TY - JOUR A1 - Gemeinholzer, B. A1 - May, F. A1 - Ristow, Michael A1 - Batsch, C. A1 - Lauterbach, D. T1 - Strong genetic differentiation on a fragmentation gradient among populations of the heterocarpic annual Catananche lutea L. (Asteraceae) JF - Plant systematics and evolution N2 - In landscapes which are predominately characterised by agriculture, natural ecosystems are often reduced to a mosaic of scattered patches of natural vegetation. Species with formerly connected distribution ranges now have restricted gene flow among populations. This has isolating effects upon population structure, because species are often confined by their limited dispersal capabilities. In this study, we test the effects of habitat fragmentation, precipitation, and isolation of populations on the genetic structure (AFLP) and fitness of the Asteraceae Catananche lutea. Our study area is an agro-dominated ecosystem in the desert-Mediterranean transition zone of the Southern Judea Lowlands in Israel. Our analysis revealed an intermediate level of intra-population genetic diversity across the study site with reduced genetic diversity on smaller scale. Although the size of the whole study area was relatively small (20 x 45 km), we found isolation by distance to be effective. We detected a high level of genetic differentiation among populations but genetic structure did not reflect spatial patterns. Population genetic diversity was correlated neither with position along the precipitation gradient nor with different seed types or other plant fitness variables in C. lutea. KW - AFLP KW - Heterocarpy KW - Population structure KW - Precipitation gradient KW - Asteraceae Y1 - 2012 U6 - https://doi.org/10.1007/s00606-012-0661-1 SN - 0378-2697 VL - 298 IS - 8 SP - 1585 EP - 1596 PB - Springer CY - Wien ER - TY - JOUR A1 - Audisio, Paolo A1 - Cline, Andrew R. A1 - Solano, Emanuela A1 - Mancini, Emiliano A1 - Lamanna, Francesco A1 - Antonini, Gloria A1 - Trizzino, Marco T1 - A peculiar new genus and species of pollen-beetle (Coleoptera, Nitidulidae) from eastern Africa, with a molecular phylogeny of related Meligethinae JF - Systematics and biodiversity KW - new species KW - new genus KW - molecular analysis KW - pollen-beetles KW - host-plants KW - Asteraceae KW - Kenya KW - Tarchonanthopria freidbergi Y1 - 2014 U6 - https://doi.org/10.1080/14772000.2013.877539 SN - 1477-2000 SN - 1478-0933 VL - 12 IS - 1 SP - 77 EP - 91 PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - JOUR A1 - Eilers, Elisabeth Johanna A1 - Kleine, Sandra A1 - Eckert, Silvia A1 - Waldherr, Simon A1 - Müller, Caroline T1 - Flower production, headspace volatiles, pollen nutrients, and florivory in tanacetum vulgare chemotypes JF - Frontiers in plant science : FPLS N2 - Floral volatiles and reward traits are major drivers for the behavior of mutualistic as well as antagonistic flower visitors, i.e., pollinators and florivores. These floral traits differ tremendously between species, but intraspecific differences and their consequences on organism interactions remain largely unknown. Floral volatile compounds, such as terpenoids, function as cues to advertise rewards to pollinators, but should at the same time also repel florivores. The reward composition, e.g., protein and lipid contents in pollen, differs between individuals of distinct plant families. Whether the nutritional value of rewards within the same plant species is linked to their chemotypes, which differ in their pattern of specialized metabolites, has yet not been investigated. In the present study, we compared Tanacetum vulgare plants of five terpenoid chemotypes with regard to flower production, floral headspace volatiles, pollen macronutrient and terpenoid content, and floral attractiveness to florivorous beetles. Our analyses revealed remarkable differences between the chemotypes in the amount and diameter of flower heads, duration of bloom period, and pollen nutritional quality. The floral headspace composition of pollen-producing mature flowers, but not of premature flowers, was correlated to that of pollen and leaves in the same plant individual. For two chemotypes, florivorous beetles discriminated between the scent of mature and premature flower heads and preferred the latter. In semi-field experiments, the abundance of florivorous beetles and flower tissue miners differed between T. vulgare chemotypes. Moreover, the scent environment affected the choice and beetles were more abundant in homogenous plots composed of one single chemotype than in plots with different neighboring chemotypes. In conclusion, flower production, floral metabolic composition and pollen quality varied to a remarkable extend within the species T. vulgare, and the attractiveness of floral scent differed also intra-individually with floral ontogeny. We found evidence for a trade-off between pollen lipid content and pollen amount on a per-plant-level. Our study highlights that chemotypes which are more susceptible to florivory are less attacked when they grow in the neighborhood of other chemotypes and thus gain a benefit from high overall chemodiversity. KW - terpenoids KW - gas chromatography-mass spectrometry (GC-MS) KW - Asteraceae KW - protein KW - lipid-ratio KW - insect behavior KW - Phalacridae KW - chemodiversity Y1 - 2021 U6 - https://doi.org/10.3389/fpls.2020.611877 SN - 1664-462X VL - 11 PB - Frontiers Media CY - Lausanne ER -