scholarly journals Sawfish, read in tooth and saw: Rostral teeth as endogenous chemical records of movement and life‐history in a critically endangered species

2021 ◽  
Author(s):  
Jens C. Hegg ◽  
Breanna Graves ◽  
Chris M. Fisher
Keyword(s):  
Life History ◽  
Endangered Species ◽  
Critically Endangered ◽  
Critically Endangered Species

Life history and demographic features of Astragalus nitidiflorus, a critically endangered species

Flora ◽  
2011 ◽  
Vol 206 (5) ◽  
pp. 423-432 ◽  
Author(s):  
Juan J. Martínez-Sánchez ◽  
Francisco Segura ◽  
Mayra Aguado ◽  
José A. Franco ◽  
María J. Vicente
Keyword(s):  
Life History ◽  
Endangered Species ◽  
Critically Endangered ◽  
Critically Endangered Species ◽  
Demographic Features

scholarly journals Sawfish, Read in Tooth and Saw: rostral teeth as endogenous chemical records of movement and life-history in a critically endangered species

2019 ◽  
Author(s):  
Jens C. Hegg ◽  
Breanna Graves ◽  
Chris M. Fisher
Keyword(s):  
Life History ◽  
Endangered Species ◽  
Critically Endangered ◽  
Historical Sources ◽  
Continuous Growth ◽  
Chemical Tracers ◽  
Critically Endangered Species ◽  
Salinity Gradients ◽  
Archived Samples ◽  
History Of

AbstractThe ecology of endangered and rare species can be difficult to study due to their low abundances and legal limits on scientist’s ability to catch, sample, and track them. This is particularly true of sawfish (family Pristidae) whose numbers have declined precipitously, placing all five species on the CITES list of critically endangered species worldwide. Best known for their distinctive, toothed rostrum the ecology, movement, and life-history of sawfish is poorly understood. Sawfish rostral teeth are modified placoid scales, which grow continuously throughout the life of the fish. This continuous growth, combined with their stable calcified makeup, makes sawfish teeth a potential source of temporal records of chemical and isotopic changes through the life of the fish. Rostral teeth can be removed non-lethally from living animals and are also often preserved in rostra housed in museums and as curios, potentially allowing both contemporaneous and historical sources of life-history data. Study of the potential for sawfish rostral teeth as endogenous chemical and structural records is extremely limited, however. Using archived samples of largetooth sawfish (Pristis pristis) we show that multiple chemical tracers can be recovered from sawfish teeth, and that these tracers can be used to understand movement across salinity gradients and between freshwater and the ocean. We further show that sawfish teeth contain repeated structures and indistinct banding which could potentially be used for aging or growth analysis of fish.

Where have all the sawfishes gone? Perspectives on declines of these Critically Endangered species in Sri Lanka

2021 ◽  
Author(s):  
Akshay Tanna ◽  
Daniel Fernando ◽  
Ramajeyam Gobiraj ◽  
Buddhi M. Pathirana ◽  
Sahan Thilakaratna ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Endangered Species ◽  
Critically Endangered ◽  
Critically Endangered Species

scholarly journals The Oral Bacterial Community in Melanophryniscus admirabilis (Admirable Red-Belly Toads): Implications for Conservation

2021 ◽  
Vol 9 (2) ◽  
pp. 220
Author(s):  
Michele Bertoni Mann ◽  
Janira Prichula ◽  
Ícaro Maia Santos de Castro ◽  
Juliana Mello Severo ◽  
Michelle Abadie ◽  
...  
Keyword(s):  
Endangered Species ◽  
Bacterial Community ◽  
High Throughput Sequencing ◽  
Dietary Diversity ◽  
Natural Habitat ◽  
Critically Endangered ◽  
Personal Genome ◽  
Oral Microbiota ◽  
Critically Endangered Species ◽  
Anthropogenic Environment

Melanophryniscus admirabilis (admirable red-belly toad) is a microendemic and critically endangered species found exclusively along 700 m of the Forqueta River, in a fragment of the Atlantic Forest of southern Brazil. One of the greatest concerns regarding the conservation of this species is the extensive use of pesticides in areas surrounding their natural habitat. In recent years, the adaptation and persistence of animal species in human-impacted environments have been associated with microbiota. Therefore, the present study aimed to characterize the oral bacterial community of wild M. admirabilis and to address the question of how this community might contribute to this toad’s adaptation in the anthropogenic environment as well as its general metabolic capabilities. A total of 11 oral samples collected from wild M. admirabilis were characterized and analyzed via high-throughput sequencing. Fragments of the 16S rRNA variable region 4 (V4) were amplified, and sequencing was conducted using an Ion Personal Genome Machine (PGM) System with 316 chips. A total of 181,350 sequences were obtained, resulting in 16 phyla, 34 classes, 39 orders, and 77 families. Proteobacteria dominated (53%) the oral microbiota of toads, followed by Firmicutes (18%), Bacteroidetes (17%), and Actinobacteria (5%). No significant differences in microbial community profile from among the samples were reported, which suggests that the low dietary diversity observed in this population may directly influence the bacterial composition. Inferences of microbiome function were performed using PICRUSt2 software. Important pathways (e.g., xenobiotic degradation pathways for pesticides and aromatic phenolic compounds) were detected, which suggests that the bacterial communities may serve important roles in M. admirabilis health and survival in the anthropogenic environment. Overall, our results have important implications for the conservation and management of this microendemic and critically endangered species.

scholarly journals High survival rate of a critically endangered species, the Azores Bullfinch Pyrrhula murina, as a contribution to population recovery

2010 ◽  
Vol 151 (3) ◽  
pp. 627-636 ◽  
Author(s):  
David Monticelli ◽  
Ricardo Ceia ◽  
Ruben Heleno ◽  
Hugo Laborda ◽  
Sergio Timóteo ◽  
...  
Keyword(s):  
Survival Rate ◽  
Endangered Species ◽  
Critically Endangered ◽  
High Survival ◽  
Population Recovery ◽  
High Survival Rate ◽  
Critically Endangered Species

scholarly journals Effects of Lead on Ultrastructure of Isoetes sinensis Palmer (Isoetaceae), a Critically Endangered Species in China

PLoS ONE ◽  
2015 ◽  
Vol 10 (9) ◽  
pp. e0139231 ◽  
Author(s):  
Guohua Ding ◽  
Chunye Li ◽  
Xu Han ◽  
Chunyu Chi ◽  
Dawei Zhang ◽  
...  
Keyword(s):  
Endangered Species ◽  
Critically Endangered ◽  
Critically Endangered Species

Genomic characteristics of critically endangered Chimonobambusa hirtinoda C.S. Chao & K.M. Lan

2021 ◽  
Vol 50 (1) ◽  
pp. 69-77
Author(s):  
Tengfei Shen ◽  
Youmiao Zheng ◽  
Zimou Sun ◽  
Meng Xu
Keyword(s):  
Endangered Species ◽  
Frequency Analysis ◽  
Natural Habitat ◽  
Gc Content ◽  
Critically Endangered ◽  
Critically Endangered Species ◽  
Phylogenetic Studies ◽  
Ssr Loci ◽  
Ecological Conservation ◽  
Repeat Rate

With its unique square-shaped culm, Chimonobambusa hirtinoda C.S. Chao & K.M. Lan is a critically endangered species, and its natural habitat is solely restricted to Doupeng Mountain in Guizhou, China. Two small-insert libraries from C. hirtinoda were constructed and sequenced. Approximately 127.83 Gb of highquality reads were generated and assembled into 9,320,997 contigs with a N50 length of 213bp, thereby producing 8,867,344 scaffolds with total length of 2.01 Gb. An estimated genome size of C. hirtinode was 2.86 Gb on the basis of k-mer frequency analysis, with the GC content of 45.40%. The repeat rate and heterozygous ratio were 74.11 and 1.48% in C. hirtinoda genome, respectively. Finally, 65,398 SSR loci were identified in the assembled contigs, including 58.66% tri-nucleotide, 27.42% di-nucleotide, 7.94% tetranucleotide, 3.67% penta-nucleotide, and 2.31% hexa-nucleotide. Results of this study are useful not only for ecological conservation of C. hirtinoda, but also for phylogenetic studies.

Lymania involucrata (Bromeliaceae: Bromelioideae), a new ornamental species from Bahia, Brazil

Phytotaxa ◽  
2021 ◽  
Vol 489 (2) ◽  
pp. 209-215
Author(s):  
EVERTON HILO DE SOUZA ◽  
LIDYANNE Y. S. AONA ◽  
FERNANDA V. D. SOUZA ◽  
ELTON M. C. LEME
Keyword(s):  
New Species ◽  
Endangered Species ◽  
Atlantic Forest ◽  
Critically Endangered ◽  
Critically Endangered Species ◽  
Ornamental Species ◽  
Shape And Size

The authors describe, discuss, and illustrate Lymania involucrata, a new ornamental species from the Atlantic Forest in the municipality of Igrapiúna, Bahia, Brazil, here considered a critically endangered species. The new species is morphologically related to L. brachycaulis but clearly diffe According to Sousa rs from it by the well-developed, involucral primary bracts and the distinct shape and size of inflorescence, primary branches, and flowers. A map of the distribution of the species and taxonomic comments are presented.

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