Biomes PDF

ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts BIOMES Introduction In this lesson, you will learn about the characteristics of different biomes. Also, the marine environment and freshwater ecosystem characteristics will be included in the discussions. At th...

ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts BIOMES Introduction In this lesson, you will learn about the characteristics of different biomes. Also, the marine environment and freshwater ecosystem characteristics will be included in the discussions. At the end, overall patterns of human disturbance of world biomes are presented. Learning Outcomes Intended Learning Outcome 1 (Syllabus)  Acquire high level of awareness about the environment and its significance. Topic Outcome  State the characteristics of some major terrestrial biomes as well as the factors that determine their distribution. Biomes - General type of communities with similar climate conditions, growth patterns, and vegetation types. Source: (Cunningham & Cunningham, 2012) MAJOR WORLD BIOMES Terrestrial Biomes - Characteristics of biological communities vary with temperature, precipitation, and latitude. - Hot, humid regions generally have greater biological productivity than cold or dry regions. 1|Page ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts - Climate graphs are used to describe and compare precipitation and temperature in different biomes. - Temperature and precipitation are the most important determinants in biome distribution on land. - If the general temperature range and precipitation level is known, the kind of biological community likely to occur there can be predicted in the absence of human disturbance. - Vertical zonation occurs as vegetation type change rapidly from warm and dry to cold and wet as you go up a mountain. Source: (Cunningham & Cunningham, 2012) According to average annual temperature and precipitation, shown in figure the biomes that most likely to occur in the absence of human disturbance or other disruptions. Note: This diagram does not consider soil type, topography, wind speed, or other important environmental factors. Still, it is a useful general guideline for biome location. 2|Page ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Tropical Moist Forests Kinds of Moist Tropical Forests  Cloud Forests – are found high in the mountains where fog and mist keep vegetation wet all the time.  Tropical rainforests – occur where rainfall is abundant – more than 200 cm (80 in) per year – and temperatures are warm to hot year-round. The soil of these tropical moist forest types tends to be old, thin, acidic, and nutrient-poor, yet an enormous number of species can be present. For example, it has been estimated that there are millions of insect species in the canopy of tropical rain-forests. And it is believed that one-half to two-thirds of all species of terrestrial plants and insects live in tropical forests. Source: (Giles) CLOUD FOREST Tropical montane cloud forest at about 2000 meters elevation near Tandayapa, in Pichincha Province, Ecuador, in mid-March (Giles). 3|Page ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Source: (Francis, 2019) TROPICAL RAINFOREST Tropical rainforests are located along the equator of continents such as South America, Africa, Asia and Australia. Many can also be found in Sumatra and New Guinea. The best-known tropical rainforests are: The Amazon (Brazil), El Yunque (Puerto Rico), The Congo (Africa). Tropical rainforests are usually located on the eastern coastline with warmer ocean currents, ranging between 20 and 35 degrees of latitude, but extending only about 15 degrees equatorward and 40 degrees poleward (Francis, 2019). Tropical Seasonal Forests - Drought-tolerant forests that look brown and dormant in the dry season but burst into vivid green during rainy months. - Often called Dry Tropical Forests because they are dry much of the year; however, there must be some periodic rain to support tree growth. - Many of the trees and shrubs in a seasonal forest are drought-deciduous: they lose their leaves and cease growing when no water is available. - Seasonal forests are often open woodlands that grade into savannas. 4|Page ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Source: (cyanophycean314, 2013) TROPICAL SEASONAL FOREST Tropical Savannas and Grasslands - Grasslands - also known as prairies or steppes; receive between 25 and 75 cm of rain per year. - Savannas - extensive grasslands w/ occasional or patches of trees; typically tropical w/ 50-150 cm of rain per year. - Like tropical seasonal forests, most tropical savannas and grasslands have a rainy season, but generally the rains are less abundant or less dependable than in a forest. - During dry seasons, fires can sweep across grassland, killing off young trees and keeping the landscape open. - Savannas and grassland plants have many adaptations to survive drought, heat, and fires. - Grazing pressure from domestic livestock is an important threat to both the plants and the animals of tropical grasslands and savannas. 5|Page ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Source: (Savanna Worldlife) SAVANNA Source: (Kerlin, 2018) GRASSLAND Desert - Occur where precipitation is rare and unpredictable, usually with less than 30 cm of rain per year. 6|Page ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts - Their vegetation is sparse, but it can be surprisingly diverse, and most desert plants and animals are highly adapted to survive long droughts and extreme heat, and many can survive extreme cold. - Desert is more vulnerable, sparse, slow-growing vegetation is quickly damaged by off-road vehicles. - Desert soils recover slowly. - Desert is also vulnerable to overgrazing. - In Africa’s vast Sahel (southern edge of the Sahara Desert), livestock are destroying much of the plant cover. Bare, dry soil becomes drifting sand, and restabilization is extremely difficult. Source: (Rosenberg, 2019) DESERT Temperate Grasslands - As in tropical latitudes, temperate (mid-latitude) grasslands occur where there is enough rain to support abundant grass but not enough for forests. - Most grassland is a complex, diverse mix of grasses and flowering herbaceous plants, generally known as forbs. - Deep roots help plants in temperate grasslands and savannas survive drought, fire, and extreme heat and cold. These roots, together with an annual winter accumulation of dead leaves on the surface, produce thick, organic-rich soils in temperate grasslands. 7|Page ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Source: (Savedge, 2017) TEMPERATE GRASSLAND Temperate Shrublands - Evergreen shrubs with small, leathery, sclerophyllous (hard, waxy) leaves form dense thickets. - Scrub oaks, drought-resistant pines, or other small trees often cluster in sheltered valleys. Periodic fires burn fiercely in this fuel-rich plant assemblage and are a major factor in plant succession. - In California, this landscape is called chaparral, Spanish for “thicket”. - These areas are inhabited by drought-tolerant animals such as jackrabbits, kangaroo rats, mule deer, chipmunks, lizards, and many bird species. - Very similar landscapes are found along the Mediterranean coast as well as southwestern Australia, central Chile, and South Africa. Source: (Creative Commons Zero (CC0)) CHAPARRAL 8|Page ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Temperate Forests Deciduous Forests - Broadleaf forests occur throughout the world where rainfall is plentiful. - In mid latitudes, these forests are deciduous and lose their leaves in winter. - At lower latitudes, broadleaf forests may be evergreen or drought-deciduous. - Can re-grow quickly because they occupy moist, moderate climates. - Source: (Chavasse, 2019) TEMPERATE DECIDUOUS FOREST Temperate deciduous forests are located primarily in the eastern half of the United States, Canada, Europe, parts of Russia, Chile and Japan. This biome is in the mild zone of the Northern hemisphere (Mbgnet.net, 2019) Coniferous Forests - Grow in a wide range of temperature and moisture conditions. - Often they occur where moisture is limited: in cold climates, moisture is unavailable (frozen) in winter; hot climates may have seasonal drought; sandy soils hold little moisture, and they are often occupied by conifers. - Provide most wood products in North America. - Coniferous forests of the Pacific coast grow in extremely wet conditions. The wettest coastal forests are known as temperate rainforest, a cool, rainy forest often enshrouded in fog. 9|Page ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Source: (Jordan, 2019) CONIFEROUS FOREST The Coniferous Forest is the largest terrestrial biome, found in the northern parts of Europe, North America and Asia. Boreal Forest - Or Northern Forests - Lie between about 50° and 60° north. - Mountainous areas at lower latitudes may also have many characteristics and species of the boreal forest. - Dominant trees are pines, hemlocks, spruce, cedar, and fir. - Some deciduous trees are also present, such as maples, birch, aspen, and alder. - These forests are slow-growing because of the cold temperatures and a short frost-free growing season, but they are still expansive resources. - The extreme, ragged edge of the boreal forest, where forest gradually gives way to open tundra, is known by its Russian name, Taiga. Source: (Snider, 2019) BOREAL FOREST 10 | P a g e ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Tundra - A treeless landscape that occurs at high latitudes or on mountaintops, has a growing season of only two or three months, and it may have frost any month of the year. - A variant of grasslands because it has no trees - Very cold desert because water is unavailable (frozen) most of the year. Arctic Tundra - An expansive biome that has low productivity because it has a short growing season. During midsummer, 24-hour sunshine supports a burst of plant growth and an explosion of insect life. Source: (Bailey, 2018) ARCTIC TUNDRA Alpine Tundra - Occurring on a near mountain top, has environmental conditions and vegetation similar to arctic tundra. These areas have a short, intense growing season. Many alpine tundra plants also have deep pigmentation and leathery leaves to protect against the strong ultraviolet light in the thin mountain atmosphere. 11 | P a g e ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Source: (Rinkesh) ALPINE TUNDRA Marine Ecosystem - Vary mainly with depth, temperature, and salinity. - Coral reefs and estuaries are among the world’s most productive and diverse ecosystem. - Vertical stratification is a key feature of aquatic ecosystems, mainly because light decreases rapidly with depth, and communities below the photic zone (light zone, often reaching about 20 m deep) must rely on energy sources other than photosynthesis to persist. Temperature also decreases with depth. - Deep ocean species often grow slowly in part because metabolism is reduced in cold conditions. - Temperature also affects the amount of oxygen and other elements that can be absorbed in water. - Phytoplankton are microscopic floating algae that carry on photosynthesis in pelagic ecosystem - Zooplanktons are small, weakly swimming animals that feed on phytoplankton. Ocean Systems based on depth and proximity to shore:  Benthic – communities occur on the bottom.  Pelagic zone – (from “sea” in Greek) are the water column.  Epipelagic zone – (epi = on top) has photosynthetic organisms. Below this are the mesopelagic (meso = medium), and bathypelagic (bathos = deep) zones.  Deepest layers: Abyssal Zone (to 4,000 m) and Hadal Zone (deeper than 6,000 m).  Littoral Zones – shorelines.  Intertidal Zone – area exposed by low tides. 12 | P a g e ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Source: (Cunningham & Cunningham, 2012) OCEAN SYSTEMS BASED ON DEPTH AND PROXIMITY TO SHORE Coastal Zones Coral Reefs – are among the best-known marine ecosystems because of their extraordinary biological productivity and their diverse and beautiful organisms. Source: (Madaan) CORAL REEFS 13 | P a g e ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Mangroves – are trees that grow in salt water. They occur along calm, shallow, tropical coastlines around the world. Mangrove forests or swamps help stabilize shorelines, and they are also critical nurseries for fish, shrimp, and other commercial species. Source: (Larsen) MANGROVE Estuaries – are bays where rivers empty into the sea, mixing fresh water with salt water. Source: (Wilke, 2020) ESTUARY 14 | P a g e ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Salt marshes – shallow wetlands flooded regularly or occasionally with seawater, occur on shallow coastlines, including estuaries. Source: (The Editors of Encyclopaedia Britannica) SALT MARSH Tide Pools – are depressions in a rocky shoreline that are flooded at high tide but retain some water at low tide. These areas remain rocky where wave action prevents most plant growth or sediment (mud) accumulation. Source: (Kennedy, 2020) TIDE POOLS 15 | P a g e ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Barrier Islands – are low, narrow, sandy islands that form to parallel to a coastline. They occur where the continental shelf is shallow and rivers or coastal currents provide a steady source of sediments. Source: (Peak Aerials, 2014) BARRIER ISLANDS Freshwater Ecosystems - Vary according to depth and light penetration, which control size and types of vegetation. - Often small but they are disproportionately important in biodiversity Freshwater Lakes - Like marine environments, have distinct vertical zones. Vertical Zones  Benthos – the bottom, occupied by a variety of snails, burrowing worms, fish and other organisms.  Epilimnion – a warmer upper layer that is mixed by wind and warmed by the sun.  Hypolimnion – below the epilimnion. A colder, deeper layer that is not mixed.  Thermocline – Sharp temperature boundary.  Mesolimnion – below thermocline, the water is much colder. 16 | P a g e ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Source: (Cunningham & Cunningham, 2012) Vertical Zones Source: (Pesterev, 2018) FRESHWATER LAKE National Park Banff, Banff, Canada Wetlands - Shallow ecosystems in which the land surface is saturated or submerged at least part of the year. - Have vegetation that is adapted to grow under saturated conditions. 17 | P a g e ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Swamps - Also known as wooded wetlands - Wetlands with trees. Marshes - Wetlands without trees. Bogs - Areas of saturated ground, and usually the ground are composed of deep layers of accumulated, undecayed vegetation known as peat. Fens - Similar to bogs except that they are mainly fed by groundwater, so that they have mineral-rich water and specially adapted plant species. Human Disturbance - Humans have become dominant organisms over most of the earth, damaging or disturbing more than half of the world’s terrestrial ecosystems to some extent. - By some estimates, humans preempt about 40 percent of the net terrestrial primary productivity of the biosphere either by consuming it directly, by interfering with its production or use, or by altering the species composition or physical processes of human-dominated ecosystems. - Conversion of natural habitat to human uses is the largest single cause of biodiversity losses. - Researchers from the environmental group Conservation International have attempted to map the extent of human disturbance of the natural world. See below figure. Source: (Cunningham & Cunningham, 2012) DOMESTICATED LANDS 18 | P a g e ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts - The greatest impacts have been in Europe, parts of Asia, North and Central America, and islands such as Madagascar, New Zealand, Java, Sumatra, and those in the Caribbean. Source: (Cunningham & Cunningham, 2012) References: Bailey, R. (2018, December 13). Land Biomes: Tundra. Retrieved July 27, 2020, from ThoughtCo.: https://www.thoughtco.com/land-biomes-tundra-373498 Chavasse, T. (2019, September 16). Temperate Deciduous Forest. Retrieved July 27, 2020, from ArcGIS Story Maps: https://storymaps.arcgis.com/stories/bb58b3d541fd49fea03b966a09a933ae Creative Commons Zero (CC0). (n.d.). Chaparral, Vegetation, Shrubland, Ecosystem. Retrieved July 27, 2020, from Dreamstime: https://www.dreamstime.com/chaparral-vegetation-shrubland-ecosystem- public-domain-image-free-131165140 Cunningham, W. P., & Cunningham, M. A. (2012). Environmental Science: A Global Concern, Twelfth Edition. 1221 Avenue of the Americas, New York, NY 10020: The McGraw-Hill Companies, Inc. cyanophycean314. (2013, October 1). The Tropical Seasonal Forest. Retrieved July 27, 2020, from Carlo's Biome Travel Blog: https://carlosbiometour.wordpress.com/2013/10/01/the-tropical-seasonal-forest/ Francis, A. (2019, Septemeber 17). Tropical Rainfores Biome. Retrieved July 27, 2020, from ArcGIS Story Maps: https://storymaps.arcgis.com/stories/4c9bdb692b284ceebae68fa42fd4a9a7 Giles, V. (n.d.). Cloud Forest in Ecuador. Retrieved July 27, 2020, from Science Photo Library: https://www.sciencephoto.com/media/535398/view/cloud-forest-in-ecuador 19 | P a g e ENGG 413 ENVIRONMENTAL SCIENCE AND ENGINEERING Main Topic 1: Ecological Concepts Jordan, G. (2019, September 17). Coniferous Forest. Retrieved July 27, 2020, from ArcGIS Story Maps: https://storymaps.arcgis.com/stories/7c71f3b04ed648c8ab3d7976bde7e6ae Kennedy, J. (2020, January 11). Tidal Pool. Retrieved July 27, 2020, from ThoughtCo.: https://www.thoughtco.com/tidal-pool-overview-2291685 Kerlin, K. (2018, July 9). Grasslands More Reliable Carbon Sink Than Trees. Retrieved July 27, 2020, from Science and Climate: https://climatechange.ucdavis.edu/news/grasslands-more-reliable-carbon-sink- than-trees/ Larsen, T. (n.d.). Share the Facts about Mangroves. Retrieved July 27, 2020, from Conservation International: https://www.conservation.org/act/share-the-facts-about-mangroves Madaan, S. (n.d.). Coral Reef Biome. Retrieved July 27, 2020, from Earth Eclipse: https://www.eartheclipse.com/ecosystem/coral-reef-biome.html Mbgnet.net. (2019). Temperate Deciduous Forest Locations. Retrieved July 27, 2020, from Mbgnet.net: http://www.mbgnet.net/sets/temp/locatns.htm Peak Aerials. (2014, December 15). Coastal Barrier Islands, Florida. Retrieved July 27, 2020, from Peak Aerials: https://www.stockaerialphotos.com/media/f62bcb65-58da-4115-b93d-ffd5e849c698-coastal- barrier-islands-florida Pesterev, S. (2018, November 16). National park Banff, Banff, Canada. Retrieved July 27, 2020, from Unsplash: https://unsplash.com/photos/Yk6DfYbMDIA Rinkesh. (n.d.). Alpine Tundra Biome: Location, Climate, Vegetation and Animals. Retrieved July 27, 2020, from Conserve Energy Future: https://www.conserve-energy-future.com/alpine-tundra-biome.php Rosenberg, M. (2019, January 21). Desert Definition and Characteristics. Retrieved July 27, 2020, from ThoughCo.: https://www.thoughtco.com/all-about-deserts-1435317 Savanna Worldlife. (n.d.). World Life of the Savanna's. Retrieved July 27, 2020, from Savanna Worldlife: https://savannaworldlife.weebly.com/ Savedge, J. (2017, March 17). Life In A Temperate Grassland. Retrieved July 27, 2020, from ThoughtCo.: https://www.thoughtco.com/life-in-a-temperate-grassland-3957466 Snider, T. (2019, November 7). Boreal Forest/ Taiga. Retrieved July 27, 2020, from ArcGIS Story Maps: https://storymaps.arcgis.com/stories/d19b5fa0800f4927809f01729b4b35b3 The Editors of Encyclopaedia Britannica. (n.d.). Salt Marsh. Retrieved July 27, 2020, from Encyclopaedia Britannica: https://www.britannica.com/science/salt-marsh Wilke, C. (2020, January 27). Scientists Say: Estuary. Retrieved July 27, 2020, from Science News for Students: https://www.sciencenewsforstudents.org/article/scientists-say-estuary 20 | P a g e