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Blue Crab - Yara Alsulaim, Barrel Cactus - Yara Alsulaim - Coggle Diagram
Blue Crab - Yara Alsulaim
Soil hardness
Crabs prefer habitats with softer and wetter edaphic conditions.
Salinity
"When salt concentrations increase in estuaries, crab populations fall."
Temperature
When the water temperature starts to fall and the days start getting shorter, the blue crab retreats to deep water and burrows into the muddy or sandy bottom to spend the winter.
Humans
Hypoxia, habitat destruction, shoreline development, and chemical toxicants are all thought to be major issues impacting blue crabs and their habitat in Chesapeake Bay.
Predatiors
Crabs are eaten by large fish, some fish-eating birds (like great blue herons), and sea turtles.
Competitors
the European green crab, the Japanese shore crab, and the Chinese mitten crab are highly effective competitors against blue crabs for prey resources and refuge habitat.
Barrel Cactus - Yara Alsulaim
Solar Radiation
When barrel cactus is exposed to more than six hours of direct sunlight every day, it will develop sunburn.
Soil
Glaucous barrel cactus grows best in fertile, gravel-rich, water-permeable soil with a pH value of 6-7.
Temperature
The optimum temperature for growth is 20 - 35 ℃. Lower than 10 ℃ or higher than 35 ℃, growth slows and dormancy begins.
Humidity
The air humidity should not be too high and the environment should be well-ventilated.
Humans
The Barrel Cactus contains toxic sap that is found in the plant's ribs and can cause skin irritation
Predators
Many animals eat the barrel cactus or its fruit, including desert bighorn sheep and antelope ground squirrels.