Effects of manganese on chemically induced food search behaviour of the Norway lobster, Nephrops norvegicus (L.)
Abstract
The decapod Norway lobster, Nephrops norvegicus (L.), lives on muddy sediments rich in manganese (Mn). In hypoxic conditions, manganese is reduced and released from the sediment, so increased concentrations of dissolved Mn(2+) become bioavailable. In excess, manganese acts as a neurotoxin and may inhibit vital functions of benthic organisms, such as muscle contraction. We investigated in a laboratory flume experiment, the effect of environmentally realistic concentrations of manganese (0.1 and 0.2mM for 12 days) on the food search behaviour of N. norvegicus. We found that lobsters exposed to manganese had a more than doubled reaction time to food odour stimuli compared to the controls (p<0.05). In addition, manganese exposure reduced the number of N. norvegicus reaching the food stimuli source. Compared to the controls where 86% reached the stimuli source, only about half of the lobsters exposed to 0.1mM Mn and one-third of the lobsters exposed to 0.2mM Mn reached the stimuli source (p<0.05 and 0.001, respectively). There was no significant difference between treatments in the number of lobsters leaving their shelter or in the time from reaction until leaving the shelter and there was no difference in search time for those animals that eventually did locate the stimuli source. This study shows that environmentally realistic manganese concentrations affect parts of the food search behaviour of N. norvegicus, likely due to impaired chemosensory ability or reduced motivation for feeding. Thus, the ability of N. norvegicus to detect and find food can be reduced in areas with high manganese concentrations, with possible consequences on individual and population levels.
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Elevated manganese concentrations may contribute to neurotoxicity and altered foraging efficiency in decapods, while aluminum has been linked to immobility and reduced survival in cladocerans.
“In addition to PAHs, elevated manganese concentrations may contribute to neurotoxicity and altered foraging efficiency in decapods [76][77][78], while aluminum has been linked to immobility and reduced survival in cladocerans [79].”
From Wildfire Ash Alters Freshwater Crustacean Behavior: Disentangling the Contributions of Suspended Macroparticles and Ash‐Induced Alkalinization (2026) · cites this paper as [77]
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- Authors
- Krång, A.-S., & Rosenqvist, G.
- Affiliations
- University of Gothenburg (SE)
- Norwegian University of Science and Technology (NO)
- Corresponding author
- Krång, Anna-Sara
- Venue
- Aquatic Toxicology
- Publisher
- Elsevier BV
- Published
- 2006-06
- Volume
- 78
- Issue
- 3
- Pages
- 284-291
- ISSN
- 0166-445X (ISSN-L)
- OpenAlex
- W2028612785
- Cited by
- 48
- References
- 52
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 2 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 1 · 2019: 2 · 2018: 14 · 2017: 5 · 2016: 1 · 2015: 2 · 2014: 2 · 2013: 4 · 2012: 1
- FWCI
- 1.52
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Aquatic Toxicology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Environmental Toxicology and Ecotoxicology
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Heavy Metal Exposure and Toxicity
- Physical Sciences › Environmental Science › Ecology › Crustacean biology and ecology
- Keywords
- manganese, Norway lobster, reaction time, food motivation, neurotoxicity, hypoxia, Decapoda, benthic organisms
- MeSH terms
- Analysis of Variance, Animals, Environmental Monitoring, Feeding Behavior, Nephropidae, Male, Manganese, Time Factors, Water Pollutants, Chemical
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