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741 results for “Baja California”
Figures 28–32. Polyphylla avittata 28 in Natural history, ecology, and conservation of the genus Polyphylla Harris, 1841. 1. New species from the southwestern United States and Baja California, Mexico, with notes on distribution and synonymy (Coleoptera: Scarabaeidae: Melolonthinae)
Figures 28–32. Polyphylla avittata 28) Distribution of P. avittata Hardy and Andrews (solid circles) and P. uteana Tanner (black vertical lines). 29–32) Variation of male. 29) Hurricane Sand Dunes, Washington Co., UT (topotype). 30) Goblin Valley State Park, Emory Co., UT. 31) Grand Staircase- Escalante National Monument, Garfield Co., UT. 32) 3 miles N of Moab, Grand Co., UT.
Figures 48–49. Polyphylla. Males. 48 in Natural history, ecology, and conservation of the genus Polyphylla Harris, 1841. 1. New species from the southwestern United States and Baja California, Mexico, with notes on distribution and synonymy (Coleoptera: Scarabaeidae: Melolonthinae)
Figures 48–49. Polyphylla. Males. 48) Polyphylla mescalerensis Young [topotype]. Mescalero Sand Dunes, Chaves County, New Mexico. 49) Polyphylla sp. incertae. Cerro San Luis, Chihuahua, Mexico.
Figures 50–57. Habitats. 50–51 in Natural history, ecology, and conservation of the genus Polyphylla Harris, 1841. 1. New species from the southwestern United States and Baja California, Mexico, with notes on distribution and synonymy (Coleoptera: Scarabaeidae: Melolonthinae)
Figures 50–57. Habitats. 50–51) Polyphylla anivallis. Animas Valley Sand Dunes, Hidalgo Co., NM. 52–53) Polyphylla koso. Coso Mountains, Inyo Co., CA. 52) Coso Bridge. 53) Mill Springs Canyon. 54–55) Polyphylla morroensis. Baywood Fine Sands, San Luis Obispo Co., CA. 56–57) Polyphylla socorriana. El Socorro Sand Dunes, Baja California, MX.
Figures 42–47 in Natural history, ecology, and conservation of the genus Polyphylla Harris, 1841. 1. New species from the southwestern United States and Baja California, Mexico, with notes on distribution and synonymy (Coleoptera: Scarabaeidae: Melolonthinae)
Figures 42–47. Described females and comparative male. Polyphylla monahansensis Hardy and Andrews. 42) Male. 43–44) Female. Polyphylla stellata Young. 45) Male. 46–47) Female.
Figures 1–6. Phyllophaga baja. 1 in A new Phyllophaga (Listrochelus) timida group species from Baja California Sur (Coleoptera: Scarabaeidae: Melolonthinae)
Figures 1–6. Phyllophaga baja. 1) Male dorsal habitus. 2–4) Male genitalia: 2) Dorsal view. 3) Ventral view. 4) Lateral view. 5) Female mesotarsal claw. 6) Male protarsal claw.
Comparative phylogeography of phrynosomatid lizards in Baja California: Asynchronous divergences and expansion of <em>Callisaurus draconoides</em> across the North American deserts
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FIGURE 1 in Description of a new species of Caenotus Cole (Diptera: Scenopinidae) from Baja California Sur, Mexico, with a review of the genus
FIGURE 1. Caenotus tanyrhynchus spec. nov., three quarter view of female head.
Data from: Echericetus novellus n. gen. n. sp. (Cetacea: Mysticeti: Eomysticetidae), an Oligocene baleen whale from Baja California Sur, Mexico
<p><span>Among the several evolutionary lineages of the baleen whales (Mysticeti), the eomysticetids are an ancient successful family that retain possibly non-functional teeth and functional baleen, a transitional stage between toothed and baleen-assisted filter-feeding mysticetes. However, the patchy fossil record leaves gaps in eomysticetids palaeobiology interpretations but their diversity and widespread geographical distribution can be a relevant proxy to understanding the evolution of crown Mysticeti. Here, we describe a new baleen whale, <em>Echericetus novellus</em> n. gen. n. sp., from the Oligocene of Mexico (slightly older than 27.95 million years ago). This new taxon has morphological features that show its affinity to Eomysticetidae, such as the intertemporal region longer than wide, elongate and oval temporal fossa, and a well-developed and lobate coronoid process of the mandible. Similarly, our cladistic analyses confirm the inclusion of <em>Echericetus</em> in the Eomysticetidae. <em>Echericetus</em> reinforces our notion of the eomysticetid diversity and disparity. Geographically, the existence of <em>Echericetus</em> from Mexico also indicates that eomysticetids inhabited subtropical regions in the Northern Hemisphere. Lastly, our discovery of a new eomysticetid from the Oligocene of Mexico provides new insights into the distribution patterns and habitat use of Eomysticetidae, essential to further explain the demise of this transitional lineage between toothed and baleen-bearing whales.</span></p>
Fig. 1 in The herpetofauna of the Baja California Peninsula and its adjacent islands, Mexico: composition, distribution, and conservation status
Fig. 1. Geographic regions of the Baja California Peninsula, Mexico.
Fig. 10 in The herpetofauna of the Baja California Peninsula and its adjacent islands, Mexico: composition, distribution, and conservation status
Fig. 10. View of the Magdalena Region at La Purisima, Baja California Sur. Photo by Gerardo Marrón.
Sequencing data from: Divergent lineages in a young species: the case of Datilillo (Yucca valida), a broadly distributed plant from the Baja California Peninsula
<div> <div> <p><strong>Premise: </strong>Globally, barriers triggered by climatic changes have caused habitat fragmentation and population allopatric divergence. Across North America, oscillations during the Quaternary have played important roles in the distribution of wildlife. Notably, diverse plant species from the Baja California Peninsula in western North America, isolated during the Pleistocene glacial–interglacial cycles, exhibit strong genetic structure and highly concordant divergent lineages across their ranges. A representative plant genus of the peninsula is <em>Yucca</em>, with <em>Y. valida</em> having the widest range. Although a dominant species, it has an extensive distribution discontinuity between 26° N and 27° N, suggesting restricted gene flow. Moreover, historical distribution models indicate the absence of an area with suitable conditions for the species during the Last Interglacial, making it an interesting model for studying genetic divergence.<br>Methods: We assembled 4411 SNPs from 147 plants of <em>Y. valida</em> throughout its range to examine its phylogeography to identify the number of genetic lineages, quantify their genetic differentiation, reconstruct their demographic history and estimate the age of the species.<br>Results: Three allopatric lineages were identified based on the SNPs. Our analyses support that genetic drift is the driver of genetic differentiation among these lineages. We estimated an age of less than 1 million years for the common ancestor of <em>Y. valida</em> and its sister species.<br>Conclusions: Habitat fragmentation caused by climatic changes, low dispersal, and an extensive geographical range gap acted as cumulative mechanisms leading to allopatric divergence in <em>Y. valida</em>.</p> </div> </div>
Data for Bernard et al., "Melt-assisted deformation in the lower crust of an active plate boundary, Baja California" (2022)
<p>Archived LA-ICP-MS and EBSD data files for the Bernard et al. manuscript entitled, "Melt-assisted deformation in the lower crust of an active plate boundary, Baja California" (LITHOS, accepted 2022). EBSD data were acquired on an Oxford Instruments Symmetry EBSD detector on a FEI Apreo LoVac field emission gun scanning electron microscope at the University of California San Diego (UCSD) using a working distance between 26 to 28 mm and voltage of 20 kV. Trace elements were collected from polished thin sections using a Thermo Fisher Scientific iCAP Qc Inductively Coupled Plasma Mass Spectrometry (ICP-MS) with New Wave Research UP213 Laser Ablation system at UCSD. </p>
Replication data for: High-frequency variability induced in the Southern California Bight by a wind event in Sebastián Vizcaíno Bay, Baja California
<p>Replication data for Ramos-Musalem, K. , Gille, S. T., Cornuelle, B. D., & Mazloff, M. R. (2023) High-frequency variability induced in the Southern California Bight by a wind event in Sebastián Vizcaíno Bay, Baja California<em>, Journal of Geophysical Research: Oceans</em></p> <p><strong>Contents:</strong></p> <p><strong><code>1. Input/</code></strong>: Contains the necessary input files to re-run the MITgcm configuration provided here: <a href="https://github.com/anakarinarm/SVB_highFreqVar_paper/tree/main/MITgcm_config">https://github.com/anakarinarm/SVB_highFreqVar_paper/ </a>including the bathymetry, wind stress forcing, and initial temperature and salinity fields.</p> <p>MITgcmUV version: checkpoint67y</p> <p><strong>Sea surface height model results for 5 days of simulation in:</strong></p> <p><strong><code>2. 06_512x612x100_ORL_SVB/</code></strong>: Runs with Sebastian Vizcaino Bay.</p> <ul> <li><code>01_FebTS_SVB/</code>: Base run, February-like stratification</li> <li><code>02_barotropic_SVB/</code>: Constant T and S</li> <li><code>04_AugTS_SVB/</code> : August-like stratification</li> <li>grid_vars: grid variables (depth, land masks, horizontal and vertical spacing) </li> </ul> <p><strong><code>3. 06_512x612x100_ORL</code>:</strong> Runs without Sebastian Vizcaino Bay</p> <ul> <li><code>01_FebTS/</code>: Base run, February-like stratification</li> <li><code>02_barotropic/</code>: Constant T and S</li> <li><code>04_AugTS/</code>: August-like stratification</li> <li>grid_vars: grid variables (depth, land masks, horizontal and vertical spacing) </li> </ul> <p><strong>4. <code>saved_data</code>/:</strong> post-processed model results including calculations needed to reproduce the figures in the manuscript. The scripts used to obtain these files are available here: <a href="https://github.com/anakarinarm/SVB_highFreqVar_paper/tree/main/postprocessing">https://github.com/anakarinarm/SVB_highFreqVar_paper</a></p>
Data from: Echericetus novellus n. gen. n. sp. (Cetacea: Mysticeti: Eomysticetidae), an Oligocene baleen whale from Baja California Sur, Mexico
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Data from: Deep mitochondrial divergence in Baja California populations of an aquilopelagic elasmobranch: the golden cownose ray
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Implications of the last glacial maximum on the genetic diversity of six co-distributed taxa in the Baja California Peninsula
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Figure 7 in New biogeographical makeup for colonisation of the Baja California Peninsulaı with the description of a new Onthophagus (Coleoptera: Scarabaeidae: Scarabaeinae)
Figure 7. Distribution of O. cartwrighti (black dot) and closely related species (based on Howden and Cartwright 1963; Howden 1973; Anduaga and Halffter 1991b; and specimen labels of the Gonzalo Halffter Collection): O. arnetti Howden and Cartwright, 1963 (white triangle), O. browni (black triangle), and O. velutinus (white dot). These species illustrate the penetration of the Baja California Peninsula by the O. mexicanus species group, following the Mexican Plateau Paleoamerican sub-pattern.
Subspecies and Distribution. B. p. plicata Peters, 1867 - from C Sinaloa in Mexico to Nicaragua and NW Costa Rica. B. p. pallida Burt, 1948 - confined to S Sonora, N Sinaloa, and the S tip of Baja California Sur states in Mexico. in Emballonuridae
Subspecies and Distribution. B. p. plicata Peters, 1867 - from C Sinaloa in Mexico to Nicaragua and NW Costa Rica. B. p. pallida Burt, 1948 - confined to S Sonora, N Sinaloa, and the S tip of Baja California Sur states in Mexico.
Data from: Islands in the desert for cavity-nesting bees and wasps: ecology, patterns of diversity, and conservation at oases of Baja California peninsula
<p>Aims: The oases of Baja California peninsula (BCP) have been proposed as important hotspots of biodiversity that hold an exceptional richness in the middle of desert conditions. We provide the effect of habitat, climatic, biogeographic and anthropogenic disturbance on communities of cavity nesting taxa, emphasizing on bees, wasps and their natural enemies. Location: Baja California Peninsula, Northwest Mexico.</p> <p>Methods: In oases of BCP and desert neighbor environments, trap-nesting taxa were evaluated in response to factors affecting the nest abundance, richness, and community structure. We used statistical models to find the variables controlling the nest abundance and ecological analyses to determine the habitat effect on diversity under different scenarios of disturbance and latitude.</p> <p>Results: The nest abundance varied between bees and wasps, but solar irradiation and relative humidity influenced the abundance of both groups. In general, abundance and richness were higher in oases. Bees did not discriminate between oasis and desert habitats to nest and mud-daubing wasps were highly dependent of oases. However, there were exceptions in both groups. The degree of anthropogenic disturbance affected the species composition, richness, and natural enemies.</p> <p>Main conclusions: The oases of Baja California seem to be functioning as mesic islands into the desert, each oasis hosting a great and unique richness of cavity-nesting taxa. About 65% of nest abundance and 50% of species occurred exclusively in the oasis. Thus, at least 21 species could be threatened if the oases of BCP disappear in the future. Local conditions are shaping the community structure of species, but also large-scale factors, e.g. climate and biogeographic patterns seem to be influencing the community structure. Since habitat loss and fragmentation can be a major problem in most oases, strategies to maintain the ecosystem services of pollinators and predators should be included in the conservation programs of these fragile habitats.</p>
Data from: Contributions toward understanding the biodiversity of Passiflora in North America: updates and a new combination from the Baja California Peninsula, Mexico and vicinity
The Baja California Peninsula and surrounding landmasses harbor an abundant flora in an otherwise harsh and arid environment. Of the many plant groups native to this peninsular and insular region, passionflowers (Passiflora, Passifloraceae) are represented by a handful of taxa that all belong to a single lineage within the genus (section Dysosmia). Despite centuries of exploration and floristic research in the area, basic questions remain regarding this group—particularly the taxonomic status among the Passiflora arida complex. Using an extensive sampling of herbarium specimens and iNaturalist observations, the claims of endemism, habitat characteristics, and taxon boundaries were investigated. Peninsular endemism was confirmed for only one of the native Passiflora taxa (P. fruticosa), with an additional taxon (P. palmeri) considered near-endemic. Soil and climatic data revealed significant distinctions between the habitats of many of the native taxa as well as within the P. arida complex, corresponding mostly to precipitation and temperature variables. Geometric morphometric analyses showed little success in separating taxa based on leaf shape, indicating this line of evidence may not be a good indicator of taxon identity in this group of plants. Based on ecological differences and discrete macro- and micromorphological features, a varietal name is here synonymized and a new combination is proposed: Passiflora pentaschista.
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Allen Brain Atlas
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