Population structure of Pinus nelsoni Shaw, an endemic pinyon pine in Tamaulipas, Mexico

Suzán-Azpiri, Humberto; Martínez-Ávalos, José Guadalupe; Villa-Melgarejo, Sandro; Franco, Miguel

doi:10.1016/s0378-1127(01)00617-x

Cited by 13 publications

(16 citation statements)

References 8 publications

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“…Interval between large seed crops for P. pumila (3 years) and for P. nelsonii (2-3 years) were estimated from Kajimoto (2002) and Suzán-Azpiri (2002), respectively. Intervals for P. durangensis (W. S. Dvorak, pers.…”

Section: Environmental and Biological Datamentioning

confidence: 99%

Evolution of Genome Size in Pines (Pinus) and Its Life-History Correlates: Supertree Analyses

et al. 2004

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Abstract. Genome size has been suggested to be a fundamental biological attribute in determining life-history traits in many groups of organisms. We examined the relationships between pine genome sizes and pine phylogeny, environmental factors (latitude, elevation, annual rainfall), and biological traits (latitudinal and elevational ranges, seed mass, minimum generation time, interval between large seed crops, seed dispersal mode, relative growth rate, measures of potential and actual invasiveness, and level of rarity). Genome sizes were determined for 60 pine taxa and then combined with published values to make a dataset encompassing 85 species, or 70% of species in the genus. Supertrees were constructed using 20 published source phylogenies. Ancestral genome size was estimated as 32 pg. Genome size has apparently remained stable or increased over evolutionary time in subgenus Strobus, while it has decreased in most subsections in subgenus Pinus. We analyzed relationships between genome size and life-history variables using cross-species correlations and phylogenetically independent contrasts derived from supertree constructions. The generally assumed positive relation between genome size and minimum generation time could not be confirmed in phylogenetically controlled analyses. We found that the strongest correlation was between genome size and seed mass. Because the growth quantities specific leaf area and leaf area ratio (and to a lesser extent relative growth rate) are strongly negatively related to seed mass, they were also negatively correlated with genome size. Northern latitudinal limit was negatively correlated with genome size. Invasiveness, particularly of wind-dispersed species, was negatively associated with both genome size and seed mass. Seed mass and its relationships with seed number, dispersal mode, and growth rate contribute greatly to the differences in life-history strategies of pines. Many life-history patterns are therefore indirectly, but consistently, associated with genome size.

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Section: Environmental and Biological Datamentioning

confidence: 99%

Evolution of Genome Size in Pines (Pinus) and Its Life-History Correlates: Supertree Analyses

et al. 2004

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“…To find the invasion speed, c  , we solve Equation (27) numerically for u and then use (26). Both M(u) and M'(u) were approximated for specific u using the trapezoid rule; roots of ( ) F u were found using fzero in MATLAB.…”

Section: Analysis Of Invasion Speedsmentioning

confidence: 99%

“…For pinyon we use a generation time G ~ 20 years from [26]. To estimate R 0 we refer to [24], who determined that only 6 pinyon survived the nineteenth-century fire on their site.…”

Section: Migration Potential Of Pinyon and Junipermentioning

confidence: 99%

Mathematical Model of Seed Dispersal by Frugivorous Birds and Migration Potential of Pinyon and Juniper in Utah

Neupane¹,

Powell²

2015

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Seed dispersal of juniper and pinyon is a process in which frugivorous birds play an important role. Birds either consume and digest seeds or carry and cache them at some distance from the source tree. These transported and settled seeds can be described by a dispersal kernel, which captures the probability that the seed will move a certain distance by the end of the process. To model active seed dispersal of this nature, we introduce handling time probabilities into the dispersal model to generate a seed digestion kernel. In the limit of no variability in handling time the seed digestion kernel is Gaussian, whereas for uniform variability in handling time the kernel approaches a Laplace distribution. This allows us to standardize spatial movement (diffusion) and handling time (peak settling rate) parameters for all three distributions and compare. Analysis of the tails indicates that the seed digestion kernel decays at a rate intermediate between Gaussian and Laplace seed kernels. Using this seed digestion kernel, we create an invasion model to estimate the speed at which juniper and pinyon forest boundaries move. We find that the speed of seed invasion corresponding to the digestion kernel was faster than seeds resulting from Laplace and Gaussian kernels for more rapidly digested seeds. For longer handling times the speeds are bounded between the Laplace (faster) and Gaussian (slower) speeds. Using parameter values from the literature we evaluate the migration potential of pinyon and juniper, finding that pinyon may be able to migrate up to two orders of magnitude more rapidly, consistent with observations of pine migration during the Holocene.

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“…are six Mexican pines catalogued as threatened or endangered species [9] due to their restricted distribution and low population density. These pines occupy diverse habitats, present a variety of ecological roles, and cover a wide range of environments differing in altitude, precipitation, temperature, and soil conditions [10][11][12][13]. Spatial modeling and GIS techniques provide the tools to create current and future scenarios of possible suitable areas of distribution according to available databases and information about these species.…”

Section: Introductionmentioning

confidence: 99%

Current and Potential Spatial Distribution of Six Endangered Pine Species of Mexico: Towards a Conservation Strategy

Sánchez¹,

Miranda²,

González-Hernández³

et al. 2018

Forests

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Mexico is home to the highest species diversity of pines: 46 species out of 113 reported around the world. Within the great diversity of pines in Mexico, Pinus culminicola Andresen et Beaman, P. jaliscana Perez de la Rosa, P. maximartinenzii Rzed., P. nelsonii Shaw, P. pinceana Gordon, and P. rzedowskii Madrigal et M. Caball. are six catalogued as threatened or endangered due to their restricted distribution and low population density. Therefore, they are of special interest for forest conservation purposes. In this paper, we aim to provide up-to-date information on the spatial distribution of these six pine species according to different historical registers coming from different herbaria distributed around the country by using spatial modeling. Therefore, we recovered historical observations of the natural distribution of each species and modelled suitable areas of distribution according to environmental requirements. Finally, we evaluated the distributions by contrasting changes of vegetation in the period 1991–2016. The results highlight areas of distribution for each pine species in the northeast, west, and central parts of Mexico. The results of this study are intended to be the basis of in situ and ex situ conservation strategies for the endangered Mexican pines.

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Population structure of Pinus nelsoni Shaw, an endemic pinyon pine in Tamaulipas, Mexico

Cited by 13 publications

References 8 publications

Evolution of Genome Size in Pines (Pinus) and Its Life-History Correlates: Supertree Analyses

Evolution of Genome Size in Pines (Pinus) and Its Life-History Correlates: Supertree Analyses

Mathematical Model of Seed Dispersal by Frugivorous Birds and Migration Potential of Pinyon and Juniper in Utah

Current and Potential Spatial Distribution of Six Endangered Pine Species of Mexico: Towards a Conservation Strategy

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