Treefrogs in the family Hylidae make up almost 40% of the anurans in Mexico; however, beyond monographic work published >50 yr ago, we still know very little about their reproductive ecology. Herein, we investigated reproductive traits and compared life-history patterns among three hylid treefrogs distributed along Mexico's Pacific Lowlands, a biogeographically unique faunal region threatened by sea level rise. We examined museum specimens of the Mexican Leaf Frog (Agalychnis dacnicolor, n = 200), the Lowland Burrowing Frog (Smilisca fodiens, n = 340), and the Mexican Shovel-headed Treefrog (Triprion spatulatus, n = 336) collected during 1902–1965 from nine Mexican states. Adult males were smaller than females in all three species. Testes were largest in July and August, and gravid females were most common during July–August and largely absent by September. Juveniles were present from July to September. Gravid females exhibited positive relationships between body size and clutch size, with larger A. dacnicolor females also having larger eggs. Growth was difficult to discern because most samples were seasonally restricted, but unpublished collectors' notes revealed rapid growth to metamorphosis in T. spatulatus. Geographic variation in body size exhibited opposite patterns between A. dacnicolor and S. fodiens, whereas T. spatulatus had no clear relationship with geography. We provide the most comprehensive data on reproduction for these three treefrog species to date, including the first clutch size estimates for two of them addressing critical gaps in their life history and paving the way for a more complete understanding of life-history variation in Mexican hylids.

Rickettsia spp. in ticks from a tropical dry forest reserve on Mexico's Pacific Coast

This study presents new evidence for long-term variability in the late Holocene North American Monsoon (NAM), Pacific coast of Mexico. We have carried out a rock magnetic study on two deep-sea sediment cores from the Pacific coast Pescadero Basin. The magnetic intensities estimate total magnetic material and are a proxy for total clastic sediment. Ratios of magnetic intensities estimate the grain size of magnetic material. The rock magnetic data show a decimeter scale, multi-decadal oscillation with fourteen cycles (A-N) over the last 1200 years. These oscillations reflect alternating intervals of stronger/coarser magnetic/clastic flux to the coastal ocean and intervals of weaker/finer magnetic flux. We think these variations are caused by variations in long-term dominance of the NAM; summer (wet) monsoons produce rainy conditions (with runoff) while winter (dry) monsoons produce significant offshore winds, increased upwelling/biological productivity. We can correlate our variability to two other published studies southeast of Pescadero Basin, coastal lake sediments in Laguna de Juanacatlan and a Juxtlahuaca Cave stalagmite. Both of these studies estimate local rainfall. We see evidence of the same pattern of multi-decadal rainfall-runoff variability in these records as we see in Pescadero Basin, which is synchronous to within ±25 years over the last 1200 years. The multi-dacadal pattern of hydrologic variability in all three records varies in cycle duration from ~90-years wet/dry cycles in the Little Ice Age (1400–1850 AD) to ~60-years cycles in the Medieval Climate Optimum (1100–1400 AD). This variability in cycle duration suggests some chaotic nature to the regional NAM climate pattern or some long-term non-linear forcing (PDO?).

Abstract Studies on the nutrition of wild populations of freshwater prawns, valuable in the determination of feeding habits and requirements, are scarce or inadequate. We analyzed the digestive tract of individuals of Macrobrachium tenellum (Smith, 1871) (Palaemonidae) sampled from three different coastal habitats (an estuary, a lagoon, and a river) in the southeastern Mexico Pacific coast to determine if individuals show any variations in their enzymatic activities. Prawns of different size (adult or juvenile) showed the most significant differences among them in the kind and amount of enzyme activity, whereas location and sex differences resulted in less significant differences. Results suggest that feeding habits and not habitat, are the main cause of differences between age classes.

The alga Digenea simplex (Wulfen) C. Agardh has been reported in forty seven Mexican localities. A detailed description of reproductive and morphological features is given hete for the first time. Its presence in Bahía Banderas, Nayarit (Pacific of Mexico) is a first record. The lack of sexual structures suggests that Mexican populations are monophasic. The only morphological difference observed in distant populations (Nayarit, Tamaulipas and Quintana Roo) is the size of individual plants (not statistically significant). There ís not enought evidence to support taxonomic seggregates.

Thirty-eight specimens collected along the intertidal zone from the southern Pacific of Mexico were examined, resulting in the extension of the distribution ranges for Eucinetops lucasii Stimpson, 1860 from Mazatlán, Sinaloa to San Agustín Bay, Oaxaca (approximately 1488 km southward), E. rubellulus Rathbun, 1923 from Maruata, Michoacán to La Tijera Beach, Oaxaca (802 km southward), and Uca musica Rathbun, 1914 from San Blas, Nayarit to La Encrucijada Biosphere Reserve, Chiapas (1763 km southward).

The confinement of some 120,000 Japanese Americans during World War II, often called the Japanese American internment, has been described as the worst official civil rights violation of modern U. S. history. Greg Robinson not only offers a bold new understanding of these events but also studies them within a larger time frame and from a transnational perspective. Drawing on newly discovered material, Robinson provides a backstory of confinement that reveals for the first time the extent of the American government's surveillance of Japanese communities in the years leading up to war and the construction of what officials termed concentration camps for enemy aliens. He also considers the aftermath of confinement, including the place of Japanese Americans in postwar civil rights struggles, the long movement by former camp inmates for redress, and the continuing role of the camps as touchstones for nationwide commemoration and debate. Most remarkably, A Tragedy of Democracy is the first book to analyze official policy toward West Coast Japanese Americans within a North American context. Robinson studies confinement on the mainland alongside events in wartime Hawaii, where fears of Japanese Americans justified Army dictatorship, suspension of the Constitution, and the imposition of military tribunals. He similarly reads the treatment of Japanese Americans against Canada's confinement of 22,000 citizens and residents of Japanese ancestry from British Columbia. A Tragedy of Democracy recounts the expulsion of almost 5,000 Japanese from Mexico's Pacific Coast and the poignant story of the Japanese Latin Americans who were kidnapped from their homes and interned in the United States. Approaching Japanese confinement as a continental and international phenomenon, Robinson offers a truly kaleidoscopic understanding of its genesis and outcomes.

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ABSTRACT The understanding of genetic connectivity among populations is important for the management of fisheries, particularly in overexploited benthic species such as the pink abalone Haliotis corrugata, which might have limited dispersal because of a short-term pelagic larval stage. Eight microsatellite DNA loci (Hco15, Hco16, Hco19, Hco22, Hco47, Hco97, Hco194, and Hka56) from specimens caught at five locations from the northeastern Pacific of Mexico and the United States were examined. H. corrugata showed a low to moderate genetic diversity. Most loci from the five sampling sites were in Hardy-Weinberg equilibrium, except for Hco47, which showed null alleles. Hierarchical AMOVA from seven loci showed highly significant population divergence between San Clemente Island and the Mexican locations (F ST = 0.021, P < 0.001) but not among Mexican subpopulations. The prevailing explanation for such divergence is the historical isolation by distance, but the presence of an oceanographic barrier (Southern Cal...

Book Review| February 01 2009 Review: Iron Horse Imperialism: The Southern Pacific of Mexico, 1880–1951, by Daniel Lewis Iron Horse Imperialism: The Southern Pacific of Mexico, 1880–1951. By Daniel Lewis. (Tucson, University of Arizona Press, 2007. xv + 181 pp. $35) Richard White Richard White Stanford University Search for other works by this author on: This Site PubMed Google Scholar Pacific Historical Review (2009) 78 (1): 144–145. https://doi.org/10.1525/phr.2009.78.1.144 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation Richard White; Review: Iron Horse Imperialism: The Southern Pacific of Mexico, 1880–1951, by Daniel Lewis. Pacific Historical Review 1 February 2009; 78 (1): 144–145. doi: https://doi.org/10.1525/phr.2009.78.1.144 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentPacific Historical Review Search This content is only available via PDF. © 2009 by the Regents of the University of California Article PDF first page preview Close Modal You do not currently have access to this content.

Journal Article Iron Horse Imperialism: The Southern Pacific of Mexico, 1880–1951 Get access Iron Horse Imperialism: The Southern Pacific of Mexico, 1880–1951. By Lewis Daniel. (Tucson: University of Arizona Press, 2007. xviii + 179 pp. Illustrations, map, notes, bibliography, index. $35.00.) William E. French William E. French University of British Columbia Search for other works by this author on: Oxford Academic Google Scholar Western Historical Quarterly, Volume 40, Issue 1, Spring 2009, Pages 102–103, https://doi.org/10.1093/whq/40.1.102 Published: 01 February 2009

Journal Article Daniel Lewis. Iron Horse Imperialism: The Southern Pacific of Mexico, 1880–1951. Tucson: University of Arizona Press. 2007. Pp. xv, 179. $35.00 Get access Daniel Lewis. Iron Horse Imperialism: The Southern Pacific of Mexico, 1880–1951. Tucson: University of Arizona Press. 2007. Pp. xv, 179. $35.00. Rodney D. Anderson Emeritus Rodney D. Anderson Emeritus Florida State University Search for other works by this author on: Oxford Academic Google Scholar The American Historical Review, Volume 113, Issue 3, June 2008, Pages 881–882, https://doi.org/10.1086/ahr.113.3.881 Published: 01 June 2008

Herein we discuss the results of a study of the structure, evolution and break‐up of an internal tidal wave under conditions of a steep shelf with a slope close to that of the internal wave characteristic. Measurements were taken in Navidad Bay on Mexico's Pacific Coast. We demonstrate that, under the conditions of homogeneous density stratification, the internal tidal wave releases its energy and collapses due to resonant excitation in a sequence of third tidal harmonics. Those harmonics generate multiscale vertical bilateral steps that follow at regular intervals and feature coherent oscillations in the form of vertical jets that cover the entire water column.

At the Second International Billfish Symposium in Kona, it was reported that little was known about the social and economic aspects of recreational billfish fisheries. There was plenty of background, some good questions, but few answers. There had been little history of social science involvement in fisheries management at the time and even less in billfish fisheries. Whether authorized or not, fishery management decisions worldwide are going to be made on the basis of ‘best available’ social and economic understanding. Unfortunately, the values held by many in the billfish angler community are not likelyto be well represented in the mix for various reasons. Research in the USA and in Latin America over the past 13 years hasprovided an understanding of the billfish angler constituency, its commitment to catch and release and support for resource conservation, its local and regional impacts on tourism economies, and its willingness-to-pay above andbeyond trip costs (a measure of user value) in the US Atlantic, Puerto Rico, Costa Rica and Mexico Pacific. Although knowledge of the recreational billfish fishery has improved, comparatively little is known about the social and economic benefits associatedwith commercial (direct and bycatch) billfish fisheries. With little more than dockside prices available in many localities, it is difficult to know their value in comparison with recreational fisheries and the possible trade-offs associated with various management measures. In addition to describing what is still not known, this paper will identify a future research agenda in this area.

Macroalgae as Biomonitors of Heavy Metal Availability in Coastal Lagoons from the Subtropical Pacific of Mexico

Species of the diatom genus Pseudo-nitzschia are common in the marine phytoplankton world-wide. Some species of this genus have been proved to be source of domoic acid (DA), a powerful toxin causing Amnesic Shellfish Poisoning (ASP) in humans and probably mass mortality in sea birds and mammals. Net plankton samples obtained during several cruises and seasons from the Pacific coasts of Mexico: western coasts of Baja California, Gulf of California, coasts of the tropical Pacific of Mexico (including the Gulf of Tehuantepec), were analyzed to study the species of the diatom genus Pseudo-nitzschia. Four species ( P. australis, a presumed toxic species, P. fraudulenta, P. lineola, P. pungens) and one former species of the genus, Nitzschia americana were recorded and studied by light and electron microscopy. The most common species was P. pungens, widely distributed along the Pacific coasts of Mexico. All other species appeared occasionally and in low relative abundances. The probable misidentification of P. australis as P. seriata is discussed, as well as the presence of another potentially toxic species, P. delicatissima, in the Gulf of California. No case of toxicity (ASP) has been fully documented and therefore related to toxic Pseudo-nitzschia species in the Gulf of California.

Feasibility of seawater desalination to solve water shortage problems of the Salina Cruz (PEMEX) Refinery

Research Article| December 01 1979 Dutch Ships on Mexico's Pacific Coast, 1747 JOHN E. WILLS,, JR. JOHN E. WILLS,, JR. Search for other works by this author on: This Site PubMed Google Scholar Southern California Quarterly (1979) 61 (4): 337–350. https://doi.org/10.2307/41170839 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation JOHN E. WILLS,; Dutch Ships on Mexico's Pacific Coast, 1747. Southern California Quarterly 1 December 1979; 61 (4): 337–350. doi: https://doi.org/10.2307/41170839 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentSouthern California Quarterly Search This content is only available via PDF. © Copyright 1979 The Historical Society of Southern California Article PDF first page preview Close Modal You do not currently have access to this content.