Publicaciones

@article{Cuevas-Reyes2017,

title = {Effects of herbivory and mistletoe infection by Psittacanthus calyculatus on nutritional quality and chemical defense of Quercus deserticola along Mexican forest fragments},

author = {Pablo Cuevas-Reyes and Griselda Pérez-López and Yurixhi Maldonado-López and Antonio González-Rodríguez},

doi = {10.1007/s11258-017-0721-2},

issn = {15735052},

year  = {2017},

date = {2017-01-01},

journal = {Plant Ecology},

volume = {218},

issue = {6},

pages = {687-697},

abstract = {Mistletoes are parasitic plants that show effects that can parallel or contrast with those caused by herbivores to their host plants, particularly on aspects such as host biomass, resource allocation patterns, and interspecific interactions at the community level. In this study, we evaluated the potential synergistic effects of herbivory and infection by the mistletoe Psittacanthus calyculatus on nutritional quality and chemical defense of the white oak Quercus deserticola along forest fragments in Mexico. For this, we sampled leaves of parasitized oaks, unparasitized oaks and mistletoes at four forest fragments in the Cuitzeo basin, Michoacán state, Mexico, and measured herbivory levels and foliar water content, total nonstructural carbohydrates, phenols, flavonoids, and hydrolyzable tannins in each sample. Higher levels of infection by P. calyculatus were found in the smaller forest fragments, while foliar damage by herbivores was higher in larger forest fragments. At all sites, levels of herbivory were lower in the mistletoe than in both parasitized and unparasitized oaks. However, there was a positive relationship between herbivory levels in parasitized oaks and their mistletoes. Also, foliar water content and total phenol concentration were positively correlated between the oaks and the mistletoes. The results suggest that herbivory levels in parasitized hosts and mistletoes depend on the close physiological interaction between the nutritional quality and the chemical defense of the two plants involved. This is one of the few studies analyzing the chemical ecology of the interaction between plant hosts and plant parasites.},

keywords = {Chemical defense, Forest fragmentation, Herbivory, Mistletoes, Nutritional quality, Plant–plant interactions},

pubstate = {published},

tppubtype = {article}

}

@article{Oyama2017,

title = {Gene flow interruption in a recently human-modified landscape: The value of isolated trees for the maintenance of genetic diversity in a Mexican endemic red oak},

author = {Ken Oyama and María Luisa Herrera-Arroyo and Víctor Rocha-Ramírez and Julieta Benítez-Malvido and Eduardo Ruiz-Sánchez and Antonio González-Rodríguez},

url = {http://dx.doi.org/10.1016/j.foreco.2017.01.018},

doi = {10.1016/j.foreco.2017.01.018},

issn = {03781127},

year  = {2017},

date = {2017-01-01},

journal = {Forest Ecology and Management},

volume = {390},

pages = {27-35},

publisher = {Elsevier B.V.},

abstract = {Gene flow within and among populations is an important factor to maintain genetic cohesiveness and diversity across landscapes. Nowadays, human land use has led to a large forest conversion, creating many fragmented areas where remnant trees play an important role in conserving biodiversity. In this study, we analyzed the effects of a recent anthropogenic forest fragmentation on the genetic diversity and genetic heterogeneity of pollen pools accepted by individuals of the red oak Quercus castanea growing in forest patches and as isolated trees in central Mexico. Pollen movement was also evaluated by the analysis of outcrossing rates using seven nuclear microsatellites. We assumed that adult trees are remnants of the populations that existed previous to the forest fragmentation, while progenies of these trees are the result of recent reproductive events occurring after the fragmentation. We found high genetic diversity in both adult trees and progenies, even though progenies of isolated trees showed a significant reduction in heterozygosity as compared to their mother trees. However, the results of TWOGENER and mating system analyses indicated similar numbers of pollen donors in the progenies of mother trees from fragments and in isolated trees. Overall, our results suggest that gene flow is still extensive among forest fragments and isolated trees, conferring them a great value for the conservation of genetic diversity and connectivity.},

keywords = {Forest fragmentation, gene flow, Genetic diversity, Isolated trees, Outcrossing rates, Quercus castanea},

pubstate = {published},

tppubtype = {article}

}

@article{Arroyo-Rodriguez2017,

title = {Parent-parent and parent-offspring distances in Spondias radlkoferi seeds suggest long-distance pollen and seed dispersal: Evidence from latrines of the spider monkey},

author = {Víctor Arroyo-Rodríguez and Esther Aguilar-Barajas and Arturo González-Zamora and Víctor Rocha-Ramírez and Antonio González-Rodríguez and Ken Oyama},

doi = {10.1017/S0266467417000050},

issn = {14697831},

year  = {2017},

date = {2017-01-01},

journal = {Journal of Tropical Ecology},

volume = {33},

issue = {2},

pages = {95-106},

abstract = {Pollen and seed dispersal are key ecological processes, directly impacting the spatial distribution, abundance and genetic structure of plant populations; yet, pollen- and seed-dispersal distances are poorly known. We used molecular markers to identify the parental origin (n = 152 adult trees) of 177 Spondias radlkoferi (Anacardiaceae) seeds deposited by the spider monkey (Ateles geoffroyi) in latrines located beneath 17 sleeping-trees in two continuous forest sites (CF) and two forest fragments (FF) in the Lacandona rain forest, Mexico. We estimated mean parent-offspring (PO) distances per latrine and, for those seeds (54% of seeds) with more than one candidate parent (i.e. the potential maternal and parental parents), we also estimated parent-parent (PP) distances per latrine, and tested if PO and PP distances differed between forest types. Global PO and PP distances per latrine averaged 682 m (range = 83-1741 m) and 610 m (range = 74-2339 m), respectively, and did not differ significantly between CF and FF. This suggests that pollen dispersal is extensive in both forest types and that long seed dispersal distances (>100 m) are common, thus supporting the hypothesis that the spider monkey is an effective seed disperser of S. radlkoferi in continuous and fragmented forests.},

keywords = {Ateles, Forest fragmentation, Lacandona, Parental analysis, Pollen dispersal, Seed dispersal effectiveness},

pubstate = {published},

tppubtype = {article}

}

@article{Herrera-Arroyo2013,

title = {Seed-mediated connectivity among fragmented populations of Quercus castanea (Fagaceae) in a Mexican landscape},

author = {M. Luisa Herrera-Arroyo and Victoria L. Sork and Antonio González-Rodríguez and Víctor Rocha-Ramírez and Ernesto Vega and Ken Oyama},

doi = {10.3732/ajb.1200396},

issn = {00029122},

year  = {2013},

date = {2013-01-01},

journal = {American Journal of Botany},

volume = {100},

issue = {8},

pages = {1663-1671},

abstract = {Premise of study: Anthropogenic fragmentation is an ongoing process in many forested areas that may create loss of connectivity among tree populations and constitutes a serious threat to ecological and genetic processes. We tested the central hypothesis that seed dispersal mitigates the impact of fragmentation by comparing connectivity and genetic diversity of adult vs. seedling populations in recently fragmented populations of the Mexican red oak Quercus castanea. Methods: Adult individuals, established before fragmentation, and seedlings, established after fragmentation, were sampled at 33 forest fragments of variable size (0.2 to 294 ha) within the Cuitzeo basin, Michoacán state, and genotyped using seven highly polymorphic chloroplast microsatellite markers (cpSSRs). To test whether seed dispersal retains connectivity among fragmented populations, we compared genetic diversity and connectivity networks between adults and progeny and determined the effect of fragment size on these values. • Key results: Seventy haplotypes were identified, 63 in the adults and 60 in the seedlings, with average within-population diversity (h S) values of 0.624 in the adults and 0.630 in the seedlings. A positive correlation of genetic diversity values with fragment size was found in the seedling populations but not in the adult populations. The network connectivity analysis revealed lower connectivity among seedling populations than among adults. The number of connections (edges) as well as other network properties, such as betweenness centrality, node degree and closeness, were significantly lower in the seedlings network. • Conclusions: Habitat fragmentation in this landscape is disrupting seed-dispersal-mediated genetic connectivity among extant populations. © 2013 Botanical Society of America.},

keywords = {Chloroplast dna, Fagaceae, Forest fragmentation, genetic connectivity, genetic variation, Microsatellites, Quercus castanea},

pubstate = {published},

tppubtype = {article}

}