Energy Transfer in a Food Chain The Cycling of Matter in Ecosystems

today we're tackling two super important ideas about ecosystems how energy moves through food chain and how matter cycles in the environment these two processes are like Nature's Way of powering life and keeping everything running smoothly we'll also see what happens when you mess with food chain and how the cycling of matter promotes sustainability let's start with energy think of food chain as pathway that shows how energy moves from one organism to the next the energy in an ecosystem starts with the sun producers like plants capture the sun's energy through photosynthesis and turn it into food or glucose they're the first step in the food chain because they're the source of energy for everything else next up are the consumers when herbivore like rabbit eats the plant it's getting some of that stored energy but here's the catch not all the energy gets passed along only about 10% of the energy from the plant gets transferred to the rabbit the rest is used by the plant for its own life processes or lost as heat this is called the 10% rule and it applies at every level of the food chain when carnivore like fox eats the rabbit it's also getting only 10% of the rabbit's energy as you go up the food chain the amount of energy decreases which is why there are fewer Predators like foxes than plants or herbivores the energy is constantly being transferred but in smaller amounts now what happens if you alter the food chain let's say there's disease that wipes out lot of plants in forest that's going to affect everything higher up in the food chain herbivores like rabbits will have less to eat so their population might shrink if there are fewer rabbits then the foxes that rely on them for food will also struggle altering one part of the chain sends ripples throughout the entire ecosystem the balance is delicate and when one piece is removed or changed it can throw the whole system out of whack now let's talk about matter the stuff everything is made of in an ecosystem matter gets recycled over and over again unlike energy which Flows In One Direction matter moves in Cycles this includes Essential Elements like carbon nitrogen and water that all living things need to survive let's start with the carbon cycle plants take in carbon dioxide from the air during photosynthesis they use it to build their tissues and release oxygen as byproduct when animals eat the plants they take in that carbon later when animals breathe they release carbon dioxide back into the air and when plants or animals die decomposers like bacteria and fungi break down their bodies returning car carbon to the soil or atmosphere it's constant cycle that keeps carbon moving through the ecosystem another important cycle is the water cycle water evaporates from rivers lakes and oceans forms clouds and then falls back to Earth as rain or snow plants and animals use this water and then it's either absorbed into the ground or returned to the atmosphere through transpiration and evaporation the water cycle keeps ecosystems hydrated and functioning but matter doesn't just cycle by itself organisms help decomposers play huge role by breaking down dead organisms and waste this returns nutrients to the soil where plants can absorb them again continuing the cycle of life without decomposers ecosystems would eventually run out of nutrients and Life as we know it would collapse so how does the cycling of matter promote sustainability by continuously recycling elements like carbon nitrogen and water ecosystems can sustain life over the long term every time matter cycles through the environment it helps maintain the balance needed for life to thrive as long as the Cycles are working properly ecosystems can stay healthy support biodiversity and be productive this is why it's so important to keep ecosystems balanced and avoid disrupting these Cycles energy flows through ecosystems in one direction from the Sun to producers then to Consumers and finally to decomposers with less energy being transferred at each level in contrast matter cycles over and over again ensuring that ecosystems can continue to function and sustain life both of these processes are critical for the health and balance of ecosystems and any disruptions can have major consequences for the organisms that depend on them that's it for today's lesson next time you see the sun shining on plant or feel the rain remember that you're witnessing the transfer of energy and the cycling of matter in action two powerful forces keeping our planet alive and thriving