Posted on 25 October 2012. Tags: backreef, crepuscular, dawn and dusk, dive, Environments, forage, forereef, grey reef, niche, pelagic zone, Reef, reef sharks, social behaviors
Grey reef sharks are crepuscular so they are most active at dawn and dusk. They specialize in foraging at depths below 20 meters in both forereef and backreef environments. Grey reef sharks will leave the reef at night to forage in the pelagic zone and dive to grater depths. For the most part resting, foraging and any possible social behaviors all occur in close to the reef.
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Posted on 15 September 2012. Tags: Coexist, flying insects, food supply, forage, fruit, grubs, idea, jack sprat, mainstream consumers, niche markets, Niches, nuts, plate, worms
Jack Sprat could eat no fat
his wife could eat no lean,
and so, you see, between them both
They licked the platter clean.
Jack and his wife had different preferences for the food they ate, so never took food from each other’s plate.
Similarly, some birds eat nuts, others fruit, others flying insects, and others worms and grubs.
So they can happily forage and feed together without having to chase each other away from the food supply.
Similar ideas work in economics where some companies specialise in niche markets, and leave others to make products for the mainstream consumers.
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Posted on 10 December 2010. Tags: anole, anole lizards, Biaches, coloration, competitive exclusion, cryptic camouflage, fecundity, forage, lizards, nothing, organism, Plz, speed, sum total, tree trunks
There are several different species of anole lizards in the Caribbean. All of them like to eat insects. How do these species reduce competition?
Nothing — it is impossible to reduce competition between species that need the same resources.
One species has developed a bigger brain and faster speed, and it is outcompeting all the other species, which are going extinct.
Some search for bugs at the top of the trees, some hunt on tree trunks, and some forage on the ground.
Question 24 1 points Save
The sum total of all of the ways that an organism uses the resources of its environment is called the species _____.
fecundity
niche
habitat
cohort
Question 25 1 points Save
When two species have made long-term adjustments to adapt to characteristics that affect each other, this is called _____.
r-selection
co-evolution
a density-independent effect
competitive exclusion
An animal with cryptic (camouflage) coloration is trying to _____.
hide from predators
warn predators that the organism is poisonous
attract a mate
develop a commensalistic relationship with another species
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