical Technologies, University of Calabria, Rende, Italy.
DOI: 10.1016/j.envpol.2026.128680