My swanky padlet by Julia Baxter https://padlet.com/julia9baxter/3uhswesb5k7f0igm en-us 2023-08-30 04:24:22 UTC 2023-09-12 05:45:16 UTC hello@padlet.com acam2738 https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677704302 Why is the world green not brown

]]> 2023-08-30 04:31:29 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677704302 Top down vs Bottom up vs Side to side? julia9baxter https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677704646 2023-08-30 04:31:51 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677704646 acam2738 https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677704710 Top down vs bottom up vs sideways vs environmental ]]> 2023-08-30 04:31:54 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677704710 top down- excluding sheep from grazing areas changed species composition (Hill et al 1992) julia9baxter https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677705758 2023-08-30 04:33:00 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677705758 bottom up- plants produce toxic chemicals that dissuade herbivory julia9baxter https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677706391 Short term: reduce palatability, encourage herb to move away from the plant and stop eating it
Long term: poison makes plant unable to support high density population as herb can't eat too much of the plant to gain enough energy for efficient reproduction]]> 2023-08-30 04:33:39 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677706391 piperjrobin https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677706727 Hairston 1960 supports predator top-down control.]]> 2023-08-30 04:34:00 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677706727 piperjrobin https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677710606 Sounds like a simple question that should have a clear answer, but in reality is very complex.]]> 2023-08-30 04:38:02 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677710606 Population dynamics julia9baxter https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677712538 - Environmental constraints (often climatic) prevent herbs from getting to high enough densities to exploit all greenery
- competition: inter vs intra specific comp keeps herbs in check]]> 2023-08-30 04:40:02 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677712538 piperjrobin https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677713907 Plants historically viewed as passive, now understood to have active defensive mechanisms.]]> 2023-08-30 04:41:37 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677713907 Microbes julia9baxter https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677714261 evidence for both protecting plants (alkaloid producing fungi that protect grass) and facilitating herbivory (gut microbes to digest cellulose)]]> 2023-08-30 04:41:59 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677714261 Top down control doesn't make the world green/brown acam2738 https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677715227 It only changes the distribution/type of vegetation]]> 2023-08-30 04:42:59 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677715227 acam2738 https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677716118 In an environment where things consume one another, why don't they eat the thing they consume until there is none left - how do species coexist to form this balance]]> 2023-08-30 04:43:50 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677716118 hollyr11702 https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677716183 (Richards and Coley 2007) review how there is a dual role of bottom-up and top-down in tropical forests in panama ]]> 2023-08-30 04:43:53 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677716183 tbra9419_2 https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677716262 Any population which is not resource-limited must, of course, be limited to a level below that set by its resources ]]> 2023-08-30 04:43:59 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677716262 A green world doesn't mean an edible one (Power 1992) julia9baxter https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677716634 - herbivory resistant plants e.g. thorny
- foods for herbs present but not being eaten (sheep experiment, Hill et al 1992)

]]> 2023-08-30 04:44:21 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677716634 Top down idea tbra9419_2 https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677717524 Herbivores are seldom food-limited, appear most often to be predator-limited, and therefore are not likely to compete for common resources ]]> 2023-08-30 04:45:02 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677717524 Original Green World Hypothesis 1960 piperjrobin https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677718897 The world is green because higher trophic levels (predators) control herbivore abundance.]]> 2023-08-30 04:46:14 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677718897 An argument against top-down tbra9419_2 https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677719039 most predators would be unable to make any significant impact on the numbers of a prey which is very rare for most of the time, but suddenly becomes very abundant for a few weeks in one season ]]> 2023-08-30 04:46:24 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677719039 Sideways acam2738 https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677719089 Fire as a herbivore - follows the rules of herbivory]]> 2023-08-30 04:46:28 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677719089 inter-related feedback loops make it hard to choose top down or bottom up julia9baxter https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677720117 2023-08-30 04:47:32 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677720117 System dependent acam2738 https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677721278 Something that may apply within one system may not be the same in another - some may be more controlled by top down/bottom up/other processes than other seemingly similar systems]]> 2023-08-30 04:48:40 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677721278 piperjrobin https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677722349 Microbes can act from a top-down (helping herbivores digest plant matter in the gut) or bottom-up (fungi symbiotic relationship with plants to produce defensive toxins) perspective.]]> 2023-08-30 04:49:48 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677722349 bottom up- spatial processes affect accessibility to plants julia9baxter https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677726434 plants can hide either
- visually
- olfactory
- with a wide distribution
This reduces the efficiency of finding food = energy loss = energy not adequate to meant survival demands = high density pop can't be maintained

]]> 2023-08-30 04:53:05 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677726434 bottom up- low nutritional quality julia9baxter https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677731454 nutrients (Lawton and McNeill 1979) e.g. nitrogen or hard to digest structures e.g. nitrogen]]> 2023-08-30 04:56:24 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677731454 piperjrobin https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677734740 Referee for Karhu and Neuvonen (1997) wrote a critical review of the research, showing its contentious even within like-minded research groups.]]> 2023-08-30 04:59:17 UTC https://padlet.com/julia9baxter/3uhswesb5k7f0igm/wish/2677734740