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2019 SOUTHEASTERN NATURALIST 18(2):314–320
Diversity of Haemosporidian Parasites in Mississippi
Songbirds
Haley N. Bodden1 and Diana C. Outlaw1,*
Abstract - Haemosporidian parasites are extremely diverse in birds. The more bird hosts that
are tested, the greater the diversity of haemosporidians that is found. Here, we conducted
a survey of haemosporidians in the local populations (Oktibbeha County, MS) of common
and abundant songbirds. We captured local songbirds with mist nets and collected blood
samples from the brachial vein for screening and identification of haemosporidians. Parasite
prevalence was 57%, and we detected 3 genera of haemosporidians. We documented 3
Haemoproteus lineages, with 1 novel lineage (3% different than any known lineage); 2 Leucocytozoon
lineages were found, neither of which were novel; and 8 Plasmodium lineages
were found, one of which was novel (5% different than any known lineage), and 1 of which
that may be novel (3% different than any known lineage). We detected Leucocytozoon for
the first time in Mississippi songbirds, indicating the importance of surveying for understanding
putative haemosporidian range shifts.
Introduction
Avian malaria has been linked to the huge decline of bird populations in some
areas, even leading in some instances to near extinction (Atkinson 2008). Over the
evolutionary history of malaria (haemosporidian) parasites, they have spread to
over 10,000 avian species, with new haemosporidians being discovered frequently
(Daszak et al. 2000, Ricklefs et al. 2014). Climate change has created an opportunity
for these parasites to expand to parts of the world they have never been before,
primarily due to the distributional changes in the dipertan vectors (see Loiseau et
al. 2012, Marzal et al. 2014, Sehgal 2015). Studies have shown how invasive certain
species of haemosporidians can be, and how detrimental these parasites are to
bird populations (Marzal et al. 2015). The International Union for Conservation of
Nature has listed the avian malaria parasite Plasmodium relictum Gilmruth, Sweet,
and Dodd in the top 100 worst invasive species in the world.
Avian malaria prevalence can vary drastically in different regions (Lauron et al.
2015, Martinsen et al. 2016, Walther et al. 2015), with bird migration increasing the
possibility of parasite transmission and potential host switches (Dodge et al. 2013,
Ricklefs et al. 2017). More than 325 bird species migrate annually on the Mississippi
Flyway and there are numerous permanent residents (Mississippi Chapter,
National Audubon Society 2019); thus, the potential for parasite transmission is
relevant in this area.
We conducted a survey of the haemosporidians in local bird populations
over the course of 1 year in order to preliminarily assess the diversity of avian
1Department of Biological Sciences, Mississippi State University, PO Box GY, Mississippi
State, MS 39762. *Corresponding author - doutlaw@biology.msstate.edu.
Manuscript Editor: Frank Moore
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haemosporidians across multiple, common bird species. We know from previous
studies that there is a large number of local birds infected with haemosporidians
(Fast et al. 2016, Walstrom and Outlaw 2017). This survey has allowed us to expand
our knowledge of infection in a wider range of local passerines.
Methods
Field work
We used mist nets to capture passerines in Starkville, MS, from January 2017
until January 2018. The 3 netting locations are listed in Table 1; we conducted most
netting 3–4 d per week, either in the late morning or late afternoon, depending on
the availability of student help. We captured 8 passerine species: Cardinalis cardinalis
(Northern Cardinal), Baeolophus bicolor (Tufted Titmouse), Carpodacus
mexicanus (House Finch), Poecile carolinensis (Carolina Chickadee), Thryothorus
ludovicianus (Carolina Wren), Toxostoma rufum (Brown Thrasher), Setophaga
petechia (Yellow Warbler), and Troglodytes aedon (House Wren), for a total of 68
birds. We collected blood samples via brachial venipuncture and stored them at
-20 °C in RNAlater (Sigma-Aldrich Company, St. Louis, MO). The sample size
was limited because ours was a 1-year project involving multiple undergraduate
students and funding was limited.
DNA extraction and parasite detection
We extracted genomic DNA from the blood samples using the DNeasy Blood
and Tissue kit (QIAGEN, Inc., Germantown, MD.). We employed the DNeasy
protocol “Purification of Total DNA from Animal Blood or Cells” for the nucleated
avian blood samples. We detected haemosporidian parasites from the extracted
DNA by amplification of the parasite’s mitochondrial cytochrome b (cyt b) gene
via the polymerase chain reaction (PCR). We conducted a nested PCR that amplified
a specific segment of the parasite’s cyt b gene. The initial PCR used the
primers HaemNF1 and HaemNR3 (Hellgren et al. 2004) and amplified Plasmodium,
Parahaemoproteus, and Haemoproteus species. We then ran a nested PCR
using the Haem PCR as the template. The second set of primers comprised UNIVF
and UNIVR1 (Drovetski et al. 2014); these primers amplified the above genera and
Leucocytozoon. We performed the initial and nested reactions with the same volume
of each reagent the same final volume. The master mix consisted of 2.5 μl Ex Taq
Buffer, 2.0 μl dNTP mixture, 0.5 μl BSA, 0.5 μl of each primer, 0.125 μl Ex Taq,
1.0 μl of the DNA template, and 17.875 μl of DI water for each reaction. We used
24 μl of the master mix along with 1μl of the DNA (for the initial PCR) or 1 μl of
the initial reaction (for the nested PCR) in each sample. We ran the initial reaction
Table 1. Netting locations.
Netting location Locality GPS coordinates (°N, °W)
South Farm Research Area Starkville, MS 33.420806, 88.783042
Mississippi State University Starkville, MS 33.454135, 88.783455
Critz Street, Starkville MS Starkville, MS 33.471369, 88.811081
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in a thermal cycler under the following conditions: 3 min at 94 °C, 35 cycles of 30
sec at 94 °C, 30 sec at 55 °C, 45 min at 72 °C, 10 min at 72 °C, and a hold at 4 °C.
We ran nested reactions in a thermal cycler for 3 min at 94 °C, 41 cycles at 94 °C
for 30 sec, 30 sec at 52 °C, 45 sec at 72 °C, 10 min at 72 °C, and held at 4 °C.
We visualized the PCRs on a 1% agarose gel via electrophoresis. We used the
QIAquick PCR Purification kit (QIAGEN) to clean the positive samples to prepare
for sequencing. We sent the cleaned PCR products to the Arizona State University
DNA lab (Phoenix, AZ) for sanger sequencing of the forward and reverse strands
on an Applied Biosystems 3730 capillary sequencer (ThermoFisher Scientific,
Carlsbad, CA).
Genus determination
Once the sequences were received, we made a consensus sequence by aligning
the forward and reverse strands using Sequencher V.5.4.6. We used the NCBI Basic
Local Alignment Service Tool (BLAST) to extract either the consensus or the
sequence and determine the parasite lineage.
Genetic lineage identification
We included alignments of this study’s sequences from each genus in a BLAST
search of both NCBI and the MalAvi databases (Bensch et al. 2009). We set a 98%
sequence similarity as a cut-off for species/lineage identification. We reconstructed
phylogenetic trees for each genus for verification of lineage identification (reconstructions
not shown) using the cyt b sequences acquired from this study’s sampling
as well as those from MalAvi sequences that would provide the most diversity in
the phylogeny after an initial inclusion of all known sequences.
We aligned all the sequences and checked for gaps or stop codons in Sequencher
V.5.4.6. We performed a Bayesian analysis in BEAUTi and BEAST using the following
parameters: substitution model = GTR, base frequencies = estimated, clock
model = uncorrelated relaxed clock, site heterogeneity model = Gamma + invariant
sites, and tree prior-yule process (v.1.8.4; Drummond et al. 2012). Log likelihood
stabilization of model parameters was determined in Tracer (v.1.6; Rambaut and
Drummond 2007).
Results
Prevalence
We sampled a total of 68 birds from 3 locations in Starkville, MS. We
sampled 8 passerine species: Northern Cardinal (45 sampled, 33 infected),
Tufted Titmouse (8 sampled, 1 infected), Carolina Chickadee (3 sampled, 2 infected),
House Finch (6 sampled, 1 infected), Brown Thrasher (2 sampled, 1
infected), House Wren (1 sampled, 1 infected), Yellow Warbler (2 sampled, 0 infected),
Carolina Wren (1 sampled, 0 infected). We determined, via PCR, that the
overall parasite prevalence in the samples was 57.4% (Table 2).
We detected 3 parasite genera: Plasmodium, Haemoproteus, and Leucocytozoon.
Of the 68 total birds sampled, we found that 47.10% of the infections were caused
by the genus Plasmodium, 8.80% by Haemoproteus, and 2.9% by Leucocytozoon
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(Table 3). Three samples did not sequence well, and we excluded them from the
analysis. All lineages have been deposited in the Dryad Respository under the data
package title “Data from: Diversity of haemosporidian parasites in Mississippi
songbirds” (DOI:10.5061/dryad.8kd1d3f).
Genetic lineage identification
We identified 8 lineages for Plasmodium (Table 4), of which 2 were novel. We
also detected both Plasmodium circumflexum Kikuth and P. juxtnucleare Versiani
and Gomes, as well as what seems to be P. lutzi Lucena. One novel lineage is 95%
similar to an Old World lineage found in Europe. We identified 3 lineages for
Haemoproteus, (Table 4), and one of these is potentially novel (97% similarity to
a known lineage). We identified 2 lineages for Leucocytozoon (Table 4), neither of
which is novel, though neither has previously been found in any songbird.
Discussion
Studies to explore Haemosporidians in Mississippi are recent, but there are several
features in common amongst these studies (Fast et al. 2016, Larson et al. 2017,
Walstrom and Outlaw 2017). The first is that Mississippi seems to harbor unique
parasite lineages that are not found elsewhere. The second is that Mississippi is
home to a diverse array of parasites that seemingly come from its prominent position
along the Mississippi flyway, one of the largest pathways of birds migrating
from north to south, annually.
Table 3. Parasite prevalence by haemosporidian genus.
Plasmodium Haemoproteus Leucocytozoon
Northern Cardinal 28 5 1
Tufted Titmouse 0 0 1
Carolina Chickadee 2 0 0
House Finch 1 0 0
Brown Thrasher 0 1 0
House Wren 1 0 0
Total prevalence % 47.10% 8.80% 2.90%
Table 2. Parasite prevalence.
Number Number
Species collected infected Prevalence
Cardinalis cardinalis L. (Northern Cardinal) 45 33 73%
Baeolophus bicolor L. (Tufted Titmouse) 8 1 13%
Poecile carolinensis (Audubon) (Carolina Chickadee) 3 2 67%
Carpodacus mexicanus (Müller) (House Finch) 6 1 17%
Toxostoma rufum (L.) (Brown Thrasher) 2 1 50%
Troglodytes aedon (Vieillot) (House Wren) 1 1 100%
Setophaga petechia (L.) (Yellow Warbler) 2 0 0%
Thryothorus ludovicianus (Latham) (Carolina Wren) 1 0 0%
Total 68 39 57%
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The diversity of Plasmodium parasites we detected is not surprising and is entirely
consistent with the previous studies mentioned above, but our detection of 2
Leucocytozoon parasites in songbirds was unexpected. We conducted a survey of
waterfowl and detected Leucocytozoon in Aythya affinis (Eyton) (Lesser Scaup) and
Phalacrocorax auratus (Lesson), (Double Crested Cormorant) (data not shown).
These 2 “infections” may simply be the result of spillover and may not represent viable
infections. Our findings do suggest, however, that the vectors of these parasites
are taking advantage of multiple bloodmeals, an issue we are currently addressing
with research projects involving Simuliidae (blackflies) and Culicinae and Anophelinae
(mosquitoes).
Surveys of local haemosporidians are crucial in monitoring efforts. Haemosporidians
are expanding their geographic range and acquiring new hosts in new areas,
particularly along migratory pathways (Ricklefs et al. 2017). This information reinforces
that our knowledge of the diversity in haemosporidians remains extremely
limited (see also Valikunas 2005).
Future directions
One result from comparing 2 previous projects on Northern Cardinals and Tufted
Titmice (Fast et al. 2016, Walstrom and Outlaw 2017), was the difference between
which parasites infected each host species. Plasmodium seemed to prefer Tufted
Titmice to Northern Cardinals and Parahaemoproteus seemed to prefer Northern
Cardinals. The samples from this study, combined with our previously collected
samples, will allow us to conduct natural differential gene expression experiments
between host species to compare the immune responses to different hosts to both
the same and different parasites.
Table 4. Parasite lineage identification. Putative novel lineages are noted with an asterisk ( *).
Number of Species (if known) and/or
Lineage times found % similarity to MalAvi Lineage (name)
Haemoproteus
H1 4 98–100 (SIAMEX01)
H2 1 99
H3* 1 97
Leucocytozoon
L1 1 100 (AIXGAL01)
L2 1 98
Plasmodium
P1 2 Plasmodium circumflexum/98–99
P2 4 100 (FIPAR01)
P3 7 98–100 (TRICRI01)
P4 7 P. juxtanucleare/99–100
P5 3 P. lutzi
P6 1 98
P7* 1 95
P8* 1 97
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Acknowledgments
Funding for the project was provided by the National Institutes of Health R03AI117223-
01A1 to D.C. Outlaw. We assert that all procedures contributing to this work complied with
the ethical standards of the relevant national and institutional guides on the care and use of
laboratory animals. Birds were mist-netted and released under both United States Federal
(MB6214) and Mississippi State University collecting permits to D.C. Outlaw, and under
MSU’s Institutional Animal Care and Use Committee (IACUC).
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