Publications by authors named "Angelica Crottini"

Frogs of the genus Platypelis are known to have their center of species richness in the mountain massifs of northern Madagascar. We here formally describe a new species of Platypelis from this region. Platypelis saikamavo sp.

View Article and Find Full Text PDF

The Lygodactylus tolampyae complex includes several deep genetic lineages of small diurnal geckos from the West and North West of Madagascar whose taxonomy is largely unsolved. We sequenced DNA fragments of one mitochondrial and four nuclear-encoded genes for up to 70 samples across the entire known range of these geckos. We find as many as 11 mitochondrial lineages differentiated by >4% pairwise distances in the 16S rRNA gene fragment, with >9% pairwise distance for the majority of lineage comparisons.

View Article and Find Full Text PDF
Article Synopsis
  • The mantellid subgenus Phylacomantis, comprising four frog species in Madagascar, is analyzed using molecular techniques to confirm their genetic distinctness and relationships based on nuclear and mitochondrial gene data.
  • The study reveals that G. pseudoasper shows low genetic variation across its range, while new specimens from the North East and North West have high genetic distances, suggesting they may belong to a new subspecies of G. corvus, named G. corvus bakilana ssp. nov.
  • The findings highlight a rare biogeographic pattern of separated sister lineages in Madagascar, indicating an urgent need for further research in the understudied humid forest fragments in the region.
View Article and Find Full Text PDF
Article Synopsis
  • Amphibians are a diverse group of tetrapods facing significant threats, with about 41% of species at risk of extinction due to various factors like habitat loss and climate change.
  • Genomic research on amphibians is critical for understanding their biology, including unique traits like tissue regeneration and adaptation, yet it has lagged behind other vertebrates due to technical challenges.
  • The newly formed Amphibian Genomics Consortium (AGC) aims to enhance global collaboration and accelerate genomic research in amphibians, with over 282 members from 41 countries already involved.
View Article and Find Full Text PDF

Amphibians are experiencing severe population declines, requiring targeted conservation action for the most threatened species and habitats. Unfortunately, we do not know the basic demographic traits of most species, which hinders population recovery efforts. We studied one of Madagascar's most threatened frog species, the harlequin mantella (), to confirm it is still present at historic localities and estimate annual survival and population sizes.

View Article and Find Full Text PDF
Article Synopsis
  • A genomic database encompassing all eukaryotic species on Earth is crucial for scientific advancements, yet most species lack genomic data.
  • The Earth BioGenome Project (EBP) was initiated in 2018 by global scientists to compile high-quality reference genomes for approximately 1.5 million recognized eukaryotic species.
  • The European Reference Genome Atlas (ERGA) launched a Pilot Project to create a decentralized model for reference genome production by testing it on 98 species, providing valuable insights into scalability, equity, and inclusiveness for genomic projects.
View Article and Find Full Text PDF
Article Synopsis
  • Portugal has a lot of different plants and animals because of its unique geography and history, but these species are in danger from things like climate change and over-exploitation.
  • Researchers in Portugal are working together through a project called Biogenome Portugal to study and document biodiversity, which means looking closely at the genes of different species.
  • The goal is to create a library of genetic information to help protect endangered species and promote conservation efforts in Portugal, especially for unique plants and animals found only there.
View Article and Find Full Text PDF

Phylogenetic diversity is an increasingly applied metric used to maximize the representation of evolutionary history in spatial conservation planning. When following this approach, researchers commonly overlook sites with a relatively higher proportion of recently diverged endemic species, also known as centers of neo-endemism. Here we aim to demonstrate how targeting the conservation of different facets of diversity (taxonomic diversity, phylogenetic diversity and centers of endemism) can provide more cost-effective solutions to the conservation of the all evolutionary spectrum of biodiversity.

View Article and Find Full Text PDF

The songs of birds are complex signals that may have several functions and vary widely among species. Different ecological, behavioural and morphological factors, as well as phylogeny, have been associated as predictors of the evolution of song structure. However, the importance of differences in development, despite their relevance, has seldom been considered.

View Article and Find Full Text PDF

Madagascar is well known for its exceptional biodiversity and striking endemicity levels, which are accompanied by high rates of deforestation and habitat alteration [...

View Article and Find Full Text PDF

Amphibians represent a diverse group of tetrapods, marked by deep divergence times between their three systematic orders and families. Studying amphibian biology through the genomics lens increases our understanding of the features of this animal class and that of other terrestrial vertebrates. The need for amphibian genomic resources is more urgent than ever due to the increasing threats to this group.

View Article and Find Full Text PDF

Objective: A reliable taxonomic identification of species from molecular samples is the first step for many studies. For researchers unfamiliar with programming, running a BLAST analysis, filtering, and organizing results for hundreds of sequences through the BLAST web interface can be difficult. Additionally, sequences deposited in GenBank can have outdated taxonomic identification.

View Article and Find Full Text PDF
Article Synopsis
  • The study focuses on the Malagasy frog species Platypelis mavomavo, originally recognized by its bright yellow underbelly, which has limited research since its description in 2003.
  • Researchers analyze genetic variations in P. mavomavo and a newly identified candidate species, Platypelis sp. Ca10, revealing that color differences are linked to geographic distribution rather than genetic variation.
  • The findings indicate that P. mavomavo has a broader habitat range than previously thought, suggesting a need for reevaluation of its conservation status in Madagascar.
View Article and Find Full Text PDF

Human activities are accelerating rates of biological invasions and climate-driven range expansions globally, yet we understand little of how genomic processes facilitate the invasion process. Although most of the literature has focused on underlying phenotypic correlates of invasiveness, advances in genomic technologies are showing a strong link between genomic variation and invasion success. Here, we consider the ability of genomic tools and technologies to (i) inform mechanistic understanding of biological invasions and (ii) solve real-world issues in predicting and managing biological invasions.

View Article and Find Full Text PDF

Using an integrative taxonomic approach including genetic and morphological data, we formally describe a new microendemic gecko species belonging to the clade, previously referred to as D. We name this taxon currently known from Anja Reserve and Tsaranoro Valley Forest (south-central Madagascar), as The new species differs from other species of the clade by ≥ 12.4% uncorrected -distance at the mitochondrial 16S rRNA gene and it forms a monophyletic group in the COI mtDNA phylogenetic tree.

View Article and Find Full Text PDF

The host-microbiome community is influenced by several host and environmental factors. In order to disentangle the individual effects of host and environment, we performed a laboratory experiment to assess the effects of the exposure to different water sources on the skin and gut microbiome of two amphibian species (Pelophylax perezi and Bufo spinosus). We observed that the bacterial communities greatly varied with water environment and host identity.

View Article and Find Full Text PDF
Article Synopsis
  • The Blommersia wittei complex includes widespread frog species in western and northern Madagascar and has also reached the Comoran island of Mayotte.
  • After analyzing DNA sequences and other data, researchers identified a new species, Blommeria bara sp. nov., and confirmed its distinct evolutionary lineage in western Madagascar.
  • The complex showcases both widespread species and rare, localized lineages, indicating the need for further research to understand interactions between these groups and potential variations in their morphology and bioacoustics.
View Article and Find Full Text PDF

We analyzed the body length, age structure, and age at sexual maturity of the invasive Asian common toad from different sites in Toamasina, east Madagascar. We used skeletochronology as a proxy for age estimation, while gonads were histologically analyzed to determine the age of sexual maturity. The analysis of pooled age data from three sites investigated in 2016 showed that both sexes were larger, although not older, than those of native populations.

View Article and Find Full Text PDF

Invasion dynamics are determined, among other aspects, by the spatial behaviour of invasive populations. The invasive toad Duttaphrynus melanostictus is spreading inland from the eastern coast of Madagascar, causing considerable ecological impacts. Understanding the basic factors determining the spread dynamics can inform management strategies and provide insights into spatial evolutionary processes.

View Article and Find Full Text PDF

The availability of public genomic resources can greatly assist biodiversity assessment, conservation, and restoration efforts by providing evidence for scientifically informed management decisions. Here we survey the main approaches and applications in biodiversity and conservation genomics, considering practical factors, such as cost, time, prerequisite skills, and current shortcomings of applications. Most approaches perform best in combination with reference genomes from the target species or closely related species.

View Article and Find Full Text PDF

A new species of scops-owl (Aves, Strigiformes, Strigidae, ) is described from Príncipe Island, São Tomé and Príncipe (Gulf of Guinea, Africa). This species was discovered for science in 2016, although suspicions of its occurrence gained traction from 1998, and testimonies from local people suggesting its existence could be traced back to 1928. Morphometrics, plumage colour and pattern, vocalisations, and molecular evidence all support the species status of the scops-owl from Príncipe, which is described here as Phylogenetic analyses suggest that this species descended from the first colonisation of the Gulf of Guinea islands, being sister to the clade including the mainland African Scops-Owl , and the island endemics Sao Tome Scops-Owl and Pemba Scops-Owl .

View Article and Find Full Text PDF

Madagascar's unique biota is heavily affected by human activity and is under intense threat. Here, we review the current state of knowledge on the conservation status of Madagascar's terrestrial and freshwater biodiversity by presenting data and analyses on documented and predicted species-level conservation statuses, the most prevalent and relevant threats, ex situ collections and programs, and the coverage and comprehensiveness of protected areas. The existing terrestrial protected area network in Madagascar covers 10.

View Article and Find Full Text PDF
Article Synopsis
  • Madagascar is home to a hyperdiverse array of species, many of which are endemic, meaning they are found nowhere else in the world.
  • Recent research has led to the discovery of many new species, but significant gaps remain in our knowledge, especially concerning fungi and most invertebrates.
  • The island's humid forests are vital for biodiversity, but other ecosystems like the Central Highlands and spiny forest also hold important species, making ongoing research essential for conservation and understanding of Madagascar’s unique environment.
View Article and Find Full Text PDF

A PHP Error was encountered

Severity: Warning

Message: fopen(/var/lib/php/sessions/ci_session7h5n7j2ffs5s37747m3q3jvgd1s3ida9): Failed to open stream: No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 177

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)

Filename: Session/Session.php

Line Number: 137

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once