Abundance of Young Brown Shrimp in Natural and Semi-Impounded Marsh Nursery Areas: Relation to Temperature and Salinity

Samples of brown shrimp (Penaeus aztecus, 10 to 130 mm in total length) were collected with otter trawls weekly from 14 March to 20 August 1971 in brackish marsh areas at Marsh Island, Louisiana. Catches were largest from 1 May to 4 June in the natural marsh and from 1 May to 4 July in the semi-impounded marsh (influenced by weirs). Total catch was four times greater in the natural than in the semi-impounded marsh. However, brown shrimp apparently stayed longer in the semi-impounded areas, and emigrated at a larger size. Water temperatures above 20°C were apparently more conducive to the growth of young brown shrimp than was a particular salinity range. The range of recorded salinities was 0.57-12.85 ‰; catch per sample was highest in salinities from 2.0 to 2.99 ‰

Abundance of Young Brown Shrimp in Natural and Semi-Impounded Marsh Nursery Areas: Relation to Temperature and Salinity

Samples of brown shrimp (Penaeus aztecus, 10 to 130 mm in total length) were collected with otter trawls weekly from 14 March to 20 August 1971 in brackish marsh areas at Marsh Island, Louisiana. Catches were largest from 1 May to 4 June in the natural marsh and from 1 May to 4 July in the semi-impounded marsh (influenced by weirs). Total catch was four times greater in the natural than in the semi-impounded marsh. However, brown shrimp apparently stayed longer in the semi-impounded areas, and emigrated at a larger size. Water temperatures above 20°C were apparently more conducive to the growth of young brown shrimp than was a particular salinity range. The range of recorded salinities was 0.57-12.85 ‰; catch per sample was highest in salinities from 2.0 to 2.99 ‰

2007 THE DECISION TO MOVE: AN ANALYSIS OF FACTORS THAT INFLUENCE AFRICAN AMERICANS IN THE GHETTO

The decision to move among African Americans in a poor community encompasses individual, household, and neighborhood characteristics. Previous research focuses on the frequently studied middle class. Meanwhile substantive analyses on African Americans from poor communities remain largely understudied. The current study uses data from a low income African American community to study residential mobility decisions. A systematic, random sample of respondents completed a survey concerning their residential situation. Data were triangulated to add reliability and richness to the findings. The results show that the decision to move is not a function of residential satisfaction, but is influenced by neighborhood and sociodemographic factors. It is suggested that future research focuses on policy intended to increase homeownership and informal social control. Future research should also concentrate on the health consequences associated with movement behavior. ii TABLE OF CONTENTS Pag