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Phenotypic plasticity of common wasps in an industrially polluted environment in southwestern Finland

Sorvari Jouni; Badejo Oluwatobi; Carrasco‐Navarro Victor; Skaldina Oksana; Peräniemi Sirpa

Phenotypic plasticity of common wasps in an industrially polluted environment in southwestern Finland

Sorvari Jouni
Badejo Oluwatobi
Carrasco‐Navarro Victor
Skaldina Oksana
Peräniemi Sirpa
Katso/Avaa
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MDPI
doi:10.3390/insects12100888
URI
https://www.mdpi.com/2075-4450/12/10/888
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021110554166
Tiivistelmä

Insects vary in the degree of their adaptability to environmental contamination. Determining the responses with phenotypic plasticity in ecologically important species in polluted environments will ease further conservation and control actions. Here, we investigated morphological characteristics such as body size, body mass, and color of the common wasp Vespula vulgaris in an industrially polluted environment, considering different levels of metal pollution, and we studied the localization of contaminants in the guts of wasps. We revealed some differences in morphological characteristics and melanization of wasps collected in habitats with high, moderate, and low levels of pollution. The results indicated that V. vulgaris from highly polluted environments had reduced melanin pigmentation on the face but increased melanin pigmentation on the 2nd tergite of the abdomen. In addition, with transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX), we found metal particles from the midgut of wasps originating from the polluted environment. Most of the particles were encapsulated with melanin pigment. This finding confirmed that in wasps, ingested metal particles are accumulated in guts and covered by melanin layers. Our data suggest that wasps can tolerate metal contamination but respond phenotypically with modification of their size, coloration, and probably with the directions of the melanin investments (immunity or coloration). Thus, in industrially polluted areas, wasps might probably survive by engaging phenotypic plasticity with no significant or visible impact on the population.

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