Life in local streams?

Transcription

1 Life in local streams?

2 Hamilton City >120 km of mapped gully stream Many seepages

3 Mangakotukutuku

4 Other urban sites Gibbons Te Awa O Katapaki Hospital stream Bankwood

5 Freshwater fish Over 40 native freshwater species Around 21 introduced species Many native species migrate (e.g., whitebait) Some are long-lived eels can live >80 years Eat invertebrates terrestrial and aquatic Lay eggs sometimes outside the stream Stephen Moore, Landcare Research

6 Number of sites Fish in Hamilton streams Non-threatened native species 5 spp Threatened native species 4 spp Introduced species 4 spp Common bully Redfin bully 5 0

7 Bruno David, WRC The baddies

8 Longfin eel THREATENED animal.discovery.com

9 Giant kokopu THREATENED Stephen Moore, Landcare Research

10 Inanga - whitebait Inanga Banded kokopu Torrentfish Common bully Torrentfish Torrentfish THREATENED THREATENED (Photos: Stephen Moore, Landcare Research) Stephen Moore, Landcare Research

11 Torrentfish THREATENED Stephen Moore, Landcare Research

12 THREATENED Koura Stephen Moore, Landcare Research

13 Black mudfish THREATENED Photo Nick Ling

14 Common bully Banded kokopu Redfin bully Smelt Redfin bully (Photos: Stephen Moore, Landcare Research)

15 Fish sampling Electric fishing B.Hicks, University of Waikato B.Hicks, University of Waikato Spot-lighting Fyke netting Minnow trapping

16 Mangakotukutuku trib. Stephen Moore, Landcare Research B.Hicks, University of Waikato Stephen Moore, Landcare Research Stephen Moore, Landcare Research Stephen Moore, Landcare Research Stephen Moore, Landcare Research Stephen Moore, Landcare Research Stephen Moore, Landcare Research Stephen Moore, Landcare Research

17 EELS INANGA Autumn Late summer - Autumn Spring Spring terra.govt.nz

18 Fish migration Diagram courtesy of Cindy Baker, NIWA Eggs Stephen Moore, Landcare Research

19 Distance travelled 5,000 km Eels Inanga Banded kokopu Distance travelled > 110 km Hamilton

20 Banded kokopu Giant kokopu Inanga Hamilton

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22 The food pyramid Eels B. David, WRC Small fish S. Moore, Landcare Research Big invertebrates S. Moore, Landcare Research Small invertebrates S. Moore, Landcare Research Algae, leaves etc

23 Stream insects B. Smith, NIWA

24 Seeps and springs are important disconnected from stormwater network 30% of mayfly and caddisfly species from McCraw 2011 uncommon, iconic and even new invertebrate species

25 Oxyethira kirikiriroa B. Smith, NIWA Giant bush dragonfly T.Wilding, NIWA

26 Sensitive invertebrates Stephen Moore, Landcare Research

27 Tolerant invertebrates Stephen Moore, Landcare Research

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29 Stormwater Storm runoff can occur 10 times more often Typical large floods can occur 3 times more often Temperatures can be around 6 o C warmer

30 Channelisation

31 Historical legacies such as old landfills

32 Water quality Keep chemicals out of drains Clean cars on the grass Keep rubbish out of the gully/stream Paint roofs Disconnect downpipes if roof-cleaning etc

33 Restore fish passage

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35 Enhance habitat

36 Weight (g) Length (mm) Re-introduce fish (a) Parana Park (P1) Chartwell Park (K11) Mangaiti Park (K10b) Mangakotukutuku (M11) K11 P1 Average M11 K10b Jan Mar Apr Jun Aug Sep Nov Jan Time 2007 (b) 30 P Average 15 K11 M11 K10b Giant kokopu B. Bartells, NIWA Jan Mar Apr Jun Aug Sep Nov Jan Time 2007

37 Riparian planting