Cruz Marquez

Cruz Marquez
University of Rome Tor Vergata | UNIROMA2 · Dipartimento di Biologia

About

45
Publications
11,099
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
690
Citations
Citations since 2016
2 Research Items
307 Citations
20162017201820192020202120220204060
20162017201820192020202120220204060
20162017201820192020202120220204060
20162017201820192020202120220204060

Publications

Publications (45)
Chapter
Full-text available
This article attempts to explain why Opuntia megasperma var. orientalis is now rare on Española Island, Galapagos. We give a detailed description of the principal components of the island ecosystem that could have interacted, from the past to the present, and could have shaped the stages of ecological succession, resulting in the present rarity of...
Article
Efforts to eradicate nonnative mammals to restore oceanic island ecosystems have become increasingly successful but parallel tracking of response by native species for which control efforts are intended to benefit has been rare. A major campaign to eradicate nonnative goats and burros was initiated in 1995 on Alcedo Volcano in the Galápagos Archipe...
Article
Full-text available
This Checklist of Galapagos Reptiles includes a total of all 56 taxa reported from the Galapagos Islands. For each name, detailed information is provided: its Galapagos distribution in islands groups or bioregions generated from the specimen records, comments about the taxonomy (especially synonyms), the origin (native and introduced), taxon status...
Article
Full-text available
This Checklist of Galapagos Amphibians includes a total of all 2 taxa reported from the Galapagos Islands. For each name, detailed information is provided: its Galapagos distribution in islands groups or bioregions generated from the specimen records, comments about the taxonomy (especially synonyms), the origin (native and introduced), taxon statu...
Article
Full-text available
Antibiotic resistance, evolving and spreading among bacterial pathogens, poses a serious threat to human health. Antibiotic use for clinical, veterinary and agricultural practices provides the major selective pressure for emergence and persistence of acquired resistance determinants. However, resistance has also been found in the absence of antibio...
Data
Table S1: Possible dispersal distances of marine iguanas.
Data
Figure S3: Mismatch distribution of Galápagos marine iguana D-loop haplotypes.
Data
Table S2: Detailed infromation on D-loop haplotypes.
Data
Supporting information on mitochondrial CR analyses [88-93].
Data
Table S3: General characteristics of the three mitochondrial clades of Galápagos marine iguanas.
Data
Figure S1: Estimation of genetic clusters according to Evanno et al.
Data
Table S4: Best found partitions according to BAPS v3.2.
Data
Figure S2: Scatter plot FST(based on microsatellite loci) versus possible dispersal distance.
Data
Figure S4: Scatter plot with regression analysis of island perimeter as measured by NOAA GIS resource (World Vector Coastline) vs genetic diversity values.
Data
Table S5: Intra locus specific k-values of thirteen microsatellite loci of Galápagos marine iguana populations.
Article
Full-text available
Marine iguanas (Amblyrhynchus cristatus) inhabit the coastlines of large and small islands throughout the Galápagos archipelago, providing a rich system to study the spatial and temporal factors influencing the phylogeographic distribution and population structure of a species. Here, we analyze the microevolution of marine iguanas using the complet...
Article
Full-text available
Abstract Physiological responses to organismal stress can have direct impacts on individual fitness. While responses to stressors mediated by glucocorticoid hormones are well studied, the regulation of the redox system via pro-oxidant and antioxidant balance as well as the natural causes of oxidative stress in nature remain poorly known, especially...
Data
Haplotype networks of the La Reserva and Cerro Fatal populations based on a fragment of the mtDNA control region. Dot size corresponds to the number of individuals sharing the same haplotype. On the bottom left, scale size is indicated. Black dots represent median vectors; each line represents one mutational step, unless recorded otherwise noted by...
Article
Full-text available
Despite the attention given to them, the Galápagos have not yet finished offering evolutionary novelties. When Darwin visited the Galápagos, he observed both marine (Amblyrhynchus) and land (Conolophus) iguanas but did not encounter a rare pink black-striped land iguana (herein referred to as "rosada," meaning "pink" in Spanish), which, surprisingl...
Article
Full-text available
Galápagos tortoises represent the only surviving lineage of giant tortoises that exhibit two different types of shell morphology. The taxonomy of Galápagos tortoises was initially based mainly on diagnostic morphological characters of the shell, but has been clarified by molecular studies indicating that most islands harbor monophyletic lineages, w...
Article
Full-text available
The Galápagos land iguanas (genus Conolophus) have faced significant anthropogenic disturbances since the 17th century, leading to severe reduction of some populations and the extinction of others. Conservation activities, including the repatriation of captive-bred animals to depleted areas, have been ongoing since the late 1970s, but genetic infor...
Article
We evaluated the role that endangered species reintro- duction efforts can play in the larger context of ecosys- tem restoration. To do so, we examined interactions between endangered giant tortoises (Geochelone nigra hoodensis), currently being reintroduced to Isla Espano- la, Galapagos, and an arboreal cactus (Opuntia mega- sperma var. megasperma...
Data
Locus specific heterozygosity values for 13 microsatellite loci for pre- and post-El Niño island samplings. Locus specific heterozygosities calculated using the program ARLEQUIN for marine iguana populations sampled before the 1997–1998 El Niño (in 1991 or in 1993 or as for Santa Fé in both years) and after the 1997–1998 El Niño in the year 2004. T...
Data
List of haplotype diversity (Hd) values and their variance (V) for marine iguana populations. List of haplotype diversity (Hd) values and their variance (V) for marine iguana populations from both time points. T-values and their corresponding probabilities are based on the test adapted by Nei [37] and reflect whether Hd values are significantly dif...
Data
Graphical display of the TM3 results (estimates of the effective population size [Ne] generated from the temporal variance of allele frequencies using a likelihood-based approach) as provided by the program NeESTIMATOR. Graphical display of the TM3 results (estimates of the effective population size (Ne) generated from the temporal variance of alle...
Data
Sampling localities by island and sample sizes for 13 microsatellite loci and mitochondrial control region sequences (1183 bp) for the two temporal samplings (1991/1993 and 2004). The first column lists sampling localities by island, specific sampling location (in parentheses), and geographical coordinates. Sample sizes for 13 microsatellite loci a...
Data
List of nucleotide diversity (π) values and their variance (V) for marine iguana populations. List of nucleotide diversity (π) values and their variance (V) for marine iguana populations from both time points. T-values and their corresponding probabilities are based on the test adapted by Nei [37] and reflect whether π values are significantly diff...
Article
Full-text available
The El Niño-Southern Oscillation (ENSO) is a major source of climatic disturbance, impacting the dynamics of ecosystems worldwide. Recent models predict that human-generated rises in green-house gas levels will cause an increase in the strength and frequency of El Niño warming events in the next several decades, highlighting the need to understand...
Article
Full-text available
Giant Galápagos tortoises on the island of Española have been the focus of an intensive captive breeding-repatriation programme for over 35 years that saved the taxon from extinction. However, analysis of 118 samples from released individuals indicated that the bias sex ratio and large variance in reproductive success among the 15 breeders has seve...
Article
Volcanic islands represent excellent models with which to study the effect of vicariance on colonization and dispersal, particularly when the evolution of genetic diversity mirrors the sequence of geological events that led to island formation. Phylogeographic inference, however, can be particularly challenging for recent dispersal events within is...
Article
Full-text available
Carotenoids have received much attention from biologists because of their ecological and evolutionary implications in vertebrate biology. We sampled Galápagos land iguanas (Conolophus subcristatus) to investigate the types and levels of blood carotenoids and the possible factors affecting inter-population variation. Blood samples were collected fro...
Article
Full-text available
As once boldly stated, 'bad taxonomy can kill', highlighting the critical importance of accurate taxonomy for the conservation of endangered taxa. The concept continues to evolve almost 15 years later largely because most legal protections aimed at preserving biological diversity are based on formal taxonomic designations. In this paper we report u...
Article
Full-text available
El Niño / Oscilación del Sur (ENOS) por interacción oceánico–atmosférica en el océano Pacífico tropical afecta al componente biológico. Estudios científicos sugieren que en iguanas marinas (Amblyrhynchus cristatus Bell, 1825) de Galápagos el impacto es negativo. La Fundación Charles Darwin para obtener información de largo plazo estableció un proye...
Data
Full-text available
El Niño - Southern Oscillation and health status of galapagos marine iguana (Amblyrhynchus cristatus). XXVII National Meeting of Biology. Biology Society of Ecuador. Quito, Ecuador. 2003. Patricia Castillo-Briceño, Cruz Márquez, David Wiedenfeld, Howard Snell y Alberto Jaramillo Fundación Charles Darwin pcastillo@fcdarwin.org.ec; marquez@fcdarwin...
Article
Full-text available
The natural fauna of the Galapagos Islands contains four of the five classes of vertebrates. Various species of fish, reptiles, birds and mammals have been present in the Islands for the last several million years. One class, amphibians, has been unable to colonize the remote oceanic archipelago during all of that time primarily due its intolerance...
Conference Paper
Full-text available
In the 1980s, personnel of the Charles Darwin Research Station conducted a series of experiments to determine the optimal conditions for incubating eggs of captive giant tortoises. Parameters of interest included water potential of the nesting substrate and temperature of incubation. Research on Isabela Island from July 1997 to May 1998 extended th...
Article
If it is assumed to be a reproductive attempt for a young tortoise deliberately to mount another, using its front legs to raise the anterior portion of the body, and then to bring together the cloacas of the two individuals, along with the groaning vocalizations produced by males when they attempt copulation with females, such vocali zations were n...
Article
Full-text available
The present status of populations of giant land tortoises (Geochelone spp) in the Galápagos Islands was studied. Geographical distribution, mark and recapture methods, population structure, population density, sex ratios, predation and other threats were considered in this context. Old records show that the present distribution and population demog...
Article
The land iguana captive-rearing program at the Charles Darwin Research Station (CDRS) is celebrating its tenth anniversary. There have been many notable successes over these years, but many challenges still face us. Personal sacrifices as well as co-operative efforts between the CDRS and the Galapagos National Park Service (GNPS) have made the prog...

Network

Cited By