Freshwater Fish (lecture 3a) Flashcards Preview

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Flashcards in Freshwater Fish (lecture 3a) Deck (13):
1

global extinction crisis

-freshwater ecosystems most threatened
due to reliance and alterance of freshwater

-1 million dams globally and at least 50% of freshwater runoff captured has greatly altered freshwater

-25% of evaluated freshwater fish is considered threatened

-freshwater ecosystems represent the ultimate conservation challenge
-impacted by everything upstream, downstream, and around the areas

2

Kimberley Region

-pristine
-rugged
-biodiverse
-high degree of endemism
-refuge for many species
-northwest region of Australia
-highly diverse species

3

Kimberly freshwater fish

-49 species recorded
-18 described regionally endemic fish species
-few fish surveys in the region
-little ecological info available for Kimberley endemic fish species

4

congeneric pairs

-species of the same genus in abundance in one area and in sectors in another

-ex. rainbowfish, grunters

model system
7 genera w/widespread-endemic species pairing

5

Potential threats to Kimberly Freshwater ecosystem

-potential large scale dam
-minning(largest diamond mind in the Kimberley)
-invasive species(cane toads, telopea, red claw lobster, future impacts from climate change(increase water temp )

6

characteristics of the fish fauna of the Kimberley

undergo collection data

7

collection fish data

electrofisher-device sends strong electric current through the water

huck and line

gill net-along the edge of water holes

snorkeling

fyke net-deep water


video-deep water

8

Broad scale conservation ecology of Australian freshwater fish

look at body size, range size, relative abundance and conservation status

small body size, small or large geop

9

Triple jeopardy

range size, abundance, and specialization

10

Triple jeopardy extinction risk in Kimberley freshwater fishes

-range size
-abundance
-specialization
-diet
-habitat
-life history
-physiology

ex. rainbowfish and grunter

11

rainbowfish

-has single jeopardy
-slender rainbowfish has restricted range but has a similar diet to the widespread one and is more abundant

12

grunter

-has triple jeopardy
-slender nose grunter has restricted range, is 6x less abundant, and has stricted diet

13

conclusion

-many unlisted species that may require listing across northern Australia, especially in the Kimberley

-potential for triple jeopardy risk in some Kimberly fish
(like the slender nose grunter)

-opportunities for proactive conservation in the Kimberley's rivers