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Jobin V, Das A, Harikrishnan CP, Chanda R, Lawrence S, Robin VV. Patterns of understory invasion in invasive timber stands of a tropical sky island. Ecol Evol 2023; 13:e9995. [PMID: 37066061 PMCID: PMC10099487 DOI: 10.1002/ece3.9995] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 03/25/2023] [Accepted: 03/28/2023] [Indexed: 04/18/2023] Open
Abstract
Current climate and land cover change threaten global mountaintops with increased spread of invasive species. Long-established plantations of invasive trees on these mountaintops can alter their surroundings, further increasing invader-facilitated invasion. Identifying the ecological conditions promoting such associations can help develop better management interventions. The Western Ghats's Shola Sky Islands (>1400 m MSL) host vast stretches of invasive tree plantations that sustain the colonization of other invasive woody, herbaceous, and fern species in their understories. Here, we analyzed vegetation and landscape variables from 232 systematically placed plots in randomly selected grids using non-metric multidimensional scaling and Phi coefficient approaches to examine patterns of association (positive interactions) between understory invasive species with specific invasive overstory species. We also conducted GLMM with zero inflation to determine the influence of environmental variables where such associations occur. We find that understory invasion of multiple species under the canopy of other invasives is widespread across the Shola Sky Islands. Stands of Eucalyptus host the colonization of 70% of non-native invasive species surveyed across the Shola Sky Islands. In particular, the Lantana camara invasion is strongly associated with Eucalyptus stands. We also found that climatic variables affect the colonization of understory woody invasive species, while invasion by exotic herbaceous species is associated with the density of road networks. Canopy cover impacts all invasives negatively, while fire incidence was negatively associated with invasion by Lantana spp. and the Pteridium spp. While the restoration of natural habitats primarily targets the highly invasive Acacia, less invasive Eucalyptus and Pinus are often not included. Our study suggests that retaining such invasive species in natural habitats, particularly protected areas, can hinder ongoing grassland restoration efforts by facilitating further invasions by multiple woody and herbaceous species.
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Affiliation(s)
- Varughese Jobin
- Indian Institute of Science Education and Research (IISER) TirupatiKarakambadi RoadTirupatiIndia
| | - Arundhati Das
- National Centre for Biological SciencesBengaluruIndia
| | - C. P. Harikrishnan
- Indian Institute of Science Education and Research (IISER) TirupatiKarakambadi RoadTirupatiIndia
| | - Ritobroto Chanda
- Indian Institute of Science Education and Research (IISER) TirupatiKarakambadi RoadTirupatiIndia
- Present address:
Centre for Ecological SciencesIndian Institute of ScienceCV Raman RoadBengaluru560012India
| | - Swapna Lawrence
- Indian Institute of Science Education and Research (IISER) TirupatiKarakambadi RoadTirupatiIndia
- Present address:
Wildlife Institute of IndiaWildlife Institute Rd, ChandrabaniDehradunUttarakhand248001India
| | - V. V. Robin
- Indian Institute of Science Education and Research (IISER) TirupatiKarakambadi RoadTirupatiIndia
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Sinnott‐Armstrong MA, Ogawa Y, van de Kerkhof GT, Vignolini S, Smith SD. Convergent evolution of disordered lipidic structural colour in the fruits of Lantana strigocamara (syn. L. camara hybrid cultivar). New Phytol 2022; 235:898-906. [PMID: 35590489 PMCID: PMC9328138 DOI: 10.1111/nph.18262] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Accepted: 04/05/2022] [Indexed: 06/15/2023]
Abstract
The majority of plant colours are produced by anthocyanin and carotenoid pigments, but colouration obtained by nanostructured materials (i.e. structural colours) is increasingly reported in plants. Here, we identify a multilayer photonic structure in the fruits of Lantana strigocamara and compare it with a similar structure in Viburnum tinus fruits. We used a combination of transmission electron microscopy (EM), serial EM tomography, scanning force microscopy and optical simulations to characterise the photonic structure in L. strigocamara. We also examine the development of the structure during maturation. We found that the structural colour derives from a disordered, multilayered reflector consisting of lipid droplets of c.105 nm that form a plate-like structure in 3D. This structure begins to form early in development and reflects blue wavelengths of light with increasing intensity over time as the structure develops. The materials used are likely to be lipid polymers. Lantana strigocamara is the second origin of a lipid-based photonic structure, convergently evolved with the structure in Viburnum tinus. Chemical differences between the lipids in L. strigocamara and those of V. tinus suggest a distinct evolutionary trajectory with implications for the signalling function of structural colours in fruits.
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Affiliation(s)
- Miranda A. Sinnott‐Armstrong
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
- Department of Ecology & Evolutionary BiologyUniversity of Colorado‐BoulderBoulderCO80309USA
| | - Yu Ogawa
- Univ. Grenoble Alpes, CNRS, CERMAVGrenoble38000France
| | | | - Silvia Vignolini
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
| | - Stacey D. Smith
- Department of Ecology & Evolutionary BiologyUniversity of Colorado‐BoulderBoulderCO80309USA
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Joseph SV. Insect growth regulators elicit transovarial effects on Teleonemia scrupulosa (Hemiptera: Tingidae). Pest Manag Sci 2022; 78:1800-1805. [PMID: 35019229 DOI: 10.1002/ps.6797] [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: 11/09/2021] [Revised: 01/04/2022] [Accepted: 01/09/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Lantana lace bug, Teleonemia scrupulosa Stål (Hemiptera: Tingidae), is an important insect pest of lantana (Lantana camara L.). The adults and nymphs feed on the leaves, gradually deteriorating the quality of leaf tissue, as the affected leaves appear brown and desiccated. Infestations of T. scrupulosa reduce the market value of container plants in nurseries and the aesthetic value of ornamental landscapes. Because T. scrupulosa typically is managed using neonicotinoids and concerns related to the nontargeted effects of neonicotinoids on pollinators are mounting, practitioners are seeking alternative options to manage T. scrupulosa infestations. Insect growth regulators (IGRs) elicit transovarial activity, where adults exposed to IGRs produce nonviable eggs, but this effect has not been documented for T. scrupulosa. RESULTS A significantly lower number of T. scrupulosa nymphs was produced when adults were sprayed topically with novaluron and pyriproxyfen than nontreated adults. The number of T. scrupulosa nymphs produced was not significantly different when adults were exposed to a lower dose (0.125×) and a maximum dose (1.0×) of novaluron. CONCLUSION Novaluron and pyriproxyfen elicited transovarial effects on T. scrupulosa when adults were exposed to these IGRs. Evidence of transovarial effects was demonstrated when T. scrupulosa adults were exposed to lower doses (≤0.125×) than the maximum label dose, as densities of nymphs were similar between the lower doses and the maximum label dose of novaluron.
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Affiliation(s)
- Shimat V Joseph
- Department of Entomology, University of Georgia, Griffin, GA, USA
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Ramos Elizagaray SI, Quiroga PL, Pérez RD, Sosa C, Pérez CA, Bongiovanni GA, Soria EA. Effect of the Aqueous Extract of Lantana grisebachii Stuck Against Bioaccumulated Arsenic-Induced Oxidative and Lipid Dysfunction in Rat Splenocytes. J Diet Suppl 2020; 16:401-407. [PMID: 29958031 DOI: 10.1080/19390211.2018.1470124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Arsenic (As) is a worldwide immunotoxic agent that is in contaminated waters and consumed by mammals. Phytotherapy may counteract its harmful effects. Lantana grisebachii Stuck (LG, Verbenaceae) and its extract are proposed as protective, given vvits in vitro bioactivity. The aim was to determine the protective capacity of the aqueous LG extract on splenocytes exposed in vivo to arsenic. Splenocytes were obtained from an arsenicosis model (Wistar rats consuming orally 0 [control; C] or 5 mg/Kg/d of As) that received 0-100 mg/Kg/d of LG extract for 30 days. As content (total reflection X-ray fluorescence), fatty acid profile (gas chromatography), γ-glutamyl transpeptidase activity (Szasz method), peroxides (xylenol orange-based assay), and nitrites (Griess reaction) were then assayed in viable splenocytes. Data were analyzed with ANOVA and the Tukey's test (p < .05). It was observed that the splenocytes contained 2.2 mg/Kg of this elemental arsenic. With γ-glutamyl transpeptidase inhibition and consequent triggering of hydroperoxides (p < .05), it was observed to increase saturated fatty acids and alter lipid profiles. LG treatment avoided damaging effects with values similar to unexposed C (p < .05), and cellular arsenic concentration (p < .0001). In conclusion, the aqueous extract of L. grisebachii counteracted arsenic toxicity in rat splenocytes by preventing its cellular accumulation and induction of lipid and redox disturbances, which may impair immune function.
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Affiliation(s)
- Sabina I Ramos Elizagaray
- a Universidad Nacional de Córdoba, Facultad de Ciencias Médicas , Cátedra de Biología Celular, Histología y Embriología, Instituto de Biología Celular , Córdoba , Argentina
| | - Patricia L Quiroga
- a Universidad Nacional de Córdoba, Facultad de Ciencias Médicas , Cátedra de Biología Celular, Histología y Embriología, Instituto de Biología Celular , Córdoba , Argentina
| | - Roberto D Pérez
- b Universidad Nacional de Córdoba , Facultad de Matemática, Astronomía y Física , Córdoba , Argentina.,c Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, IFEG , Córdoba , Argentina
| | - Carlos Sosa
- b Universidad Nacional de Córdoba , Facultad de Matemática, Astronomía y Física , Córdoba , Argentina.,c Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, IFEG , Córdoba , Argentina
| | - Carlos A Pérez
- d Ministério da Ciência , Tecnologia e Inovação, Centro Nacional de Pesquisa em Energia e Materiais, Laboratório Nacional de Luz Síncrotron , Campinas , Brazil
| | - Guillermina A Bongiovanni
- e Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, PROBIEN , Neuquén , Argentina.,f Universidad Nacional del Comahue , Facultad de Ciencias Agrarias , Neuquén , Argentina
| | - Elio A Soria
- a Universidad Nacional de Córdoba, Facultad de Ciencias Médicas , Cátedra de Biología Celular, Histología y Embriología, Instituto de Biología Celular , Córdoba , Argentina.,g Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, INICSA , Córdoba , Argentina
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