scholarly journals Seasonal and directional dispersal behavior in an ongoing dove invasion

2019 ◽  
Author(s):  
David L. Slager
Keyword(s):  
Citizen Science ◽  
Carrying Capacity ◽  
Pacific Coast ◽  
Evolution Of Dispersal ◽  
Evolutionary Mechanisms ◽  
The North ◽  
Spatial Sorting ◽  
Dispersal Behavior ◽  
Land Bird ◽  
Natural Barrier

AbstractThe dispersal behavior that underlies range expansions can be difficult to study. Eurasian Collared-Doves have staged independent northwestward invasions across both Europe and North America, reaching carrying capacity in Europe but continuing to increase exponentially in the Americas, where their dispersal behavior remains enigmatic. I used citizen science observations to investigate Eurasian Collared-Dove dispersal behavior along the North American Pacific coast, a natural barrier to land-bird dispersal. Using coastal and pelagic observations, I assessed the seasonality and directionality of dispersal and its prevalence across years. Dispersal flights peaked in spring, like in Europe, and were north-biased, consistent with northwestward initial colonization. A non-significant trend of increasing dispersal across years may reflect evolution of dispersal via spatial sorting and selection. These results inform management of this invasive dove, raise new questions about evolutionary mechanisms behind the invasion, and exemplify using citizen science to study dispersal behavior, a longstanding challenge in ecology.

War stimulus: The Japanese threat and rebirth of the North America Pacific Coast shipbuilding industry, 1937-1946

2021 ◽  
Vol 33 (2) ◽  
pp. 382-411
Author(s):  
Chris Madsen
Keyword(s):  
United States ◽  
Supply Chain ◽  
Pacific Coast ◽  
The United States ◽  
Pearl Harbor ◽  
Shipbuilding Industry ◽  
The North ◽  
The Pacific ◽  
Before And After ◽  
Strategic Procurement

Henry Eccles, in classic studies on logistics, describes the dynamics of strategic procurement in the supply chain stretching from home countries to military theatres of operations. Naval authorities and industrialists concerned with Japanese aggression before and after Pearl Harbor looked towards developing shipbuilding capacity on North America’s Pacific Coast. The region turned into a volume producer of merchant vessels, warships and auxiliaries destined for service in the Pacific and Indian Oceans. Shipbuilding involved four broad categories of companies in the United States and Canada that enabled the tremendous production effort.

scholarly journals NUEVOS HALLAZGOS Y DISTRIBUCIÓN DE ALGUNAS ESPECIES DE AGUAS PROFUNDAS DEL PACÍFICO DE COLOMBIA II. CALLIONYMIDAE (TELEOSTEI)

2016 ◽  
Vol 45 (1) ◽  
Author(s):  
Beatriz Susana Beltrán León ◽  
Raúl Ríos Herrera ◽  
Efraín Rubio Rincón
Keyword(s):  
Deep Sea ◽  
Pacific Coast ◽  
New Records ◽  
Distribution Range ◽  
Adult Fish ◽  
The South ◽  
Fishing Fleet ◽  
The North ◽  
The Family ◽  
Colombian Pacific

We present new records of larvae and adult fish from the family Callionymidae in the Colombian Pacific coast. Larvae and juvenile of Synchiropus atrilabiatus (Garman 1899), expands its distribution range within this coast (between Tumaco in the South to the border with Panama in the North), presenting low to medium abundances in September-October 2002, 2003, 2004, 2005 and February-March 2006, 2014. Larvae were always collected at stations 54 km away from the coast. Adults of S. atrilabiatus were collected as bycatch from the deep-sea shrimp fishing fleet between 67-700 m depth at Bahía Cupica in 1995 and Arusí in 2005.

Notes on Birds Observed at Sea off the North Pacific Coast

The Murrelet ◽  
1933 ◽  
Vol 14 (1) ◽  
pp. 7
Author(s):  
J. E. Guberlet ◽  
R. C. Miller
Keyword(s):  
North Pacific ◽  
Pacific Coast ◽  
The North ◽  
The North Pacific

Simulating Succession of Riparian Spruce Forests and White-Tailed Deer Carrying Capacity in Northwestern Montana

1987 ◽  
Vol 2 (3) ◽  
pp. 80-83 ◽  
Author(s):  
Kurt J. Jenkins ◽  
R. Gerald Wright
Keyword(s):  
Carrying Capacity ◽  
River Flow ◽  
Populus Trichocarpa ◽  
Timber Harvesting ◽  
Resource Monitoring ◽  
Black Cottonwood ◽  
Winter Range ◽  
Erosion Rates ◽  
The North ◽  
North Fork

Abstract Rates of succession were determined during the period 1945-80 in six floodplain plant communities along the North Fork of the Flathead River, Montana. A succession model was developed to forecast the long-range effects of land-use change on the carrying capacity of white-tailed deer winter range. The areas occupied by mature spruce (Picea englemannii x glauca hybrid) and spruce-black cottonwood (Populus trichocarpa) forests on the floodplain were relatively constant between 1945-1980. Early seral types were more variable due to short-term variations in river flow. Successional modelling demonstrated the effects of two timber harvesting strategies on white-tailed deer populations. Simulated populations declined following two timber harvesting schedules, but recovered after cessation of harvest. An additional application of the model showed the potential effects of increased erosion rates on deer populations and demonstrated the versatility of land succession models for resource monitoring. West. J. Appl. For. 2(3):80-83, July 1987

scholarly journals Annual reversible plasticity of feeding structures: cyclical changes of jaw allometry in a sea urchin

2014 ◽  
Vol 281 (1779) ◽  
pp. 20132284 ◽  
Author(s):  
Thomas A. Ebert ◽  
José Carlos Hernández ◽  
Sabrina Clemente
Keyword(s):  
Sea Urchin ◽  
Pacific Coast ◽  
Morphological Changes ◽  
Linear Trend ◽  
Strongylocentrotus Purpuratus ◽  
Environmental Stressors ◽  
Feeding Apparatus ◽  
The North ◽  
Plastic Responses ◽  
Multiple Episodes

A wide variety of organisms show morphologically plastic responses to environmental stressors but in general these changes are not reversible. Though less common, reversible morphological structures are shown by a range of species in response to changes in predators, competitors or food. Theoretical analysis indicates that reversible plasticity increases fitness if organisms are long-lived relative to the frequency of changes in the stressor and morphological changes are rapid. Many sea urchin species show differences in the sizes of jaws (demi-pyramids) of the feeding apparatus, Aristotle's lantern, relative to overall body size, and these differences have been correlated with available food. The question addressed here is whether reversible changes of relative jaw size occur in the field as available food changes with season. Monthly samples of the North American Pacific coast sea urchin Strongylocentrotus purpuratus were collected from Gregory Point on the Oregon (USA) coast and showed an annual cycle of relative jaw size together with a linear trend from 2007 to 2009. Strongylocentrotus purpuratus is a long-lived species and under field conditions individuals experience multiple episodes of changes in food resources both seasonally and from year to year. Their rapid and reversible jaw plasticity fits well with theoretical expectations.

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