Diversity of Small Mammals in the Pacific Coastal Desert of Peru and Chile and in the Adjacent Andean Area - Biogeography and Community Structure

1994 ◽  
Vol 42 (4) ◽  
pp. 527 ◽  
Author(s):  
PA Marquet
Keyword(s):  
Community Structure ◽  
Species Diversity ◽  
Small Mammals ◽  
Large Scale ◽  
Regional Scale ◽  
Desert Area ◽  
Evolutionary Processes ◽  
Coastal Desert ◽  
The Pacific ◽  
Similarities And Differences

Species diversity patterns of small mammals (sigmodontine rodents) in the Chilean-Peruvian Pacific coastal desert and adjacent Andean area (Puna) were analysed by means of latitudinal and altitudinal transects. The statistical analyses of the patterns show: (1) a wide variation in latitudinal species diversity, with a peak in the region where the Puna reaches its greatest areal extent; (2) the differentiation of at least four groups of distinct faunal elements resulting from the interaction of large-scale biogeographic, geological and evolutionary processes; (3) a positive correlation between species richness and altitude for the altitudinal transects located within the Pacific coastal desert area and Puna; and (4) a highly individualistic pattern of community structure at a regional scale. These results are discussed considering biogeographic, palaeoclimatic and evolutionary processes, such as the establishment of the Pacific coastal desert, and the existence of a major centre of species diversification in the Puna area. Similarities and differences between these community-level patterns and those in North American deserts are discussed.

scholarly journals A Statistical Framework to Identify the Influence of Large-Scale Weather Events on Regional Air Pollution

2011 ◽  
Vol 50 (12) ◽  
pp. 2376-2393 ◽  
Author(s):  
Angadh Singh ◽  
Ahmet Palazoglu
Keyword(s):  
Air Pollution ◽  
Large Scale ◽  
Regional Scale ◽  
Central Valley ◽  
Temporal Patterns ◽  
Pollution Levels ◽  
Statistical Framework ◽  
Weather Events ◽  
The Pacific ◽  
Regional Air Pollution

AbstractRegional air pollution episodes occur as a result of increased emissions and prevalence of conducive meteorological conditions. The frequency of occurrence of such favorable conditions on a regional scale may be influenced by large-scale climatic events like ENSO and the Pacific decadal oscillation (PDO). The scarcity of measurements of criteria pollutants, especially ozone and particulate matter (PM), prior to the last 10–15-yr period, limits the scope of observing the influence of climate variability during recent decades on regional pollution levels. The authors propose a novel statistical framework to utilize available measurements and characterize synoptic influences on regional PM pollution in California’s Central Valley during 1998–2008. The identified target conditions are used to develop a classification scheme to scan historical climate datasets dating back to 1948. The procedure identifies exceedance-conducive days during 1950–98, when no PM2.5 measurements were available. Temporal patterns in seasonal frequency of these identified exceedance-conducive days are investigated for temporal patterns driven by ENSO and PDO.

scholarly journals Large-scale metabarcoding analysis of epipelagic and mesopelagic copepods in the Pacific

2020 ◽  
Author(s):  
Junya Hirai ◽  
Aiko Tachibana ◽  
Atsushi Tsuda
Keyword(s):  
Community Structure ◽  
Environmental Conditions ◽  
Evolutionary History ◽  
Large Scale ◽  
The Arctic ◽  
Copepod Community ◽  
The Pacific ◽  
Low Latitudes ◽  
The Pacific Ocean ◽  
Epipelagic Layer

AbstractA clear insight into large-scale community structure of planktonic copepods is critical to understanding mechanisms controlling diversity and biogeography of marine taxa, owing to their high abundance, ubiquity, and sensitivity to environmental changes. Here, we applied a 28S metabarcoding approach to large-scale communities of epipelagic and mesopelagic copepods at 70 stations across the Pacific Ocean and three stations in the Arctic Ocean. Major patterns of community structure and diversity, influenced by water mass structures, agreed with results from previous morphology-based studies. However, large-scale metabarcoding approach could detected community changes even under stable environmental conditions, including changes in the north/south subtropical gyres and east/west areas within each subtropical gyre. There were strong effects of epipelagic environment on mesopelagic communities, and community subdivisions were observed in the environmentally-stable mesopelagic layer. In each sampling station, higher operational taxonomic unit (OTU) numbers and lower phylogenetic diversity were observed in the mesopelagic layer than in the epipelagic layer, indicating a recent rapid increase of species numbers in the mesopelagic layer. The phylogenetic analysis utilizing representative sequences of OTUs revealed trends of recent emergence of cold-water OTUs mainly distributed at high latitudes with low water temperatures. Conversely, high diversity of copepods at low latitudes was suggested to have been formed through long evolutionary history under high water temperature. The metabarcoding results suggest that evolutionary processes have strong impacts on current patterns of copepod diversity, and support the “out of the tropics” theory explaining latitudinal diversity gradients of copepods. Both diversity patterns in epipelagic and mesopelagic showed high correlations to sea surface temperature; thus, predicted global warming may have a significant impact on copepod diversity in both layers.Author SummaryMarine planktonic copepods are highly dominant and diverse, and revealing their community structure and diversity is important to understanding marine ecosystems. We used molecular-based metabarcoding to reveal a total of 205 copepod communities in the ‘sunlight’ or epipelagic layer (0– 200 m) and the ‘twilight’ or mesopelagic layer (200–500 m and 500–1,000 m), mainly in the Pacific Ocean (data for 70 stations), but also in the Arctic Ocean (data for three stations). Different copepod communities were found in each geographical region with different environmental conditions, including tropical, subtropical, transition, Kuroshio Current, California Current, subarctic and arctic areas. The metabarcoding method sensitively detected small changes of copepod community even in environmentally-stable subtropical ocean systems and the mesopelagic layer. A high diversity of copepods was detected at low latitudes, and copepod diversity was higher in the mesopelagic layer than in the epipelagic layer in each area. These diversity patterns were influenced by both evolutionary history and present environmental conditions. The copepod community in the mesopelagic layer was strongly influenced by environmental conditions in the epipelagic layer. Thus, predicted climate changes may affect marine ecosystems not only in the epipelagic layer but also in the mesopelagic layer.

Opposite effects of ocean temperature on survival rates of 120 stocks of Pacific salmon (Oncorhynchus spp.) in northern and southern areas

2002 ◽  
Vol 59 (3) ◽  
pp. 456-463 ◽  
Author(s):  
Franz J Mueter ◽  
Randall M Peterman ◽  
Brian J Pyper
Keyword(s):  
Large Scale ◽  
Pacific Salmon ◽  
Spatial Scales ◽  
Regional Scale ◽  
Survival Rates ◽  
Climatic Changes ◽  
Sea Surface ◽  
Ocean Temperature ◽  
Climate Anomalies ◽  
The Pacific

To improve the understanding of linkages between ocean conditions and salmon productivity, we estimated effects of ocean temperature on survival rates of three species of Pacific salmon (Oncorhynchus spp.) across 120 stocks. This multistock approach permitted more precise estimates of effects than standard single-stock analyses. The estimated effects were opposite in sign between northern and southern stocks and were quite consistent across stocks within species and areas. Warm anomalies in coastal temperatures were associated with increased survival rates for stocks in Alaska and decreased survival rates in Washington and British Columbia, suggesting that different mechanisms determine survival rates in the two areas. Regional-scale sea surface temperatures (SST, within several hundred kilometres of a stock's ocean entry point) were a much better predictor of survival rates than large-scale climate anomalies associated with the Pacific Decadal Oscillation (PDO), suggesting that survival rates are primarily linked to environmental conditions at regional spatial scales. With appropriate cautions, these results may be used to predict the potential effects of climatic changes on salmon productivity in different areas of the Northeast Pacific.

scholarly journals A hydrogeologic framework for characterizing summer streamflow sensitivity to climate warming in the Pacific Northwest, USA

2014 ◽  
Vol 18 (9) ◽  
pp. 3693-3710 ◽  
Author(s):  
M. Safeeq ◽  
G. E. Grant ◽  
S. L. Lewis ◽  
M. G. Kramer ◽  
B. Staab
Keyword(s):  
Pacific Northwest ◽  
General Circulation ◽  
Large Scale ◽  
Regional Scale ◽  
Climate Scenario ◽  
General Circulation Models ◽  
Hydrologic Models ◽  
Empirical Measures ◽  
The Pacific ◽  
Hydrogeologic Framework

Abstract. Summer streamflows in the Pacific Northwest are largely derived from melting snow and groundwater discharge. As the climate warms, diminishing snowpack and earlier snowmelt will cause reductions in summer streamflow. Most regional-scale assessments of climate change impacts on streamflow use downscaled temperature and precipitation projections from general circulation models (GCMs) coupled with large-scale hydrologic models. Here we develop and apply an analytical hydrogeologic framework for characterizing summer streamflow sensitivity to a change in the timing and magnitude of recharge in a spatially explicit fashion. In particular, we incorporate the role of deep groundwater, which large-scale hydrologic models generally fail to capture, into streamflow sensitivity assessments. We validate our analytical streamflow sensitivities against two empirical measures of sensitivity derived using historical observations of temperature, precipitation, and streamflow from 217 watersheds. In general, empirically and analytically derived streamflow sensitivity values correspond. Although the selected watersheds cover a range of hydrologic regimes (e.g., rain-dominated, mixture of rain and snow, and snow-dominated), sensitivity validation was primarily driven by the snow-dominated watersheds, which are subjected to a wider range of change in recharge timing and magnitude as a result of increased temperature. Overall, two patterns emerge from this analysis: first, areas with high streamflow sensitivity also have higher summer streamflows as compared to low-sensitivity areas. Second, the level of sensitivity and spatial extent of highly sensitive areas diminishes over time as the summer progresses. Results of this analysis point to a robust, practical, and scalable approach that can help assess risk at the landscape scale, complement the downscaling approach, be applied to any climate scenario of interest, and provide a framework to assist land and water managers in adapting to an uncertain and potentially challenging future.

Small mammals in northern Lithuania: species diversity and abundance

Ekologija ◽  
2010 ◽  
Vol 56 (3) ◽  
pp. 110-115 ◽  
Author(s):  
Paulius Alejūnas ◽  
Vitalijus Stirkė
Keyword(s):  
Species Diversity ◽  
Small Mammals

scholarly journals Classification of Recreation Opportunity Spectrum Using Night Lights for Evidence of Humans and POI Data for Social Setting

2021 ◽  
Vol 13 (14) ◽  
pp. 7782
Author(s):  
Wenjing Zeng ◽  
Yongde Zhong ◽  
Dali Li ◽  
Jinyang Deng
Keyword(s):  
Large Scale ◽  
Regional Scale ◽  
Hunan Province ◽  
Social Settings ◽  
Recreation Opportunity Spectrum ◽  
City District ◽  
Night Lights ◽  
Recreational Resources ◽  
Metropolitan Counties ◽  
Land Types

The recreation opportunity spectrum (ROS) has been widely recognized as an effective tool for the inventory and planning of outdoor recreational resources. However, its applications have been primarily focused on forest-dominated settings with few studies being conducted on all land types at a regional scale. The creation of a ROS is based on physical, social, and managerial settings, with the physical setting being measured by three criteria: remoteness, size, and evidence of humans. One challenge to extending the ROS to all land types on a large scale is the difficulty of quantifying the evidence of humans and social settings. Thus, this study, for the first time, developed an innovative approach that used night lights as a proxy for evidence of humans and points of interest (POI) for social settings to generate an automatic ROS for Hunan Province using Geographic Information System (GIS) spatial analysis. The whole province was classified as primitive (2.51%), semi-primitive non-motorized (21.33%), semi-primitive motorized (38.60%), semi-developed natural (30.99%), developed natural (5.61%), and highly developed (0.96%), which was further divided into three subclasses: large-natural (0.63%), small natural (0.27%), and facilities (0.06%). In order to implement the management and utilization of natural recreational resources in Hunan Province at the county (city, district) level, the province’s 122 counties (cities, districts) were categorized into five levels based on the ROS factor dominance calculated at the county and provincial levels. These five levels include key natural recreational counties (cities, districts), general natural recreational counties (cities, districts), rural counties (cities, districts), general metropolitan counties (cities, districts), and key metropolitan counties (cities, districts), with the corresponding numbers being 8, 21, 50, 24, and 19, respectively.

A Failed Experiment: Okinawan Indents and the Postwar Torres Strait Pearlshelling Industry, 1958–1963

2021 ◽  
Vol 99 ◽  
pp. 122-146
Author(s):  
Anna Shnukal
Keyword(s):  
Large Scale ◽  
Labor Policy ◽  
Social Characteristics ◽  
Labor Movements ◽  
Pacific War ◽  
Immigration Restriction ◽  
The Pacific ◽  
History Of ◽  
Significant Locus ◽  
Torres Strait

AbstractThroughout its European history, Australia has solved recurrent labor shortages by importing workers from overseas. Situated on shipping lanes between the Pacific and Indian Oceans, the northern Australian pearlshelling industry became a significant locus of second-wave transnational labor flows (1870–1940) and by the 1880s was dependent on indentured workers from the Pacific and Southeast Asia. Exempted from the racially discriminatory Immigration Restriction Act of 1901, indentured Asian seamen, principally Japanese, maintained the industry until the outbreak of the Pacific War in 1941. The Torres Strait pearlshelling industry, centered on Thursday Island in Far North Queensland, resumed in 1946 amid general agreement that the Japanese must not return. Nevertheless, in 1958, 162 Okinawan pearling indents arrived on Thursday Island in a controversial attempt to restore the industry's declining fortunes. This article is intended as a contribution to the history of transnational labor movements. It consults a range of sources to document this “Okinawan experiment,” the last large-scale importation of indentured Asian labor into Australia. It examines Australian Commonwealth-state tensions in formulating and adopting national labor policy; disputes among Queensland policy makers; the social characteristics of the Okinawan cohort; and local Indigenous reactions. Also discussed are the economics of labor in the final years of the Torres Strait pearling industry. This study thus extends our knowledge of transnational labor movements and the intersection of early postwar Australian-Asian relations with Queensland Indigenous labor policy. It also foreshadows contemporary Indigenous demands for control of local marine resources.

scholarly journals Diversity and Community Structure of Oribatid Mites (Acari, Oribatei) at Memorial Complexes of a Megapolis

2013 ◽  
Vol 47 (4) ◽  
pp. 291-297
Author(s):  
L. A. Kolodochka ◽  
O. S. Shevchenko
Keyword(s):  
Community Structure ◽  
Species Diversity ◽  
Species Complex ◽  
Common Species ◽  
Oribatid Mites ◽  
Direct Relation ◽  
City Center ◽  
Degree Of Dominance ◽  
Different Types ◽  
The City

Abstract In different types of substrate (soil, litter, lichens and mosses) collected at three memorial complexes (cemeteries) of Kyiv (Ukraine), 70 species from 57 genera, 34 families of oribatid mites were found. A few eurytopic species capable of tolerance to different types of pollution make up an essential part in each species complex. The species diversity and complexity of oribatid community structure at researched areas increased with distance from the city center. There was no direct relation between the degree of dominance of most common species and the cemetery’s relative remoteness from the center of the city.

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