| 0:00:04 | what you see before you |
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| 0:00:08 | you see a barren wasteland |
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| 0:00:11 | or do you see a stark landscape of beauty |
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| 0:00:16 | what if i were to tell you this area was teeming with life |
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| 0:00:21 | what if i were to tell you what plethora of stunning plant and animal life |
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| 0:00:25 | lay hidden before you're very eyes |
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| 0:00:29 | this area is them a hobby national preserve and it is currently threatened by human |
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| 0:00:34 | driven pressure |
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| 0:00:35 | my name is keep geddes |
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| 0:00:37 | i'm a graduate students at in speech is a hobby here at the university of |
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| 0:00:40 | california los angels |
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| 0:00:43 | using a combination of ecological |
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| 0:00:45 | remote sensing and genetic tools |
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| 0:00:48 | i'm trying to help preserve them a hobby from ongoing threats to its survival |
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| 0:00:53 | in order to know how speech is respond to a changing environment we must first |
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| 0:00:57 | know more about the past history and current limits of speech is in this so |
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| 0:01:02 | to explain how i in my colleagues are doing this we should start the base |
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| 0:01:06 | and work our way up |
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| 0:01:09 | and the hobby does there is one of four major us deserts |
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| 0:01:13 | the hardest of the group much of them obvious commonly referred to as the high |
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| 0:01:16 | desert as large areas light elevations greater than three thousand meters |
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| 0:01:22 | the does it runs across three states occurring mostly within the california landscape |
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| 0:01:29 | the total area of the desert is twenty two thousand square miles |
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| 0:01:34 | is incredibly area receiving lesson thirteen inches of rain paul in italy |
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| 0:01:39 | temperatures read the desert are very extreme going from below freezing in the winter and |
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| 0:01:44 | resting well above one hundred twenty in the summer months |
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| 0:01:48 | over the last twenty years all the southwest is observed a decline in rainfall |
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| 0:01:54 | for the already irritable hobby this is disconcerting as multiple climate models predicted increasing the |
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| 0:02:00 | error future for this area |
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| 0:02:04 | additionally development in the desert is ever increasing |
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| 0:02:08 | most of the natural water sources are already diverted to major towns |
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| 0:02:13 | man's in fact has led to dramatic fragmentation in isolation of the once pristine area |
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| 0:02:21 | in the face of this |
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| 0:02:23 | with the assistance of collaborators at ucla in the national park service |
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| 0:02:28 | over the last five years i have been studying the impact of climate and landscape |
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| 0:02:33 | on the viability of representatives p c's within the model we doesn't |
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| 0:02:38 | our study species is cackle acacia |
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| 0:02:41 | a common software shrugged but has apache distribution normally restricted to dry washes |
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| 0:02:46 | where previous rainfall has led to cindy stream back behind |
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| 0:02:50 | the major characteristics of the species are representative of numerous other shrubs species in this |
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| 0:02:55 | area |
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| 0:02:56 | thus |
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| 0:02:57 | understanding how it is affected in forms is about the response of the community as |
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| 0:03:01 | a whole |
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| 0:03:03 | what is now essential is an understanding of the current limitations of species to react |
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| 0:03:08 | to these dramatic changes |
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| 0:03:10 | with such rapid a measure occurring survival depends on maintaining existing populations |
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| 0:03:15 | and the ability to move when habitat becomes altered were damaged |
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| 0:03:19 | for plans this isn't as easy as speaking at your legs and moving |
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| 0:03:24 | plants movie a seed and pond dispersal |
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| 0:03:27 | thus observing their normal rates of movement is a bit tricky |
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| 0:03:31 | having access to genetic tools helps to solve this problem |
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| 0:03:35 | we can measure genetic differences between plants to estimate the degree to which their ancestors |
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| 0:03:40 | have moved |
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| 0:03:41 | and how landscape refinement have affected this movement or limited their reproduction |
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| 0:03:48 | we do this by taking our data in displaying it on maps |
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| 0:03:53 | looking at areas where we know are species as |
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| 0:03:57 | we can plot out the dominant avenues of dispersal |
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| 0:04:01 | by comparing those areas with lots of movement with those areas with very little |
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| 0:04:07 | we can identify the dominant landscape features that facilitate or np dispersal |
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| 0:04:14 | what we have found for cat clocky shows striking |
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| 0:04:18 | this tree has a history of widespread movement |
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| 0:04:21 | much of this has been dramatically affected by the surrounding climate |
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| 0:04:26 | we find that movement through the harder areas is very limited |
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| 0:04:30 | and at lower harder elevation acacia produces fewer scenes and thus moves less |
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| 0:04:38 | this is troubling given the future of this area |
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| 0:04:41 | if temperature in a ready to continue to rise cat claw and other species like |
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| 0:04:45 | it or that depend on it will have an increasingly restricted range |
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| 0:04:51 | as we have observed the history of widespread movement for this p c's this will |
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| 0:04:55 | mean a dramatic shift |
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| 0:04:57 | we continue to study this p c's to provide land managers with the best option |
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| 0:05:02 | for curbing the effects of human driven environmental change |
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| 0:05:07 | only through a joint effort of community action and scientific enquiry can we hope to |
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| 0:05:13 | reserve the majestic beauty of areas like them harvey from our own actions |
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