changes in aquatic invertebrate community diversity during supra-seasonal drought conditions
DESCRIPTION
Changes in Aquatic Invertebrate Community Diversity during Supra-Seasonal Drought Conditions. By Briana Albini University of Hawaii at Hilo Mentor: Ayesha Burdett New Mexico Museum of Natural History and Science. Droughts. Seasonal droughts Occur periodically/ seasonally. - PowerPoint PPT PresentationTRANSCRIPT
Changes in Aquatic Invertebrate Community Diversity during Supra-Seasonal Drought Conditions
By Briana AlbiniUniversity of Hawaii at HiloMentor: Ayesha BurdettNew Mexico Museum of Natural History and Science
DroughtsSeasonal
droughts◦ Occur
periodically/ seasonally
Supra-seasonal droughts◦ Random & longer
than normal seasonal conditions
◦ Considered a ramp disturbance Due to increase of
disturbance over time
Drought Conditions of NM
Drought Conditions of NM
InvertebratesInverts evolved
adaptations to seasonal drought
Extreme conditions produced by supra-seasonal drought may be too much for invertebrates to handle
Diptera Chironomidae
Hemiptera Corixidae
Water and droughtIncrease in
temperature, nutrient and chemical loads
Decrease in D.O., surface area and volume of water body
• Lotic and lentic habitat ratio change
• Refugia can be pockets of standing water
Past Study on InvertebratesStudied
differences in invertebrate composition in drinkers & springs
Using data from 2010
QuestionsIs there a
difference between the diversity levels of invertebrate communities in the springs and drinkers due to drought conditions between 2010 and 2013?
Additional Questions:◦ Can drinkers be
considered refugia?
◦ Do some inverts stay dormant in dried sediments until area is wet again?
MethodsExperiment was conducted on
Sevilleta National Wildlife Refuge
Wet SitesCollection of
aquatic invertebrates ◦Left sponges in
water sources for 10 days
◦Took a 15x15cm quadrate sample from bottom of water source
Dry SitesTotal of 3 dry
sites◦Rio Salado◦Bronco◦Cibola
Collection of sediment samples◦Took top soil or
sediment from drinkers or springs
Methods – Lab Analysis
Wet Sites Lab Methods Dry Sites Lab Methods
Separate invertebrates from sediment
Identify & count amount of each taxa
Place sediment into clear containers & add water
After 10 days, go through sample to see what emerges
Identify any emergent taxa
Methods – Vegetation & Scat SurveySame methods for
both surveys4 transects going
in cardinal directions
Each transect is 50 m
10 - 1 m quadrates spaced 5 m apart◦Surveyed for %
coverage of vegetation and scat
Results
Taxonomic Richness (S)0
2
4
6
8
10
12
Taxonomic Richness for Wet SitesCanyonEsquivalSan Lorenzo W. W. Mesa E.Goat DrawSan Lorenzo E.W. Mesa S. McKenzieTule (222)NunnGibbs
# o
f Taxa
Total abundance0
200
400
600
800
1000
1200
1400
1600
Total Abundance for Wet Sites
CanyonEsquivalSan Lorenzo W.W. Mesa E.Goat DrawSan Lorenzo E. W. Mesa S.McKenzieTule (222)NunnGibbs#
of
Invert
ebra
tes
Ostracoda
Results
0 0.5 1 1.5 2 2.5 3 3.5 4 4.50
2
4
6
8
10
12
f(x) = − 0.522233638793134 x + 5.06270455928802R² = 0.0353028842694666
Animal Use vs Richness
Mean % Scat
Taxonom
ic R
ichness (
S)
15 20 25 30 35 40 45 500
2
4
6
8
10
12
f(x) = 0.253302530964599 x − 2.84628004990635R² = 0.353645657729198
Vegetation vs Richness
Mean % Vegetation
Taxonom
ic R
ichness
(S)
No correlation
Positive correlation
Results for Dry SamplesNo emergent
taxa found May indicate that
the environment is too harsh to keep ‘seedbanks’
Results
Bronc
o '1
0
Bronc
o '1
3
Canyo
n '1
0
Canyo
n '1
3
Gibbs
'10
Gibbs
'13
Goat D
raw '1
0
Goat D
raw '1
3
McKen
zie
'10
McKen
zie
'13
Tule
222
'10
Tule
222
'13
Wes
t Mes
a '1
0
Wes
t Mes
a'13
San
Lore
nzo
E. '1
0
San
Lore
nzo
E. '1
3
Cibol
a '1
0
Cibol
a '1
30
2
4
6
8
10
12
Change in Diversity between 2010 & 2013
Dytiscidae (Col) Uvarus (Col, Dyt) Tenebrionidae (Col) Laccophilius (Col, Dyt)
Hydrochus (Col, Hydr) Hydrophilidae (Col) Hydrocolus (Col, Dys-Hydro) Derallus (Col, Hydr)
Curculionidae (Col) Carabidae (Col) Diptera Culicidae (Dipt)
Chironominae (Dipt, Chird) Ceratopogonidae (Dipt) Ephydridae (Dipt) Simuliidae(Dipt)
Tanypodinae (Dipt, Chird) Sciomyzidae (Dipt) Stratiomyidae (Dipt) Caloparyphus (Dipt, Strat)
Euparyphus (Dipt, Strat) Hemiptera Notonectidae (Hem) Notonecta Linnaeus (Hem, Not)
Coricidae (Hem) Corixidae (Hem) Corixinae (Hem, Corixidae) Corisella (Hem, Corix)
Trichorixa (Hem, Corix) Veliidae (Hem) Baetisca (Eph, Baet) Physa (Gast, Phys)
Trichoptera Cyclopoida (Cop) Ostracoda Hydrachna (Trom, Hyd)
Drinkers and Springs
# o
f Taxa
Results
t-Test: Paired Two Sample for Means
2010 2013
Mean 3.714 3.428
Variance 8.238 12.285
P(T<=t) two-tail 0.818
t Critical two-tail 2.446
2010 20130
5
10
15
20
25
30
Taxa Richness
Taxa Richness
Turnover
Bronco 2010 S=3
Bronco 2013 S=0
Total Species
Pool
0
3
0
3
San Lorenzo E. 2010
S=7
San Lorenzo E. 2013
S=11
Total Species
Pool
0
7
11
7
Goat Draw 2010 S=1
Goat Draw 2013 S=2
Total Species
Pool
1
1
1
0
McKenzie 2010 S=1
McKenzie 2013 S=2
Total Species
Pool
1
1
1
0
Cibola 2010 S=10
Cibola 2013 S=0
Total Species
Pool
0
10
0
10
TurnoverCanyon
2010 S=6
Canyon 2013 S=1
Total Species
Pool
0
6
1
6
Gibbs 2010 S=1
Gibbs 2013 S=1
Total Species
Pool
0
1
1
1
Tule 222 2010 S=7
Tule 222 2013 S=3
Total Species
Pool
1
7
2
6
West Mesa 2010 S=3
West Mesa 2013 S=4
Total Species
Pool
1
3
3
2
DiscussionThere is no difference in taxa
richness between 2010 and 2013Not enough springs to answer
refugia questionDry springs have no invertebrate
‘seedbanks’
Improvements?More springs to compare to
drinkers◦Need wetter conditions◦Couldn’t look into refugia question
Switch methods ◦Sponge removed and quadrate
sample taken on same dayAbundance numbers from past
study
Future StudyResample wet
drinkers and springs ◦Use additional
points to see how turnover changes
◦How diversity of drinkers and springs change
AcknowledgementThank you all very much!
◦NSF, Sevilleta LTER Program and the US Fish & Wildlife
◦Research Mentor: Ayesha Burdett◦Past Data: Amanda Martinez & Scott Collins◦Field Partner: Brennan Davis◦Sevilleta Coordinator: Amaris Swann◦Becky Bixby (UNM) & Bob Verb (ONU)◦And to everyone else who helped &
supported me this summer!
QUESTIONS????
Thank You!!!
Trombidiformes Hydrachnidae Hydrachna