SlideShare a Scribd company logo
1 of 13
Download to read offline
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 1
Dyreliv i ferskvatn og vassdrag.
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 2
Ferskvatn som økosystem
Biotiske faktorar? Abiotiske faktorar?
Insekt
Planter
Fisk
Larve
Snegler
Sommarfuglar
Dyr
Vannlilje
Mennesker
Trer
Sjøgras
Øyenstikkarlarvar
Stein
Djupna
Vatn
Temperatur
Veret
Årstida
Sand
Sollys
Fall i elva ­ straum
Lufta
Klima
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 3
Korleis kan me dele inn dei biotiske 
faktorane?
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 4
Blodigle
• Dei er tokjønna ­ hermafroditter
• 10­15 cm lang
• rovdyr eller blodsugarar
• Brukt av legar til å sikre 
blodstraumeni f.eks påsydde 
fingrar
• Sugekopp i begge endar, størst 
bak
• raude lengdestriper på ryggen
Hesteigle
• 10­15 cm lang
• alminneleg i Sør­Noreg
• både rennande og stilleståande 
vatn
• lever av sniglar, larvar og andre 
dyr
• Syg ikkje blod
• Sugekopp i begge endar, størst 
bak
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 5
Steinfluge­larvar
• har to haletrådar
• lange følehorn
• langstragt kropp
• kraftige bein
• dei store larvane har vingeanlegg
• trivst i hurtigrennande vatn
• opptil 25 mm
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 6
Døgnflugelarvar
• opptil 25 mm
• tre haletrådar
• larvane lever i vatn, 
døgnflugene på land
• gjeller langs sida
• lever kort tid, frå nokre timar 
til nokre dagar
• viktig mat for fisk
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 7
Augestikkerlarvar og 
vannnymfe­larvar
• opptil 35 mm
• berre larvane leve i vatn
• har gjelle­blad på bakkroppen
• grådige rovdyr
• kalla vann­nymfer
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 8
TEGER:
Vannløper
• opptil 17 mm
• på overflata av stilleståande­ 
eller langsomtrennande vatn
• rovdyr
• larvane liknar dei vaksne
Ryggsvømmer
• 15 mm lang
• svømme med buken opp
• kan ta store byttedyr som 
småfisk
• kraftig svømmar
Buksvømmar
• 15 mm lang
• tar berre små byttedyr
• i stilleståande vatn
Vannskorpion
• kan bli 20 mm lang
• på leirbotn nær elvebredda
• svømme dårleg
• druknar om han ikkje av og 
til kan krype til overflata og 
puste
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 9
Vårflugelarvar
• dei fleste omgir seg med eit rør
• kan bli opp mot 30 mm
• planteetarar
• nokre lever fritt og er rovdyr
• 192 artar i Noreg
• Vårfluger vert frå 10­30 mm
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 10
Biller eller vannkalv
• stor vannkalv kan bli 35 mm lang
• larvane opp mot 70 mm
• hentar ny luft ved å stikke 
bakparten over vatn, samlar lufta 
under dekkvengene
• dei fleste leve i vatn både som 
larve og som voksen medan 
puppestadiet er på land
• grådige rovdyr som et småfisk
• kan leve i fleire år 
• trivst i planterike dammar
• Brukar begge bakbeina samtidig 
når han skal svømme
• 273 artar i Noreg
Vannkjær
• kan bli 40 mm lange
• hentar ny luft ved hjelp av 
følehorna og samlar den under 
kroppen
• svømme ved å bruke bakbeina 
vekselvis
Virvler
• larven vert 15 mm, eit vakse 
individ 5 mm
• det vaksne individet svømmer 
raskt rundt i ring på vassoverflata
• dei kan og dukke
• larvane lever på botnen
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 11
Vannmidd
• uledda kropp
• fire par bein
Vassedderkopp
• 12­18 mm lange
• spinn ei dykkarklokke 
mellom vassplantene som 
han fyller med luft
• kroppen er alltid omgitt av 
luft
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 12
Ferskvassmusling
• lever av plankton
Sneglar
• gjellesneglane har eit lokk 
som sit fast på bakkroppen 
og som dei kan lukke 
opningen i sneglehuset 
med
• lungesneglane mangler 
dette lokket
Dyreliv i ferskvatn og vassdrag.notebook
Eksportert fra notebook 13

More Related Content

Featured

Social Media Marketing Trends 2024 // The Global Indie Insights
Social Media Marketing Trends 2024 // The Global Indie InsightsSocial Media Marketing Trends 2024 // The Global Indie Insights
Social Media Marketing Trends 2024 // The Global Indie Insights
Kurio // The Social Media Age(ncy)
 
Good Stuff Happens in 1:1 Meetings: Why you need them and how to do them well
Good Stuff Happens in 1:1 Meetings: Why you need them and how to do them wellGood Stuff Happens in 1:1 Meetings: Why you need them and how to do them well
Good Stuff Happens in 1:1 Meetings: Why you need them and how to do them well
Saba Software
 
Introduction to C Programming Language
Introduction to C Programming LanguageIntroduction to C Programming Language
Introduction to C Programming Language
Simplilearn
 

Featured (20)

How to Prepare For a Successful Job Search for 2024
How to Prepare For a Successful Job Search for 2024How to Prepare For a Successful Job Search for 2024
How to Prepare For a Successful Job Search for 2024
 
Social Media Marketing Trends 2024 // The Global Indie Insights
Social Media Marketing Trends 2024 // The Global Indie InsightsSocial Media Marketing Trends 2024 // The Global Indie Insights
Social Media Marketing Trends 2024 // The Global Indie Insights
 
Trends In Paid Search: Navigating The Digital Landscape In 2024
Trends In Paid Search: Navigating The Digital Landscape In 2024Trends In Paid Search: Navigating The Digital Landscape In 2024
Trends In Paid Search: Navigating The Digital Landscape In 2024
 
5 Public speaking tips from TED - Visualized summary
5 Public speaking tips from TED - Visualized summary5 Public speaking tips from TED - Visualized summary
5 Public speaking tips from TED - Visualized summary
 
ChatGPT and the Future of Work - Clark Boyd
ChatGPT and the Future of Work - Clark Boyd ChatGPT and the Future of Work - Clark Boyd
ChatGPT and the Future of Work - Clark Boyd
 
Getting into the tech field. what next
Getting into the tech field. what next Getting into the tech field. what next
Getting into the tech field. what next
 
Google's Just Not That Into You: Understanding Core Updates & Search Intent
Google's Just Not That Into You: Understanding Core Updates & Search IntentGoogle's Just Not That Into You: Understanding Core Updates & Search Intent
Google's Just Not That Into You: Understanding Core Updates & Search Intent
 
How to have difficult conversations
How to have difficult conversations How to have difficult conversations
How to have difficult conversations
 
Introduction to Data Science
Introduction to Data ScienceIntroduction to Data Science
Introduction to Data Science
 
Time Management & Productivity - Best Practices
Time Management & Productivity -  Best PracticesTime Management & Productivity -  Best Practices
Time Management & Productivity - Best Practices
 
The six step guide to practical project management
The six step guide to practical project managementThe six step guide to practical project management
The six step guide to practical project management
 
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
Beginners Guide to TikTok for Search - Rachel Pearson - We are Tilt __ Bright...
 
Unlocking the Power of ChatGPT and AI in Testing - A Real-World Look, present...
Unlocking the Power of ChatGPT and AI in Testing - A Real-World Look, present...Unlocking the Power of ChatGPT and AI in Testing - A Real-World Look, present...
Unlocking the Power of ChatGPT and AI in Testing - A Real-World Look, present...
 
12 Ways to Increase Your Influence at Work
12 Ways to Increase Your Influence at Work12 Ways to Increase Your Influence at Work
12 Ways to Increase Your Influence at Work
 
ChatGPT webinar slides
ChatGPT webinar slidesChatGPT webinar slides
ChatGPT webinar slides
 
More than Just Lines on a Map: Best Practices for U.S Bike Routes
More than Just Lines on a Map: Best Practices for U.S Bike RoutesMore than Just Lines on a Map: Best Practices for U.S Bike Routes
More than Just Lines on a Map: Best Practices for U.S Bike Routes
 
Ride the Storm: Navigating Through Unstable Periods / Katerina Rudko (Belka G...
Ride the Storm: Navigating Through Unstable Periods / Katerina Rudko (Belka G...Ride the Storm: Navigating Through Unstable Periods / Katerina Rudko (Belka G...
Ride the Storm: Navigating Through Unstable Periods / Katerina Rudko (Belka G...
 
Barbie - Brand Strategy Presentation
Barbie - Brand Strategy PresentationBarbie - Brand Strategy Presentation
Barbie - Brand Strategy Presentation
 
Good Stuff Happens in 1:1 Meetings: Why you need them and how to do them well
Good Stuff Happens in 1:1 Meetings: Why you need them and how to do them wellGood Stuff Happens in 1:1 Meetings: Why you need them and how to do them well
Good Stuff Happens in 1:1 Meetings: Why you need them and how to do them well
 
Introduction to C Programming Language
Introduction to C Programming LanguageIntroduction to C Programming Language
Introduction to C Programming Language
 

Dyreliv i ferskvatn og vassdrag