Journal of Pollination Ecology <div id="ConnectiveDocSignExtentionInstalled" data-extension-version="1.0.4"> <p><span style="font-family: Verdana; color: black;">The</span><span style="font-family: Verdana; color: black;"> Journal of Pollination Ecology (ASBL) </span><span style="font-family: Verdana; color: black;">is a non-profit, </span><span style="font-family: Verdana; color: black;">o</span><span style="font-family: Verdana; color: black;">pen access, </span><span style="font-family: Verdana; color: black;">peer-reviewed </span><span style="font-family: Verdana; color: black;">journal that aims to promote the exchange of original knowledge and research in any area of pollination and pollinator behaviour.</span></p> <p><span style="font-family: Verdana; color: black;">The associated </span><span style="font-family: Verdana; color: black;"><a href="" target="_blank" rel="noopener">Pollination Magazine </a></span> publishes short lay summaries of all articles published in JPE. You can also find interesting stories about pollination there.</p> </div> en-US <p>JPE is an open access journal which means that all content is freely available without charge to the user or his/her institution.</p> <p>Authors who publish with this journal agree to the following terms:</p> <p>1) Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a <a href="" target="_blank" rel="noopener">Creative Commons Attribution License</a> that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.</p> <p>2) Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.</p> <p>3) Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See <a href="" target="_new">The Effect of Open Access</a>).</p> <p>To assure a broader targeted audience, content will be included into databases (such as EBSCO) and directories (such as DOAJ).</p> (JPE senior editors) (Technical Support Contact - Managing Editor) Fri, 31 Dec 2021 00:00:00 -0800 OJS 60 Tomato (Solanum lycopersicum) specialized pollination is isolated from neighboring plants and pollinators <p>Tomato is one of the crops that require buzz pollination, for which a pollinator vibrates the tubular anthers for pollen to be released. This process is efficiently carried out by wild bees, whose distribution varies according to the geographical location and the particular characteristics of the different agroecosystems. The pollination network associated with tomato fields located in an agricultural area of ​​ Cuba was determined by field observations. In addition, it was studied whether pollination influences tomato yield, through exclusion experiments and comparing the characteristics of the fruits obtained in the presence or absence of pollinators. The pollination network consisted of 241 interactions between 12 plants, including tomato, adjacent crops such as papaya and pumpkin, and ruderal species, and 11 floral visitors, fundamentally bees, with 5 species involved. Tomato flowers were almost exclusively visited by the bee species <em>Exomalopsis pulchella</em>, capable of buzz pollination. Species of the genus <em>Exomalopsis</em> are frequent pollinators of tomato in the Neotropic. This denotes a temporary specialization in the use of tomato´s floral resources by <em>Exomalopsis pulchella</em>. <em>Apis mellifera</em> was not detected visiting tomato flowers, despite being present in the pollination network associated with the studied agroecosystem. Pollination significantly increased the dimensions of tomato fruits. <em>Exomalopsis pulchella</em> also visited the ruderal plants <em>Asteraceae</em> sp., <em>Commelinaceae</em> sp. and <em>Milleria quinqueflora</em>. This should be taken into account in the management of the ruderal plant communities that surround the tomato fields, in order to promote and guarantee the presence of the main pollinator of this crop.</p> Rijo Gabriela, Alameda Diego, Barro Alejandro Copyright (c) 2022 Rijo Gabriela, Alameda Diego, Barro Alejandro Tue, 03 May 2022 00:00:00 -0700 The distributions of insect, wind and self pollination of plants in the Netherlands in relation to habitat types and 3D vegetation structure <p>Plants can be pollinated in many ways, with insect, wind and selfing as the most common modes. While it seems likely that the occurrence of pollination modes is correlated with environmental conditions, e.g. vegetation structure, and this remains uncertain. Here, we mapped the composition of pollination modes of different plant groups (woody species, herbs, and grasses) across (semi-)natural habitats and their distributions in relation to 3D vegetation structure in the Netherlands. We found insect pollination is the most common mode across (semi-)natural habitats for woody species and herbs. Woody species pollinated by insects showed an even higher percentage in dune, river swamp and swamp peat than in other habitat types, whereas herbs showed a higher percentage of insect pollination in dune than in other habitat types. Grasses were always pollinated by wind or wind-self in all habitats. Woody plants pollinated by wind showed a positive relationship with canopy densities in three different strata from 2 to 20 m vegetation, while insect pollination showed a positive relationship with the canopy density of 0.5 to 2 m vegetation. All grass presented negative relationships with canopy density. Herbs showed different relationships with canopy densities of different strata dependent on pollination modes. Insect-pollinated species increased with canopy densities of low strata but decreased with canopy density of high strata, whereas wind-pollinated species decreased with canopy density of both low and high strata. We conclude that habitat and vegetation structure are important factors driving the distribution of pollination modes.</p> Kaixuan Pan, Leon Marshall, Koos Biesmeijer, Geert R. de Snoo Copyright (c) 2022 Kaixuan Pan, Leon Marshall, Koos Biesmeijer, Geert R. de Snoo Wed, 20 Apr 2022 00:00:00 -0700 Hawaiian Endemic Honeycreepers (Drepanidinae) are Nectar Robbers of the Invasive Banana Poka (Passiflora tarminiana, Passifloraceae) <p>The human transport and subsequent naturalization of species outside their natural ranges has led to novel interactions between introduced and native species throughout the world. Understanding how introduced species impact pollination networks is useful for both invasive species management and native species conservation and restoration. Banana poka (<em>Passiflora tarminiana</em>), a hummingbird pollinated liana native to South America, has naturalized in higher elevation forests on the islands of Kauaʻi, Maui and Hawaiʻi in the Hawaiian archipelago, habitats in which endemic honeycreepers still occur. To develop an understanding of the interaction between banana poka and honeycreepers, we undertook a floral visitation study at Hakalau Forest National Wildlife Refuge on the island of Hawaiʻi where three nectivorous honeycreepers and banana poka co-occur. Two honeycreeper species, ʻiʻiwi (<em>Drepanis coccinea</em>) and Hawaiʻi ʻamakihi (<em>Chlorodrepanis virens</em>), nectar robbed all of the banana poka flowers that they visited, ostensibly due to the length of the corolla tubes (60–90 mm long) which physically inhibits both honeycreeper species from accessing nectar via the mouth of the corolla. In addition, the standing crop and sugar composition of banana poka floral nectar were assessed. Flowers produced large standing crops (375 ± 132 μL) of nectar containing 29.1 ± 1% (w/v) of sugar that was sucrose-dominant (mean: 95.6 ± 0.5% sucrose in each sample). Our observations suggest that the floral nectar of banana poka may form a substantial component of the diet of both honeycreeper species at the study site. Further research is needed to understand how infestations of banana poka affect bird pollination networks at this and other sites in Hawaiʻi.</p> Seana Walsh, Richard Pender, Noah Gomes Copyright (c) 2022 Seana Walsh, Richard Pender, Noah Gomes Wed, 20 Apr 2022 00:00:00 -0700 Pollen tube growth in Calotropis procera is controlled by environmental changes: does it have an impact on delayed fertilization? <p><em>Calotropis procera</em> (Apocynaceae) is a Sudanian plant that grows throughout the eastern Saharo-Arabian region. In Israel, it grows along the Rift Valley under extremely hot and dry climatic conditions. In <em>C. procera</em>, as in many other Apocynaceae, the nectar is secreted in the flowers from the nectaries located inside the stigmatic chamber, with the excess flowing via the capillary system into special reservoirs (cucculi). The nectar has two functions: it is used as a reward to attract pollinating insects and it serves as the germination medium for pollen grains. Under natural conditions the nectar concentration is subjected to a large variability, ranging from 22-68% sucrose. The aim of this study was to elucidate the effects of the natural fluctuations of nectar concentration on pollen germination and pollen tube growth, and their possible role in delaying fertilization in <em>Calotropis procera</em>.</p> <p>We followed the process of pollen germination under various experimental sucrose concentrations simulating the nectar. We found that the optimal concentration of a sucrose medium for pollen germination is 20%. However, if the already-germinated pollen grains are subjected to high sucrose concentration for different periods of time (between one and three hours), elongation of the pollen tubes is inhibited. In all the experimental groups, the pollen tubes renewed their elongation following a reduction of the sucrose. In conclusion, we found that <em>C. procera</em> pollen grains’ germination is able to adjust to the large fluctuations in sucrose concentration, caused by the changes in temperature and relative humidity conditions of the plant’s habitat during the day. This phenomenon probably enables postponing the fertilization towards a time of better conditions and enables the plant to retain the pollen tubes alive, albeit inactive, and thus allow the plant to overcome temporary harsh conditions and develop seeds.</p> Adina Mishal, Dan Eisikowitch Copyright (c) 2022 Dan Eisikowitch, Adina Mishal Fri, 25 Feb 2022 00:00:00 -0800 Sending private messages: Floral ultraviolet signals are correlated with pollination syndromes in Erica <p>The presence of ultraviolet (UV, wavelengths between 300-400 nm) reflectance in insect-pollinated flowers has been linked to pollination efficiency and pollination shifts, but little is known about its prevalence and function in other pollination systems and African species. We chose the genus <em>Erica</em> for studying the prevalence of UV because of its extreme radiation (c. 680 species) in the Cape, South Africa, with a diversity of pollination syndromes. This study quantified the prevalence and brightness of UV reflectance for five <em>Erica</em> pollination syndromes and tested pollinator preferences for UV reflectance in the two groups with the highest prevalence: sunbirds and long-proboscid flies. Our results show that UV colouration is absent or rare in <em>Erica </em>species pollinated by unclassified insects, rodents or wind. About 17 % of bird-pollinated species reflected UV but choice experiments revealed that free-ranging sunbirds showed no preference for UV signals. All sampled long-proboscid fly-pollinated species reflected UV and its experimental removal decreased seed set drastically, suggesting that long-proboscid flies in the Cape strongly prefer or depend on UV and thereby contributed to selecting for the evolution of this signal.</p> <div id="ConnectiveDocSignExtentionInstalled" data-extension-version="1.0.4"> </div> Samantha McCarren, Jeremy Midgley, Anina Coetzee Copyright (c) 2021 Samantha McCarren, Jeremy Midgley, Anina Coetzee Wed, 22 Dec 2021 00:00:00 -0800 A functional view reveals substantial predictability of pollinator-mediated selection <p>A predictive understanding of adaptation to changing environments hinges on a mechanistic understanding of the extent and causes of variation in natural selection. Estimating variation in selection is difficult due to the complex relationships between phenotypic traits and fitness, and the uncertainty associated with individual selection estimates. Plant-pollinator interactions provide ideal systems for understanding variation in selection and its predictability, because both the selective agents (pollinators) and the process linking phenotypes to fitness (pollination) are generally known. Through examples from the pollination literature, I discuss how explicit consideration of the functional mechanisms underlying trait-performance relationships can clarify the relationship between traits and fitness, and how variation in the ecological context that generates selection can help disentangle biologically important variation in selection from sampling variation. I then evaluate the predictability of variation in pollinator-mediated selection through a survey, reanalysis, and synthesis of results from the literature. The synthesis demonstrates that pollinator-mediated selection often varies substantially among trait functional groups, as well as in time and space. Covariance between patterns of selection and ecological variables provides additional support for the biological importance of observed selection, but the detection of such covariance depends on careful choice of relevant predictor variables as well as consideration of quantitative measurements and their meaning, an aspect often neglected in selection studies.</p> Øystein Opedal Copyright (c) 2021 Øystein Opedal Wed, 22 Dec 2021 00:00:00 -0800