La familia Bromeliaceae en México

Background: Bromeliaceae family in Mexico has been the object of interest by botanists since 1789; their systematic study was approached from the 1970s onwards, and now there are significant advances in its taxonomic-floristic knowledge.Question: How many and which species of Bromeliaceae occur in Mexico? How they are distributed, and how many are endemic?Study site: México, 1887-2017.Methods: Based on the study of the Mexican Bromeliaceae, including botanical collection, literature review, and revision, analysis and determination of specimens in 50 herbaria, data about species richness, Mexican endemics, and distribution of their taxa in the country, were obtained.Results: In Mexico are represented four of the eight subfamilies of Bromeliaceae, 19 genera, 422 species, and 8 infraespecific taxa. The genera with the highest number of species in the country are Tillandsia (230/54.5 %), Hechtia (71/16.8 %) and Pitcairnia (50/11.8 %). 318 of the Bromeliaceae species are endemics to Mexico, as well as Ursulaea and Viridantha genera; 172 species are microendemic. The entity with the highest number of taxa is Oaxaca, followed by Chiapas, Veracruz and Guerrero. Tlaxcala and Baja California Sur have the lowest species number. Baja California, Baja California Sur, Campeche, Ciudad de México, San Luis Potosí, Sonora, Tabasco y Tlaxcala have not strict endemic taxa.Conclusion: Although progress in the knowledge of Mexican Bromeliaceae has been constant, exploration and recollection work is still required before concluding the Mexican bromeliad flora. It is also necessary to promote studies considering aspects of conservation and sustainable use.

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Methodological aspects in the study of species richness, diversity and homotony of grass cover

Plant Soil and Environment ◽

10.17221/3191-pse ◽

2008 ◽

Vol 53 (No. 1) ◽

pp. 33-41 ◽

Cited By ~ 1

Author(s):

F. Klimeš ◽

L. Kolář ◽

J. Květ ◽

W. Opitz von Boberfeld ◽

H. Laser

Keyword(s):

Species Richness ◽

Species Diversity ◽

Plant Species ◽

Species Number ◽

Regression Equations ◽

Grass Cover ◽

Methodological Aspects ◽

The Relationship ◽

Number Of Plant Species

This work proposes a new method for the assessment of species richness, diversity, and homotony in related vegetation relevés of grass swards. Hypothetical vegetation relevés with identical species number but differing constancy were generated to compare the techniques describing the species variety and diversity. By calculating these theoretical values in combination with data from real swards of Alopecuretum meadows, it has been shown that the determination of the constancy of particular species is essential for the evaluation of species diversity of grass swards. The relationship between the share of different combinations of vegetation relevés in the whole sample and corresponding total number of plant species were expressed by generating regression equations and the mid values of these curves were worked out and evaluated for individual sets of relevés; it was then possible to create homotony/heterotony indices for these sets. The indices of heterotony can be used, e.g., for expressing biotope diversity within a set of vegetation relevés from different stands.

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Primeros registros de Erythemis vesiculosa (Fabricius, 1775; Odonata: Libellulidae) y de Ischnura barberi Currie, 1903 (Odonata: Coenagrionidae) para Baja California Sur, México/Fisrt records of Erythemis vesiculosa (Fabricius, 1775; Odonata: Libellulidae) and Ischnura barberi Currie, 1903 (Odonata: Coenagrionidae) from Baja California Sur, Mexico

ACTA ZOOLÓGICA MEXICANA (N S ) ◽

10.21829/azm.2015.3131099 ◽

2015 ◽

Vol 31 (3) ◽

pp. 502

Author(s):

Gerardo Marrón ◽

Roberto Carmona ◽

Adriana Hernández-Álvarez

Keyword(s):

Baja California ◽

The State ◽

Baja California Sur ◽

Number Of Species ◽

San Pedro ◽

Sewage Ponds

We report the first records of two species of Odonata for Baja California Sur. An individual of Erythemis vesiculosa was in the southern part of the state at San Pedro del Palmar, an oasis near Todos Santos, 1 October 2014, and a couple of Ischnura barberi were in the northern part of the state at the Guerrero Negro sewage ponds 21 October 2014; both were photographed. These observations increase to 57 the number of species of the order Odonata recorded in BajaCalifornia Sur.

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Diversification and germ-line determination

Paleobiology ◽

10.1017/s0094837300012069 ◽

1988 ◽

Vol 14 (4) ◽

pp. 313-321 ◽

Cited By ~ 13

Author(s):

Leo W. Buss

Keyword(s):

Genetic Variation ◽

Species Richness ◽

Fossil Record ◽

Germ Line ◽

Strong Association ◽

Species Number ◽

Evolutionary Diversification ◽

Similar Association

The species richness of extant metazoan phyla displays a strong association with the ontogenetic timing of germ-line determination. Taxa with early ontogenetic determination of the germ-line are characterized by low species number relative to taxa with late or variable determination. A test for a similar association in fossil taxa is compromised by the fact that all phyla displaying early determination of the germ-line are small, soft-bodied groups which lack a reliable fossil record. To the extent that this correlation reflects causality, patterns of evolutionary diversification have been decidedly non-random. The fact that ontogenetic timing of germ-line determination defines the extent to which genetic variation arising during the course of ontogeny may be inherited suggests a possible causal foundation for the pattern.

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GEOMETRICAL EFFECT OF ISLAND SHAPE ON THE SPECIES RICHNESS

Fractals ◽

10.1142/s0218348x99000359 ◽

1999 ◽

Vol 07 (04) ◽

pp. 353-357 ◽

Cited By ~ 4

Author(s):

KAZUHITO YAMASAKI ◽

SATOSHI CHIBA ◽

HIROYUKI NAGAHAMA

Keyword(s):

Species Richness ◽

Power Law ◽

Land Snail ◽

The Other ◽

Island Area ◽

Number Of Species ◽

Ryukyu Arc ◽

Species Area ◽

Geometrical Effect

We introduce a new immigration model which merges two aspects of island length. One aspect is determination of colonizer's chance of reaching recipient island, and the other is constraint on the statistical self-affinity (anisotropy) of island shapes. This immigration model derives the famous power law on species-area (SA) relation, which shows that the number of species on the anisotropic island is constrained by not only the size of the island area but also the shape of the island. From this viewpoint, we analyze an SA curve of the land snail fauna in Ryukyu arc, Japan. Moreover, we show that species of the most previous studies have immigrated along the island chain due to the stepping-stone dispersal.

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Pycnogonids from marine docks located along the west coast of the Gulf of California, Mexico

Zootaxa ◽

10.11646/zootaxa.4938.2.1 ◽

2021 ◽

Vol 4938 (2) ◽

pp. 151-195

Author(s):

ANGEL DE LEÓN-ESPINOSA ◽

JESUS ANGEL DE LEÓN-GONZALEZ ◽

JAIME GÓMEZ-GUTIÉRREZ

Keyword(s):

Species Richness ◽

West Coast ◽

Gulf Of California ◽

Baja California ◽

Abundant Species ◽

Nominal Species ◽

Baja California Sur ◽

The West ◽

Reduced Body ◽

Intermittent Sampling

Sea spiders (Class Pycnogonida Latreille, 1810) are chelicerate arthropods, with an extraordinarily reduced body armed with eight to twelve elongated legs. A literature review of taxonomic and ecological studies of pycnogonids from Mexico identified 49 nominal species (~3.6% out of 1,335 species described worldwide). This low species richness is likely caused by limited taxonomic research and intermittent sampling and research efforts initially carried out by foreign scientists (1893–1996) and later by Mexican scientists. The present study investigates the latitudinal gradient of species richness of the pycnogonids associated with nine marine docks located between Cabo San Lucas (22°53’N) and Santa Rosalía (26°58’N) along the west coast of the Gulf of California, 22°53’N Mexico and provides a detailed morphological re-description of each nominal species using light and scanning electron microscopy. Nine nominal pycnogonid species and one unidentified species in the genus Tanystylum were collected and identified from the biological samples collected between 2011–2017. The highest pycnogonid species richness was recorded at Bahía de La Paz (seven species, 24°14’N) and the lowest species richness at Cabo San Lucas (one species) without an evident latitudinal species richness gradient. Anoplodactylus californicus Hall, 1912 and Ammothella spinifera Cole, 1904 were the most abundant species (52% of the total number of individuals). Tanystylum occidentale (Cole, 1904) and Nymphon apheles Child, 1979 were new geographical records for Mexico and Ammothella symbia Child, 1979 and A. californicus were new records for Baja California Sur state. Adding these new geographical records of pycnogonids increased the species richness previously recorded at Baja California Sur from 20 to 24 nominal species and for Mexico, the species richness increased from 49 to 51 nominal species.

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Determination of the Fish Community Structure of an Intertidal Rocky Zone of the Pacific Coast of Baja California Sur

Open Journal of Marine Science ◽

10.4236/ojms.2022.121001 ◽

2022 ◽

Vol 12 (01) ◽

pp. 1-18

Author(s):

Laura E. Cota-Ortega ◽

Emelio Barjau-Gonzalez ◽

Juan Manuel López-Vivas ◽

José Ángel Armenta-Quintana ◽

Javier Aguilar-Parra ◽

...

Keyword(s):

Community Structure ◽

Fish Community ◽

Baja California ◽

Pacific Coast ◽

Baja California Sur ◽

Fish Community Structure ◽

The Pacific

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Fossil Woods from the El Cien Formation in Baja California Sur: Leguminosae

IAWA Journal ◽

10.1163/22941932-90000600 ◽

1994 ◽

Vol 15 (3) ◽

pp. 229-245 ◽

Cited By ~ 14

Author(s):

Sergio R. S. Cevallos-Ferriz ◽

Josefina Barajas-Morales

Keyword(s):

Systematic Study ◽

Wood Anatomy ◽

Baja California ◽

Early Miocene ◽

Fossil Flora ◽

South American ◽

Baja California Sur ◽

Late Oligocene ◽

Extant Taxon ◽

History Of

Three types of fossil woods with similarities to the Leguminosae are described, Mimosoxylon tenax (Felix) Müller-Stoll ' Mädel, Bajacalijomioxylon cienense Cevallos-Ferriz ' Barajas-Morales, gen. et sp. nov., and Copaijeroxylon matanzensis Cevallos-Ferriz ' Barajas-Morales, sp. nov. These woods are from the EI Cien Formation in Baja California Sur, Mexico, which is dated as Zemorrian-Saucesian, i.e., late Oligocene–early Miocene. Although two of the names of the fossil woods suggest affinity with a particular extant taxon, differences in some quantitative and qualitative features preclude their identification with a single extant taxon. The similarity among wood of some groups of extant Leguminosae and limited knowledge of character variability in woods of this family explains this taxonomie uncertainty. These fossil woods from Baja California underscore the need for an extensive systematic study of the wood anatomy of Leguminosae, add to the poorly known plant history of the Peninsula, suggest a tropical South American influence in the fossil flora of Baja Califomia, and indicate that the climate during the Zemorrian- Saucesian was different from the xeric conditions that prevail today in the area.

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Richness of epiphytic lichens in differently aged Picea abies plantations situated in the oceanic region of Central Norway

The Lichenologist ◽

10.1017/s0024282909007865 ◽

2009 ◽

Vol 41 (1) ◽

pp. 97-108 ◽

Cited By ~ 31

Author(s):

Olga HILMO ◽

Håkon HOLIEN ◽

Håkan HYTTEBORN ◽

Hilde ELY-AALSTRUP

Keyword(s):

Species Richness ◽

Picea Abies ◽

Stand Age ◽

Species Number ◽

Middle Aged ◽

Epiphytic Lichen ◽

Number Of Species ◽

Young Stand ◽

Oceanic Region ◽

Species Richness And Abundance

AbstractThis study aims to investigate patterns of species richness and abundance in relation to stand age in 71 Picea abies plantations, aged between 9 and 85 years, situated in the oceanic region of Central Norway. The study has shown that plantations within the oceanic spruce forests can support a relatively high number of epiphytic lichen species. Some of the oldest plantations hosted several old-forest associated species, e.g. Hypogymnia vittata, Lobaria pulmonaria, Pseudocyphellaria crocata and Ramalina thrausta. The number of species was influenced significantly by stand age and increased rapidly in stands <20 years old. Stands >30 years old showed no clear increase in species number, except for a high number of species in the two oldest stands. The colonization pattern could be characterized as an additional entrance of species, rather than by a replacement sequence. The probability of occurrence increased steeply at young stand ages (<20 years) for Bryoria spp., Cavernularia hultenii, Platismatia glauca, Parmelia sulcata and Usnea spp. A lower rate of colonization was characteristic for Alectoria sarmentosa, Parmelia saxatilis and Platismatia norvegica. The cover of foliose lichens on the branches showed an almost unimodal response to stand age. The cover of lichens was highest on branches in middle-aged plantations. The reason for the lower lichen cover in late successional stages, compared to middle-aged stands, could be due to reduced light in the lower canopy of mature plantations. Increased rotation cycle, creation of gaps and short distance to sources of propagules are factors suggested to promote species richness and abundance in forest plantations.

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