Global Positioning System as a tool for ecosystem studies at the landscape level: an application in the Spanish Mediterranean

Zavala, Ignacio; Zavala, M.

doi:10.1016/0169-2046(93)90088-u

Cited by 3 publications

(4 citation statements)

References 1 publication

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“…Prevalence infection rates were 45 and 17%, in AI and AII, respectively. In AI, Juniperus was not the dominant genus, but was dominant in AII where there was no significant woody understory (Zavala and Zavala ). Host community composition can fundamentally influence the establishment and prevalence of infection (Holt et al.…”

Section: Discussionmentioning

confidence: 94%

“…a). Arceuthobium oxycedri was found parasitizing Juniperus oxycedrus in this area (Zavala and Zavala ). The first plot (hereafter ‘AI’) was a 24.98 ha, near the centre of the park, located at 1000 m.a.s.l., with high capacity for local agricultural production and poor natural condition (production farming activities are allowed in this area).…”

Section: Methodsmentioning

confidence: 93%

“…The environmental differences between AI and AII could be affecting the vigour of J. oxycedrus individuals differently and this could be reflected in a differential dispersal of A. oxycedri in each area. In plot AI, affected trees had below‐average vigour and were heavily infected, while in plot AII, trees with average vigour were affected in a different way by the dwarf mistletoe (Zavala and Zavala ).…”

Section: Discussionmentioning

confidence: 99%

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Factors influencing the dispersion ofArceuthobium oxycedriinCentralSpain: evaluation with a new null model for marked point patterns

et al. 2016

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The dwarf mistletoe, Arceuthobium oxycedri, is found on populations of Juniperus oxycedrus, in central Spain. This species can have negative effects on the physiology of its host, including mortality. Understanding the mechanisms that control its distribution and dispersal is critical to assessing its potential for spread. We assessed dwarf mistletoe distribution within a population of J. oxycedrus, including infected and uninfected host individuals. A new null model of parasitic dispersion was built using two dispersal kernel forms that were simulated with lower and upper envelopes for second-order functions to summarize a point pattern, such as Ripley's K, nearest-neighbour distribution and pair correlation functions. Nine dispersal scenarios were constructed with half-bandwidth kernels (10, 20, 30 m) and initial population of infected trees (P 0 = 05, 10 and 20). These scenarios were compared with the observed pattern and evaluated using the goodnessof-fit test. Significant differences at short distance (r < 10 m) were found between the observed pattern and simulated patterns, corresponding to the range of seed dispersal of the dwarf mistletoe. Interactions between infected and uninfected hosts patterns at all scales were identified, suggesting that A. oxycedri uses other mechanisms in addition to ballistic seed shooting as secondary dispersal agents to spread to distances greater than 20 m. Given that the seed characteristics facilitate dispersal by adhesion, we infer that spread between host individuals is amplified by seed transport by birds or small mammals.

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Section: Discussionmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

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Factors influencing the dispersion ofArceuthobium oxycedriinCentralSpain: evaluation with a new null model for marked point patterns

et al. 2016

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“…Spatial structure of genetic diversity-A spatial coordinate matrix of plant individuals was formed with the three spatial components (x, y, and z coordinates). Geographic coordinates of each analyzed plant were estimated using the Differential Global Positioning System technique (Zavala and Zavala, 1993). The receiver was a 12-channel Trimble Pro XRS of L1 frequency and C/A code (Trimble, Sunnyvale, California, USA).…”

Section: Plant Materials and Rapd Amplification-plant Materials Was Colmentioning

confidence: 99%

Analysis of within‐population spatial genetic structure inAntirrhinum microphyllum(Scrophulariaceae)

Torres

Iriondo

Escudero

et al. 2003

American J of Botany

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Random amplified polymorphic DNA (RAPD) markers were used to study the spatial genetic structure in two populations (Bolarque and Entrepeñas) of endangered cliff specialist Antirrhinum microphyllum Rothm. (Scrophulariaceae). Mantel tests found no significant linear correlations between geographic and genetic data. However, redundancy analysis (RDA) models developed using the spatial data as the constraining matrix were highly significant, and spatial data explained 13.6% and 11.1% of total genetic variation in Bolarque and Entrepeñas, respectively. Moran's I correlograms and Mantel correlograms revealed a positive autocorrelation in the first distance class (15 m), which suggests a patchy distribution of genetic diversity. This distribution is consistent with the genetic vicinities that are expected from the territorial behavior of main pollinator Rhodanthidium sticticum (Megachilidae), the predominant short-distance seed dispersal, and the patchy spatial distribution of available safe sites. The gradient pattern obtained in Entrepeñas was consistent with standard isolation-by-distance models. However, a differential sinusoidal pattern was obtained in Bolarque, which would indicate a more frequent gene flow between patches and might be due to lower plant density there. The spatial genetic structure coexists with a strict self-incompatibility system in the species. Simplified RDA models obtained using a stepwise forward selection comprised the easting component in Entrepeñas and the easting and northing components in Bolarque. Similar results were obtained with directional correlograms. These differential patterns can be explained by the distinct spatial arrangement of the populations (linear and bidimensional in Entrepeñas and Bolarque, respectively).

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Mistletoes of North American conifers

Geils¹,

Cibrian-Tovar²,

Moody³

2002

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Global Positioning System as a tool for ecosystem studies at the landscape level: an application in the Spanish Mediterranean

Cited by 3 publications

References 1 publication

Factors influencing the dispersion ofArceuthobium oxycedriinCentralSpain: evaluation with a new null model for marked point patterns

Factors influencing the dispersion ofArceuthobium oxycedriinCentralSpain: evaluation with a new null model for marked point patterns

Analysis of within‐population spatial genetic structure inAntirrhinum microphyllum(Scrophulariaceae)

Mistletoes of North American conifers

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