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Phycology and Phycology Lab Course by Dr. Mohamed Jawad Al-Haidarey Ecological Biogeochemistry / Phycology PowerPoint Presentation
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Phycology and Phycology Lab Course by Dr. Mohamed Jawad Al-Haidarey Ecological Biogeochemistry / Phycology. Textbooks: Lectures, required reading :. Linda E Graham & Lee W Wilcox (2000) Algae , Prentice-Hall.

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Phycology and Phycology LabCourse

by

Dr. Mohamed Jawad Al-HaidareyEcological Biogeochemistry / Phycology

textbooks lectures required reading
Textbooks: Lectures, required reading:
  • Linda E Graham & Lee W Wilcox (2000) Algae , Prentice-Hall.
  • Marty Kelly & Richard Telford (2007) Common fresh water diatoms of Britain and Ireland.
  • Janet R stein (1975) Hand book of phcological methods, culture methods, and growth measurements.
  • السعدي، حسين علي و نضال ادريس سليمان (2007) علم الطحالب
  • مورس ، ايان (1979) مقدمة الطحالب
  • بغدادي ، وفاء (1985) الاشنات والطحالب البحرية
attendance politics
Attendance politics:

Regular attendance of lectures and lab classes is expected. It is further expected that students show up in time. For both the lecture and the lab classes, the student who comes late most will have to bring doughnuts or some food for the next lecture

 .

phycology syllabus
Phycology Syllabus

· Cryptophytes

· Prymensiophytes (Haptophytes)

· Dinophytes (Dinoflagellates)

· Introduction to the Ochrophytes

· Diatoms

· Raphidophytes and Chrysophyceans

· Synurophyceans, silicoflagellates, pedinelids, tribophyceans

· Phaeophytes (Brown algae)

· Rhodophytes (Red algae)

· Introduction to the Green algae

· Prasinophyceans

· Ulvophyceans

· Trebouxiophyceans

· Chlorophyceans

· Charophyceans

· Ecology of macroalgae and periphyton

· Introduction to phycology

· Basics of algal biology

· Reproduction in algae

· The role of algae in biogeochemistry

· Algae in biological associations

· The role of algae in aquatic food webs

· Taxonomy and Systematics of Algae

· Phytoplankton size in ecology

· The physical environment: temperature, light, turbulence

· Growth of phytoplankton

· Losses of phytoplankton

· Swimming and bouyancy

· Cyanobacteria

· The origin of eukaryotic algae

· Euglenophytes

introduction to algal characteristics and diversity

INTRODUCTION TO ALGAL CHARACTERISTICS AND DIVERSITY

PHYCOLOGY=STUDY OF ALGAE

Phycology is the science (gr. logos) of algae (gr. phycos). This discipline deals with the morphology, taxonomy, phylogeny, biology, and ecology of algae in all ecosystems

fossil history of algae
FOSSIL HISTORY OF ALGAE
  • 3.5 billion yrs ago
  • Cyanobacteria—first algae
  • Prokaryotes—lack membrane bound organelles
  • Later eukaryotes evolved—mitochondria, chloroplasts, and chromosomes containing DNA.
where are algae abound
Where are algae abound?
  • Kelp  forest up to 50 m height are the marine equivalent to terrestrial forest; mainly built by brown algae.
  • Some algae encrust with carbonate, building reef-like structures; Cyanobacteria can from rock-like structures in warm tidal areas: stromatolites.
where are algae abound8
Where are algae abound?
  • Algae grow or are attached to animals and serve as camouflage for the animal
  • Algae live as symbionts in animals such as Hydra, corals, or the protozoan ciliate Paramecium; in corals they are referred to as zooxanthellae
where are algae abound9
Where are algae abound?
  • Small algae live on top of larger algae: epiphyton
  • Algae in free water: phytoplankton
  • Terrestrial algae
    • Algae have adapted to life on land and occur as cryptobiotic  crusts in desert and grassland soils or endocryptolithis algae in rocks 
where are algae abound10
Where are algae abound?
  • Algae live on the snow cover of glaciers and in the brine channels of sea ice.
  • A symbiosis of algae and fungi produced the lichens, which are pioneer plants, help convert rock into soil by excreting acids, stabilize desert soil, are sensitive to air pollution
where are algae abound11
Where are algae abound?
  • Algae can cover trees or buildings green or live in the hollow hairs of ice bears
algal blooms
Algal Blooms
  • Algae can be so dominant that they discolor the water 
  • Higher amounts of nutrients are usually the cause
  • Algal blooms can have harmful effects on life and ecosystem:
    • Reduced water clarity causes benthic communities to die off
    • Fish kills are common effects
    • 50% of algal blooms produce toxins harmful to other organisms, including humans
    • Algal blooms produce a shift in food web structure and species composition
  • Algal blooms can mostly be linked to sewage input or agricultural activities, leading to nutrient pollution: Eutrophication
summery of the lecture one
Summery of the lecture one
  • We can find Algae in different Size (from some microns to more than 60 meters)
  • We can find Algae in different region (soil, water, animal , plants … etc)
  • Some of algae are prokaryotes and others are eukaryotes.
summery of the lecture one15
Summery of the lecture one
  • In the aquatic ecosystems we can find algae as :
  • Attachment:
  • Epipelic / on the clay
  • Epipzamic / on the sand
  • Epilithic / on the rocks.
  • Epiphytic / on the plants
  • Epizoic / on the animals
  • Endozoic / in the animals body
  • Endophytic / in the plants body
  • As Plankton:
  • Euphytoplankton / all the life cycle is plankton
  • Tychophytoplankton / some of the life cycle is plankton
summery of the lecture one16
Summery of the lecture one
  • According to environments we can subdivided Algae in to :
  • Halophyts: in region with high salinity.
  • Thermophyts: in region with high temperature.
  • Cryptophyts: in the region with low temperature.
  • In the trrastrial environments we can classified Algae in to :
  • Lithophyts
  • Epidaphics
  • Endodaphics
  • Casmolithics
slide17
Quiz:
  • Please, in short, Clarified:

what is Phycology means? And where are algae abound?

Don’t be Cheat

If you did you are cheater

algae
ALGAE
  • How are algae similar to higher plants?
  • How are algae different from higher plants?
similarities
Similarities
  • Presence of cell wall—mostly cellulosic.
  • Autotrophs/Primary producers—carry out photosynthesis
  • Presence of chlorophyll a
differences
Differences
  • Algae lack the roots, stems, leaves, and other structures typical of true plants.
  • Algae do not have vascular tissues—non vascular plants
  • Algae do not form embryos within protective coverings—all cells are fertile.
  • Variations in pigments.
  • Variations in cell structure—unicellular, colonial and multicellular forms.
prokaryotic vs eukaryotic algae
PROKARYOTIC VS EUKARYOTIC ALGAE

Prokaryotes

---No nuclear region and complex organelles—chloroplasts, mitochondria, golgi bodies, and endoplasmic reticula.

-- Cyanobacteria. Chlorophylls are on internal membranes of flattened vesicles called thylakoids-contain photosynthetic pigments. Phycobiliproteins occur in granular structures called phycobilisomes.

  • Prokaryote algal cell

Source: http://www.botany.hawaii.edu/faculty/webb/BOT311/Cyanobacteria/Cyanobacteria.htm

prokaryotic and eukaryotic algae
Prokaryotic and Eukaryotic Algae
  • Eukaryotes

---Distinct chlorplast, nuclear region and complex organelles.

--- Thylakoids are grouped into grana

pyrenoids are centers of carbon dioxide fixation within the chloroplasts of algae and hornworts. Pyrenoids are not membrane-bound organelles, but specialized areas of the plastid that contain high levels of ribulose-1,5-bisphosphate carboxylase/oxygenase

granum with a

Stack of thylakoids

pyrenoid

forms of algae
Forms of Algae
  • BODY OF AN ALGA=THALLUS
  • DIVERSITY IN MORPHOLOGY

----MICROSCOPIC

Unicellular, Colonial and Filamentous forms.

Source: http://images.google.com/images

forms of algae25
Forms of Algae

MACROALGAE

forms of algae26
Forms of Algae

MICRO ALGAE

forms of algae27
Forms of Algae
  • Unicells: single cells, motile with flagellate (like Chlamydomonas and Euglena) or nonmotile (like Diatoms)
slide28
2. Multicellular form: the vegetation forms are in six forms:
  • Colonies:
  • Assemblage of individual cells with variable or constant number of cells that remain constant throughout the colony life in mucilaginous matrix (containing an extracellular matrix made of a gelatinous glycoprotein), these colonies may be motile (like Volvox and Pandorina) or nonmotile (like Scendesmus and Pediastrum).
slide29
Coenobium:

Colony with constant number of cells, which cannot survive alone; specific „tasks“ among groups of cells is common (is a colony containing a fixed number of cells, with little or no specialization)

slide30
b. Aggregations: is aggregation of cells that have ability to simple division (so, its colony but unconstant in form and size), the aggregations are in several types:
  • Palmelloid form: non-motile cells embedded in mucilage (like Tetraspora).
slide33

c. Filaments: daughter cells remain attached after cell division and form a cell chain; adjacent cells share cell wall (distinguish them from linear colonies!); maybe unbranched (uniseriate such as Zygnema and Ulthrix) or branched (regular mutiseriate such as Cladophora or unregulermutiseriate such as Pithophora).

Cladophora

Pithophora

slide34

d. Coenocytic or siphonaceaousforms: one large, multinucleate cell without cross walls such as Vaucheria

slide35

e. Parenchymatous (such as Ulva ) and algae: mostly macro-scopic algae with tissue of undifferentiated cells and growth originating from a meristem with cell division in three dimensions

slide36

; pseudoparenchymatous (such as Batrachospermum) pseudoparenchymatous superficially resemble parenchyma but are composed of apprised filaments

slide37

f. Erect thallus forms: Thallus, from LatinizedGreek (thallos), meaning a green shoot or twig, is an undifferentiated vegetative tissue (leaves, roots, and stems) of some non-mobile organisms such as Chara and Nitella.

Chara

cellular organization
CELLULAR ORGANIZATION
  • Flagella=organs of locomotion.
  • Chloroplast=site of photosynthesis. Thylakoids are present in the chloroplast. The pigments are present in the thylakoids.
  • Pyrenoid-structure associated with chloroplast. Contains ribulose-1,5-bisphosphate Carboxylase, proteins and carbohydrates.
  • Eye-spot=part of chloroplast. Directs the cell towards light.

Source: A Biology of the Algae

By Philip Sze, third edition, WCB MCGraw-Hill

variations in the pigment constitution
Variations in the pigment constitution
  • Chlorophylls (green)
  • Carotenoids (brown, yellow or red)
  • Phycobilins (red pigment-phycoerythrin

blue pigment –phycocyanin)

summery of lecture two
Summery of lecture two:

Forms of algae

Multicellular

Unicellular

  • Colonies
  • 2. Aggregations
    • Palmelloid (Tetraspora)
    • Dendroid (Dinobryon)
    • Amoeboid (Chlororachnion)
  • 3.Filaments
  • 4. Coenocytic / Vaucheria
  • 5.Parenkematus/ Ulva
  • 6. Psedoparenkematus/ Batrachospermum
  • 7. Erect thallus / Chara

Non motile(Chlorella)

Motile (Euglena)

quiz of lecture two
Quiz of lecture two

Don’t be Cheat

If you did you are cheater

What is Pyrinoid ?

growth in algae
Growth in algae
  • Diffuse or generalized growth: (Ulva).
  • Localized growth:
    • Apical growth: (Chara, Cladophora).
    • Basal growth: (Bulbochaete).
    • Intercalary growth: (Laminaria, Oedogonium).
    • Trichothallic growth: (Ectocarpus)
growth in algae44
Growth in algae

Apical and intercalary

Tricothallic

reproduction in algae
Reproduction in algae

The reproduction of algae can be discussed under two types, namely, asexual reproduction and sexual reproduction. The former type refers to reproduction in which a new organism is generated from a single parent. In case of sexual type, two haploid sex cells are fused to form a diploid zygote that develops into an organism. Let's discuss in brief about the asexual and sexual reproduction in algae along with examples.

slide46

First: Asexual Reproduction includes:

  • 1. Vegetation reproduction:
    • In unicellular algae: simple cell division some time called binary fission (such as Gleocapsa).
    • In multicellular (colonies, filamentous, thallus, etc) by:
    • Fragmentation such as Microsystis.
    • Hormogonia: A small, motile filament, formed by some Cyanobacteria, that detaches and grows by cell division into a new filament such as Oscillatoria.
    • Propagules: a structure capable of producing a new individual such as Sphacelaria.
vegetative reproduction
Vegetative reproduction

Cell Division

A cell could not keep growing bigger forever. Food molecules could not reach the inside of a large cell fast enough to keep it alive. So when a cell reached a certain size it had to divide into two smaller cells called daughters. The daughters grew and, when they reached that certain size, they too divided, this processes called binary fission.

But this caused a problem, Why?.

vegetative reproduction48
Vegetative reproduction

Hormogonia in Oscillatoria

slide50

2. Another method of asexual reproduction in algae is by formation of spores; the algal species Ulothrix, Chlamydomonas and Chlorella reproduce by this method. Depending upon the algal species, the spores can be produced in normal vegetative cells or specialized cells called sporangia. They are either motile called zoo spores or non motile called akinete spores.

slide52

There are a lot of types of akinete spores such as:

  • Autospores: immobile spores that cannot develop flagella such as Chlorella.
  • Aplanospores: immobile spores that may nevertheless potentially grow flagella.
  • Hypnospores: A thick-walled resting cyst.
  • Tetraspores: spores produced by a tetrasporophyte, characteristic of red algae.
  • Statospores: spores that are not actively discharged from the algal fruiting body
  • Auxospores: A spore in diatom algae that leads to reformation of an enlarged vegetative cell.
second sexual reproduction
Second: Sexual Reproduction:

As already mentioned, sexual reproduction takes place by the union of male and female gametes. The gametes may be identical in shape and size called isogamy or different called heterogamy. Some of the simplest forms of algae like Spirogyra reproduce by the conjugation method of sexual reproduction. In the process of conjugation, two filamentous strands (or two organisms) of the same algae species exchange genetic material through the conjugation tube. Among two strands, one acts as a donor and another serves as a receiver. After exchanging the genetic material, two strands separate from each other. The receiver then give rise to a diploid organism.

second sexual reproduction54
Second: Sexual Reproduction:

Isogamy: is the form of sexual reproduction in which the gametes produced are identical in shape, size and motility. There is no structural distinction between "male" and "female" gametes. Pairs of isogametes align themselves with their flagellar poles touching and after several seconds, the motile gametes fuse to form a single, non-motile, diploid zygote.

second sexual reproduction55
Second: Sexual Reproduction:

Isogametes, less commonly, may be non-motile structures. A specific example exhibiting non-motile isogametes is the reproductive process known as conjugation, in Figure below, the conjugating Spirogyra identify the four stages of the process as outlined.

Isogamy in Spirogyra sp.

slide56

A. Resting filaments of alga cells.

B. Formation of conjugation tubes between two adjacent filaments.

C. Cytoplasmic contents of each cell form a compact mass, representing an isogamete. The isogametes from one filament migrate through the conjugation tubes into the adjacent filament.

The two isogametes unite to form a zygote. Each zygote eventually undergoes meiosis to form four haploid cells. One haploid cell will form a new filament by mitosis, the other three degenerate.

slide57

Heterogamy

In heterogamy, two different types of gametes are produced. The male gamete, the sperm cell, is typically very small, highly motile and is produced in very large numbers. The female gamete, the egg cell, is much larger and non-motile, called Oogamy. Fewer female gametes are produced but each is usually afforded some protection. Heterogametes are also produced by higher plants and animals.

Oedogonium sp. is a green alga that produces heterogametes. The figure bellow illustrates the life cycle of this alga. You can locate a mature egg cell and the small male filaments, which are the site of sperm production, the egg cells and male filaments are usually adjacent to one another on the same algal strand.

sexual reproduction
SEXUAL REPRODUCTION
  • ISOGAMY-Both gametes have flagella and similar in size and morphology.
  • ANISOGAMY-Gametes have flagella but are dissimilar in shape and size. One gamete is distinctly smaller than the other one.
  • OOGAMY-gamete with flagella (sperm) fuses with a larger, non flagellated gamete (egg).
reproduction
REPRODUCTION

Sexual-Gametes

Vegetative

Cell divisions/Fragmentation

=part of the filament

breaks off from the rest and forms a new one.

Asexual Reproduction

Zoospores after losing their flagella,

form new filaments. No sexual fusion.

slide61

a, b, and c are zoospores

d, e, and f are aplanospores

g, and h are hypnospores

K is autospores.

L is Isogamous, m is Anisogamous, and n is Oogamous

slide62

Gametes look like vegetative cells or very different

  • Isogamy: both gametes look identical
  • Anisogamy: male and female gametes differ morphologically
  • Oogamy: One gamete is motile (male), one is nonmotile (female)
  • Monecious: both gametes produced by the same individual
  • Diecious: male and female gametes are produced by different individuals
  • Homothallic: gametes from one individual can fuse (self-fertile)
  • Heterothallic gametes from one individual cannot fuse (self-sterile)
the life cycles in algae

Three different types of life cycle, depending on when miosis occurs, the type of cells produced, and if there is more than one free-living stage present in the life-cycle.

The life cycles in algae
the life cycles in algae64
The life cycles in algae
  • Life-cycle I (haploid life cycle): major part of life-cycle (vegetative phase) in haploid state, with meiosis upon germination of the zygote (zygotic meiosis) also referred to as haplontic life cycle, a single, predominant haploid phase
the life cycles in algae65
The life cycles in algae
  • Life-cycle II (Diploid life cycle): vegetative phase is diploid, with meiosis upon formation of gametes (gametic meiosis) also referred to as diplontic life cycle, a single, predominant diploid phase
the life cycles in algae66

Life-cycle III (Diplobiontic life cycle):three multicellular phases, the gametophyte and one or more sporophyte(s)

  • Gametophyte: typically haploid, produces gametes by mitosisSporophyte: typically diploid, produces spores by meiosisIsomorphic: sporophyte and gametophyte look alikeHeteromorphic: sporo- and gametophyte look different
The life cycles in algae
basis of algal classification
Basis of algal Classification
  • the different groups of algae can be classified on the basis of a number of characteristics.

1. Color has been an important means of classifying algae, and gives many groups their names. However, other characteristics, such as type of photosynthetic food reserve, flagella type, cell wall structure and composition, and life history, have been important in further distinguishing the algal divisions.

flagella
Flagella

Locomotion in algae is largely based on the action of flagella. The figure below illustrates the wide variety of flagella present in the algae. The primary distinctions used for classification are the number of flagella, their location on the cell, and their morphology. Two major types of flagella are recognized: the smooth, or acronematic, and the hairy, or pleuronematic, types. The smooth flagella generally moves by whiplash motion and the hairy flagella moves by a pulling motion.

ecological diversity
ECOLOGICAL DIVERSITY
  • LAND---WATER
  • FRESH WATER---MARINE HABITATS
  • FLOATING (PLANKTONIC)—BENTHIC (BOTTOM DWELLERS)
  • EPIPHYTES