3,016 research outputs found
利用状況
Comparison of the amount and nature of suspended matenal within Pos~donia oceanica
canopies, in 6 meadows in the Spanish Mediterranean coast differing in extent and depth, with those
in the overlying waters showed the canopies to be significantly enriched in particulate organic carbon,
nitrogen and phosphorus relative to the overlying waters (on average, 87, 34 and 54 % more C, N and
P, respectively). Biovolume of detntus (both angiosperm-denved and plankton-denved) was large, par-
ticularly within seagrass canopies, where it dominated the seston pool (about 5-fold greater biovolume
than that of living particles), compared to a roughly equal biovolume of detntal and llving particles in
the parhcle pools in the overlying waters. The dominance of detrital particles was further reflected in
the high C/N and C/P ratios of the suspended materials (median atonuc C : N . P ratios = 492: 40.9: 1 and
596:45.1 of the matenals suspended within the canopy and in the overly~ng waters, respectively),
which were intermediate between those of living plankton and P oceanica. The relative ennchment of
P oceanica canopies by part~cles tended to be greatest when particle loads in the overlying waters
were small, suggesting that the effect of seagrasses as traps of particles is enhanced in particle-poor
waters The results obtained support the hypothesis that the water within seagrass canopies is enriched
by (mostly detrital) part~cles, particularly In particle-poor waters T h ~ s suggests that seagrasses not only
contribute a substanhal fraction of the particles themselves, but also act as sinks of particles.This work is a contribution to the project
MAS3-CT96-0053 of the ELOISE programme, funded by MAST I11 (CE)Peer reviewe
Dorsal and ventral stimuli in cell–material interactions: effect on cell morphology
Cells behave differently between bidimensional (2D) and tridimensional (3D) environments. While most of the in vitro cultures are 2D, most of the in vivo extracellular matrices are 3D, which encourages the development of more relevant culture conditions, seeking to provide more physiological models for biomedicine (e.g., cancer, drug discovery and tissue engineering) and further insights into any dimension-dependent biological mechanism. In this study, cells were cultured between two protein coated surfaces (sandwich-like culture). Cells used both dorsal and ventral receptors to adhere and spread, undergoing morphological changes with respect to the 2D control. Combinations of fibronectin and bovine serum albumin on the dorsal and ventral sides led to different cell morphologies, which were quantified from bright field images by calculating the spreading area and circularity. Although the mechanism underlying these differences remains to be clarified, excitation of dorsal receptors by anchorage to extracellular proteins plays a key role on cell behavior. This approach—sandwich-like culture—becomes therefore a versatile method to study cell adhesion in well-defined conditions in a quasi 3D environment
Effect of lighting conditions on zebrafish growth and development
In the underwater environment, the properties of light (intensity and spectrum) change rapidly with depth and water quality. In this article, we have described how and to what extent lighting conditions can influence the development, growth, and survival of zebrafish. Fertilized eggs and the corresponding larvae were exposed to different visible light wavelengths (violet, blue, green, yellow, red, and white) in a 12-h light-12-h dark (LD) cycle until 30 days posthatching (dph), when the expression of morphometric parameters and growth (igf1a, igf2a)- and stress-related (crh and pomca) genes were examined. Another group of larvae was raised under constant darkness (DD) until 5 or 10 dph, after which they were transferred to a LD of white light. A third group remained under DD to investigate the effects of light deprivation upon zebrafish development. The results revealed that the hatching rate was highest under blue and violet light, while total length at 30 dph was greatest under blue, white, and violet light. Red light led to reduced feeding activity and poor survival (100% mortality). Larvae raised under constant white light (LL) showed a higher proportion of malformations, as did larvae raised under LD violet light. The expression of growth and stress factors was upregulated in the violet (igf1a, igf2a, pomca, and chr) and blue (igf2a) groups, which is consistent with the higher growth recorded and the higher proportion of malformations detected under the violet light. All larvae kept under DD died before 18 dph, but the survival rates improved in larvae transferred to LD at 5 dph and at 10 dph. In summary, these findings revealed that lighting conditions are crucial factors influencing zebrafish larval development and growth
Backpropagated Gradient Representations for Anomaly Detection
Learning representations that clearly distinguish between normal and abnormal
data is key to the success of anomaly detection. Most of existing anomaly
detection algorithms use activation representations from forward propagation
while not exploiting gradients from backpropagation to characterize data.
Gradients capture model updates required to represent data. Anomalies require
more drastic model updates to fully represent them compared to normal data.
Hence, we propose the utilization of backpropagated gradients as
representations to characterize model behavior on anomalies and, consequently,
detect such anomalies. We show that the proposed method using gradient-based
representations achieves state-of-the-art anomaly detection performance in
benchmark image recognition datasets. Also, we highlight the computational
efficiency and the simplicity of the proposed method in comparison with other
state-of-the-art methods relying on adversarial networks or autoregressive
models, which require at least 27 times more model parameters than the proposed
method.Comment: European Conference on Computer Vision (ECCV) 202
Comparative Evaluation of Action Recognition Methods via Riemannian Manifolds, Fisher Vectors and GMMs: Ideal and Challenging Conditions
We present a comparative evaluation of various techniques for action
recognition while keeping as many variables as possible controlled. We employ
two categories of Riemannian manifolds: symmetric positive definite matrices
and linear subspaces. For both categories we use their corresponding nearest
neighbour classifiers, kernels, and recent kernelised sparse representations.
We compare against traditional action recognition techniques based on Gaussian
mixture models and Fisher vectors (FVs). We evaluate these action recognition
techniques under ideal conditions, as well as their sensitivity in more
challenging conditions (variations in scale and translation). Despite recent
advancements for handling manifolds, manifold based techniques obtain the
lowest performance and their kernel representations are more unstable in the
presence of challenging conditions. The FV approach obtains the highest
accuracy under ideal conditions. Moreover, FV best deals with moderate scale
and translation changes
A novel feature selection-based sequential ensemble learning method for class noise detection in high-dimensional data
© 2018, Springer Nature Switzerland AG. Most of the irrelevant or noise features in high-dimensional data present significant challenges to high-dimensional mislabeled instances detection methods based on feature selection. Traditional methods often perform the two dependent step: The first step, searching for the relevant subspace, and the second step, using the feature subspace which obtained in the previous step training model. However, Feature subspace that are not related to noise scores and influence detection performance. In this paper, we propose a novel sequential ensemble method SENF that aggregate the above two phases, our method learns the sequential ensembles to obtain refine feature subspace and improve detection accuracy by iterative sparse modeling with noise scores as the regression target attribute. Through extensive experiments on 8 real-world high-dimensional datasets from the UCI machine learning repository [3], we show that SENF performs significantly better or at least similar to the individual baselines as well as the existing state-of-the-art label noise detection method
The sialic acid binding activity of the S protein facilitates infection by porcine transmissible gastroenteritis coronavirus
<p>Abstract</p> <p>Background</p> <p>Transmissible gastroenteritis virus (TGEV) has a sialic acid binding activity that is believed to be important for enteropathogenicity, but that has so far appeared to be dispensable for infection of cultured cells. The aims of this study were to determine the effect of sialic acid binding for the infection of cultured cells under unfavorable conditions, and comparison of TGEV strains and mutants, as well as the avian coronavirus IBV concerning their dependence on the sialic acid binding activity.</p> <p>Methods</p> <p>The infectivity of different viruses was analyzed by a plaque assay after adsorption times of 5, 20, and 60 min. Prior to infection, cultured cells were either treated with neuraminidase to deplete sialic acids from the cell surface, or mock-treated. In a second approach, pre-treatment of the virus with porcine intestinal mucin was performed, followed by the plaque assay after a 5 min adsorption time. A student's t-test was used to verify the significance of the results.</p> <p>Results</p> <p>Desialylation of cells only had a minor effect on the infection by TGEV strain Purdue 46 when an adsorption period of 60 min was allowed for initiation of infection. However, when the adsorption time was reduced to 5 min the infectivity on desialylated cells decreased by more than 60%. A TGEV PUR46 mutant (HAD3) deficient in sialic acid binding showed a 77% lower titer than the parental virus after a 5 min adsorption time. After an adsorption time of 60 min the titer of HAD3 was 58% lower than that of TGEV PUR46. Another TGEV strain, TGEV Miller, and IBV Beaudette showed a reduction in infectivity after neuraminidase treatment of the cultured cells irrespective of the virion adsorption time.</p> <p>Conclusions</p> <p>Our results suggest that the sialic acid binding activity facilitates the infection by TGEV under unfavorable environmental conditions. The dependence on the sialic acid binding activity for an efficient infection differs in the analyzed TGEV strains.</p
Activation of Ventral Tegmental Area 5-HT2C Receptors Reduces Incentive Motivation
FUNDING AND DISCLOSURE The research was funded by Wellcome Trust (WT098012) to LKH; and National Institute of Health (DK056731) and the Marilyn H. Vincent Foundation to MGM. The University of Michigan Transgenic Core facility is partially supported by the NIH-funded University of Michigan Center for Gastrointestinal Research (DK034933). The remaining authors declare no conflict of interest. ACKNOWLEDGMENTS We thank Dr Celine Cansell, Ms Raffaella Chianese and the staff of the Medical Research Facility for technical assistance. We thank Dr Vladimir Orduña for the scientific advice and technical assistance.Peer reviewedPublisher PD
Response of Quercus ilex seedlings to Phytophthora spp. root infection in a soil infestation test
[EN] Phytophthora species are the main agents associated with oak (Quercus spp.) decline, together with the changing environmental conditions and the intensive land use. The aim of this study was to evaluate the susceptibility of Quercus ilex to the inoculation with eight Phytophthora species. Seven to eight month old Q. ilex seedlings grown from acorns,
obtained from two Spanish origins, were inoculated with P. cinnamomi, P. cryptogea, P. gonapodyides, P. megasperma, P. nicotianae, P. plurivora, P. psychrophila and P. quercina. All Phytophthora inoculated seedlings showed decline and symptoms including small dark necrotic root lesions, root cankers, and loss of fine roots and tap root. The most aggressive species were P. cinnamomi, P. cryptogea, P. gonapodyides, P. plurivora and P. psychrophila followed by P. megasperma., while Phytophthora quercina and P. nicotianae were the less aggressive species. Results obtained confirm that these Phytophthora species could constituted a threat to Q. ilex ecosystems and the implications are further discussed.The authors are grateful to A. Solla and his team from the Centro Universitario de Plasencia-Universidad de Extremadura (Spain) for helping in the acorns collection and to the CIEF (Centro para la Investigación y Experimentación Forestal, Generalitat Valenciana, Valencia, Spain) for providing the acorns. This research was supported by funding from the project AGL2011- 30438-C02-01 (Ministerio de Economía y Competitividad, Spain).Mora-Sala, B.; Abad Campos, P.; Berbegal Martinez, M. (2018). Response of Quercus ilex seedlings to Phytophthora spp. root infection in a soil infestation test. European Journal of Plant Pathology. https://doi.org/10.1007/s10658-018-01650-6SÁlvarez, L. A., Pérez-Sierra, A., Armengol, J., & García-Jiménez, J. (2007). Characterization of Phytophthora nicotianae isolates causing collar and root rot of lavender and rosemary in Spain. Journal of Plant Pathology, 89, 261–264.Balci, Y., & Halmschlager, E. (2003a). Incidence of Phytophthora species in oak forests in Austria and their possible involvement in oak decline. Forest Pathology, 33, 157–174.Balci, Y., & Halmschlager, E. (2003b). Phytophthora species in oak ecosystems in Turkey and their association with declining oak trees. Plant Pathology, 52, 694–702.Brasier, C. M. (1992a). Oak tree mortality in Iberia. Nature, 360, 539.Brasier, C. M. ((1992b)). Phytophthora cinnamomi as a contributory factor on European oak declines. In N. by Luisi, P. Lerario, & A. B. Vannini (Eds.), Recent Advances in Studies on Oak Decline. Proc. Int. Congress, Brindisi, Italy, September 13-18, 1992 (pp. 49–58). Italy: Università degli Studi.Brasier, C. M. (1996). Phytophthora cinnamomi and oak decline in southern Europe. Environmental constraints including climate change. Annales des Sciences Forestieres, 53, 347–358.Brasier, C. M. (2008). The biosecurity threat to the UK and global environment from international trade in plants. Plant Pathology, 57, 792–808.Brasier, C. M., Hamm, P. B., & Hansen, E. M. (1993a). Cultural characters, protein patterns and unusual mating behaviour of P. gonapodyides isolates from Britain and North America. Mycological Research, 97, 1287–1298.Brasier, C. M., Robredo, F., & Ferraz, J. F. P. (1993b). Evidence for Phytophthora cinnamomi involvement in Iberian oak decline. Plant Pathology, 42, 140–145.Camilo-Alves, C. S. P., Clara, M. I. E., & Ribeiro, N. M. C. A. (2013). Decline of Mediterranean oak trees and its association with Phytophthora cinnamomi: a review. European Journal of Forest Research, 132, 411–432.Català, S., Berbegal, M., Pérez-Sierra, A., & Abad-Campos, P. (2017). Metabarcoding and development of new real-time specific assays reveal Phytophthora species diversity in holm oak forests in eastern Spain. Plant Pathology, 66, 115–123.Collett, D. (2003). Modelling survival data in medical research (2nd ed.). Boca Raton: Chapman & Hall/CRC, 410 pp.Corcobado, T., Cubera, E., Pérez-Sierra, A., Jung, T., & Solla, A. (2010). First report of Phytophthora gonapodyides involved in the decline of Quercus ilex in xeric conditions in Spain. New Disease Reports, 22, 33.Corcobado, T., Cubera, E., Moreno, G., & Solla, A. (2013). Quercus ilex forests are influenced by annual variations in water table, soil water deficit and fine root loss caused by Phytophthora cinnamomi. Agricultural and Forest Meteorology, 169, 92–99.Corcobado, T., Vivas, M., Moreno, G., & Solla, A. (2014). Ectomycorrhizal symbiosis in declining and non-declining Quercus ilex trees infected with or free of Phytophthora cinnamomi. Forest Ecology and Management, 324, 72–80.Corcobado, T., Miranda-Torres, J. J., Martín-García, J., Jung, T., & Solla, A. (2017). Early survival of Quercus ilex subspecies from different populations after infections and co-infections by multiple Phytophthora species. Plant Pathology, 66, 792–804.Erwin, D. C., & Ribeiro, O. K. (1996). Phytophthora diseases worldwide. St. Paul, Minnesota,USA: APS Press, American Phytopathological. Society 562pp.Gallego, F. J., Perez de Algaba, A., & Fernandez-Escobar, R. (1999). Etiology of oak decline in Spain. European Journal of Forest Pathology, 29, 17–27.Hansen, E., & Delatour, C. (1999). Phytophthora species in oak forests of north-east France. Annals of Forest Science, 56, 539–547.Hardham, A. R., & Blackman, L. M. (2010). Molecular cytology of Phytophthora plant interactions. Australasian Plant Pathology, 39, 29.Hernández-Lambraño, R. E., González-Moreno, P., & Sánchez-Agudo, J. Á. (2018). Environmental factors associated with the spatial distribution of invasive plant pathogens in the Iberian Peninsula: The case of Phytophthora cinnamomi Rands. Forest Ecology and Management, 419, 101–109.Jankowiak, R., Stępniewska, H., Bilański, P., & Kolařík, M. (2014). Occurrence of Phytophthora plurivora and other Phytophthora species in oak forests of southern Poland and their association with site conditions and the health status of trees. Folia Microbiologica, 59, 531–542.Jeffers, S. N., & Aldwinckle, H. S. (1987). Enhancing detection of Phytophthora cactorum in naturally infested soil. Phytopathology, 77, 1475–1482.Jiménez, A. J., Sánchez, E. J., Romero, M. A., Belbahri, L., Trapero, A., Lefort, F., & Sánchez, M. E. (2008). Pathogenicity of Pythium spiculum and P. sterilum on feeder roots of Quercus rotundifolia. Plant Pathology, 57, 369.Jönsson, U. (2006). A conceptual model for the development of Phytophthora disease in Quercus robur. New Phytologist, 171, 55–68.Jönsson, U., Jung, T., Rosengren, U., Nihlgard, B., & Sonesson, K. (2003). Pathogenicity of Swedish isolates of Phytophthora quercina to Quercus robur in two different soils. New Phytologist, 158, 355–364.Jung, T., & Burgess, T. I. (2009). Re-evaluation of Phytophthora citricola isolates from multiple woody hosts in Europe and North America reveals a new species, Phytophthora plurivora sp. nov. Persoonia, 22, 95–110.Jung, T., Blaschke, H., & Neumann, P. (1996). Isolation, identification and pathogenicity of Phytophthora species from declining oak stands. European Journal of Forest Pathology, 26, 253–272.Jung, T., Cooke, D. E. L., Blaschke, H., Duncan, J. M., & Oßwald, W. (1999). Phytophthora quercina sp. nov., causing root rot of European oaks. Mycological Research, 103, 785–798.Jung, T., Blaschke, H., & Oßwald, W. (2000). Involvement of soilborne Phytophthora species in Central European oak decline and the effect of site factors on the disease. Plant Pathology, 49, 706–718.Jung, T., Hansen, E. M., Winton, L., Oßwald, W., & Delatour, C. (2002). Three new species of Phytophthora from European oak forests. Mycological Research, 106, 397–411.Jung, T., Orlikowski, L., Henricot, B., Abad-Campos, P., Aday, A. G., Aguín Casal, O., Bakonyi, J., Cacciola, S. O., Cech, T., Chavarriaga, D., Corcobado, T., Cravador, A., Decourcelle, T., Denton, G., Diamandis, S., Dogmus-Lehtijärvi, H. T., Franceschini, A., Ginetti, B., Glavendekic, M., Hantula, J., Hartmann, G., Herrero, M., Ivic, D., Horta Jung, M., Lilja, A., Keca, N., Kramarets, V., Lyubenova, A., Machado, H., Magnano di San Lio, G., Mansilla Vázquez, P. J., Marçais, B., Matsiakh, I., Milenkovic, I., Moricca, S., Nagy, Z. Á., Nechwatal, J., Olsson, C., Oszako, T., Pane, A., Paplomatas, E. J., Pintos Varela, C., Prospero, S., Rial Martínez, C., Rigling, D., Robin, C., Rytkönen, A., Sánchez, M. E., Scanu, B., Schlenzig, A., Schumacher, J., Slavov, S., Solla, A., Sousa, E., Stenlid, J., Talgø, V., Tomic, Z., Tsopelas, P., Vannini, A., Vettraino, A. M., Wenneker, M., Woodward, S., & Peréz-Sierra, A. (2016). Widespread Phytophthora infestations in European nurseries put forest, semi-natural and horticultural ecosystems at high risk of Phytophthora diseases. Forest Pathology, 46, 134–163.Kroon, L. P., Brouwer, H., de Cock, A. W., & Govers, F. (2012). The genus Phytophthora anno 2012. Phytopathology, 102, 348–364.Linaldeddu, B. T., Scanu, B., Maddau, L., & Franceschini, A. (2014). Diplodia corticola and Phytophthora cinnamomi: the main pathogens involved in holm oak decline on Caprera Island (Italy). Forest Pathology, 44, 191–200.Luque, J., Parladé, J., & Pera, J. (2000). Pathogenicity of fungi isolated from Quercus suber in Catalonia (NE Spain). Forest Pathology, 30, 247–263.Luque, J., Parladé, J., & Pera, J. (2002). Seasonal changes in susceptibility of Quercus suber to Botryosphaeria stevensii and Phytophthora cinnamomi. Plant Pathology, 51, 338–345.MAGRAMA. (2014). Diagnóstico del Sector Forestal Español. Análisis y Prospectiva - Serie Agrinfo/Medioambiente n° 8. Ed. Ministerio de Agricultura, Alimentación y Medio Ambiente. In NIPO: 280-14-081-9.Martín-García, J., Solla, A., Corcobado, T., Siasou, E., & Woodward, S. (2015). Influence of temperature on germination of Quercus ilex in Phytophthora cinnamomi, P. gonapodyides, P. quercina and P. psychrophila infested soils. Forest Pathology, 45, 215–223.Maurel, M., Robin, C., Capron, G., & Desprez-Loustau, M. L. (2001). Effects of root damage associated with Phytophthora cinnamomi on water elations, biomass accumulation, mineral nutrition and vulnerability to water deficit of five oak and chestnut species. Forest Pathology, 31, 353–369.McKinney, H. H. (1923). Influence of soil temperature and moisture on infection of wheat seedlings by Helminthosporium sativum. Journal of Agricultural Research, 26, 195–217.Moralejo, E., Pérez-Sierra, A., Álvarez, L. A., Belbahri, L., Lefort, F., & Descals, E. (2009). Multiple alien Phytophthora taxa discovered on diseased ornamental plants in Spain. Plant Pathology, 58, 100–110.Mora-Sala, B., Berbegal, M., & Abad-Campos, P. (2018). The use of qPCR reveals a high frequency of Phytophthora quercina in two Spanish holm oak areas. Forests, 9(11):697. https://doi.org/10.3390/f9110697 .Moreira, A. C., & Martins, J. M. S. (2005). Influence of site factors on the impact of Phytophthora cinnamomi in cork oak stands in Portugal. Forest Pathology, 35, 145–162.Mrázková, M., Černý, K., Tomosovsky, M., Strnadová, V., Gregorová, B., Holub, V., Panek, M., Havrdová, L., & Hejná, M. (2013). Occurrence of Phytophthora multivora and Phytophthora plurivora in the Czech Republic. Plant Protection Science, 49, 155–164.Navarro, R. M., Gallo, L., Sánchez, M. E., Fernández, P., & Trapero, A. (2004). Efecto de distintas fertilizaciones de fósforo en la resistencia de brinzales de encina y alcornoque a Phytophthora cinnamomi Rands. Investigación Agraria. Sistemas y Recursos Forestales, 13, 550–558.Panabières, F., Ali, G., Allagui, M., Dalio, R., Gudmestad, N., Kuhn, M., Guha Roy, S., Schena, L., & Zampounis, A. (2016). Phytophthora nicotianae diseases worldwide: new knowledge of a long-recognised pathogen. Phytopathologia Mediterranea, 55, 20–40.Pérez-Sierra, A., & Jung, T. (2013). Phytophthora in woody ornamental nurseries. In: Phytophthora: A global perspective (pp. 166-177). Ed. by Lamour, K. Wallingford: CABI.Pérez-Sierra, A., Mora-Sala, B., León, M., García-Jiménez, J., & Abad-Campos, P. (2012). Enfermedades causadas por Phytophthora en viveros de plantas ornamentales. Boletín de Sanidad Vegetal-Plagas, 38, 143–156.Pérez-Sierra, A., López-García, C., León, M., García-Jiménez, J., Abad-Campos, P., & Jung, T. (2013). Previously unrecorded low-temperature Phytophthora species associated with Quercus decline in a Mediterranean forest in eastern Spain. Forest Pathology, 43, 331–339.Redondo, M. A., Pérez-Sierra, A., & Abad-Campos, P. (2015). Histology of Quercus ilex roots during infection by Phytophthora cinnamomi. Trees - Structure and Function, 29, 1943–5197.Ríos, P., Obregón, S., de Haro, A., Fernández-Rebollo, P., Serrano, M. S., & Sánchez, M. E. (2016). Effect of Brassica Biofumigant Amendments on Different Stages of the Life Cycle of Phytophthora cinnamomi. Journal of Phytopathology, 164, 582–594.Rizzo, D. M., Garbelotto, M., Davidson, J. M., Slaughter, G. W., & Koike, S. T. (2002). Phytophthora ramorum as the cause of extensive mortality of Quercus spp. and Lithocarpus densiflorus in California. Plant Disease, 86, 205–214.Robin, C., Desprez-Loustau, M. L., Capron, G., & Delatour, C. (1998). First record of Phytophthora cinnamomi on cork and holm oaks in France and evidence of pathogenicity. Annales Des Sciences Forestieres, 55, 869–883.Robin, C., Capron, G., & Desprez-Loustau, M. L. (2001). Root infection by Phytophthora cinnamomi in seedlings of three oak species. Plant Pathology, 50, 708–716.Rodríguez-Molina, M. C., Torres-Vila, L. M., Blanco-Santos, A., Núñez, E. J. P., & Torres-Álvarez, E. (2002). Viability of holm and cork oak seedlings from acorns sown in soils naturally infected with Phytophthora cinnamomi. Forest Pathology, 32, 365–372.Romero, M. A., Sánchez, J. E., Jiménez, J. J., Belbahri, L., Trapero, A., Lefort, F., & Sánchez, M. E. (2007). New Pythium taxa causing root rot in Mediterranean Quercus species in southwest Spain and Portugal. Journal of Phytopathology, 115, 289–295.Sánchez de Lorenzo-Cáceres J. M. (2001). Guía de las plantas ornamentales. S.A. Mundi-Prensa Libros. ISBN 9788471149374. 688 pp.Sánchez, M. E., Caetano, P., Ferraz, J., & Trapero, A. (2002). Phytophtora disease of Quercus ilex in south-western Spain. Forest Pathology, 32, 5–18.Sánchez, M. E., Sánchez, J. E., Navarro, R. M., Fernández, P., & Trapero, A. (2003). Incidencia de la podredumbre radical causada por Phytophthora cinnamomi en masas de Quercus en Andalucía. Boletín de Sanidad Vegetal-Plagas, 29, 87–108.Sánchez, M. E., Andicoberry, S., & Trapero, A. (2005). Pathogenicity of three Phytophthora spp. causing late seedling rot of Quercus ilex ssp. ballota. Forest Pathology, 35, 115–125.Sánchez, M. E., Caetano, P., Romero, M. A., Navarro, R. M., & Trapero, A. (2006). Phytophthora root rot as the main factor of oak decline in southern Spain. In: Progress in Research on Phytophthora Diseases of Forest Trees. Proceedings of the Third International IUFRO Working Party S07.02.09. Meeting at Freising. Germany 11-18 September 2004. Brasier C. M., Jung T., Oßwald W. (Eds). Forest Research. Farnham, UK. pp. 149-154.Scanu, B., Linaldeddu, B. T., Deidda, A., & Jung, T. (2015). Diversity of Phytophthora species from declining Mediterranean maquis vegetation, including two new species, Phytophthora crassamura and P. ornamentata sp. nov. PLoS ONE, 10. https://doi.org/10.1371/journal.pone.0143234 .Schmitthenner, A. F., & Canaday, C. H. (1983). Role of chemical factors in the development of Phytophthora diseases. In: Phytophthora. Its biology, taxonomy, ecology, and pathology (pp.189-196). Ed. by Erwin D. C., Bartnicki-Garcia S., Tsao P. H. St. Paul, : The American Phytopathological Society.Scibetta, S., Schena, L., Chimento, A., Cacciola, S. A., & Cooke, D. E. L. (2012). A molecular method to assess Phytophthora diversity in environmental samples. Journal of Microbiological Methods, 88, 356–368.Sena, K., Crocker, E., Vincelli, P., & Barton, C. (2018). Phytophthora cinnamomi as a driver of forest change: Implications for conservation and management. Forest Ecology and Management, 409, 799–807.Thines, M. (2013). Taxonomy and phylogeny of Phytophthora and related oomycetes In: Phytophthora: A global perspective (pp. 11-18). Ed. by Lamour, K. Wallingford: CABI.Tsao, P. H. (1990). Why many Phytophthora root rots and crown rots of tree and horticultural crops remain undetected. EPPO Bulletin, 20, 11–17.Tuset, J. J., Hinarejos, C., Mira, J. L., & Cobos, M. (1996). Implicación de Phytophthora cinnamomi Rands en la enfermedad de la seca de encinas y alcornoques. Boletín de Sanidad Vegetal-Plagas, 22, 491–499.Vettraino, A. M., Barzanti, G. P., Bianco, M. C., Ragazzi, A., Capretti, P., Paoletti, E., & Vannini, A. (2002). Occurrence of Phytophthora species in oak stands in Italy and their association with declining oak trees. Forest Pathology, 32, 19–28.Xia, K., Hill, L. M., Li, D. Z., & Walters, C. (2014). Factors affecting stress tolerance in recalcitrant embryonic axes from seeds of four Quercus (Fagaceae) species native to the USA or China. Annals of Botany, 114, 1747–1759
Effects of seagrasses and algae of the Caulerpa family on hydrodynamics and particle-trapping rates
The widespread decline of seagrass beds within the Mediterranean often results in the replacement of seagrasses by opportunistic green algae of the Caulerpa family. Because Caulerpa beds have a different height, stiffness and density compared to seagrasses, these changes in habitat type modify the interaction of the seafloor with hydrodynamics, influencing key processes such as sediment resuspension and particle trapping. Here, we compare the effects on hydrodynamics and particle trapping of Caulerpa taxifolia, C. racemosa, and C. prolifera with the Mediterranean seagrasses Cymodocea nodosa and Posidonia oceanica. All macrophyte canopies reduced near-bed volumetric flow rates compared to bare sediment, vertical profiles of turbulent kinetic energy revealed peak values around the top of the canopies, and maximum values of Reynolds stress increased by a factor of between 1.4 (C. nodosa) and 324.1 (P. oceanica) when vegetation was present. All canopies enhanced particle retention rates compared to bare sediment. The experimental C. prolifera canopy was the most effective at particle retention (m2 habitat); however, C. racemosa had the largest particle retention capacity per structure surface area. Hence, in terms of enhancing particle trapping and reducing hydrodynamic forces at the sediment surface, Caulerpa beds provided a similar or enhanced function compared to P.oceanica and C. nodosa. However, strong seasonality in the leaf area index of C. racemosa and C. taxifolia within the Mediterranean, combined with a weak rhizome structure, suggests that sediments maybe unprotected during winter storms, when most erosion occurs. Hence, replacement of seagrass beds with Caulerpa is likely to have a major influence on annual sediment dynamics at ecosystem scales.This research was funded by the European Network of Excellence ‘‘Marine Biodiversity and Ecosystem Function’’ (MarBEF); FP6, EC contract no. 505446 and a grant from the Fundacio ´n BBVA. EPM was supported by a European Union Marie Curie host fellowship for transfer of knowledge, MTKD-CT-2004-509254, the Spanish national project EVAMARIA (CTM2005-00395/MAR) and the regional government of Andalusia project FUNDIV(P07-RNM-2516)
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