1
|
Campbell DR, Bischoff M, Raguso RA, Briggs HM, Sosenski P. Selection of Floral Traits by Pollinators and Seed Predators during Sequential Life History Stages. Am Nat 2022; 199:808-823. [DOI: 10.1086/716740] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Diane R. Campbell
- Department of Ecology and Evolutionary Biology, University of California, Irvine, California 92617
- Rocky Mountain Biological Laboratory, Crested Butte, Colorado 81224
| | - Mascha Bischoff
- Rocky Mountain Biological Laboratory, Crested Butte, Colorado 81224
- Environmental Research Institute, North Highland College, Castle Street, Thurso KW14 7JD, United Kingdom
| | - Robert A. Raguso
- Department of Neurobiology and Behavior, Cornell University, Ithaca, New York 14853
| | - Heather M. Briggs
- Department of Ecology and Evolutionary Biology, University of California, Irvine, California 92617
- Rocky Mountain Biological Laboratory, Crested Butte, Colorado 81224
| | - Paula Sosenski
- Department of Ecology and Evolutionary Biology, University of California, Irvine, California 92617
- Rocky Mountain Biological Laboratory, Crested Butte, Colorado 81224
- Consejo Nacional de Ciencia y Tecnología (CONACYT)–Departamento de Ecología Tropical, Universidad Autónoma de Yucatán, Mérida, Yucatán, Mexico
| |
Collapse
|
2
|
Parra-Tabla V, Angulo-Pérez D, Albor C, Campos-Navarrete MJ, Tun-Garrido J, Sosenski P, Alonso C, Ashman TL, Arceo-Gómez G. The role of alien species on plant-floral visitor network structure in invaded communities. PLoS One 2019; 14:e0218227. [PMID: 31703061 PMCID: PMC6839871 DOI: 10.1371/journal.pone.0218227] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Accepted: 10/23/2019] [Indexed: 11/18/2022] Open
Abstract
The interactions between pairs of native and alien plants via shared use of pollinators have been widely studied. Community level studies however, are necessary in order to fully understand the factors and mechanisms that facilitate successful plant invasion, but these are still scarce. Specifically, few community level studies have considered how differences in invasion level (alien flower abundance), and degree of floral trait similarity between native and invasive species, mediate effects on native plant-pollinator communities. Here, we evaluated the role of alien species on overall plant-floral visitor network structure, and on species-level network parameters, across nine invaded coastal communities distributed along 205 km in Yucatán, México that vary in alien species richness and flower abundance. We further assessed the potential the role of alien plant species on plant-floral visitor network structure and robustness via computational simulation of native and invasive plant extinction scenarios. We did not find significant differences between native and alien species in their functional floral phenotypes or in their visitation rate and pollinator community composition in these invaded sites. Variation in the proportion of alien plant species and flower abundance across sites did not influence plant-pollinator network structure. Species-level network parameters (i.e., normalized degree and nestedness contribution) did not differ between native and alien species. Furthermore, our simulation analyses revealed that alien species are functionally equivalent to native species and contribute equally to network structure and robustness. Overall, our results suggest that high levels of floral trait similarity and pollinator use overlap may help facilitate the integration of alien species into native plant-pollinator networks. As a result, alien species may also play a similar role than that of natives in the structure and stability of native plant and pollinator communities in the studied coastal sand dune ecosystem.
Collapse
Affiliation(s)
- Víctor Parra-Tabla
- Departamento de Ecología Tropical, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán,Mérida, Yucatán, México
- * E-mail:
| | - Diego Angulo-Pérez
- Departamento de Ecología Tropical, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán,Mérida, Yucatán, México
| | - Cristopher Albor
- Departamento de Ecología Tropical, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán,Mérida, Yucatán, México
| | - María José Campos-Navarrete
- División de Estudios de Posgrado e Investigación, Instituto Tecnológico de Tizimín, Tecnológico Nacional de México,Tizimín, Yucatán, México
| | - Juan Tun-Garrido
- Departamento de Botánica, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Paula Sosenski
- Departamento de Ecología Tropical, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán,Mérida, Yucatán, México
| | - Conchita Alonso
- Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas (CSIC), Avda, Sevilla, Spain
| | - Tia-Lynn Ashman
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, United States of America
| | - Gerardo Arceo-Gómez
- Department of Biological Sciences, East Tennessee State University, Johnson City, TN, United States of America
| |
Collapse
|
3
|
Suárez-Mariño A, Arceo-Gómez G, Sosenski P, Parra-Tabla V. Patterns and effects of heterospecific pollen transfer between an invasive and two native plant species: the importance of pollen arrival time to the stigma. Am J Bot 2019; 106:1308-1315. [PMID: 31553505 DOI: 10.1002/ajb2.1361] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 07/26/2019] [Indexed: 06/10/2023]
Abstract
PREMISE Invasive plant species can integrate into native plant-pollinator communities, but the underlying mechanisms are poorly understood. Competitive interactions between invasive and native plants via heterospecific pollen (HP) and differential invasive HP effects depending on HP arrival time to the stigma may mediate invasion success, but these have been little studied. METHODS We evaluated patterns and effects of HP receipt on pollen tube growth in two native and one invasive species in the field. We also used hand-pollination experiments to evaluate the effect of invasive HP pollen and its arrival time on native reproductive success. RESULTS Native species receive smaller and less-diverse HP loads (5-7 species) compared to invasive species (10 species). The load size of HP had a negative effect on the proportion of pollen tubes in both native species but not in the invasive, suggesting higher HP tolerance in the latter. Invasive HP arrival time differentially affected pollen tube success in native species. CONCLUSIONS Our results highlight the need to study reciprocal HP effects between invasive and native species and the factors that determine differential responses to HP receipt to fully understand the mechanisms facilitating invasive species integration into native plant-pollinator communities.
Collapse
Affiliation(s)
- Alexander Suárez-Mariño
- Departamento de Ecología Tropical, Campus de Ciencias Biológicas and Agropecuarias, Universidad Autónoma de Yucatán, Km 15.5 Carretera Mérida-Xtmakuil, Mérida Yucatán, México, 97000
| | - Gerardo Arceo-Gómez
- Department of Biological Sciences, East Tennessee State University, Johnson City, TN, 37614, USA
| | - Paula Sosenski
- Departamento de Ecología Tropical, Campus de Ciencias Biológicas and Agropecuarias, Universidad Autónoma de Yucatán, Km 15.5 Carretera Mérida-Xtmakuil, Mérida Yucatán, México, 97000
| | - Víctor Parra-Tabla
- Departamento de Ecología Tropical, Campus de Ciencias Biológicas and Agropecuarias, Universidad Autónoma de Yucatán, Km 15.5 Carretera Mérida-Xtmakuil, Mérida Yucatán, México, 97000
| |
Collapse
|
4
|
Campbell DR, Sosenski P, Raguso RA. Phenotypic plasticity of floral volatiles in response to increasing drought stress. Ann Bot 2019; 123:601-610. [PMID: 30364929 PMCID: PMC6417471 DOI: 10.1093/aob/mcy193] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 10/04/2018] [Indexed: 05/20/2023]
Abstract
BACKGROUND AND AIMS Flowers emit a wide range of volatile compounds which can be critically important to interactions with pollinators or herbivores. Yet most studies of how the environment influences plant volatiles focus on leaf emissions, with little known about abiotic sources of variation in floral volatiles. Understanding phenotypic plasticity in floral volatile emissions has become increasingly important with globally increasing temperatures and changes in drought frequency and severity. Here quantitative relationships of floral volatile emissions to soil water content were analysed. METHODS Plants of the sub-alpine herb Ipomopsis aggregata and hybrids with its closest congener were subjected to a progressive dry down, mimicking the range of soil moistures experienced in the field. Floral volatiles and leaf gas exchange were measured at four time points during the drought. KEY RESULTS As the soil dried, floral volatile emissions increased overall and changed in composition, from more 1,3-octadiene and benzyl alcohol to higher representation of some terpenes. Emissions of individual compounds were not linearly related to volumetric water content in the soil. The dominant compound, the monoterpene α-pinene, made up the highest percentage of the scent mixture when soil moisture was intermediate. In contrast, emission of the sesquiterpene (E,E)-α-farnesene accelerated as the drought became more intense. Changes in floral volatiles did not track the time course of changes in photosynthetic rate or stomatal conductance. CONCLUSIONS This study shows responses of specific floral volatile organic compounds to soil moisture. The non-linear responses furthermore suggest that extreme droughts may have impacts that are not predictable from milder droughts. Floral volatiles are likely to change seasonally with early summer droughts in the Rocky Mountains, as well as over years as snowmelt becomes progressively earlier. Changes in water availability may have impacts on plant-animal interactions that are mediated through non-linear changes in floral volatiles.
Collapse
Affiliation(s)
- Diane R Campbell
- Department of Ecology and Evolutionary Biology, University of California, Irvine, CA, USA
- Rocky Mountain Biological Laboratory, Crested Butte, CO, USA
- For correspondence. E-mail
| | - Paula Sosenski
- Department of Ecology and Evolutionary Biology, University of California, Irvine, CA, USA
- Rocky Mountain Biological Laboratory, Crested Butte, CO, USA
- CONACYT – Departamento de Ecología Tropical, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Robert A Raguso
- Department of Neurobiology and Behavior, Cornell University, Ithaca, NY, USA
| |
Collapse
|
5
|
|
6
|
Baena-Díaz F, Fornoni J, Sosenski P, Weller SG, Domínguez CA. Pollen and stigma size changes during the transition from tristyly to distyly in Oxalis alpina (Oxalidaceae). Plant Biol (Stuttg) 2017; 19:994-1002. [PMID: 28834046 DOI: 10.1111/plb.12615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 08/17/2017] [Indexed: 06/07/2023]
Abstract
Pollen and stigma size have the potential to influence male fitness of hermaphroditic plants, particularly in species presenting floral polymorphisms characterised by marked differences in these traits among floral morphs. In this study, we take advantage of the evolutionary transition from tristyly to distyly experienced by Oxalis alpina (Oxalidaceae), and examined whether modifications in the ancillary traits (pollen and stigma size) respond to allometric changes in other floral traits. Also, we tested whether these modifications are in accordance with what would be expected under the hypothesis that novel competitive scenarios (as in distylous-derived reproductive system) exert morph- and whorl-specific selective pressures to match the available stigmas. We measure pollen and stigma size in five populations of O. alpina representing the tristyly-distyly transition. A general reduction in pollen and stigma size occurred along the tristyly-distyly transition, and pollen size from the two anther levels within each morph converged to a similar size that was characterised by whorl-specific changes (increases or decreases) in pollen size of different anthers in each floral type. Overall, results from this study show that the evolution of distyly in this species is characterised not only by changes in sexual organ position and flower size, but also by morph-specific changes in pollen and stigma size. This evidence supports the importance of selection on pollen and stigma size, which increase fitness of remaining morphs following the evolution of distyly, and raises questions to explore on the functional value of pollen size in heterostylous systems under pollen competition.
Collapse
Affiliation(s)
- F Baena-Díaz
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - J Fornoni
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - P Sosenski
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - S G Weller
- Department of Ecology and Evolutionary Biology, University of California, Irvine, CA, USA
| | - C A Domínguez
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, Mexico
| |
Collapse
|
7
|
Sosenski P, Ramos SE, Domínguez CA, Boege K, Fornoni J. Pollination biology of the hexaploid self-compatible species Turnera velutina (Passifloraceae). Plant Biol (Stuttg) 2017; 19:101-107. [PMID: 27770594 DOI: 10.1111/plb.12518] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 10/19/2016] [Indexed: 06/06/2023]
Abstract
The evolution of monomorphisms from heterostylous ancestors has been related to the presence of homostyly and the loss of self-incompatibility, allowing the occurrence of selfing, which could be advantageous under pollinator limitation. However, flowers of some monomorphic species show herkogamy, attraction and rewarding traits that presumably favour cross-pollination and/or a mixed mating system. This study evaluated the contributions of pollinators, breeding system and floral traits to the reproduction of Turnera velutina, a herkogamous monomorphic species. Floral visitors and frequency of visits were recorded, controlled hand cross-pollinations were conducted under greenhouse and natural conditions, and individual variation in floral traits was characterised to determine their contribution to seed production. Apis mellifera was the most frequent floral visitor. Flowers presented approach herkogamy, high variation in nectar features, and a positive correlation of floral length with nectar volume and sugar concentration. Seed production did not differ between manual self- and cross-pollinations, controls or open cross-pollinations, but autonomous self-pollination produced, on average, 82.74% fewer seeds than the other forms, irrespective of the level of herkogamy. Differences in seed production among autonomous self-pollination and other treatments showed that T. velutina flowers depend on insect pollination for reproduction, and that approach herkogamy drastically reduced seed production in the absence of pollen vectors. The lack of differences in seed production from manual cross- and self-pollinations suggests the possible presence of a mixed mating system in the studied population. Overall, this species was possibly derived from a distylous ancestor but appears fully capable of outcrossing despite being monomorphic.
Collapse
Affiliation(s)
- P Sosenski
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, México, Distrito Federal, México
| | - S E Ramos
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, México, Distrito Federal, México
| | - C A Domínguez
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, México, Distrito Federal, México
| | - K Boege
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, México, Distrito Federal, México
| | - J Fornoni
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, México, Distrito Federal, México
| |
Collapse
|
8
|
Sosenski P, Fornoni J, Molina-Freaner FE, Weller SG, Domínguez CA. Changes in sexual organ reciprocity and phenotypic floral integration during the tristyly-distyly transition in Oxalis alpina. New Phytol 2010; 185:829-840. [PMID: 19968800 DOI: 10.1111/j.1469-8137.2009.03105.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Although the 6 magnitude and pattern of correlation among floral traits (phenotypic integration) is usually conceived as an adaptation for successful pollination and reproduction, studies on the evolution of plant reproductive systems have generally focused on one or a few characters. If evolutionary transitions between reproductive systems involve morphological floral adjustments, changes in the magnitude and pattern of phenotypic integration of floral traits may be expected. In this study, we focused on the evolutionary dynamics of a complex adaptive trait, the extent of reciprocity (reciprocal placement) among sexual organs in a heterostylous species, and explored the associated changes in phenotypic floral integration during the transition from tristyly to distyly. The extent of reciprocity and both the magnitude and pattern of floral integration were characterized in 12 populations of Oxalis alpina representing the tristyly-distyly gradient. Although the extent of reciprocity increased along the tristyly-distyly transition, the flower size diminished. These adjustments did not affect the magnitude, but did affect the pattern, of floral integration. *Changes in the pattern of floral integration suggested that allometric, functional and pleiotropic relationships among floral traits were affected during this evolutionary transition.
Collapse
Affiliation(s)
- Paula Sosenski
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Apartado Postal 70-275, CP 04510, México Distrito Federal, México
| | | | | | | | | |
Collapse
|