Category Archives: Botany

Unintended consequences

Ed Yong reports on research by Jianqiang Wu of the Chinese Academy of Sciences into one of my favorite creepy plants: dodder (Cuscuta sp.). Wu’s work indicates that distinct plants parasitized by a connecting dodder vine can use it to exchange chemical signals, say, in response to herbivory.

It’s not that dodder has evolved to do this. The parasite is a generalist with unfussy taste in hosts, so it doesn’t really benefit by improving the lives of the plants it attacks. And Wu still suspects that the transmission mechanism does more harm than good, by sapping its hosts of water and nutrients. But it’s perhaps surprising that it does any good at all.

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On the island

Emily Graslie talks to Robb Telfer about his work to conserve Illinois’s only endemic flowering plant, Kankakee Mallow (Iliamna remota), to Langham Island in the Kankakee River.1

1 USDA PLANTS lists I. remota as a synonym for the more widely distributed Iliamna rivularis var. rivularis.

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Birds and botany

Duarte S. Viana et al. have published research on the importance of migratory birds as a long-distance seed dispersal mechanism.

By sampling birds caught while in migratory flight by GPS-tracked wild falcons, we show that migratory birds transport seeds over hundreds of kilometres and mediate dispersal from mainland to oceanic islands.

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A gorgeous photo of the mycoheterotrophic Allotropa virgata by Richard Droker and interpreted by Tamara Bonnemaison at Botany Photo of the Day.

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I’m looking over

An uncommon look at a common wildflower: Tamara Bonnemaison considers White Clover (Trifolum repens) at Botany POTD.

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VNPS Winter Workshop 2015

A really strong workshop, with four good speakers, hosted by Virginia Native Plant Society at the University of Richmond. A theme emerged: interactions of plants with other organisms in the landscape, be they herbivorous White-tailed Deer (Odocoileus virginianus) (as discussed by Henry Wilbur, emeritus at the University of Virginia), or pollinating Eastern Tiger Swallowtails (Papilio glauca), who pick up pollen from Flame Azalea (Rhododendron calendulaceum) on their wings (only the second such association known, as discovered by Mary Jane Epps, postdoc at North Carolina State University [her work will soon be published]), or the unexpected linkage (through soil pH) of invasive Garlic Mustard (Alliaria petiolata) and the tiny arthopods known as springtails (Collembola), brought to us by Anne Alerding of Virginia Military Institute.

For me, the most interesting talk (and most challenging to follow along with) was Karen Barnard-Kubow‘s explication of her dissertation research on the genetics of American Bellflower (Campanulastrum americanum). This species has a range from the Virginia Coastal Plain to the breadbasket Midwest. Barnard-Kubow’s work has identified distinct clades: one in the East, one or two in the Appalachian Mountains, and one in the Midwest. Cross-breeding experiments on these populations suggests that the plant might be in the process of speciation. Her work also indicates that genetic material in the plant’s chloroplasts is sometimes inherited from the male parent, rather than strictly from the female, as received wisdom has it.

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Exasperating to whom?

Cora den Hartigh brings the deliciously-colored ruby/maroon macroalga Chondracanthus exasperatus to Botany POTD.

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Today’s not his birthday, but hats off anyway to Frederick Vernon Coville, commercializer of blueberries.

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Mixed effects

A recent paper by Jason M. Gleditsch and Tomás A. Carlo explores the impact on nesting success of Gray Catbirds (Dumetella carolinensis) breeding in Pennsylvania landscapes dominated by invasive Asian honeysuckles (Lonicera sp.). It turns out that they found little evidence to support the claim that honeysuckle represents an “ecological trap” of increased predation risk and poor nutritive value from fruits, contrary to the results of other researchers. Adult birds may have made more trips to the nest, bearing what some have called “junk food,” but body mass measurements of the nestlings, in this study, show that they grow up just fine.

Our results show that relationships between introduced fleshy-fruited plants and native birds are complex and not easily characterized as purely harmful or beneficial because they can include negative, neutral, or positive outcomes.

Sometimes, in the authors’ view, using an alien species is the best the birds can do, under the circumstances.

… the traditional and widespread categorical approach to invasive species management should be revised to prevent harming certain communities and ecosystems, especially areas in a process of self-recovery from heavy human disturbances.

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Some links: 69

Another post to clear out the inbox:

  • Steven Portugal et al. equipped 14 Bald Ibises (Geronticus eremita) with miniaturized GPS units to study the energetics and aerodynamics of flying in V formation. As the leader summarizes, each bird does indeed time its wingbeats to maximize the drafting effect of following another bird–abstract and heatmaps on the article page.

  • W. R. Grace & Co. has emerged from bankruptcy protection, as Catherine Ho reports.

    I interned for Grace in its New York headquarters in the late 1970s, and then somehow convinced someone at one of its newly-acquired retail businesses, Bermans, the Leather Experts to hire me full-time. (I lasted a year, and the lit out for Washington.) Bermans is long gone, merged into Wilsons and later Georgetown Leather Design, then gradually declining into liquidation in 2008. Back in the 1970s, Grace described its organization as a three-legged stool—specialty chemicals, energy, and consumer retail and restaurants. The energy game was no kinder to the portfolio than brands like Channel home centers and Houlihan’s restaurants. And, as Ho reports, personal-injury lawsuits stemming from asbestos contamination of the company’s vermiculite products sent the company into bankruptcy court.

    My workplace, the soaring building on 42nd Street (with a plaza that extended close enough to Sixth Avenue to give it an Avenue of the Americas address) still stands, but what’s left of the chemicals-only firm is now headquartered in Columbia, Maryland.

  • Brian Hayes uses a rhododendron shrub as a thermometer and wonders at the curled leaves’ apparent piecewise linear response to ambient temperature. Is the curling response a means to curtailing water loss, or a way to minimize UV damage to this understory shrub? Erik Tallak Nilsen likes the latter explanation.

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It’s in your oatmeal

At Botany POTD, Taisha explains, with compelling examples, Vavilovian mimicry, whereby a weedy taxon takes on characteristics of a domesticated crop by unintentional, generally human-induced, selection.

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Enroute: 5

the cloudIt’s been several weeks since I had the chance to walk home from work. So I was unprepared for the sight of this fine cloud of Black-eyed Susans in the Purple Beech/Ridge Heights meadow.

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After the blight

Helen Thompson reports on current efforts, via breeding and “cisgenic” techniques, to re-establish chestnuts in the Eastern forest.

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Enroute: 2

royal purpleA few ironweed (Vernonia sp.) plants are blooming in the Ridge Heights meadow.

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Late to bed

Interesting research from Jason D. Fridley that I may come back to when I take Carole Bergmann’s invasives class in August: Fridley conducted a three-year study comparing congeneric native and non-native shrubs and lianas in the Eastern deciduous forest. The non-natives’ competitive edge didn’t show itself in the spring; both aliens and natives leafed out at about the same time. But the foreign-born Euonymus, Lonicera, Viburnum, and other species dropped their leaves in autumn about a month later than the native woody plants.

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