[ERA Webinar]: Invasive Plants Part II: Why Do Invasions Happen in the First Place? скачать в хорошем качестве

[ERA Webinar]: Invasive Plants Part II: Why Do Invasions Happen in the First Place?

In the second panel discussion in the series, our panelists step back and look at the bigger picture, and explore potential root causes and conditions that may be enabling “invasions” by species in the first place. Are there prior causes that we should understand before jumping to solve the invasives problem? Is it as simple as labelling a species as “aggressive” or “problematic”? Could it be that the threat of invasives is actually being driven by other human induced threats to ecosystems? This discussion is more of a collective inquiry into the issue of invasive plants in the larger context of what is happening in the world today. It’s meant to nurture and create space for inquiry. Viewers are encouraged to approach the discussion with an open mind. 00:00:01 – Suprabha sets the context 00:04:48 – Introducting Dr Rohan Shetti 00:05:23 – Invasives, Invasion and Restoration 00:10:56 – How one species came to dominate a forest in Europe 00:11:39 – When soil changes, what's on top also changes 00:14:30 – How human factors can compound invasion 00:18:11 – Addressing soil conditions as a prerequisite to restoration 00:22:12 – Introducing Dr Mahesh Sankaran 00:22:42 – Forest grassland mosaics 00:28:02 – Woody plant introduction in the Nilgiris grasslands 00:30:09 – Impacts of invasive species on plant species diversity and composition 00:31:26 – There’s much higher nitrogen and nitrate availability in the invaded grasslands 00:33:50 – Woody plant invasions have altered fire regimes 00:35:12 – What allows woody plants to invade grasslands? 00:40:03 – Question: How and why do plant invasions change soil nutrients? 00:42:20 – Question: Not all policies are right 00:45:59 – Question: How leaching affects organisms 00:48:23 – Introducing Aliston Texeira 00:49:03 – Observations from a farm 00:52:17 – The plants could be choosing certain niches to occupy 00:59:02 – Modern environments are inundated with pollution 01:04:16 – We need to widen our lens 01:08:30 – Question: Aliston’s observations on Wedelia (invasive plant) 01:10:53 – Discussion: The role of nutrition in a landscape 01:16:13 – Excessive nutrition is pollution and could be enabling invasions 01:16:56 – A possible scenario if an invasion isn't stopped 01:24:42 – The role of disturbance in plant distribution Q-A 01:35:33 – How do we control nutrition in natural forests which have been invaded? 01:37:37 – Managing nutrition in farmlands while maintaining biodiversity services 01:42:45 – Should restoration also focus on reducing excessive nutrition/pollution? 01:51:27 – Growth of invasives along roads and linear infrastructure 01:57:15 – A few closing thoughts