Jan David Heuschele

• Heuschele, Jan David; Andersen, Tom; Walseng, Bjørn & Hessen, Dag Olav (2023). Assessing climatic and spatial variables influencing zooplankton richness for space-for-time predictions. Freshwater Biology. ISSN 0046-5070. 69(1), s. 64–73. doi: 10.1111/fwb.14193. Fulltekst i vitenarkiv Vis sammendrag

  1. The macroecological drivers of freshwater diversity are accredited geographical, spatial and climatic variables, but also to productivity, ecosystem age and landscape history. Locally diversity is also influenced by the dispersal ability of species. Here we evaluated how spatial and climatic variables influence species richness and macroecological patterns in Cladocera and Copepoda. We also discuss whether a space-for-time approach is suitable to predict the community's response to the current rapid warming of lakes. 2. We use the presence-absence of pelagic and littoral microcrustaceans in 1465 Norwegian lakes with a wide range of latitudinal, longitudinal, and altitudinal gradients, as well as a wide span in lake areas, to evaluate how spatial and climatic factors influence zooplankton diversity in two major groups: Cladocera and Copepoda. 3. Longitude and latitude per se were poor predictors of zooplankton richness, but a combination of spatial and ecological predictors gave a good spatial prediction of cladoceran and copepod richness. These two groups did, however, not differ in their spatial distribution, with a strikingly fixed proportion of copepods close to 0.3, suggesting no obvious Allee- effects regarding the mode of reproduction (asexual vs sexual). 4. Since temperature alone was a poor predictor of species richness for both groups and dispersal constraints can make it very difficult to estimate a new richness equilibrium under a future climate, space-for-time predictions may have limited value for assessing future patterns of microcrustacean diversity. 5. Based on a quite unique dataset in terms of the sheer number of sites, spatial gradients, and inclusion of littoral species, our study demonstrates that assessments on how changing climate will shape and modulate zooplankton communities in the future are problematic. biogeography, dispersal, diversity, lakes, micro-crustaceans

• Broch, Catharina & Heuschele, Jan David (2023). Zoobooth: A portable, open-source and affordable approach for repeated size measurements of live individual zooplankton. Heliyon. ISSN 2405-8440. 9(5). doi: 10.1016/j.heliyon.2023.e15383. Fulltekst i vitenarkiv
• Valiente Parra, Nicolas; Eiler, Alexander; Allesson, Lina; Andersen, Tom; Clayer, Francois & Crapart, Camille Marie [Vis alle 13 forfattere av denne artikkelen] (2022). Catchment properties as predictors of greenhouse gas concentrations across a gradient of boreal lakes. Frontiers in Environmental Science. ISSN 2296-665X. 10. doi: 10.3389/fenvs.2022.880619. Fulltekst i vitenarkiv
• Heuschele, Jan David; Lode, Torben; Konestabo, Heidi Sjursen; Titelman, Josefin; Andersen, Tom & Borgå, Katrine (2022). Drivers of copper sensitivity in copepods: A meta-analysis of LC50s. Ecotoxicology and Environmental Safety. ISSN 0147-6513. 242. doi: 10.1016/j.ecoenv.2022.113907. Fulltekst i vitenarkiv
• Trapp, Aubrey; Heuschele, Jan David & Selander, Erik (2021). Eavesdropping on plankton—can zooplankton monitoring improve forecasting of biotoxins from harmful algae blooms? . Limnology and Oceanography. ISSN 0024-3590. 66(9), s. 3455–3471. doi: 10.1002/lno.11891. Fulltekst i vitenarkiv
• Jager, Tjalling; Heuschele, Jan David; Lode, Torben & Borgå, Katrine (2021). Analysing individual growth curves for the copepod Tigriopus brevicornis, while considering changes in shape. Journal of Sea Research. ISSN 1385-1101. 174(102075). doi: 10.1016/j.seares.2021.102075. Fulltekst i vitenarkiv
• Lode, Torben; Heuschele, Jan David; Andersen, Tom; Titelman, Josefin; Hylland, Ketil & Borgå, Katrine (2021). Density-Dependent Metabolic Costs of Copper Exposure in a Coastal Copepod. Environmental Toxicology and Chemistry. ISSN 0730-7268. 40(9), s. 2538–2546. doi: 10.1002/etc.5141. Fulltekst i vitenarkiv
• Kaartvedt, Stein; Ugland, Karl I.; Heuschele, Jan David & Solberg, Ingrid (2021). Coordinated gas release among the physostomous fish sprat (Sprattus sprattus). Scientific Reports. ISSN 2045-2322. 11(1). doi: 10.1038/s41598-021-92585-2. Fulltekst i vitenarkiv Vis sammendrag

  Previous experimental studies suggest that the production of sound associated with expelling gas from an open swimbladder may play a role in communication. This would suggest non-random gas release. We used deployed echosounders to study patterns of gas release among a ford population of sprat (Sprattus sprattus). The echosounder records concurrently revealed individual fsh and their release of gas. The gas release primarily occurred at night, partly following recurrent temporal patterns, but also varying between nights. In testing for non-randomness, we formulated a datadriven simulation approach. Non-random gas release scaled with the length of the analyzed time intervals from 1 min to 6 h, and above 30 min the release events in more than 50% of the intervals were signifcantly connected.

• Heuschele, Jan David; Lode, Torben; Andersen, Tom & Titelman, Josefin (2020). The Hidden Dimension: Context‐Dependent Expression of Repeatable Behavior in Copepods . Environmental Toxicology and Chemistry. ISSN 0730-7268. 39(5), s. 1017–1026. doi: 10.1002/etc.4688. Fulltekst i vitenarkiv
• Lode, Torben; Heuschele, Jan David; Andersen, Tom; Titelman, Josefin; Hylland, Ketil & Borgå, Katrine (2020). Contrasting Effects of Predation Risk and Copper on Copepod Respiration Rates. Environmental Toxicology and Chemistry. ISSN 0730-7268. 39(9), s. 1765–1773. doi: 10.1002/etc.4804. Fulltekst i vitenarkiv
• Heuschele, Jan David; Lode, Torben; Andersen, Tom; Borgå, Katrine & Titelman, Josefin (2019). An affordable and automated imaging approach to acquire highly resolved individual data—an example of copepod growth in response to multiple stressors. PeerJ. ISSN 2167-8359. 7, s. 1–22. doi: 10.7717/peerj.6776. Fulltekst i vitenarkiv
• Sahlmann, Andrea Silke; Lode, Torben; Heuschele, Jan David; Borgå, Katrine; Titelman, Josefin & Hylland, Ketil (2019). Genotoxic Response and Mortality in 3 Marine Copepods Exposed to Waterborne Copper. Environmental Toxicology and Chemistry. ISSN 0730-7268. 38(10), s. 2224–2232. doi: 10.1002/etc.4541.
• Lode, Torben; Heuschele, Jan David; Andersen, Tom; Titelman, Josefin; Hylland, Ketil & Borgå, Katrine (2018). Predation Risk Potentiates Toxicity of a Common Metal Contaminant in a Coastal Copepod. Environmental Science and Technology. ISSN 0013-936X. 52(22), s. 13535–13542. doi: 10.1021/acs.est.8b03685.
• Wolf, Raoul & Heuschele, Jan David (2018). Water Browning Influences the Behavioral Effects of Ultraviolet Radiation on Zooplankton. Frontiers in Ecology and Evolution. ISSN 2296-701X. 6, s. 1–8. doi: 10.3389/fevo.2018.00026. Fulltekst i vitenarkiv
• Selander, Erik; Heuschele, Jan David & Larsson, Ann I. (2017). Hydrodynamic properties and distribution of bait downstream of a zooplankton trap. Journal of Plankton Research. ISSN 0142-7873. 39(6), s. 1020–1027. doi: 10.1093/plankt/fbx024.
• Heuschele, Jan David; Ekvall, Mikael T.; Bianco, Giuseppe; Hylander, Samuel & Hansson, Lars-Anders (2017). Context-dependent individual behavioral consistency in Daphnia. Ecosphere. ISSN 2150-8925. 8:e01679(2), s. 1–9. doi: 10.1002/ecs2.1679.
• Heuschele, Jan David; Ekvall, Mikael T.; Mariani, Patrizio & Lindemann, Christian (2017). On the missing link in ecology: improving communication between modellers and experimentalists. Oikos. ISSN 0030-1299. 126(8), s. 1071–1077. doi: 10.1111/oik.03885.
• Heuschele, Jan David; Nemming, Louise; Tolstrup, Lea; Kiørboe, Thomas; Nylund, Göran M. & Selander, Erik (2016). The sex specific metabolic footprint of Oithona davisae. Journal of Sea Research. ISSN 1385-1101. 117, s. 1–6. doi: 10.1016/j.seares.2016.09.004.
• Selander, Erik; Heuschele, Jan David; Nylund, Göran M.; Pohnert, Georg; Pavia, Henrik & Bjærke, Oda [Vis alle 8 forfattere av denne artikkelen] (2016). Solid phase extraction and metabolic profiling of exudates from living copepods. PeerJ. ISSN 2167-8359. 2016(1), s. 1–18. doi: 10.7717/peerj.1529.
• Heuschele, Jan David; Ceballos, Sara; Andersen Borg, Christian Marc; Bjærke, Oda; Isari, Stamatina & Lasley-Rasher, Rachel [Vis alle 10 forfattere av denne artikkelen] (2014). Non-consumptive effects of predator presence on copepod reproduction: insights from a mesocosm experiment. Marine Biology. ISSN 0025-3162. 161(7), s. 1653–1666. doi: 10.1007/s00227-014-2449-z.
• Sainmont, Julie; Gislason, Astthor; Heuschele, Jan David; Webster, Clare N.; Sylvander, Peter & Wang, Miao [Vis alle 7 forfattere av denne artikkelen] (2014). Inter- and intra-specific diurnal habitat selection of zooplankton during the spring bloom observed by Video Plankton Recorder. Marine Biology. ISSN 0025-3162. 161, s. 1931–1941. doi: 10.1007/s00227-014-2475-x.
• Heuschele, Jan David; Eliassen, Sigrunn & Kiørboe, Thomas (2013). Optimal mate choice patterns in pelagic copepods. Oecologia. ISSN 0029-8549. 172(2), s. 399–408. doi: 10.1007/s00442-012-2516-4.
• Heuschele, Jan David & Kiørboe, Thomas (2012). The smell of virgins: mating status of females affects male swimming behaviour in Oithona davisae. Journal of Plankton Research. ISSN 0142-7873. 34(11), s. 929–935. doi: 10.1093/plankt/fbs054.
• Heuschele, Jan David; Salminen, Tiina & Candolin, Ulrika (2012). Habitat change influences mate search behaviour in three-spined sticklebacks. Animal Behaviour. ISSN 0003-3472. 83(6), s. 1505–1510. doi: 10.1016/j.anbehav.2012.03.027.

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• Heuschele, Jan David; Lode, Torben; Bruserud, Hilde; Brochmann, Solveig; Dingstad, Trym R & Wolf, Raoul [Vis alle 7 forfattere av denne artikkelen] (2023). Development of splash pool populations under copper and predation risk exposure in field conditions.
• Borgå, Katrine; McKinney, Melissa A.; Giebichenstein, Julia; Dinh, van Khuong; Bårnås Gravelle, Amalie Marie & Heuschele, Jan David [Vis alle 10 forfattere av denne artikkelen] (2023). The influence of climate change on accumulation and toxicity of pollutants in Arctic marine food webs.
• Heuschele, Jan David; Lode, Torben; Bruserud, Hilde; Brochmann, Solveig; Røil Dingstad, Trym & Wolf, Raoul [Vis alle 7 forfattere av denne artikkelen] (2023). The population development of splash pool organisms under copper and predation risk exposure in field conditions.
• Lode, Torben; Dingstad, Trym R; Heuschele, Jan David & Borgå, Katrine (2022). Effect of historic aquaculture activity on copepod sensitivity to combined copper and predation risk exposure.
• Heuschele, Jan David; Dinh, Khuong V.; Lode, Torben; Jager, Tjalling & Borgå, Katrine (2022). Copper sensitivity in three common Arctic copepods. .
• Wolf, Raoul; Heuschele, Jan David; Wagner, Martin & Tollefsen, Knut-Erik (2019). Promoting data literacy to improve statistics in ecotoxicology.
• Lindemann, Christian & Heuschele, Jan David (2018). From peers to public: Obstacles, benefits and impact of cross-methodological communication.
• Vindenes, Yngvild; Broch, Catharina & Heuschele, Jan David (2018). Når oppveksten styres av temperatur - bidrag til Forskningstorget 2018. Vis sammendrag

  For de aller fleste dyr på jorda, er lengden på barndommen ikke et spørsmål om alder alene, men om hvor kaldt eller varmt miljøet i oppveksten har vært. For 99% av alle dyr på jorda er det temperaturen som bestemmer hvor raskt livsklokken tikker. Blant disse dyrene finner vi dafnier (vannlopper) som lever i små og store dammer der temperaturen kan skifte raskt og mye. Kom til vår bod og regn ut din egen dafnie-alder, hils på kalde og varme dafnier, og lær mer om hvordan temperatur påvirker lengden på barndommen og levealderen til disse dyrene.

• Tran, Jacquelynn Phuong-Vy; Edvardsen, Bente; Fon, Mathias; Heuschele, Jan David & Titelman, Josefin (2023). When hungry meets harmful: investigating the toxic relationship between haptophytes and copepods. Predatory induced defenses in Chrysochromulina leadbeateri. . Universitetet i Oslo. Vis sammendrag

  Harmful algal blooms are a recurring phenomenon all around the world, causing devastating effects including massive fish kills. A bloom of the toxic haptophyte, Chrysochromulina leadbeateri, in Northern Norway during May-June 2019 was the largest bloom ever recorded in that area causing massive mortalities of farmed salmon. While past C. leadbeateri blooms are known to cause such damage, relatively little is known about this toxic haptophyte, compared to other species. Some studies have investigated the bloom dynamics and abiotic factors influencing its toxicity, but little is known about the biotic influences. In particular, the predator-prey interactions with copepods. Past studies have found that when other species are directly exposed to predation threats (e.g. herbivorous copepods), the algae will respond by inducing and/or increasing toxicity potential as a defense mechanism. Those studies have focused on toxic diatoms and dinoflagellates producing shellfish toxins, but the potential for fish-killing algae to be influenced by predation pressure remains to be explored. In this thesis, I examined the biotic interactions between the toxic C. leadbeateri and the grazing Acartia sp. copepods. I first conducted a series of 3-day tolerance experiments, exposing Acartia sp. to different C. leadbeateri concentrations to answer: What is the threshold C. leadbeateri concentration that Acartia sp. can maintain survival and grazing? Then I conducted 3-day induction experiments, exposing C. leadbeateri to varying levels of grazing pressure, and in vitro tests using two fish cell lines to measure this potential grazing-induced toxicity to answer: Does the presence of copepod grazers affect toxicity in the ichthyotoxic haptophyte C. leadbeateri? Through the initial tolerance experiments, I determined that ca. 5 x 104 cells ml-1 of C. leadbeateri was the threshold concentration that enough Acartia sp. could survive and maintain feeding for the later toxicity induction experiments. Acartia sp. short-term tolerance to direct exposure to C. leadbeateri appeared to be concentration and time-dependent since the toxins need to be taken up by Acartia sp. to cause mortalities. Copepod grazing habits observed during the induction experiment appeared unaffected when C. leadbeateri was the only food source, as evidenced by fecal pellet production. However to accurately determine the effects of grazing on C. leadbeateri, future studies should observe grazing periodically with Acartia sp. exposed to different C. leadbeateri concentrations and non-toxic food alternatives. I examined whether the toxicity of C. leadbeateri was influenced by the presence of grazing copepods using in vitro tests on two fish (Rainbow trout and Atlantic salmon) cell lines to measure cell viability and light microscopy to look at morphological changes. I created different concentrations of algal extracts from crude C. leadbeateri material exposed to varying grazing levels. The different extracts were exposed to the gill cells in a microplate-based assay for 24 hours and at the endpoint, cell viability was measured using Alamar blue as an indicator dye. It seems that while increasing algal extract concentration decreases cell viability, extract made from C. leadbeateri exposed to increasing grazing pressure does not increase the negative effects on cell viability. The light micrographs of the gill cells suggest the same, but with some inclination that grazing pressure does affect some toxicity potential in C. leadbeateri. Unfortunately, with the lack of more independent trials, there is no statistical analyses to back up these claims. More experiments would allow for proper analyses and a potentially more conclusive statement about the relationship between copepod grazing and the toxicity potential of C. leadbeateri. This thesis can be used as a starting point for future research on the dynamics between toxic haptophytes and their copepod grazers.

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