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Population variation in the intensity of fruit infestation and pre-dispersal seed predation in Yucca schidigera (Asparagaceae) by its obligate pollinator

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Abstract

Variation in the occurrence and the intensity of pre-dispersal seed predation can help understand ecological and evolutionary dynamics of plant populations. Pre-dispersal seed predation can vary in intensity, resulting in costs that differ in magnitude among populations. We examined variation in the cost of pre-dispersal seed predation across nine Yucca schidigera populations, by quantifying yucca moth infestation, damage on fertile seeds and seed mass in 650 fruits sampled from 73 Yucca plants. We recorded Tegeticula mojavella larvae on 100% of the Y. schidigera plants. Across populations, mean infestation rates ranged from 2.9 to 6.11 larvae per fruit. Despite slight variation in the level of fruit infestation, predation on mature seeds differed among the nine populations, ranging from 10 to 26%. Mean seed mass and germination rate differed among populations, but the effect of larvae infestation on these traits was not significant. Altogether, our results demonstrate that infestation and pre-dispersal seed predation by yucca moths differ significantly across populations of Y. schidigera. Variable ratios of seed predation result in different costs across plant populations, despite experiencing similar infestation ratios. It seems that, regardless of its spatial distribution, the interaction between Y. schidigera and T. mojavella is dependent on local ecological factors that regulate oviposition and seed predation.

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Fig. 1

(modified from Turner et al. 2005)

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Data availability

Our dataset is available using the https://doi.org/10.6084/m9.figshare.7215014

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Acknowledgements

This manuscript constitutes a partial requirement for the doctoral dissertation of L. De la Rosa-Conroy at the Life Sciences Graduate Program in CICESE. We thank Sula Vanderplank, PhD for helpful comments on an earlier version of this manuscript, and E. López and M. Salazar for assisting with sample collection. We also thank Juan Cons and the students at Genética Ecológica Lab (UABC) and Genética de la Conservación Lab (CICESE) for participating in fieldwork and fruit dissections during 2015–2018.

Funding

Dr. Maria Clara Arteaga received funding from CONACYT (Project No. CB-2014-01-238843) and CICESE (Project No. 681-114); Dr. Rafael Bello-Bedoy received funding from CONACYT (Project No. INFRA2015_226239); and Leonardo De la Rosa-Conroy received a doctoral scholarship from CONACYT (Grant No. 19713).

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All authors contributed equally to the preparation of this manuscript. MCA directed the project, MCA and RBB conceived the study, LDC and RBB contributed with sample collection and data analysis, LDC and RBB wrote the first draft of the manuscript, and MCA, SBH, and LEF contributed with the overall preparation of the manuscript and with interpretation of the results.

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Correspondence to Rafael Bello-Bedoy.

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The authors declare that they have no conflicts of interest.

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Communicated by Philip Ladd.

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De la Rosa-Conroy, L., Arteaga, M.C., Bullock, S.H. et al. Population variation in the intensity of fruit infestation and pre-dispersal seed predation in Yucca schidigera (Asparagaceae) by its obligate pollinator. Plant Ecol 220, 711–720 (2019). https://doi.org/10.1007/s11258-019-00946-9

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