BIOLOGY PRESENTATION

PresenterNguyen Thu TrangBui Phuong NhungNguyen Thi Ngoc ChamDoan Hoang HuyClassK65KTNNELecturerPhan Thi Thuy

Introduction to Ecology

November, 20th 2021

Subject 6

Ecosystem: Structure and Dynamics

PRESENTATION

Structural components of the ecosystem

Material cycle

06

Ecosystem dynamics

03

Food webs

05

02

Population

04

Definition

01

Table of contents

Agro - ecosystems

Agro-ecosystems are created and maintained by humans based on the objective laws of nature to satisfy their needs.

01. Definition

A community of living organisms (plants, animals and microbes) in conjunction with the non-living components of their environment (air, water and mineral soil), interacting as a system

Ecosystem

- Light- Climate- Soil- Water- Dead organisms, organic waste in the environment

including abiotic factors existing in nature that combine to form a living environment

02. Structural components of the ecosystem

Non - living components (habitats)

- Production organisms (an autotrophic organism): rice, grass. - Consumers (heterotrophs that include all animals and microorganisms that survive by a primary food source produced by autotrophs): crabs, snails, birds, worms, mice, snakes. - Decomposers (makes dead plant and animal material decay): bacteria, fungi

02. Structural components of the ecosystem

Organic ingredients

The study of population dynamics in Biology is a very effective way of evaluating the impact of the physical environment on the species.

The population of each species has a unique physical distribution which changes over time and space based on how successful the species has been in thriving in that particular environment

03. Ecosystem dynamics

A study of the variation in the population of a particular species at a location over a given period of time

Change by year: rice growth, weed composition, pests, and diseases change depending on whether the year is hot or cold, drought or wet.

Seasonal change: rice in the field is man-made by planting. From sowing to harvest, the structure of the rice plant changes, leading to changes in other living populations (weeds, pests, etc.). These changes are determined by seasonal meteorological conditions, human influences, and the biological characteristics of the crop.

03. Ecosystem dynamics

Changes in the composition and structure of populations of organisms

The dynamics of the rice field ecosystem are also greatly affected by the change of natural conditions, climate... which changes the living environment so that the rice field system will change to suit the new environment. Thus, natural factors are the components that greatly affect the change of the rice field ecosystem over time

1. Human impacts: changes in rice structure, crop rotation system, technical measures. 2. The rice plant itself changes the soil properties and natural living conditions. 3. Changes in farming practices such as watering, soil amendment, mechanization, pest and weed control methods lead to changes in cropping systems or crop rotation

03. Ecosystem dynamics

Replace the composition of the main organism population

- Grasshoppers, crickets, bugs, butterflies, dragonflies, bees, birds, mice, snakes, frogs, frogs, ladybugs, ... - Stem borers, small leaf rollers,... - Fish, golden snail, ..

04. Population

- A food web is a detailed interconnecting diagram that shows the overall food relationships between organisms in a particular environment. - It can be described as a "who eats whom" diagram that shows the complex feeding relationships for a particular ecosystem.

05. Food webs

Microorganism

Snakes

Worm

Snails

Mice

Rice

Fish

Humans

Carnivorous spiders

Leaf rollers

Rice

05. Food webs

Birds

Snakes

Frogs

Flowerpecker

Stem borer

Dragonflies

Worm

Grasshoppers

Mice

Rice

05. Food webs

06. Material cycling

THANKS FOR YOUR ATTENTION

PRESENTATION