Comparison of the community composition of aquatic insects between wetlands with and without the presence of Procambarus clarkii: a case study from Japanese wetlands

2022 ◽  
Author(s):  
Reiya Watanabe ◽  
Shin–ya Ohba
Keyword(s):  
Community Composition ◽  
Aquatic Insects ◽  
Procambarus Clarkii

Environmental control of emergence patterns: Case study of changes in hourly and daily emergence of aquatic insects at constant and variable water temperatures

2013 ◽  
Vol 98 (2) ◽  
pp. 104-115 ◽  
Author(s):  
Marija Ivković ◽  
Marko Miliša ◽  
Ana Previšić ◽  
Aleksandar Popijač ◽  
Zlatko Mihaljević
Keyword(s):  
Aquatic Insects ◽  
Environmental Control ◽  
Emergence Patterns ◽  
Variable Water

scholarly journals Intrabasin Floral Differences in the Sonoran Desert; a case study from the Casa Grande Valley

2014 ◽  
Author(s):  
Gabriela Garcia ◽  
Sarah Gabriele ◽  
Benjamin Cowgill ◽  
Xavier Rodriguez ◽  
Robert J Gay
Keyword(s):  
Community Composition ◽  
Soil Ph ◽  
Sonoran Desert ◽  
Mineral Content ◽  
Controlling Factors ◽  
Floral Variation ◽  
Significant Difference ◽  
Elevation Data ◽  
Expected Values

Background: The purpose of this study was to determine what floral differences exist in North Mountain Park and Casa Grande Mountain Park which are both located on opposite sides of the Casa Grande Valley, Pinal County, Arizona and to attempt to explain any measured differences. Previous authors have proposed several explanations for floral variation within the Sonoran Desert including elevation, soil pH, and mineral content. This study explicitly tests several of these proposed mechanisms for determining community composition. Methods: The floral composition was measured in both North Mountain Park and Casa Grande Mountain Park through a series of transects which were sampled by multiple times in 2012 and 2013. Elevation data soil pH were also sampled. Results: The data recovered from North Mountain Park differed from the expected values in Casa Grande Mountain Park by 22%. This indicates a significant difference in the flora between these two localities that was not predicted by earlier studies. Elevation and soil pH differences between sampled localities were not significant. This suggests that mineral composition of the soil may play an important role within this basin in determining community composition. Discussion: Many factors that have been proposed in prior studies do not appear to play a significant role within the Casa Grande Valley in determining community composition. This indicates that the composition of a community is influenced by different factors in different locations within the Sonoran Desert. This makes determining overall controlling factors across an ecosystem difficult.

scholarly journals Autolysis in Crustacean Tissues after Death: A Case Study Using the Procambarus clarkii Hepatopancreas

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Xiaoli Huang ◽  
Guanqing Xiong ◽  
Xia Chen ◽  
Ruisi Liu ◽  
Minghao Li ◽  
...  
Keyword(s):  
Procambarus Clarkii ◽  
Apoptotic Cell ◽  
Reference Standards ◽  
Initiation Time ◽  
Tissue Samples ◽  
Tubular Cells ◽  
Cell Counts ◽  
Tissue Changes ◽  
Mesenchyme Cells

Autolysis is an internal phenomenon following the death of an organism that leads to the degradation of tissues. In order to explore the initial stages of autolysis and attempt to establish reference standards for tissue changes after death, we studied the rapidly autolyzing tissue of the crayfish hepatopancreas. Samples from the hepatopancreas of crayfish were examined 0, 5, 10, 30, 60, and 120 minutes after death. Histological and ultrapathological examinations and evaluations and apoptotic cell counts were conducted to determine the initiation time and degree of autolysis. The results showed that autolysis in the hepatopancreas of crayfish began within 5 minutes. Initially, autolysis manifested in the swelling of hepatic tubular cells and the widening of mesenchyme. Cells undergoing autolysis showed severe organelle necrolysis. Based on these observations, tissue samples should be collected and preserved within five minutes to avoid interfering with histopathological diagnoses.

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