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Journal articles on the topic 'Stratified dispersal'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

LE CORRE, VALÉRIE, NATHALIE MACHON, RÉMY J. PETIT, and ANTOINE KREMER. "Colonization with long-distance seed dispersal and genetic structure of maternally inherited genes in forest trees: a simulation study." Genetical Research 69, no. 2 (1997): 117–25. http://dx.doi.org/10.1017/s0016672397002668.

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Since the last glacial period forest trees have expanded to their present range very rapidly, with rates up to 500 m yr−1 for oaks in Europe, which can be explained only by the dispersion of acorns over long distances. We used a stratified dispersal model, including both diffusive and long-distance dispersal of seeds, to simulate the colonization of a 100 km×300 km grid by populations of oak trees. An appropriate rate of spread is obtained with rare dispersal at distances of the order of tens of kilometres. We simulated the effect of stratified versus diffusive dispersal of seeds on the spatia

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Fobert, Emily K., Eric A. Treml, and Stephen E. Swearer. "Dispersal and population connectivity are phenotype dependent in a marine metapopulation." Proceedings of the Royal Society B: Biological Sciences 286, no. 1909 (2019): 20191104. http://dx.doi.org/10.1098/rspb.2019.1104.

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Larval dispersal is a key process determining population connectivity, metapopulation dynamics, and community structure in benthic marine ecosystems, yet the biophysical complexity of dispersal is not well understood. In this study, we investigate the interaction between disperser phenotype and hydrodynamics on larval dispersal pathways, using a temperate reef fish species, Trachinops caudimaculatus . We assessed the influence of larval traits on depth distribution and dispersal outcomes by: (i) using 24-h depth-stratified ichthyoplankton sampling, (ii) quantifying individual phenotypes using

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3

Clark, Geoffrey, Fiona Petchey, Olaf Winter, Mike Carson, and Patrick O'Day. "New Radiocarbon Dates from the Bapot-1 Site in Saipan and Neolithic Dispersal by Stratified Diffusion." Journal of Pacific Archaeology 1, no. 1 (2009): 21–35. http://dx.doi.org/10.70460/jpa.v1i1.7.

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The colonisation of the Mariana Islands in Western Micronesia is likely to represent an early ocean dispersal of more than 2000 km. Establishing the date of human arrival in the archipelago is important for modelling Neolithic expansion in Island Southeast Asia and the Pacific, particularly the role of long-distance dispersals. This paper presents new 14C results and a ΔR estimate from the Bapot-1 site on Saipan Island, which indicate human arrival at ca. 3400-3200 cal. BP. Archaeological chronologies of long-distance dispersal to Western Micronesia and the Lapita expansion (Bismarcks to Samoa

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Dessard, H., and A. Bar-Hen. "Experimental design for spatial sampling applied to the study of tropical forest regeneration." Canadian Journal of Forest Research 35, no. 5 (2005): 1149–55. http://dx.doi.org/10.1139/x04-187.

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For practical reasons, estimating seed production in tropical forest is only possible by sampling. Classical sampling designs (random or systematic) give poor estimations of seed abundance. The spatial disposition of the trees, combined with nonuniform seed dispersal, leads to a highly heterogeneous spatial distribution of the seeds. We propose a random stratified sampling design based on a model that takes account of seed dispersal processes and the location of the trees. We assume a gamma distribution for dispersal distances. The overall seed dispersal area is divided into adjacent quadrats.

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Sasaki, R., and SA Shepherd. "Larval dispersal and recruitment of Haliotis discus hannai and Tegula spp. on Miyagi coasts, Japan." Marine and Freshwater Research 46, no. 3 (1995): 519. http://dx.doi.org/10.1071/mf9950519.

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The spatial dispersal and vertical distribution of larvae of Haliotis discus hannai and Tegula spp. were examined in relation to storm events in Miyagi Prefecture, Japan, from 1983 to 1993. Epidemic spawning is induced by typhoons and minor storms. After typhoons, larvae are dispersed in coastal waters up to 3 km from shore to a depth of 30 m and later are advected toward the coast by onshore winds. After minor storms, larvae are locally dispersed close to shore. Larvae of H. discus hannai and Tegula spp. become vertically stratified and settle on the substratum at depths in accordance with th

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Strickland, Christopher, Nadiah P. Kristensen, and Laura Miller. "Inferring stratified parasitoid dispersal mechanisms and parameters from coarse data using mathematical and Bayesian methods." Journal of The Royal Society Interface 14, no. 130 (2017): 20170005. http://dx.doi.org/10.1098/rsif.2017.0005.

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Biological invasions have movement at the core of their success. However, due to difficulties in collecting data, medium- and long-distance dispersal of small insects has long been poorly understood and likely to be underestimated. The agricultural release of parasitic hymenoptera, a group of wasps that are critical for biological pest control, represents a rare opportunity to study the spread of insects on multiple spatial scales. As these insects are typically less than 1 mm in size and are challenging to track individually, a first-time biocontrol release will provide a known spatial positi

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7

Hill, A. E. "Diel vertical migration in stratified tidal flows: Implications for plankton dispersal." Journal of Marine Research 56, no. 5 (1998): 1069–96. http://dx.doi.org/10.1357/002224098765173464.

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8

Sapoukhina, Natalia, Yuri Tyutyunov, Ivan Sache, and Roger Arditi. "Spatially mixed crops to control the stratified dispersal of airborne fungal diseases." Ecological Modelling 221, no. 23 (2010): 2793–800. http://dx.doi.org/10.1016/j.ecolmodel.2010.08.020.

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9

Liebhold, Andrew M., Timothy H. Keitt, Nikunj Goel, and Cleo Bertelsmeier. "Scale invariance in the spatial-dynamics of biological invasions." NeoBiota 62 (October 15, 2020): 269–78. https://doi.org/10.3897/neobiota.62.53213.

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Despite the enormous negative consequences of biological invasions, we have a limited understanding of how spatial demography during invasions creates population patterns observed at different spatial scales. Early stages of invasions, arrival and establishment, are considered distinct from the later stage of spread, but the processes of population growth and dispersal underlie all invasion phases. Here, we argue that the spread of invading species, to a first approximation, exhibits scale invariant spatial-dynamic patterns that transcend multiple spatial scales. Dispersal from a source popula

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10

Mayorga-Adame, CG, JA Polton, AD Fox, and LA Henry. "Spatiotemporal scales of larval dispersal and connectivity among oil and gas structures in the North Sea." Marine Ecology Progress Series 685 (March 10, 2022): 49–67. http://dx.doi.org/10.3354/meps13970.

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The ecological role of offshore man-made infrastructure is of growing international interest. By 2030, globally more than 7500 oil and gas platforms could be removed, many of which now host mature hard substrate ecosystems formed by sessile benthic species including sponges, corals and mussels. We investigated the spatiotemporal scales of generalised species dispersal and connectivity among oil and gas structures in the North Sea using strategically designed 3D advective passive particle tracking experiments forced by high resolution (1.8 km, hourly) velocity fields including tide-, density- a

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van Maren, D. S., and P. Hoekstra. "Dispersal of suspended sediments in the turbid and highly stratified Red River plume." Continental Shelf Research 25, no. 4 (2005): 503–19. http://dx.doi.org/10.1016/j.csr.2004.10.010.

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12

Baskin, Jerry M., and Carol C. Baskin. "Role of dispersal date and changes in physiological responses in controlling timing of germination in achenes of Geum canadense." Canadian Journal of Botany 63, no. 9 (1985): 1654–58. http://dx.doi.org/10.1139/b85-227.

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This study examines the importance of the date of dispersal, and of the changes in the physiological responses of achenes before and after dispersal, in regulating timing of germination in Geum canadense Jacq. The effect of dispersal date on germination was tested by collecting achenes from the parent plants from September through June and sowing them on soil in an unheated greenhouse. Changes in germination responses were monitored by testing achenes of each collection in light and darkness over a range of thermoperiods. Regardless of test conditions, achenes required light for germination. A

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Belouard, Nadège, Bona Sebastiano De, Matthew R. Helmus, Isabella G. Smith, and Jocelyn E. Behm. "A method to quantify jump dispersal of invasive species from occurrence data: the case of the spotted lanternfly, Lycorma delicatula." NeoBiota 98 (May 19, 2025): 319–34. https://doi.org/10.3897/neobiota.98.147310.

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The accuracy of predicting the spread of biological invasions is improved if models explicitly incorporate the two main dispersal mechanisms: diffusive spread and jump dispersal. However, quantitative methods for differentiating these two mechanisms in spatial occurrence data are lacking. We present jumpID, an R package using directional analysis of occurrence data to distinguish between jump dispersal and diffusive spread in biological invasions. We applied this method to occurrence data from the spotted lanternfly (<i>Lycorma delicatula</i>) invasion in the US, a pest rapidly expanding its r

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Liebhold, Andrew M., Timothy H. Keitt, Nikunj Goel, and Cleo Bertelsmeier. "Scale invariance in the spatial-dynamics of biological invasions." NeoBiota 62 (October 15, 2020): 269–78. http://dx.doi.org/10.3897/neobiota.62.53213.

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Despite the enormous negative consequences of biological invasions, we have a limited understanding of how spatial demography during invasions creates population patterns observed at different spatial scales. Early stages of invasions, arrival and establishment, are considered distinct from the later stage of spread, but the processes of population growth and dispersal underlie all invasion phases. Here, we argue that the spread of invading species, to a first approximation, exhibits scale invariant spatial-dynamic patterns that transcend multiple spatial scales. Dispersal from a source popula

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15

Lucio, Felipe Ridolfo, Augusto Kalsing, Fernando Storniolo Adegas, et al. "Dispersal and Frequency of Glyphosate-Resistant and Glyphosate-Tolerant Weeds in Soybean-producing Edaphoclimatic Microregions in Brazil." Weed Technology 33, no. 1 (2019): 217–31. http://dx.doi.org/10.1017/wet.2018.97.

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AbstractGlyphosate-resistant (GR) and glyphosate-tolerant weeds cause considerable yield losses and represent a growing threat to soybean production systems. Despite the relevance of this topic, few studies have evaluated the dispersal of these species in Brazil. The objective of this study was to evaluate the dispersal and frequency of known GR and glyphosate-tolerant weeds in soybean-producing microregions. A total of 2,481 interviews were conducted in different regions of Brazil. The interviews were stratified among 20 edaphoclimatic microregions (ECRs) to cover all of the country’s soybean

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Finestone, Emma M., Paul S. Breeze, Sebastian F. M. Breitenbach, et al. "Paleolithic occupation of arid Central Asia in the Middle Pleistocene." PLOS ONE 17, no. 10 (2022): e0273984. http://dx.doi.org/10.1371/journal.pone.0273984.

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Central Asia is positioned at a crossroads linking several zones important to hominin dispersal during the Middle Pleistocene. However, the scarcity of stratified and dated archaeological material and paleoclimate records makes it difficult to understand dispersal and occupation dynamics during this time period, especially in arid zones. Here we compile and analyze paleoclimatic and archaeological data from Pleistocene Central Asia, including examination of a new layer-counted speleothem-based multiproxy record of hydrological changes in southern Uzbekistan at the end of MIS 11. Our findings i

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Eminniyaz, Amanulla, Juan Qiu, Dunyan Tan, Carol C. Baskin, Jerry M. Baskin, and Robert S. Nowak. "Dispersal Mechanisms of the Invasive Alien Plant Species Buffalobur (Solanum rostratum) in Cold Desert Sites of Northwest China." Weed Science 61, no. 4 (2013): 557–63. http://dx.doi.org/10.1614/ws-d-13-00011.1.

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Dispersal mechanisms of the alien plant species buffalobur during its invasion of cold desert areas in Xinjiang, northwestern China, were investigated. Seeds and fruits were readily moved by water in irrigation canals in the transition zone between natural desert and a farmed oasis. Maximum flotation time in moving canal water was ∼ 4 h for seeds and > 48 h for fruits, and water moved fruits 279 m in 10 min. Also, 100% of the seeds remained viable during 8 wk of flooding in the laboratory. Mean dispersal distance was 3.4 m by wind-driven rolling of detached plants and 0.5 m by ants. Retenti

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18

Loh, Roberta, Fabio Rubio Scarano, Marcio Alves-Ferreira, and Fabiano Salgueiro. "Fine-scale spatial genetic structure, neighbourhood size and gene dispersal in clonal plants: exploring the best possible estimates." Botanical Journal of the Linnean Society 192, no. 4 (2019): 760–72. http://dx.doi.org/10.1093/botlinnean/boz109.

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Abstract Gene movement in plants is determined by seed and pollen flow and its limitation results in spatial structuring of genetic variation, affecting potential levels of inbreeding within populations. In clonal plants, clonal propagation may also play an important role in spatial genetic structure (SGS). Characterization of SGS usually is done by analysing several spatial scales with large sample sizes to ensure a reliable measure. Several sampling strategies are available, but most are not suitable for clonal plants. Here, two sampling strategies were used to characterize within-population

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Lupi, Daniela, Mario Colombo, Maria Luisa Giudici, Bruno Villa, Cesare Cenghialta, and Daniele Passoni. "On the spatial spread of the Rice Water Weevil, Lissorhoptrus oryzophilus Kuschel (Coleoptera: Erirhinidae), in Italy." Journal of Entomological and Acarological Research 42, no. 2 (2010): 81. http://dx.doi.org/10.4081/jear.2010.81.

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A five year study has been made to establish the spread of the rice water weevil <em>Lissorhoptrus oryzophilus</em> (Coleoptera: Erirhinidae) in Northern Italy. Data obtained with GPS from 2005 throughout 2009 were first georeferenced with SW ArcGis&reg; 9.2, then overlapped and compared to the map of the European environmental landscape based on the interpretation of satellite images (CORINE Land Cover map) and to the hydrographic chart CT10 (Technical Regional map 10000). The analysis of the radial rate of spread per year indicates a deceleration in the expansion from 10.864

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Gorchov, David L., Steven M. Castellano, and Douglas A. Noe. "Long-Distance Dispersal and Diffusion in the Invasion of Lonicera maackii." Invasive Plant Science and Management 7, no. 3 (2014): 464–72. http://dx.doi.org/10.1614/ipsm-d-13-00105.1.

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AbstractTo investigate the relative importance of long-distance dispersal vs. diffusion in the invasion of a nonnative plant, we used age structure to infer the contribution to recruitment of external propagule rain vs. within-population reproduction. We quantified the age structure of 14 populations of Amur honeysuckle in a landscape where it recently invaded, in Darke County, OH. We sampled the largest honeysuckle individuals in each population (woodlots), and aged these by counting annual rings in stem cross sections. Individuals in the oldest four 1-yr age classes are assumed to be from ex

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Ciosi, M., N. J. Miller, S. Toepfer, A. Estoup, and T. Guillemaud. "Stratified dispersal and increasing genetic variation during the invasion of Central Europe by the western corn rootworm, Diabrotica virgifera virgifera." Evolutionary Applications 4, no. 1 (2010): 54–70. http://dx.doi.org/10.1111/j.1752-4571.2010.00133.x.

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22

Bereś, Paweł K., Patrycja Ziętara, Mirosław Nakonieczny, Łukasz Kontowski, Michał Grzbiela, and Maria Augustyniak. "Cydalima perspectalis in Poland—8 Years of Invasion against the Background of Three Other Invasive Species." Diversity 14, no. 1 (2021): 22. http://dx.doi.org/10.3390/d14010022.

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The box tree moth (Cydalima perspectalis) origins from East Asia. In Europe, it was recorded for the first time in 2007, and in Poland in 2012. By the end of 2020, it was found all over Poland. There are no published data on the range of C. perspectalis occurrence in Poland because it is not a quarantine pest in the European Union and is not subject to official monitoring. Data collected in 2018–2020 via a website dedicated to monitoring, for the first time, illustrate the current range and its largest concentrations in southern and central Poland. The monitoring confirmed that the main direct

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Hoguane, Antonio M., Tor Gammelsrod, Noca B. Furaca, Anabela C. Cafermane, and Maria H. P. António. "The residual circulation profile of the Bons Sinais Estuary in central Mozambique - potential implications for larval dispersal and fisheries." Western Indian Ocean Journal of Marine Science, no. 1/2021 (December 23, 2021): 17–27. http://dx.doi.org/10.4314/wiojms.si2021.1.2.

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The residual circulation in estuaries determines the net exchange of water, heat, salt, fine sediments and drifting biological organisms between estuarine and nearshore marine waters. The Bons Sinais Estuary in central Mozambique is ~ 30 km long with the city of Quelimane and an industrial port on the northern bank of its upper reaches. To investigate residual circulation in the estuary, seasonal (wet, dry and transition season) CTD profiling data were collected at 11 fixed stations between the upper estuary and mouth, and vertical current profiles were measured over a full tidal cycle at a fi

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Song, Danping, Ganesh K. Jaganathan, Yingying Han, and Baolin Liu. "Seed dormancy in Camellia sinensis L. (Theaceae): effects of cold-stratification and exogenous gibberellic acid application on germination." Botany 95, no. 2 (2017): 147–52. http://dx.doi.org/10.1139/cjb-2016-0149.

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There are several different opinions regarding dormancy in tea (Camellia sinensis L.), but there is no strong evidence available to conclude whether or not these seeds are dormant. Freshly matured tea seeds collected from Hangzhou, China, at the natural dispersal time did not germinate in light at daily alternative temperature regimes of 10/15, 15/20, 20/25, or 25/35 °C, or at a constant temperature of 25 °C. Seeds were permeable to water and the embryos did not grow prior to radicle emergence, thus, the seeds have no physical, morphological, or morphophysiological dormancy. When cold-stratifi

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Geneve, Robert L., and Sharon T. Kester. "Morphophysiological seed dormancy inHeptacodium." Seed Science Research 28, no. 3 (2018): 192–96. http://dx.doi.org/10.1017/s0960258518000053.

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AbstractHeptacodium miconiodesis an endangered, monotypic genus in the Caprifoliaceae endemic to China. Species within the Caprifoliaceae have been shown to have morphological or morphophysiological dormancy.Heptacodiumseeds had an underdeveloped embryo at the time of fruit dispersal with an embryo that occupied approximately 12% of the seed length. Cold (8 weeks at 5°C) and warm (8 weeks at 20°C) stratification was effective for dormancy release, but embryo growth prior to germination only occurred at warm temperatures (20°C). Gibberellic acid treatment partially substituted for cold stratifi

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Azmi, Fauziah, Chad L. Hewitt, and Marnie L. Campbell. "A hub and spoke network model to analyse the secondary dispersal of introduced marine species in Indonesia." ICES Journal of Marine Science 72, no. 3 (2014): 1069–77. http://dx.doi.org/10.1093/icesjms/fsu150.

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Abstract Indonesia is a biodiversity hotspot threatened with new introductions of marine species. As with many countries, Indonesia has a stratified shipping network of international ports linked to a large suite of domestic ports. We developed a hub and spoke network model to examine the risk associated with the secondary transfer of introduced marine species from the port hub of Tanjung Priok in Jakarta Bay to the 33 Indonesian provinces (including other ports in the Jakarta province). An 11-year shipping dataset was used (vessel next port of call records for maritime vessels that originated

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Bosch, Marjolein D., Marcello A. Mannino, Amy L. Prendergast, et al. "New chronology for Ksâr ‘Akil (Lebanon) supports Levantine route of modern human dispersal into Europe." Proceedings of the National Academy of Sciences 112, no. 25 (2015): 7683–88. http://dx.doi.org/10.1073/pnas.1501529112.

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Modern human dispersal into Europe is thought to have occurred with the start of the Upper Paleolithic around 50,000–40,000 y ago. The Levantine corridor hypothesis suggests that modern humans from Africa spread into Europe via the Levant. Ksâr ‘Akil (Lebanon), with its deeply stratified Initial (IUP) and Early (EUP) Upper Paleolithic sequence containing modern human remains, has played an important part in the debate. The latest chronology for the site, based on AMS radiocarbon dates of shell ornaments, suggests that the appearance of the Levantine IUP is later than the start of the first Upp

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Hlevca, Bogdan, Edward Todd Howell, Reza Valipour, and Mohammad Madani. "Modeling nearshore-offshore water exchange in Lake Ontario." PLOS ONE 20, no. 1 (2025): e0298702. https://doi.org/10.1371/journal.pone.0298702.

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The water quality and resources of Lake Ontario’s nearshore ecosystem undergo heightened stress, particularly along the northwest shoreline. Hydrodynamic processes linking the distinct nearshore and offshore trophic structures play a crucial role in transporting nutrient-loaded water along and across the shore. Despite the pivotal connection between algae growth and the development of nuisance proportions, the scales over which these processes operate remain poorly understood. This study delves into the exchange dynamics between nearshore and offshore areas of Lake Ontario throughout 2018, emp

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Theodorou, A. J. "Physical Oceanographic Studies for the Design of the Athens Sea Outfall (Saronikos Gulf, Greece)." Water Science and Technology 25, no. 9 (1992): 31–40. http://dx.doi.org/10.2166/wst.1992.0203.

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The discharge of about 600 000 m3/day of untreated wastewater into the northern part of Saronikos Gulf constitutes the major source of pollution for the latter. To take corrective measures, a new treatment plant and sea disposal by a deep outfall system is under construction. The basic design concept is to produce a submerged sewage field below the pycnocline, during the stratified period, at a location where the ambient current field is strong enough to advect it diluted to the open sea. Accordingly, the objectives aimed at obtaining accurate descriptions of the annual variation of the densit

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Cox, David L., and Daniel A. Potter. "WITHIN-CROWN DISTRIBUIONS OF MALE AND FEMALE BAGWORM (LEPIDOPTERA: PSYCHIDAE) PUPAE ON JUNIPER AS AFFECTED BY HOST DEFOLIATION." Canadian Entomologist 120, no. 6 (1988): 559–67. http://dx.doi.org/10.4039/ent120559-6.

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AbstractWe examined the within-crown distributions of male and female bagworm, Thyridopteryx ephemeraeformis (Haworth), pupae on Juniperus virginiana L. as a function of prior defoliation. This was to evaluate the hypothesis that the differential movement of females to the upper crown before pupation would be strongest on heavily defoliated trees. Differential stratification of the sexes occurred irrespective of degree of defoliation, and despite the fact that competition, as evidenced by higher mortality of pupae and reduced weight of egg masses, was apparently greatest at the top of moderate

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Bakry, Aboualhassan, Ahmed Saied, and Doaa Ibrahim. "The Oldowan in the Egyptian Nile Valley." Journal of African Archaeology 18, no. 2 (2020): 229–41. http://dx.doi.org/10.1163/21915784-20200010.

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Abstract Although there is no good “Oldowan” record in the Egyptian Nile Valley, the presence of the “Pebble Tools Tradition” is confirmed by surface finds, scattered in the valley and the deserts, recorded through both early and recent excavations, and confirmed by three important stratified sites at Western Thebes, Nag el Amra and Abassieh. Evidence for the existence of the Oldowan complex in Egypt was found, although there was no water corridor connecting the East African highlands to the Mediterranean, as the Proto-Nile had its sources within Egypt itself at the time of the Plio-Pleistocen

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Diogoul, Ndague, Patrice Brehmer, Yannick Perrot, et al. "Fine-scale vertical structure of sound-scattering layers over an east border upwelling system and its relationship to pelagic habitat characteristics." Ocean Science 16, no. 1 (2020): 65–81. http://dx.doi.org/10.5194/os-16-65-2020.

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Abstract. Understanding the relationship between sound-scattering layers (SSLs) and pelagic habitat characteristics is a substantial step to apprehend ecosystem dynamics. SSLs are detected on echo sounders representing aggregated marine pelagic organisms. In this study, SSL characteristics of zooplankton and micronekton were identified during an upwelling event in two contrasting areas of the Senegalese continental shelf. Here a cold upwelling-influenced inshore area was sharply separated by a strong thermal boundary from a deeper, warmer, stratified offshore area. Mean SSL thickness and SSL v

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Yang, Wei, Qing Wang, Xiaoyun Pan, and Bo Li. "Estimation of the Probability of Long-Distance Dispersal: Stratified Diffusion of <i>Spartina alterniflora</i> in the Yangtze River Estuary." American Journal of Plant Sciences 05, no. 24 (2014): 3642–51. http://dx.doi.org/10.4236/ajps.2014.524380.

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Navarro-Rosales, Francisco, and Matthew B. V. Bell. "Vegetation patches in semiabandoned olive groves: using generalised linear mixed models to determine the effect of area on community composition of woody plants." Forest Systems 31, no. 2 (2022): e007. http://dx.doi.org/10.5424/fs/2022312-18779.

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Aim of study: The existence of distinct vegetation habitats within semiabandoned olive groves provides a unique chance to study the plant community within semiabandoned Mediterranean landscapes. We investigated changes in community composition of woody plants across a gradient of patch sizes by providing an example of a novel statistical technique. We also aimed to determine if commonness, life form and dispersal mechanisms of woody plants are key factors influencing species presence at vegetation patches of different sizes. Area of study: Three traditional, partially managed mountain ol

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Herranz, José M., Elena Copete, and Pablo Ferrandis. "Non-deep complex morphophysiological dormancy inNarcissus longispathus(Amaryllidaceae): implications for evolution of dormancy levels within sectionPseudonarcissi." Seed Science Research 23, no. 2 (2013): 141–55. http://dx.doi.org/10.1017/s0960258513000056.

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AbstractNarcissus longispathus(Amaryllidaceae) is a perennial geophyte and a Mediterranean narrowly endemic species. At dispersal time,N. longispathusseeds are dormant and have underdeveloped embryos. This work aimed to determine requirements for dormancy break and germination and to compare dormancy traits with those of the two endemic Iberian congeners. Phenology of embryo growth and germination were studied by regularly exhuming seeds sown in near-natural conditions. Temperature and light requirements for embryo growth, breaking of dormancy and germination were determined by incubating seed

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Valeri, Simone, Laura Zavattero, and Giulia Capotorti. "Ecological Connectivity in Agricultural Green Infrastructure: Suggested Criteria for Fine Scale Assessment and Planning." Land 10, no. 8 (2021): 807. http://dx.doi.org/10.3390/land10080807.

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In promoting biodiversity conservation and ecosystem service capacity, landscape connectivity is considered a critical feature to counteract the negative effects of fragmentation. Under a Green Infrastructure (GI) perspective, this is especially true in rural and peri-urban areas where a high degree of connectivity may be associated with the enhancement of agriculture multifunctionality and sustainability. With respect to GI planning and connectivity assessment, the role of dispersal traits of tree species is gaining increasing attention. However, little evidence is available on how to select

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Grauer, Ralph, Daniel Ranti, Kirsten Greene, Michael A. Gorin, Mani Menon, and Saša Zorc. "Characterization of Applicant Preference Signals, Invitations for Interviews, and Inclusion on Match Lists for Residency Positions in Urology." JAMA Network Open 6, no. 1 (2023): e2250974. http://dx.doi.org/10.1001/jamanetworkopen.2022.50974.

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ImportancePreference signals were to be implemented in over 15 specialties during the 2022-2023 residency match. Analyzing results from the implementation of signals during the American Urological Association (AUA) urology match may inform future behavior.ObjectiveTo characterize applicant and program signal usage and results in the Society of Academic Urology and AUA databases with respect to interview invites and rank list creation.Design, Setting, and ParticipantsThis cohort study involved all applicants and residencies in the 2021-2022 AUA match with data analysis conducted in April throug

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Courtois, Andrew, Samuel Bentley, Jillian Maloney, et al. "Short-Term Sediment Dispersal on a Large Retreating Coastal River Delta via 234Th and 7Be Sediment Geochronology: The Mississippi River Delta Front." Water 16, no. 3 (2024): 463. http://dx.doi.org/10.3390/w16030463.

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Many Mississippi River Delta studies have shown recent declines in fluvial sediment load from the river and associated land loss. In contrast, recent sedimentary processes on the subaqueous delta are less documented. To help address this knowledge gap, multicores were collected offshore from the three main river outlets at water depths of 25–280 m in June 2017 just after the peak river discharge period, with locations selected based on 2017 U.S. Geological Survey seabed mapping. The coring locations included the undisturbed upper foreset, mudflow lobes, gullies, and the undisturbed prodelta. N

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Antoniazzi, Reuber, Arleu B. Viana-Junior, Jaime Pelayo-Martínez, et al. "Distance–decay patterns differ between canopy and ground ant assemblages in a tropical rainforest." Journal of Tropical Ecology 36, no. 5 (2020): 234–42. http://dx.doi.org/10.1017/s0266467420000188.

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AbstractBoth decreases in compositional similarity with increasing geographic distances between sites (i.e. distance–decay relationship) and vertical stratification of species composition are key issues in ecology. However, the intersection between these two trends has scarcely been investigated. Here we use identical sampling methods in the canopy and at ground level in a tropical rainforest remnant on the coast of the Gulf of Mexico to evaluate, for the first time, a distance–decay relationship within vertical strata in insect assemblages. We found that the ant assemblage was vertically stra

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Herranz, Raquel, Miguel A. Copete, José M. Herranz, Elena Copete, and Pablo Ferrandis. "Optimization of Plant Production by Seed Treatment in Two Wild Subspecies of Narcissus pseudonarcissus Rich in Alkaloids." Molecules 25, no. 19 (2020): 4439. http://dx.doi.org/10.3390/molecules25194439.

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The daffodil Narcissus pseudonarcissus L. contains alkaloids of pharmaceutical interest. Wild daffodil populations have diverse genetic backgrounds and various genetic traits of possible importance. Developing protocols for plant production from seeds may ensure the availability of a large reservoir of individuals as well as being important for species with bulbs that are difficult to acquire. The closely related Narcissus pseudonarcissus subsp. munozii-garmendiae and subsp. nevadensis were investigated in this study because the alkaloids isolated from both are of high pharmacological interest

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Japhet, Emmanuel, Mwita M. Mangora, Carl C. Trettin, and Judith A. Okello. "Natural recovery of mangroves in abandoned rice farming areas of the Rufiji Delta, Tanzania." Western Indian Ocean Journal of Marine Science 18, no. 2 (2019): 25–36. http://dx.doi.org/10.4314/wiojms.v18i2.3.

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Natural recovery of mangroves in abandoned rice farming areas is important for reviving its multiple ecosystem services including climate change mitigation. This study aims at understanding the natural recovery rate and pattern of mangroves in the abandoned rice farming areas of the Rufiji Delta. Mangrove areas were stratified into early and intermediate succession as well as old growth forest. Forty-five nested plots, fifteen at each site, were randomly selected, where plant and soil data were collected. Based on the Importance Value Index, the most abundant tree species in the early successi

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Reynolds, A. M. "Exponential and Power-Law Contact Distributions Represent Different Atmospheric Conditions." Phytopathology® 101, no. 12 (2011): 1465–70. http://dx.doi.org/10.1094/phyto-01-11-0001.

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It is well known that the dynamics of plant disease epidemics are very sensitive to the functional form of the contact distribution—the probability distribution function for the distance of viable fungal spore movement until deposition. Epidemics can take the form of a constant-velocity travelling wave when the contact distribution is exponentially bounded. Fat-tailed contact distributions, on the other hand, lead to epidemic spreads that accelerate over time. Some empirical data for contact distributions can be well represented by negative exponentials while other data are better represented

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Jensen, Henrik, Peter J. Wright, and Peter Munk. "Vertical distribution of pre-settled sandeel (Ammodytes marinus) in the North Sea in relation to size and environmental variables." ICES Journal of Marine Science 60, no. 6 (2003): 1342–51. http://dx.doi.org/10.1016/s1054-3139(03)00150-4.

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Abstract Vertical distribution patterns of larval and juvenile sandeels were investigated at four locations in the North Sea. Sandeels between 6 and 65 mm were found to depths of 80 m, with vertical distributions dependent on both length and environmental factors. At one location with a stratified water column, the highest densities were found during the day in midwater where food concentration was also highest. In areas without marked vertical hydrographic gradients, larvae were relatively more abundant in surface waters during the day. At all locations, larvae of all sizes were generally mor

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TAGLIORETTI, V., M. H. FUGASSA, D. RINDEL, and N. H. SARDELLA. "New parasitological findings for pre-Hispanic camelids." Parasitology 144, no. 13 (2017): 1763–68. http://dx.doi.org/10.1017/s0031182017000932.

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SUMMARYPaleoparasitological examination provides information of parasite–host associations in the past, shedding light on the geographical origin of some parasites, on the possible dispersal routes and on some of the processes that modelled the parasitic communities. The aim of the present study was to examine parasite remains present in camelid coprolites collected from the archaeological site Alero Destacamento Guardaparque, Patagonia and to discuss the paleoparasitological findings in a biogeographical and paleoecological context. Coprolites were collected from different stratified layers d

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Martinkova, Zdenka, Alois Honek, and Jan Lukas. "Seed age and storage conditions influence germination of barnyardgrass (Echinochloa crus-galli)." Weed Science 54, no. 02 (2006): 298–304. http://dx.doi.org/10.1614/ws-05-005r.1.

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Germination was investigated in 1-yr and 8-yr-old seed lots of barnyardgrass. Each seed lot was divided into a portion stored dry at 25 C (afterripening) and a portion buried in the field (stratification) in central Europe (latitude 50°N, longitude 14°E). The afterripened seed lost dormancy within 2 yr after dispersal, whereas buried seed passed through annual dormancy/nondormancy cycles. The seed was germinated at five constant temperatures between 17 and 35 C with an 18/6-h light/dark photoperiod. Germination was affected by both seed age and storage conditions. Germination percentage and ra

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Forbis, Tara A., and Pamela K. Diggle. "Subnivean embryo development in the alpine herb Caltha leptosepala (Ranunculaceae)." Canadian Journal of Botany 79, no. 5 (2001): 635–42. http://dx.doi.org/10.1139/b01-037.

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Caltha leptosepala D.C. (Ranunculaceae) is a perennial herb of alpine wet meadows. Seeds of this species have morphophysiological dormancy; they contain a rudimentary embryo that must undergo further development prior to germination. The embryo itself is also dormant and requires a physiological cue for resumption of development. We ask how C. leptosepala can break embryo dormancy and complete embryo development, germination, and seedling growth under the constraint of the extremely short alpine wet meadow growing season. Seeds were stratified at 2.5°C and collected at regular intervals for ge

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Johnson, Elmer W. "The Dispersed and Stratified Metropolis." Bulletin of the American Academy of Arts and Sciences 48, no. 7 (1995): 5. http://dx.doi.org/10.2307/3824328.

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MWORIA, J. K., J. I. KINYAMARIO, and J. M. GITHAIGA. "Influence of cultivation, settlements and water sources on wildlife distribution and habitat selection in south-east Kajiado, Kenya." Environmental Conservation 35, no. 2 (2008): 117–24. http://dx.doi.org/10.1017/s0376892908004670.

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SUMMARYIn Kenya, lands surrounding wildlife protected areas (PAs), referred to as dispersal areas, have undergone widespread land use changes, but these have been little studied. This study investigated impacts of different land use types on wildlife distribution and composition. Transect data from stratified random sampling based on land use and vegetation type were analysed using correlation and canonical correspondence analysis (CCA). Household density and cultivation intensity were negatively correlated with grass cover and were greatest on small-scale farms and lowest in a dedicated PA. T

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Hess, Aaron M., and Christopher R. Fielding. "Analysis of coastal-plain fluvial architecture and high-frequency stacking patterns in the Upper Cretaceous Masuk Formation, Utah, U.S.A.: Climate-driven cyclicity?" Journal of Sedimentary Research 90, no. 10 (2020): 1265–85. http://dx.doi.org/10.2110/jsr.2020.63.

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ABSTRACT Most sequence stratigraphic models are based on the premise that relative changes in sea level (RSL) control stacking patterns in continental-margin settings. An alternative hypothesis, however, is that upstream factors, notably variations in relative water discharge (RQW) or the ratio of water to sediment discharge can influence or control stratal stacking patterns in fluvial systems. Sequence boundaries of RQW-driven systems differ from those driven by base-level fluctuations in that: 1) the depth of incision increases updip, and 2) rates of erosion are spatially uniform, leading to

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Lepore, S., and C. Scarpati. "New developments in the analysis of volcanic pyroclastic density currents through numerical simulations of multiphase flows." Solid Earth Discussions 4, no. 1 (2012): 173–202. http://dx.doi.org/10.5194/sed-4-173-2012.

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Abstract. A granular multiphase model has been used to evaluate the action of differently sized particles on the dynamics of fountains and associated pyroclastic density currents. The model takes into account the overall disequilibrium conditions between a gas phase and several solid phases, each characterized by its own physical properties. The dynamics of the granular flows has been simulated by adopting a Reynolds Average Navier-Stokes model for describing the turbulence effects. Numerical simulations have been carried out by using different values for the eruptive column temperature at the

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