Extinction by citation deficiency: are botany journals at risk?

PurposeWith the current dynamics of scientific publishing increasingly driven by citation metrics, it is quite possible this will lead to the loss of some lower-ranked journals as they will be undervalued by authors, research institutions and research funders. This has been specifically predicted for natural science journals, but the efforts of editors of such journals to improve reputation have not been quantitatively assessed. This research aimed to fill this knowledge gap and assess the potential vulnerability of lower-ranked botany journals.Design/methodology/approachChanges in article citation rates since 2009 for 21 lower-ranked general botany journals were examined by least squares linear regression and factors potentially predictive of higher citation potential by principal component analysis. The findings were then examined in a case study of the publishing that followed the celebrated discovery of a living-fossil plant (Wollemia nobilis) in the mid-1990s.FindingsArticle citation rates steadily declined across most of these 21 journals over the period, and if submissions had been favoured (directly or indirectly) for citation potential, this appears to have been an ineffective, perhaps even a flawed, endeavour. Analysis of quantifiable article attributes across a subset of these journals revealed inconsistent relationships with no predictive value for citation potential. The case study clearly highlighted some processes contributing to declining citation rates and the value of botanical reporting well beyond that indicated by citation metrics.Research limitations/implicationsIt is not possible to know how important prediction of citation potential (directly or indirectly) is when journal editors accept papers for review or publication (such information is not made public, and this might not be a formalised process), so this study is only based what is considered (by the author) to be a reasonable assumption that all journals aim to improve their reputation and use citation metrics as one determinant of this.Social implicationsUnless we give value to lower-ranked regional botany journals in other ways than citations, the current trends in citation rates could lead to the diminution, even loss, of their valuable contribution biodiversity conservation.Originality/valueAlthough concerns have been expressed about the long-term viability of natural history journals, this is the first research to examine this quantitatively using citation metrics.

From Patagonia to Indonesia: plant fossils highlight West Gondwanan legacy in the Malesian flora

Rainforests with the chinquapin Castanopsis and the yellowwood conifer Dacrycarpus occur today throughout Indonesia and the larger Malesian ecoregion, but they represent, in part, a history of survival stretching tens of millions of years and thousands of kilometers to the palaeo-Antarctic. Unlike New World and African tropical rainforests, the Malesian flora’s history is closely tied to tectonic introductions from exotic terranes, and thus, much palaeobotanical data about the origins of the Malesian rainforest comes from those terranes. For example, South America, Antarctica, and Australia remained adjacent until the Eocene final separation of Gondwana, and warm climates promoted high-latitude dispersals among those landmasses. Australia’s subsequent northward movement led to the late Oligocene Sahul-Sunda collision and the uplift of New Guinea, allowing the introductions into Malesia of survivor taxa that were once widespread in mesic Gondwanan rainforests. In Patagonian Argentina, the prolific Laguna del Hunco (52.2 Ma) site preserves abundant and well-preserved fossils of an unexpectedly large number of lineages whose living relatives characteristically associate in perhumid, lower montane “oak-laurel” rainforests of Malesia, especially in New Guinea. These taxa include the angiosperms Castanopsis (Fagaceae), Gymnostoma (rhu, Casuarinaceae), Alatonucula (extinct engelhardioid Juglandaceae), Eucalyptus (gums, Myrtaceae), Ceratopetalum (coachwood, Cunoniaceae), Lauraceae (laurel family), and Ripogonum (supplejack, Ripogonaceae); conifers in Cupressaceae (cypress family: Papuacedrus), Araucariaceae (dammars and relatives: Agathis and Araucaria Section Eutacta), and Podocarpaceae (yellowwoods: Dacrycarpus, Podocarpus, and a species similar to Phyllocladus); and the fern Todea (king fern, Osmundaceae). Many of these records are the only occurrences of the respective taxa in South America, living or fossil, vastly extending their past ranges and thus the biogeographic history of part of the Malesian mountain flora. The living-fossil taxa inhabit, and several dominate, critical watershed areas of high endemism and biodiversity in Malesia’s endangered tropical-montane rainforests. In Malesia itself, there have been very few Cenozoic palaeobotanical investigations for about a century or more. To remedy this situation and improve understanding of the evolution of the Malesian flora in situ, we have begun palaeobotanical fieldwork in collaboration with Professor Yahdi Zaim and ITB, along with international colleagues. So far, we have discovered several promising new fossil sites in the Eocene-Oligocene of West Sumatra (Sangkarewang and Sawahlunto formations) and South Kalimantan (Tanjung Formation), and I will report preliminary observations.

Antioxidant Phenylpropanoid Glycosides from Ginkgo biloba Fruit and Identification of a New Phenylpropanoid Glycoside, Ginkgopanoside

Ginkgo biloba (Ginkgoaceae), well-known as the oldest living plant species and often referred to as a “living fossil,” is a famous medicinal plant that has been used in multiple countries to improve numerous illnesses, including anxiety, dementia, peripheral artery disease, and eye problems. We conducted a phytochemical exploration of G. biloba fruit, commonly consumed as a functional food as part of an ongoing natural product chemical research for the discovery of bioactive phytochemicals with novel structures. The natural product chemical analysis of the methanol extract of G. biloba fruit using column chromatography and high-performance liquid chromatography separation under the guidance of a liquid chromatography–mass spectrometry (LC/MS)-based analysis identified six phenylpropanoid glycosides (1–6), including one new compound, ginkgopanoside (1). The structures of the isolated compounds were elucidated by nuclear magnetic resonance spectroscopic data and LC/MS analysis, and the absolute configuration of compound 1 was established by chemical reactions followed by the application of Snatzke’s method. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activities of the isolated compounds 1–6 and the aglycone 1a of 1 were evaluated, and we found that compounds 1–5 exhibited antioxidant activities with IC50 values in the range 32.75–48.20 μM, while the aglycone 1a exhibited greater radical scavenging activity (IC50 = 5.23 μM) comparable to that of ascorbic acid (IC50 = 2.54 μM), a positive control, implying that the present of glucose may decrease the DPPH scavenging activity. These findings provide experimental information that the active phenylpropanoid glycosides could represent natural antioxidants for use in pharmaceuticals and functional foods.

Is the beetle Omma (Insecta: Coleoptera) a living fossil?

A new ommatin beetle, Omma (Coronomma) axsmithi subgen. et sp. nov. (Insecta: Coleoptera: Archostemata: Ommatidae sensu stricto (Cupedidae sensu lato)) is described in mid-Cretaceous Kachin amber from northern Myanmar. The new taxon distinctly differs from nominotypical Omma in possessing a subquadrilateral versus subglobose pronotum, the latter visible in Omma lii from the same deposit. The uniquely preserved male genitalia of the latter are compared and contrasted with extant ommatins and fossil notocupedins. This new analysis suggests that the living Australian ommatin beetles (Omma, Beutelius) may not be as ancient as is sometimes supposed.

The first late cretaceous mawsoniid coelacanth (Sarcopterygii: Actinistia) from North America: Evidence of a lineage of extinct ‘living fossils’

Today, the only living genus of coelacanth, Latimeria is represented by two species along the eastern coast of Africa and in Indonesia. This sarcopterygian fish is nicknamed a "living fossil", in particular because of its slow evolution. The large geographical distribution of Latimeria may be a reason for the great resilience to extinction of this lineage, but the lack of fossil records for this genus prevents us from testing this hypothesis. Here we describe isolated bones (right angular, incomplete basisphenoid, fragments of parasphenoid and pterygoid) found in the Cenomanian Woodbine Formation in northeast Texas that are referred to the mawsoniid coelacanth Mawsonia sp. In order to assess the impact of this discovery on the alleged characteristic of "living fossils" in general and of coelacanths in particular: 1) we compared the average time duration of genera of ray-finned fish and coelacanth in the fossil record; 2) we compared the biogeographic signal from Mawsonia with the signal from the rest of the vertebrate assemblage of the Woodbine formation; and 3) we compared these life traits with those of Latimeria. The stratigraphical range of Mawsonia is at least 50 million years. Since Mawsonia was a fresh, brackish water fish with probably a low ability to cross large sea barriers and because most of the continental components of the Woodbine Fm vertebrate assemblage exhibit Laurasian affinities, it is proposed that the Mawsonia’s occurrence in North America is more likely the result of a vicariant event linked to the break-up of Pangea rather than the result of a dispersal from Gondwana. The link between a wide geographic distribution and the resilience to extinction demonstrated here for Mawsonia is a clue that a similar situation existed for Latimeria, which allowed this genus to live for tens of millions of years.

Ecology and conservation of a living fossil: Australia's Wollemi Pine (Wollemia nobilis)

The iconic Wollemi Pine (Wollemia nobilis) is a critically endangered Australian conifer and one of the world’s rarest trees with only 46 mature individuals remaining in the wild. The species is regarded as a ‘living fossil’ and was discovered on the brink of extinction following a natural historical decline. While its discovery has enabled crucial intervention for its long-term conservation, it has also created novel threats. Wollemia nobilis is facing extinction in the wild due to its highly restricted distribution, extremely small population size, and ongoing impacts from exotic pathogens, inappropriate fire regimes, unauthorised site visitation, and anthropogenic climate change. A highly successful, collaborative program combining in situ management, ecological research and monitoring with public education and ex situ conservation strategies, such as translocation and commercial cultivation, is enhancing the species’ long-term survival. The extended longevity and slow growth and maturation of wild Wollemi Pine present unique challenges to effective in situ conservation, including the multidecadal timescales required to deliver certain conservation objectives. The continued success of the conservation program depends on strong forward planning, intergenerational commitment and collaboration, and ongoing public support.

Ginkgo Biloba, a famous living fossil tree and an ancient herbal traditional Chinese medicine

Background: Ginkgo (Ginkgo biloba) is a living fossil and a deciduous tree, which has extracts with antidiabetic, antioxidant anticancer, antihypertensive, immunestimulative, hepato-protective and antimicrobial activities, memory enhancement efficiency and beneficial effects against neurodegenerative disease. Objective: The goal of this manuscript is survey on medicinal values and natural benefits of Ginkgo. Methods: This review evaluated publication in MEDLINE/PubMEd database and Google Scholar. The keywords used to electronically search were Ginkgo biloba, living fossil, bioactive components and traditional Chinese medicine. Results: Its main active constituents extracts are flavones glycosides such kaempferol, quercetin and isorhamnetin, terpene lactones, alkyphenols, proanthocyanadins, rhamnose, glucose, D-glucaric acid, ginkgolic acid, organic acids such as hydroxykinurenic, kynurenic, protocatechic, shikimic and vanillic. Ginkgo kernels have been used as medicine or eaten as nut in traditional medicinal science. The most notable pharmaceutical application of Ginkgo are in cardiovascular disease, Alzheimer, impaired cerebral performance, vascular insufficiency, antidepressant-induced sexual dysfunction, premenstrual syndrome, liver fibrosis, vascular disease, tinnitus, macular degeneration, memory and vertigo. Conclusion: Development of modern drugs from Ginkgo by considering the importance of traditional medicinal Asian science with further researches should be emphasized.

Genome-Wide Evidence for Complex Hybridization and Demographic History in a Group of Cycas From China

Cycads represent one of the most ancestral living seed plants as well as one of the most threatened plant groups in the world. South China is a major center and potential origin of Cycas, the most rapidly diversified lineage of cycads. However, genomic-wide diversity of Cycas remains poorly understood due to the challenge of generating genomic markers associated with their inherent large genomes. Here, we perform a comprehensive conservation genomic study based on restriction-site associated DNA sequencing (RADseq) data in six representative species of Cycas in South China. Consistently low genetic diversity and strong genetic differentiation were detected across species. Both phylogenetic inference and genetic structure analysis via several methods revealed generally congruent groups among the six Cycas species. The analysis with ADMIXTURE showed low mixing of genetic composition among species, while individuals of C. dolichophylla exhibited substantial genetic admixture with C. bifida, C. changjiangensis, and C. balansae. Furthermore, the results from Treemix, f4-statistic, and ABBA-BABA test were generally consistent and revealed the complex patterns of interspecific gene flow. Relatively strong signals of hybridization were detected between C. dolichophylla and C. szechuanensis, and the ancestor of C. taiwaniana and C. changjiangensis. Distinct patterns of demographic history were inferred for these species by Stairway Plot, and our results suggested that both climate fluctuation and frequent geological activities during the late Pleistocene exerted deep impacts on the population dynamics of these species in South China. Finally, we explore the practical implications of our findings for the development of conservation strategies in Cycas. The present study demonstrates the efficiency of RADseq for conservation genomic studies on non-model species with large and complex genomes. Given the great significance of cycads as a radical transition in the evolution of plant biodiversity, our study provides important insights into the mechanisms of diversification in such recently radiated living fossil taxa.