Desert Life. Desert ecology Why are deserts dry? What adaptations to animals and plants need to live there?

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    11-Jan-2016

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<ul><li><p>Desert Life</p></li><li><p>Desert ecologyWhy are deserts dry?What adaptations to animals and plants need to live there?Desert ecology</p></li><li><p>DesertsDefinition of a desert: less than 10 inches of rain per year, more evaporation than precipitationThis is caused either by dry winds (air heating up as it gets warmer), a mountain rainshadow, or lack of water in the middle of a continentDesert ecology</p></li><li><p>Why are deserts dry?Rainshadow of mountain / middle of continentFalling air / cool air holds little moisture and at this latitude, air often falls from having risen at the equatorDesert ecology</p></li><li><p>DesertsDesert ecology</p></li><li><p>North American DesertsSonoran DesertMojave DesertChihuahuan DesertGreat Basin DesertDesert ecology</p></li><li><p>North American DesertsCharacteristic plants:Sonoran Desert: Saguaro, cactiMojave Desert: Joshua treeChihuahuan Desert: yuccasGreat Basin Desert: sagebushDesert ecology</p></li><li><p>Why does any organism live where it lives?Usually three kinds of explanations:Abiotic environment (the right climate, nesting sites, etc.)Biotic interactions (prey is there)History (it evolved there and did not migrate somewhere else)The abiotic environment</p></li><li><p>Why are most cacti only found in the American deserts?Abiotic environment (dry with periodic rain; not too cold)Biotic interactions (can defend themselves against desert herbivores and compete with other desert plants)History (evolved in the Americas, and cannot migrate to Africa, for example)The abiotic environment</p></li><li><p>North American DesertsCharacteristic plants because of characteristic climate:Sonoran Desert: winter and summer rains (monsoon), very hotMojave Desert: winter rains, hotChihuahuan Desert: summer rains, warmGreat Basin Desert: winter rains, high elevation, colder (especially in winter)Desert ecology</p></li><li><p>Desert adaptationsAnimals and plants that live in the desert are adapted to the hot, dry climate.Three basic methods: Evade Endure ExpireDesert ecology</p></li><li><p>Evade Endure ExpireMigrate away in summerOnly be active at nightDesert ecologyMinimize water lossMaximize heat lossStore waterAdults may die before it gets too hotDurable eggs or seeds survive to next wet season</p></li><li><p>Endure: ways to cope with hot &amp; dry climateStore waterConserve waterTolerate dehydrationReduce heat inputDissipate heatTolerate hypothermiaDesert ecology</p></li><li><p>Endure: ways to cope with hot &amp; dry climateStore waterConserve waterTolerate dehydrationReduce heat inputDissipate heatTolerate hypothermiaDesert ecology</p></li><li><p>Endure: ways to cope with hot &amp; dry climateStore waterConserve waterTolerate dehydrationReduce heat inputDissipate heatTolerate hypothermiaDesert ecology</p></li><li><p>Endure: ways to cope with hot &amp; dry climateStore waterConserve waterTolerate dehydrationReduce heat inputDissipate heatTolerate hypothermiaDesert ecologyvertical leaves, insulation with hairs</p></li><li><p>Endure: ways to cope with hot &amp; dry climateStore waterConserve waterTolerate dehydrationReduce heat inputDissipate heatTolerate hypothermiaDesert ecology</p></li><li><p>Endure: ways to cope with hot &amp; dry climateStore waterConserve waterTolerate dehydrationReduce heat inputDissipate heatTolerate hypothermiaDesert ecology</p></li><li><p>DesertsDeserts are drier than other placesBut there are different kinds of deserts depending on the temperature, seasons, and when &amp; how much rainAnimals and plants are adapted to a particular niche, which includes climate and other speciesWhere an animal/plant lives also has historic reasonsSummary</p></li></ul>

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