Southern California Abalones: Can Stocks Be Rebuilt Using Marine Harvest Refugia?

1993 ◽  
Vol 50 (9) ◽  
pp. 2010-2018 ◽  
Author(s):  
Mia J. Tegner
Keyword(s):  
Drift Tube ◽  
Southern California ◽  
Kelp Forest ◽  
Forest Community ◽  
Brood Stock ◽  
Natural Recovery ◽  
Juvenile Abundance ◽  
History Of ◽  
Haliotis Corrugata ◽  
Severe Disturbance

Recovery of the isolated Palos Verdes Peninsula (PVP) kelp forest community after severe disturbance offers important implications for the design of marine harvest refugia. In 1977, part of the Southern California mainland coast was closed to abalone fishing to promote natural recovery. Pink (Haliotis corrugata) and green (Haliotis fulgens) abalones, historically the more abundant haliotids at PVP, did not respond. Nearby islands had substantial stocks, but the short planktonic period of green abalone larvae suggested that dispersal between isolated beds was uncommon. A drift tube study supported this hypothesis and stressed the importance of local brood stock. An experimental transplant of green abalone brood stock into sites where the drift tube data suggested high probability of larval retention led to a dramatic increase in juvenile abundance, a pattern not seen at distant controls. Other taxa with different distributions and larval periods further support the importance of dispersal potential to the natural recovery of depleted stocks. Thus, refugia design must consider the life history of target species, the oceanographic regime and distances from source areas, as well as the feasibility of enforcement.

Improving the ability of a BACI design to detect impacts within a kelp‐forest community

2021 ◽  
Author(s):  
Andrew Rassweiler ◽  
Daniel K. Okamoto ◽  
Daniel C. Reed ◽  
David J. Kushner ◽  
Donna M. Schroeder ◽  
...  
Keyword(s):  
Kelp Forest ◽  
Forest Community ◽  
Baci Design

The Los Angeles earthquakes of July, 1920

1921 ◽  
Vol 11 (1) ◽  
pp. 63-79
Author(s):  
Stephen Taber
Keyword(s):  
Los Angeles ◽  
Southern California ◽  
History Of ◽  
Set Up ◽  
The City ◽  
Tectonic Movements

Summary More than a hundred earthquakes have been recorded in southern California during the period February-September, 1920. These earthquakes have originated along several different faults in the vicinity of Los Angeles, but all of them are believed to have resulted from the adjustment of stresses set up in the region by the same general tectonic movements. The series of shocks felt in Los Angeles on July 16th originated along faults which cut Miocene and Pliocene rocks in the northern part of the city. The three strongest shocks on July 16th had epicentral intensities of between VI and VII in the Rossi-Forel scale; and they were felt over areas of from 500 to 2500 square miles. The known seismic history of southern California and the magnitude of the post-Pleistocene movements both indicate that the seismicity of the region is relatively high. There are many faults in the vicinity of Los Angeles; some of which are known to be active, while others are suspected of being active. Fortunately those within the city are short, while the longer ones are seven to thirty miles away, and are therefore less dangerous in so far as Los Angeles is concerned.

Panorams, Motels, and Pirates

2016 ◽  
Author(s):  
Peter Alilunas
Keyword(s):  
United States ◽  
Southern California ◽  
The United States ◽  
Early History ◽  
Video Distribution ◽  
Video Rental ◽  
History Of

Chapter one examines the early history of adult video from a variety of technological, cultural, and industrial perspectives beginning with the Panoram, a device invented in the 1940s and completely unintended for pornography. Following is an analysis of the adult motel landscape of Southern California, an early site of adult video distribution. The chapter concludes with a history of the early pioneers of adult video, including George Atkinson, who created the first video rental store in the United States.

A Clearer Picture of this Country

Heading Out ◽  
2017 ◽  
Author(s):  
Terence Young
Keyword(s):  
Southern California ◽  
State Department ◽  
The Real ◽  
History Of ◽  
The Many ◽  
The U.S

This chapter analyzes the development and use of camping trailers, particularly the history of Airstream trailers and the company's colourful founder, Wally Byam. Byam initially came to Southern California in the 1920s to make his fortune in Hollywood, but he found success only after he began to sell trailer plans and trailers themselves during the early 1930s. After Byam passed away in 1962, the Wally Byam Foundation worked with the Airstream Company and the U.S. State Department to create several programs that used trailer camping as a means to familiarize foreign diplomats and others with the “real America.” Moreover, the experiences of Carolyn Bennett Patterson and the many participants in the trailer camping adventures organized by the Wally Byam Foundation suggest that trailer camping fits within the arc of camping's development.

Early Life History of Fishes in the San Francisco Estuary and Watershed

2004 ◽  
Keyword(s):  
Growth Rate ◽  
San Francisco ◽  
Striped Bass ◽  
Growth Rates ◽  
Early Life History ◽  
San Francisco Estuary ◽  
Annual Growth ◽  
Factors Affecting ◽  
Juvenile Abundance ◽  
History Of

<em>Abstract.</em>—We investigated factors affecting growth of larval striped bass <em>Morone saxatilis </em>in the San Francisco Estuary from 1984 to 1993. We estimated ages and growth rates of larval striped bass from daily otolith increments. Mean annual growth rates of 6–14 mm standard length striped bass varied from 0.13 to 0.27mm/d, the lowest rate occurring in 1989 and the highest in 1992. The 1989 growth rate was significantly lower than all other years, and growth rates for 1992 and 1993 were significantly higher than all other years, but did not differ from one another. Differences in annual growth rates apparently were due mainly to differences in mean annual prey densities because growth rate increased as prey density increased. Compared to both laboratory measured growth rates and growth rates of field-caught Chesapeake Bay larvae, growth rates from the San Francisco Estuary appeared to be high for the food available, indicating that larvae can grow at relatively high rates even at low prey densities. Correlation analyses did not support density-dependent control of growth rates. Growth rate was not significantly related to mean annual conductivity, water temperature, mortality rates, or the juvenile abundance index, but was significantly and positively correlated with densities of 1-mm length-groups of 9–14-mm striped bass.

Making Parallel Histories out of Spanish Missions

2020 ◽  
pp. 81-106
Author(s):  
Katherine D. Moran
Keyword(s):  
Native Americans ◽  
World War I ◽  
Southern California ◽  
Territorial Expansion ◽  
Founding Fathers ◽  
Spanish Missions ◽  
The Status ◽  
History Of ◽  
History Of Violence ◽  
Junipero Serra

This chapter explores the mission celebrations that developed in Southern California, among newly arrived Anglo settlers and tourists, and between the 1880s and World War I. It talks about mission writers who celebrated the Spanish Franciscans that were led by Junípero Serra and founded missions in the late eighteenth and early nineteenth centuries. It also argues that the celebrations in the Midwest elevated Catholic missionaries to the status of regional and national founding fathers in ways that naturalized U.S. territorial expansion. The chapter mentions the Serra celebrations that contended with the recent history of violence in Southern California. It describes the war with Mexico and ongoing violence against Mexicans, as well as the murder and displacement of Native Americans.

Sign in / Sign up

Export Citation Format

Share Document