Biology of a tropical intertidal population ofCerithium atratum(Born, 1778) (Mollusca, Gastropoda)

2004 ◽  
Vol 38 (13) ◽  
pp. 1695-1710 ◽  
Author(s):  
M. R. Denadai ◽  
A. C. Z. Amaral ◽  
A. Turra
Keyword(s):  
Intertidal Population

EFFECTS OF THE IXTOC I OIL SPILL ON THE INTERTIDAL AND SUBTIDAL INFAUNAL POPULATIONS ALONG LOWER TEXAS COAST BARRIER ISLAND BEACHES

1981 ◽  
Vol 1981 (1) ◽  
pp. 467-475 ◽  
Author(s):  
Larry C. Thebeau ◽  
John W. Tunnell ◽  
Quenton R. Dokken ◽  
Mary E. Kindinger
Keyword(s):  
Oil Spill ◽  
Sandy Beaches ◽  
Beach Erosion ◽  
Seasonal Fluctuations ◽  
Population Densities ◽  
Texas Coast ◽  
Tropical Depression ◽  
Intertidal Population ◽  
Abundance And Diversity ◽  
The Impact

ABSTRACT Pre-spill (August 4 to 11, 1979) and post-spill (September 24 to 29, 1979) sampling of intertidal and subtidal infaunal populations along lower Texas coast sandy beaches was conducted to determine the impact of the Ixtoc I oil spill. Transects sampled between the Rio Grande and Port Aransas produced 52 species of macroinfauna primarily dominated in abundance and diversity by polychaetes and haustoriid amphipods. Analyses revealed visible, though not significant, decreases in pooled intertidal population densities and significant reductions in pooled subtidal population densities. Numbers of species did not significantly change. Population density changes may have been caused by Ixtoc I impact, tropical depression/storm beach erosion, seasonal fluctuations, beach cleanup techniques, or a combination of these.

Changes in endogenous hormones and seed-coat phenolics during seed storage of two Suaeda salsa populations

2016 ◽  
Vol 64 (4) ◽  
pp. 325 ◽  
Author(s):  
Yan-ge Xu ◽  
Ranran Liu ◽  
Na Sui ◽  
Weiwei Shi ◽  
Lei Wang ◽  
...  
Keyword(s):  
Seed Coat ◽  
Seed Storage ◽  
Suaeda Salsa ◽  
Endogenous Hormones ◽  
Seed Vigour ◽  
Opposite Trend ◽  
Population Concentration ◽  
Intertidal Population ◽  
Black Seeds ◽  
And Storage

Changes in endogenous hormones and seed-coat phenolics during the storage of the dimorphic seeds of two Suaeda salsa populations were investigated. The results showed that, regardless of salinity, storage did not reduce the germination of brown or black seeds from an inland population, but it significantly decreased the germination of dimorphic seeds from an intertidal population. Abscisic acid (ABA) concentration was significantly higher in old seeds than in fresh seeds (freshly harvested dry seeds), whereas the opposite trend was evident for gibberellic acid (GA, including GA1 and GA3) concentration and GA : ABA ratio in both populations, and especially in the intertidal population. Concentration of seed-coat phenolics extracted from brown seeds was much higher than in black seeds in both populations, regardless of extracting time and storage. Storage increased the concentration of phenolics extracted from brown seeds in the inland population, whereas the opposite trend was evident in the intertidal population. Storage did not significantly change seed-coat phenolics extracted from black seeds relative to brown seeds in either population. The results indicated that changes in seed vigour during storage in dimorphic seeds of the two S. salsa populations are related to changes in endogenous hormones and seed-coat phenolics.

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