Abstract
Phylloicus (Trichoptera, Calamoceratidae) is a stream invertebrate widely distributed across Neotropical biomes, which larvae use allochthonous leaf litter as food resource and to build a case that offers protection against predation. Seasonal changes in leaf litter accumulation on the streambed may affect Phylloicus larvae due to variations in availability of food and case-building material; however, it is unclear how these two processes influence each other. We assessed how case removal affected leaf litter consumption by Phylloicus larvae from two Neotropical biomes (Amazon rainforest and Cerrado savanna), which were experimentally offered leaf litter of Goupia glabra and Maprounea guianensis (common riparian species from the rainforest and savanna biomes, respectively). Our treatments included (i) direct effect of case removal, where larvae had their case removed during the experiment; (ii) time-lag effect, where the case was removed and larvae were allowed to rebuild the case before starting the experiment; and (iii) control, where cases were not removed. Leaf litter consumption by Phylloicus was 9.16 ± 7.47 mg/mg on average, being higher in the savanna than in the rainforest experiment (possibly in relation to a higher difference between the rainforest stream temperature and the experimental temperature, which may have inhibited larval activity), and higher on M. guianensis than on G. glabra (most likely due to the higher leaf litter quality of the former species). Consumption was higher in the time-lag effect treatment than in the direct effect and control treatments, which could be explained by an increase in the larval energetic demand for case building.
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Acknowledgements
We thank two anonymous reviewers and the subject editor, Luz Boyero, for their helpful comments on the manuscript. RSR is grateful to National Council for Scientific and Technological Development (CNPq) and Chico Mendes Institute for Conservation of Biodiversity (ICMBio) in projects number 421288/2017-5 and 405290/2018-7, and the Postdoctoral scholarship number 151375/2014-3. NH is grateful to the National Council of Scientific and Technological Development—CNPq (projects number 307849/2014-7). FAPESC provided financial support to RSR. RTM received fellowships from Programa Nacional de Pós-Doutorado—PNPD/CAPES Programa de Pós-graduação em Ecologia e Evolução—PPGEE/UFG. Field sampling and experiments in Manaus were funded by INCT ADAPTA-II (CNPq/FAPEAM).
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Rezende, R.S., Bernardi, J.P., Gomes, E.S. et al. Effects of Phylloicus case removal on consumption of leaf litter from two Neotropical biomes (Amazon rainforest and Cerrado savanna). Limnology 22, 35–42 (2021). https://doi.org/10.1007/s10201-020-00628-w
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DOI: https://doi.org/10.1007/s10201-020-00628-w