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Germination of native and exotic seeds dispersed by wild black-and-gold howler monkeys (Alouatta caraya): assessing deinhibition and scarification effects

  • Darío M. FergnaniEmail author
  • Martín M. Kowalewski
  • Vanina A. Fernández
Original Article

Abstract

Fruit ingestion by frugivores and the subsequent passage of seeds through their digestive tract can influence seed germination patterns. The removal of germination inhibitors contained in the fruit pulp (deinhibition effect), and/or the abrasion of the seed coat (scarification effect), can modify the probability and speed of seed germination. We followed seven groups of black-and-gold howler monkeys (Alouatta caraya) in northeastern Argentina between November 2012 and January 2013 to study the effect of seed passage through the howler monkeys’ gut on seed germination. For three native and one exotic species, we compared the proportion of germination and germination times among seeds in three different treatments: gut-passed seeds (GP), manually extracted seeds from fruits (ME), and seeds in intact fruits (IF). Paired comparisons between treatments allowed us to assess the overall effect of seed passage (total effect without distinguishing individual effects, GP vs. IF), deinhibition effect (ME vs. IF), and scarification effect (GP vs. ME). Our results suggest that passage through the howler monkeys’ gut enhances seed germination by an increase in the proportion of germinated seeds and/or by a reduction in germination times. We found that deinhibition enhanced germination in three out of the four studied species, while scarification enhanced germination in one and decreased germination in another species. Our work highlights that gut passage may affect seed germination by different mechanisms, and all of these mechanisms should be considered in germination studies. It also emphasizes the importance of A. caraya as a seed disperser in northeastern Argentina, showing the high quality of the treatment provided to seeds.

Keywords

Gut passage Frugivory Germination experiment Forest regeneration Seed swallowing 

Notes

Acknowledgements

Our research was supported by the National Council of Scientific and Technical Research (CONICET), Argentina (PIP IU 0355). We gratefully acknowledge the help of our field assistants Fernando Mingrone and Ruby Valls. We thank Corrientes Biological Station for allowing us to use their facilities for this study. We thank Sahana Kuthyar and Alberto Fameli for proofreading the article. MK thanks Bruno K for helping him to disperse seeds. The study complies with the current laws of Argentina and followed the Argentine Society for Mammalian Studies guidelines.

Funding

This study was funded by the National Council of Scientific and Technical Research (CONICET) (PIP IU 0355).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Human rights and animal participants

This article does not contain any studies with human participants.

Ethical approval

Our research was purely observational and non-invasive. It complies with the current laws of Argentina and followed the Argentine Society for Mammalian Studies guidelines (Giannoni et al. 2003).

Supplementary material

10329_2020_791_MOESM1_ESM.docx (26 kb)
Supplementary file1 (DOCX 25 kb)

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Copyright information

© Japan Monkey Centre and Springer Japan KK, part of Springer Nature 2020

Authors and Affiliations

  1. 1.Grupo de Genética y Ecología en Conservación y Biodiversidad (GECoBi)Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”Ciudad Autónoma de Buenos AiresArgentina
  2. 2.Estación Biológica CorrientesMuseo Argentino de Ciencias Naturales “Bernardino Rivadavia”CorrientesArgentina
  3. 3.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Ciudad Autónoma de Buenos AiresArgentina

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