The document discusses various barriers that limit the dispersal and distribution of animal species. There are three main categories of barriers: physical, climatic, and biological. Physical barriers include mountains, water bodies, and deserts which can isolate populations. Climatic barriers like temperature, humidity, and light also influence animal ranges. Biological barriers involve interactions with vegetation and other animals through predation, parasitism, and competition for resources. Together, these natural barriers influence the evolution and geographic distribution of wildlife.
There are few places left on the planet where the impact of people has not been felt. We have explored and left our footprint on nearly every corner of the globe. As our population and needs grow, we are leaving less and less room for wildlife.
Wildlife are under threat from many different kinds of human activities, from directly destroying habitat to spreading invasive species and disease. Most ecosystems are facing multiple threats. Each new threat puts additional stress on already weakened ecosystems and their wildlife.
Zoogeographers formulate theories to explain the distribution, based on information about geography, physiography, climate, and geologic history, as well as knowledge of the evolutionary history and relationships of the animals involved
There are few places left on the planet where the impact of people has not been felt. We have explored and left our footprint on nearly every corner of the globe. As our population and needs grow, we are leaving less and less room for wildlife.
Wildlife are under threat from many different kinds of human activities, from directly destroying habitat to spreading invasive species and disease. Most ecosystems are facing multiple threats. Each new threat puts additional stress on already weakened ecosystems and their wildlife.
Zoogeographers formulate theories to explain the distribution, based on information about geography, physiography, climate, and geologic history, as well as knowledge of the evolutionary history and relationships of the animals involved
Insular fauna is the fauna situated on an island. There are different types of islands and they are different from each other because of their age and there way of emergence. There are Continental Islands, Oceanic islands and ancient islands.
A zoogeographical region/realm is a sub-division of the Earth having a unique fauna, i.e. species that are found only in that area. Alfred Russel Wallace introduced six zoogeographical realms: Palearctic, Ethiopian, Oriental, Australian, Neotropical, and Nearctic regions. This is a brief overview of each.
Evolution is a developmental process from simple to complex form of life. Evolution of elephant started 60mya, from size of a pig. It spread all over world especially Africa and Asia. Today only two species Loxodonta and Elephas exist.
Many types of fish migrate on a regular basis, on time scales ranging from daily to annually or longer, and over distances ranging from a few metres to thousands of kilometres. Fish usually migrate to feed or to reproduce, but in other cases the reasons are unclear.
Migrations involve the fish moving from one part of a water body to another on a regular basis. Some particular types of migration are anadromous, in which adult fish live in the sea and migrate into fresh water to spawn, and catadromous, in which adult fish live in fresh water and migrate into salt water to spawn.
Marine forage fish often make large migrations between their spawning, feeding and nursery grounds. Movements are associated with ocean currents and with the availability of food in different areas at different times of year. The migratory movements may partly be linked to the fact that the fish cannot identify their own offspring and moving in this way prevents cannibalism. Some species have been described by the United Nations Convention on the Law of the Sea as highly migratory species. These are large pelagic fish that move in and out of the exclusive economic zones of different nations, and these are covered differently in the treaty from other fish.
Salmon and striped bass are well-known anadromous fish, and freshwater eels are catadromous fish that make large migrations. The bull shark is a euryhaline species that moves at will from fresh to salt water, and many marine fish make a diel vertical migration, rising to the surface to feed at night and sinking to lower layers of the ocean by day. Some fish such as tuna move to the north and south at different times of year following temperature gradients. The patterns of migration are of great interest to the fishing industry. Movements of fish in fresh water also occur; often the fish swim upriver to spawn, and these traditional movements are increasingly being disrupted by the building of dams.
migration and dispersal are most popular terminology in bio-geographical context. Those processes help us to understand how species spread all over the earth.
Iczn(The International Commission on Zoological Nomenclature )Al Nahian Avro
The International Commission on Zoological Nomenclature (ICZN) acts as adviser and arbiter for the zoological community by generating and disseminating information on the correct use of the scientific names of animals. The ICZN is responsible for producing the International Code of Zoological Nomenclature - a set of rules for the naming of animals and the resolution of nomenclatural problems.
This is a brief overview of the type of zoogeographic distributions of animals, such as cosmopolitan, discontinuous, endemic, isolated, and bipolar distributions.
Insular fauna is the fauna situated on an island. There are different types of islands and they are different from each other because of their age and there way of emergence. There are Continental Islands, Oceanic islands and ancient islands.
A zoogeographical region/realm is a sub-division of the Earth having a unique fauna, i.e. species that are found only in that area. Alfred Russel Wallace introduced six zoogeographical realms: Palearctic, Ethiopian, Oriental, Australian, Neotropical, and Nearctic regions. This is a brief overview of each.
Evolution is a developmental process from simple to complex form of life. Evolution of elephant started 60mya, from size of a pig. It spread all over world especially Africa and Asia. Today only two species Loxodonta and Elephas exist.
Many types of fish migrate on a regular basis, on time scales ranging from daily to annually or longer, and over distances ranging from a few metres to thousands of kilometres. Fish usually migrate to feed or to reproduce, but in other cases the reasons are unclear.
Migrations involve the fish moving from one part of a water body to another on a regular basis. Some particular types of migration are anadromous, in which adult fish live in the sea and migrate into fresh water to spawn, and catadromous, in which adult fish live in fresh water and migrate into salt water to spawn.
Marine forage fish often make large migrations between their spawning, feeding and nursery grounds. Movements are associated with ocean currents and with the availability of food in different areas at different times of year. The migratory movements may partly be linked to the fact that the fish cannot identify their own offspring and moving in this way prevents cannibalism. Some species have been described by the United Nations Convention on the Law of the Sea as highly migratory species. These are large pelagic fish that move in and out of the exclusive economic zones of different nations, and these are covered differently in the treaty from other fish.
Salmon and striped bass are well-known anadromous fish, and freshwater eels are catadromous fish that make large migrations. The bull shark is a euryhaline species that moves at will from fresh to salt water, and many marine fish make a diel vertical migration, rising to the surface to feed at night and sinking to lower layers of the ocean by day. Some fish such as tuna move to the north and south at different times of year following temperature gradients. The patterns of migration are of great interest to the fishing industry. Movements of fish in fresh water also occur; often the fish swim upriver to spawn, and these traditional movements are increasingly being disrupted by the building of dams.
migration and dispersal are most popular terminology in bio-geographical context. Those processes help us to understand how species spread all over the earth.
Iczn(The International Commission on Zoological Nomenclature )Al Nahian Avro
The International Commission on Zoological Nomenclature (ICZN) acts as adviser and arbiter for the zoological community by generating and disseminating information on the correct use of the scientific names of animals. The ICZN is responsible for producing the International Code of Zoological Nomenclature - a set of rules for the naming of animals and the resolution of nomenclatural problems.
This is a brief overview of the type of zoogeographic distributions of animals, such as cosmopolitan, discontinuous, endemic, isolated, and bipolar distributions.
This ppt discusses the different aspects of regional classification of zoogeographic regions. It puts emphasis on the where and why, climate and all the aspects of discoverability.
Points on biomes,habitat,ecotone and their differentations.
also on terrestrial ,wetland,fresh water,marine habitat and their types .Explained much with pictures..so easy to remember and to take class .Hope this may help....
Malpighian tubules and Coxal Glands in Arachnidsنوشی نایاب
Malpighian Tubules. Malpighian tubules remove nitrogenous wastes
(uric acid) from the hemocoel. Various ions are actively transported
across the outer membrane of the tubule. Water follows these ions
into the tubule and carries amino acids, sugars, and some nitrogenous
wastes along passively. Some water, ions, and organic compounds are
reabsorbed in the basal portion of the Malpighian tubules and the
hindgut; the rest are reabsorbed in the rectum. Uric acid moves into
the hindgut and is excreted in the feces.
Coxal Glands in Arachnids. ( a ) The gut and excretory systems of a
spider. The stercoral pocket is a diverticulum off the hindgut that stores
waste prior to waste elimination. ( b ) Coxal gland muscles attach to the
thin saccular fi ltration membrane. These muscles promote fi ltration and
fl uid fl ow (black arrows) by contracting and relaxing along the tubular
duct. Water and solutes are reabsorbed along the tubular duct.
Toxicology
is a scientific discipline, overlapping with biology, chemistry, pharmacology, and medicine, that involves the study of the adverse effects of chemical substances on living organisms and the practice of diagnosing and treating exposures to toxins and toxicants.
Toxicity
is the degree to which a chemical substance or a particular mixture of substances can damage an organism
History
Ecotoxicology is a relatively young discipline that made its debuts in the 1970s
Ecotoxicology emerged after pollution events that occurred after World War II heightened awareness on the impact of toxic chemical and wastewater discharges towards humankind and the environment
The term « Ecotoxicology » was used for the first time in 1969 by René Truhaut, a toxicologist, during an environmental conference in Stockholm.
hese groups should include the most recent ancestral species and all of its descendants called a monophyletic group
A paraphyletic group includes some, but not all, descendants of a most recent common ancestor.
Paraphyletic groups may also result when knowledge of the group is insufficient and the relationships need clarification in genetic and evolutionary contexts
Polyphyletic groups do not contain the most recent common ancestor of all members of the group. Members of a polyphyletic group have at least two phylogenetic origins.
it is possible to have more than two allelic forms, i.e., multiple alleles, of one kind of gene.
The best examples of multiple allelic system have been observed in coat colour of rabbits, wings of Drosophila and blood groups in man
allelomorphs, monohybrid cross dihybrid cross mutant alleles
wild type
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
2. BARRIERS TO DISPERSAL
• External factors which limit the dispersal or
distribution of organisms are called barriers.
• Barriers are always relative because a barrier
for one group of animals may be a means of
dispersal for another.
• The barriers have not remained constant in
geological past.
3. • Land masses and seas have shifted their
position, providing either means of dispersal or
creating barriers.
• Thus groups of animals became extinct,
isolated or evolved into new species.
• For example, there are no wild camels in North
America today but their fossil record suggest
that in the geological past they were widely
distributed throughout NorthAmerica.
4. TYPES OF BARRIERS
• Barriers may be classified into three main
categories:
1. Physical Barriers
2. Climatic Barriers
3. Biological Barriers
5. 1. PHYSICAL BARRIERS
• The main physical barriers may be discussed
under the following headings:
a) Mountains
b) Water bodies
c) Deserts
6. a. MOUNTAINS
• High mountain ranges are effective topographic
barriers, which prevent the animaldispersal.
• Himalayan mountain range is an effective barrier
between India and Eurasia.
• On southern side, moist hot plains of India have
elephants, rhinoceros, tigers, deer and peacock,etc.
• On northern side, climate is temperate and the fauna
includes animals like oxen, sheep, pigs, hyenas,etc.
7.
8. b. WATER BODIES
• Large water bodies like vast oceans or sea channels form
notable barriers to the distribution of amphibians, reptiles
and mammals.
• Mozambique Channel which separates Madagascar Island
from its main land Africa, is only 40 km wide, yet the fauna
of the two regions is quite different.
• Modern amphibians and freshwater fishes are prevented
from dispersal by large bodies ofsaltwater.
• For birds and bats, water bodies are not barriers todispersal.
9.
10. c. DESERTS
• Extensive hot and dry desert of the world are an
effective barrier to the animals which are unable to
survive under such a hostile conditions.
• Sahara desert forms an area of demarcation between
Ethiopian and Palaearctic region.
• In the south animals like gorilla, zebra, giraffe, elephant
and rhinoceros are present.
• In the north mammals like goats, pigs and oxen are
present.
• Kalahari desert is responsible for the distinctive fauna of
Central Africa from that of Cape of Good Hope.
11.
12. 2. CLIMATIC
BARRIER
S
• The climatic barriers include all the abiotic
factors which control the survival and dispersal
of animals. The main factors are:
a) Temperature
b) Humidity
c) Light
13. a. TEMPERATURE
• The lowest recorded temperature on the earth is about -
126.9 F° and the highest is 136.4 F°.
• Variability in thermal values is an important limiting
factor that effects the distribution of animals.
• Cold-blooded animals are not found on the poles.
Amphibians and reptiles are abundant in the tropics. Their
diversity and number decrease as we move from
temperate regions to the poles.
• Temperature has a direct effect on growth and diversity of
vegetation, which in turn effects the distribution of
various animal groups.
14. b. HUMIDITY
• Some animals are found only under very humid
conditions while others prefer dry habitats.
• Many subterranean species like centipedes and
millipedes are found only in damp soil and can
not survive if exposed to dry air for long time.
• Likewise, the increase in moisture renders a
region unsuitable for the species which are
adapted to dry habitat.
15. c. LIGHT
• Light directly affects several activities of animals like growth,
locomotion, migration and dispersal.
• Light has a profound effect on aquatic habitat.
• Light penetration in water bodies affects the distribution of plants
and consequently the distribution of animals.
• In lakes and oceans, copepods and zooplanktons exhibit circadian
rhythms by showing diurnal changes in their vertical distribution.
• On land, the light has an indirect effect on animal dispersal since
it controls the growth and variety of vegetation.
16. 3. BIOLOGICAL BARRIERS
• The biological barriers include:
a) Effect of vegetation type on
animal dispersal.
b) Effect of various interactions
among animal groups on their
dispersal.
17. a. VEGETATION
• Vegetation effects the distribution of animals directly
as well as indirectly.
• Plants not only provide food to animals but specific
types of habitats also.
• The animals present in forests, grasslands, deserts, are
adapted to their particular habitat.
• European crested tits, for example, live only in
Coniferous trees and many kinds of insects are
dependent on particular species of plants for their
food.
18. MONOPHAGIC SPECIES
• Some animal species are called Monophagic,
i.e., feeding on a single type of food only.
• Panda lives in a forest and feeds on young
bamboo shoots only.
• Koala bear lives in Australia and feeds upon
Eucalyptus leaves only.
• Monophagic species would not survive if their
food is not available.
19. • Lack of vegetation limits the distribution of many
animals very efficiently.
• Many primates (monkeys, gibbons, chimpanzees, etc.)
inhabit forests where trees serve them to provide food,
shelter and an efficient mode of locomotion.
• The dense forests which are impassable for large
ungulates and act as an effective barrier for dispersal.
• For arboreal animals open grasslands act as effective
barrier for their dispersal.
20. Koala feeds upon Eucalyptus leaves only. Panda feeds on young bamboo shoots only.
21. b. ANIMALS
• Various types of interactions among different
groups of animals also regulate their dispersal.
Such as :
a) Animals prey on one another.
A carnivore (predator) may destroy a
herbivore population completely.
b) Animals parasitize one another.
Many parasites regulate the dispersal and
perpetuation of their host species.
c) Animals compete with each other for food
space, breeding or nesting sites etc.