Dana clark

Page 1

TAURANGA MOANA BROADSCALE SURVEY MTM TEAM

JULY 2014


SURVEY DESIGN

Dec 2011 - Feb 2012


SUBSTRATE TYPE •  Mainly sand •  Similar mud content to other NZ estuaries •  Te Puna & Apata have higher sedimentation


NUTRIENTS

Typical of slightly to moderately enriched estuaries


METALS

•  All sites well within guidelines for the protection of marine life •  Te Puna had relatively high levels compared to the rest of the harbour


MARINE ANIMALS AS INDICATORS OF HEALTH •

Physical variables are useful indicators of health

Animals living within the sediment are exposed to multiple stressors

Provide integrated assessment of overall health


DEVELOPING BENTHIC HEALTH MODELS Step 1: Determine the key anthropogenic stressors •  •  •

Sedimentation (silt/clay) Nutrients (TP, Chl a) Contaminants (Cu, Pb)

Step 2: Relate gradient to marine animals


SEDIMENTATION


NUTRIENTS


CONTAMINANTS


KEY SPECIES Model Sedimenta*on Nutrients Contaminants

Associa+on Low mud High mud Nega*ve Posi*ve Nega*ve Posi*ve

Species Scoloplos cylindrifer Scolelepis sp. Halopyrgus pupoides Oligochaeta Scolecolepides benhami Heteromastus filiformis Arthri9ca bifurca Nereidae Scolelepis sp. Scolecolepides benhami Heteromastus filiformis Amphipoda indeterminata Orbinia papillosa Scolecolepides benhami Heteromastus filiformis Arthri9ca bifurca Amphipoda indeterminata

Faunal Group Orbinid polychaete Spionid polychaete Gastropod Oligochaete Spionid polychaete Capitellid polychaete Bivalve (deposit feeding) Nereid polychaete Spionid polychaete Spionid polychaete Capitellid polychaete Amphipod Orbinid polychaete Spionid polychaete Capitellid polychaete Bivalve (deposit feeding) Amphipod

Feeding mode D (surface / sub-­‐surface) D (surface) Microalgal and detrital grazer D D (surface deposit) D (sub-­‐surface deposit) D P D (surface) D (surface deposit) D (sub-­‐surface deposit) D D (surface deposit) D (sub-­‐surface deposit) D


10

15

20

5

10

15

20

Nut Nucula shells hartvigiana

8

p = 0.0056

10 20 30 40

Heteromastus filiformis p < 0.001

10

15

20

5

10

10

Orbinia papillosa

15

20

% mud

20

5

30

0

p < 0.001

Scolecolepides benhami

20

5

10

p > 0.1

15

Nucula hartvigiana

4 6 8 10

2

3

% mud

Oligochaeta

20

0.2 0.4 0.6 0.8

15

4

10

14

5

p < 0.001

5

1

sity, number per core

0

10 20 30 40 50

2 0

No. per core

4

6

p < 0.001

Austrovenus stutchburyi Cockles

No. per core

density, number per core

Macomona liliana

0.00 0.05 0.10 0.15 0.20

5

SPECIES RESPONSE CURVES - SEDIMENTATION


SPECIES RESPONSE CURVES - SEDIMENTATION

No. per core

Nereididae

ln (% mud)


OUTCOMES

Community based models of health of the harbour

Science and cultural indicators for long term monitoring

Species specific response curves for key species


CONTRIBUTORS •  •  •  •  •  •  •  •  •  •  •  •  •  •

Local iwi Aaron McCallion (Waka Digital) Alice Morrison (Bay of Plenty RC Summer Student) Bruce Gardner (Bay of Plenty Regional Council) Caine Taiapa (Manaaki Te Awanui) Cawthron Lab ID team Chris Battershill (University of Waikato) David Culliford (Bay of Plenty RC Summer Student) Derrylea Hardy (Massey University) Erin Brown (Waka Digital) Lydia Hale (Manaaki Te Awanui) Murray Patterson (Massey University) Nicole Hancock (University of Waikato) Stephen Park (Bay of Plenty Regional Council) …plus all the other volunteers that helped!


Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.