Arquipelago -‐‑ Life and Marine Sciences
ISSN: 0873-‐‑4704
The crustose red algal genus Peyssonnelia (Peyssonneliales,
Rhodophyta) in the Azores: from five to one species
DANIELA GABRIEL, W.E. SCHMIDT, D.M. KRAYESKY, D.J. HARRIS & S. FREDERICQ
Gabriel, D., W.E. Schmidt, D.M. Krayesky, D.J. Harris & S. Fredericq 2015. The
crustose red algal genus Peyssonnelia (Peyssonneliales, Rhodophyta) in the
Azores: from five to one species. Arquipelago. Life and Marine Sciences 32: 1-9.
The family Peyssonneliaceae comprises a worldwide group of non-calcified to calcified,
crust-forming red algae of great ecological significance. Of the genera currently recognized
in the family, Peyssonnelia has been widely considered to contain the largest number of
species, with five members reported for the Azores. Using rbcL as a molecular marker, we
here report on the taxonomic identity of recent collections of Peyssonneliaceae from the
Azorean islands of São Miguel, Graciosa and Pico, and compare those specimens in a
worldwide context. Only a single Peyssonnelia species, P. squamaria, is confirmed for the
Azorean archipelago, with three different haplotypes. Although the populations in the
Azores are genetically different from those occurring in the Mediterranean, this separation
appears to be relatively recent.
Key words: Biodiversity, haplotypes, North Atlantic, phylogeny, rbcL
D. Gabriel (e-mail: danielalgabriel@gmail.com) & D.J. Harris, Research Center in Biodiversity and Genetic Resources (CIBIO), University of the Azores, PT-9501-801 Ponta
Delgada, Portugal; D.M. Krayesky, Biology Department, Slippery Rock University, Slippery Rock, PA 16057-1326, USA; W. E. Schmidt & S. Fredericq, Department of Biology,
University of Louisiana at Lafayette, Lafayette, LA 70504-3602, USA.
INTRODUCTION
The family Peyssonneliaceae (Denizot, 1968),
recently elevated to ordinal rank (Krayesky et al.
2009), comprises a worldwide group of noncalcified or calcified, crust-forming red algae that
are of great ecological significance (Peña & Barbara 2013). Of the genera currently recognized in
the family, Peyssonnelia (Decaisne, 1841) has
been considered the richest in terms of species
number (Pueschel & Saunders 2009). A combination of vegetative and reproductive characters are
currently used to distinguish species of
Peyssonnelia, such as location and degree of calcification, variations in crust adherence, morphology, anatomy and differences in reproductive
development (Maggs & Irvine 1983). The identification of Peyssonnelia species is challenging,
resulting in a number of species usually underestimated or overestimated (Dixon & Saunders
2013). Comparative morphology and DNA sequence analysis confirm that most species originally reported as belonging in Peyssonnelia in
fact belong to other genera (Fredericq et al. 2014)
within the Peyssonneliales (Krayesky et al. 2009).
Peyssonnelia sensu stricto (following Krayesky
et al. 2009) represents species characterized by a
hypothallus that cuts off additional cells forming
multicellular rhizoids (Krayesky 2007). Recent
studies based on worldwide collections indicate
that species of Peyssonnelia sensu stricto have a
narrow distribution and do not occur in most
ocean basins, for example, the Gulf of Mexico
(Krayesky et al. 2009; Fredericq et al. 2014).
Based on general flora studies, five species of
Peyssonnelia have been reported for the Azores
(Parente 2010): the generitype P. squamaria
((S.G. Gmelin) Decaisne, 1842) described from
Italy; P. rubra ((Greville) J. Agardh, 1851) described from the Ionian Sea, Greece; P. polymor1
Gabriel et al.
pha ((Zanardini) F. Schmitz in Falkenberg, 1879)
described from the Adriatic Sea; P. coriacea
(Feldmann, 1941) described from Tangier, Morocco; and P. rosa-marina (Boudouresque &
Denizot, 1973) described from Port-Cros, Mediterranean France (see Guiry & Guiry 2015). Only
one species of Peyssonnelia, P. squamaria (Fig.
1), was recognized for the Azores by Krayesky
(2007) and Krayesky et al. (2009) after examination of multiple collections.
Using rbcL as a molecular marker, we report on
the taxonomic identity of recent collections of
Peyssonneliaceae from the islands of São Miguel,
Graciosa and Pico in the Azores, and discuss the
connection between the various Azorean haplotypes. The identity of the Azorean specimens is
compared with those of Peyssonnelia sensu stricto in a worldwide context.
Fig. 1. Habit of Peyssonnelia squamaria from the Azores.
MATERIAL AND METHODS
Samples of Peyssonneliaceae were collected in
the Azores and the Mediterranean during low tide
or by snorkeling and SCUBA diving. Samples
were kept in coolers until processed, and then
dried in silica gel. Dried samples were ground
with mortar and pestle, and total DNA was extracted using DNeasy Plant mini Kits (Qiagen
Valencia, CA, USA). All the resulting DNA extracts were deposited in the Seaweed Lab at the
University of Louisiana at Lafayette (ULL).
Chloroplast-encoded rbcL gene sequences were
amplified using PCR primers and protocols described in Lin et al. (2001) and Gabriel et al.
(2010). Resulting PCR products were gel-purified
2
and sequenced in both directions using Bigdye
terminator v 3.1 (Life Technologies Grand Island
NY, USA) on the ABI 3130xl genetic analyzer at
ULL and assembled with Sequencher v. 5.2
(Gene Codes Corporation). Newly acquired sequences, in addition to 14 rbcL sequences downloaded from GenBank, were then manually
aligned in Mega v 5.2.2 (Tamura et al. 2011). The
subsequent alignment was analyzed in Partitionfinder (Lanfear et al. 2012) to determine the best
fitting model of evolution and data partition. The
analysis resulted in the selection of the General
Time Reversible model plus gamma and a proportion of invariable sites applied separately to
each codon position on the basis of the three information criteria, i.e. Akaike information criteri-
Peyssonnelia in the Azores
on with correction (AICc), Akaike information
criterion (AIC) and Bayesian information criterion (BIC). The alignment was analyzed by Maximum likelihood (ML) as implemented by
RAXML v 2.4.4 (Stamatakis 2006) with the
above models and partition scheme with 1000
restarts to find the tree with the lowest likelihood
score and 1000 Bootstrap (BS) replications.
A Bayesian MCMC (Markov Chain Monte
Carlo) was also applied to the aligned dataset
using MrBayes v. 3.2.5 (Huelsenbeck & Ronquist
2001; Ronquist & Huelsenbeck 2003). The
Bayesian analysis consisted of two independent
runs of 5 million generations with sampling every
1,000 generations for a total of 10,002 trees.
Convergence was visualized using Tracer v1.6
(Rambaut & Drummond 2007) and the first 10
percent of the trees of each run was discarded as
the burn-in. The resulting Bayesian Posterior
Probabilities derived from the consensus tree
were mapped on the ML tree. A distance matrix
was also resolved from the branch lengths of the
ML tree using the function cophenetic.phylo of
the APE Package in R (Paradis et al. 2004).
The resulting distance matrix was used to find
species boundaries in a stand-alone version of
Automatic to Barcode Gap Discovery (ABGD).
General Mixed Yule Coalescence (GMYC) model, as implemented by the Splits Package in R
(Fujisawa & Barraclough 2013) with a single
threshold model, was also used to determine species boundaries. The requisite ultrametric tree for
the GMYC analysis was generated in Beast v
1.8.1 (Drummond et al. 2012) using a relaxed
log-normal clock with a constant population coalescent as a prior and the best fitting model and
partition as described above. MCMC Chains were
run for 10 million generations with sampling every 1000th generation resulting in 10,000 trees.
The quality of the run was assessed in Tracer v1.6
(Rambaut & Drummond 2007) to ensure that effective sample size (ESS) values were >200 with
the default burn-in (1,000 trees). Tree annotator v
1.8.1 (Drummond et al. 2012) was used to summarize the resulting 9001 trees after burning, targeting the maximum clade credibility tree with
preserved node heights. A statistical parsimony
method implemented in the TCS 1.21 software
(Clement et al. 2000) was used to infer genealogical relationships among haplotypes. The maximum number of differences resulting from single
substitutions among haplotypes was calculated
with 95% confidence limits, treating gaps as
missing data.
RESULTS
The final dataset was composed of 34 rbcL sequences of Peyssonneliaceae, 20 of which were
newly generated, with 31 sequences representing
hitherto confirmed Peyssonnelia species and three
sequences of Sonderopelta capensis ((Montagne)
Krayesky, 2009) and S. coriacea (Womersley &
Sinkora, 1981) (Table 1). Sonderopelta (Womersley & Sinkora, 1981) was selected as an outgroup
based on previous studies that established the
genus as a sister taxon of Peyssonnelia (Kato et
al. 2006; Krayesky et al. 2009; Dixon & Saunders
2013). [Note: Sonderopelta has been viewed to be
an illegitimate name by Wynne (2011); however,
Sonderophycus (Denizot, 1968) is not a valid
name (Womersley & Sinkora 1981) in agreement
with Article 41.5 of the International Code of
Botanical Nomenclature (2012, Melbourne
Code)].
The results of the ABGD and GMYC analyses
showed the existence of six species of
Peyssonnelia within the dataset: P. replicata
(Kützing, 1847), P. bornetii (Boudouresque &
Denizot, 1973), P. rubra and three closely related
species initially identified as P. squamaria (Fig.
2). All Azorean collections belonged to P. squamaria, along with Mediterranean representatives
from Catalonia (Spain), Sicily (Italy), Malta and
Greece (not shown). Its two sister clades were
only observed in the Mediterranean, and are here
referred to as P. coriacea from Malta and P. polymorpha from Sicily. Sequence JX969797, referred to as P. squamaria by Dixon & Saunders
(2013), corresponds to material of Sicily that has
a unistratose hypothallus layer in contrast to the
2-layered hypothallus of P. squamaria (Boudouresque & Denizot, 1975).
Besides the generitype, four species that are
also true Peyssonnelia were only collected in the
3
Table 1. Summary of specimens included in the present study. Asterisk marks newly generated sequences. Letters within brackets refer to the haplotypes of Peyssonnelia squamaria in Fig. 3.
Extraction
Collection number
Taxa
Locality
Depth
Collection
date
Collector
Accession number
K163
SMG-05-242
Peyssonnelia squamaria (A1)
São Miguel, Azores
intertidal
09-jul-2005
EU349177
K164
SMG-05-152
Peyssonnelia squamaria (A1)
São Miguel, Azores
8m
08-oct-2005
EU349178
LAF4197
MD0002162
Peyssonnelia squamaria (A1)
Pico, Azores
26 m
10-aug-2011
D. Gabriel, J. Micael
KR732897*
LAF6390
MD0002066
Peyssonnelia squamaria (A1)
São Miguel, Azores
intertidal
10-jul-2011
M.I. Parente, D. Gabriel
KR732900*
LAF6393
MD0001927
Peyssonnelia squamaria (A1)
São Miguel, Azores
15 m
29-oct-2010
A. Botelho
KR732899*
LAF6395
MD0001933
Peyssonnelia squamaria (A1)
São Miguel, Azores
12 m
05-jul-2011
A. Botelho, M. Dionísio, C.
Lopes
KR732898*
K229
SMG-06-88
Peyssonnelia squamaria (A2)
São Miguel, Azores
16 m
11-aug-2006
EU349174
K231
GRW-06-100
Peyssonnelia squamaria (A3)
Graciosa, Azores
15 m
22-jun-2006
EU349176
K230
CAT-06-10
Peyssonnelia squamaria (B)
Catalonia, Spain
intertidal
16-jul-2006
EU349175
LAF5459
PG-08-1353
Peyssonnelia squamaria (C)
Malta
10 m
06-aug-2008
M.I. Parente, J. Micael
KR732910*
LAF5357
PG-08-1210
Peyssonnelia squamaria (D)
Malta
15 m
02-aug-2008
M.I. Parente
KR732905*
LAF5360
PG-08-1146
Peyssonnelia squamaria (D)
Malta
30 m
02-aug-2008
M.I. Parente, J. Micael
KR732909*
LAF5362
PG-08-1248
Peyssonnelia squamaria (D)
Malta
26 m
05-aug-2008
M.I. Parente, J. Micael
KR732901*
LAF5363
PG-08-1088
Peyssonnelia squamaria (D)
Malta
30 m
02-aug-2008
M.I. Parente, J. Micael
KR732902*
LAF5455
PG-08-1100
Peyssonnelia squamaria (D)
Malta
30 m
02-aug-2008
M.I. Parente, J. Micael
KR732907*
LAF5458
PG-08-1153
Peyssonnelia squamaria (D)
Malta
30 m
02-aug-2008
M.I. Parente, J. Micael
KR732904*
LAF5463
PG-08-795
Peyssonnelia squamaria (D)
Sicily, Italy
intertidal
12-mar-2008
M.I. Parente, R. Sousa, J.
Matzen
KR732903*
Extraction
Taxa
Locality
Depth
Collection
date
Collector
Accession number
LAF5464
PG-08-756
Peyssonnelia squamaria (D)
Sicily, Italy
intertidal
12-mar-2008
M.I. Parente, R. Sousa, J.
Matzen
KR732906*
LAF5465
PG-08-747
Peyssonnelia squamaria (D)
Sicily, Italy
intertidal
12-mar-2008
M.I. Parente
KR732908*
LAF5355
PG-08-1268
Peyssonnelia coriacea
Malta
26 m
05-aug-2008
M.I. Parente, J. Micael
KR732911*
LAF5361
PG-08-1173
Peyssonnelia coriacea
Malta
30 m
02-aug-2008
M.I. Parente, J. Micael
KR732912*
LAF5457
PG-08-1291
Peyssonnelia coriacea
Malta
26 m
05-aug-2008
M.I. Parente, J. Micael
KR732913*
LAF5461
PG-08-804
Peyssonnelia polymorpha
Sicily, Italy
intertidal
12-mar-2008
M.I. Parente, R. Sousa, J.
Matzen
KR732915*
LAF5462
PG-08-790
Peyssonnelia polymorpha
Sicily, Italy
intertidal
12-mar-2008
M.I. Parente, R. Sousa, J.
Matzen
KR732916*
GWS018179
Peyssonnelia polymorpha
Sicily, Italy
-
10-apr-2010
G. Furnari
PG-08-551
Peyssonnelia polymorpha
Sicily, Italy
intertidal
09-mar-2008
M.I. Parente
KR732914*
LAF4199
Collection number
JX969797
K166
LAF-8-2-1-1-12
Peyssonnelia rubra
Liguria, Italy
3m
02-aug-2001
B. Gavio
EU349179
K217
LAF-7-30-1-1-2
Peyssonnelia bornetii
Liguria, Italy
3m
30-jul-2001
B. Gavio
EU349180
K218
LAF-7-28-1-1-2
Peyssonnelia bornetii
Liguria, Italy
2-20 m
28-jul-2001
B. Gavio
EU349181
K241
LAF-2-6-01-2-2
Peyssonnelia replicata
KwaZulu-Natal, South Africa
intertidal
06-feb-2001
T. Schils
EU349182
K243
LAF-7-23-93-1-1
Peyssonnelia replicata
KwaZulu-Natal, South Africa
Drift
(beach)
23-jul-1993
M. Hommersand
EU349183
K214
LAF-2-6-01-1-15
Sonderopelta capensis
KwaZulu-Natal, South Africa
30 m
06-feb-2001
S. Fredericq & O. De Clerck
EU349186
K215
LAF-2-6-01-1-1
Sonderopelta capensis
KwaZulu-Natal, South Africa
30 m
06-feb-2001
S. Fredericq & O. De Clerck
EU349187
K220
LAF-7-13-95-1-1
Sonderopelta coriacea
Victoria, Australia
-
13-jul-1995
M. Hommersand
EU349190
Gabriel et al.
Fig. 2. Consensus phylogram obtained from the Bayesian Inference analysis under the best partition
scheme. Numbers besides nodes indicate posterior-probabilities (BI) and bootstrap values (ML),
respectively. Vertical bars correspond to the different species found with ABGD (blue) and GMYC
(pink) analyses.
Mediterranean and corresponded to P. coriacea
from Malta, P. polymorpha from Sicily, P. rubra
and P. bornetii both from Liguria, Italy. The other
true Peyssonnelia species besides the Mediterranean taxa is the Indian Ocean taxon P. replicata
from KwaZulu-Natal, South Africa. Of all the
Peyssonnelia species recognized in this study, P.
squamaria has the widest distribution range, encompassing Sicily, Malta, Mediterranean Spain,
Greece (not shown) and three islands of the
Azorean archipelago.
6
Six haplotypes were observed within the
Peyssonnelia squamaria clade (Fig. 3), three in
the Azores (A1, A2, A3) and three in the Mediterranean (B, C, D). P. squamaria is found to be
more genetically diverse in the type locality, i.e.,
in the Mediterranean than in the Azores. In the
former, three haplotypes are observed with 2 to 4
mutational steps between them, while in the latter, three separate haplotypes recovered have only
1 to 2 mutational steps.
Peyssonnelia in the Azores
Fig. 3. RbcL haplotype network of Peyssonnelia squamaria and its spatial distribution in the North
Atlantic. Haplotype and population sizes are proportional to the number of individual;
dach haplotype is represented by a color and a letter (A1 to D).
CONCLUSION
ACKNOWLEDGMENTS
Only a single, true Peyssonnelia species is confirmed for the Azorean Archipelago, in contrast to
the five previously reported (Parente 2010). Although the populations in the Azores are genetically different from those occurring in the Mediterranean, this separation might be relatively recent, since the archipelago emerged about 8 My
ago (Rumeu et al. 2011). Further studies including more islands and more samples are necessary
to assess the variability of the species within the
archipelago and the connection between its populations (Gabriel et al. 2014).
We greatly acknowledge support from a grant
from the National Science Foundation Systematics Program (DEB-1027110 to SF). During this
research, DG was supported by FCT grant
SFRH/BPD/64963/2009. We are grateful to Manuela I. Parente for granting access to her sample
collection, to Joana Micael for helping with the
haplotype networks, and to António Medeiros for
providing the maps.
7
Gabriel et al.
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