Anabaenopsis morphospecies (Cyanobacteria, Nostocales) from Los Patos shallow lake (Province of Buenos Aires, Argentina)

Phytotaxa ◽  
2016 ◽  
Vol 272 (3) ◽  
pp. 173 ◽  
Author(s):  
ANABELLA AGUILERA ◽  
JIŘĺ KOMÁREK ◽  
RICARDO O. ECHENIQUE
Keyword(s):  
Population Dynamics ◽  
Species Richness ◽  
Shallow Lake ◽  
Algal Blooms ◽  
Buenos Aires ◽  
Morphological Diversity ◽  
Abundant Species ◽  
American Continent ◽  
First Report ◽  
Almost All

The genus Anabaenopsis comprises about 20 morphospecies distributed in plankton of tropical, subtropical and temperate regions during warm periods. The morphological diversity and population dynamics of Anabaenopsis species from one artificial shallow lake from the Province of Buenos Aires, Argentina, was studied during summer 2005 and 2006; and from April 2012 to May 2014. The most common and abundant species were identified as A. elenkinii and A. cf. cunningtonii (first report in Argentina). Anabaenopsis circularis and A. milleri (first report in the American continent and Argentina) were less common, whereas A. nadsonii was rarely observed. Almost all species contributed to algal blooms during warm periods. However, some species were registered even under the lowest temperatures recorded (7.5 °C) and sustained biovolume also during winter (A. milleri, A. elenkinii and A. cf. cunningtonii). These results indicate that some species of the genus are capable of growing at temperatures much lower than 20°C. The species richness noted in this study suggests that there is likely much more diversity remaining on this genus to be reported in Argentina.

scholarly journals Small mammal populations of an agroecosystem in the Atlantic Forest domain, southeastern Brazil

2007 ◽  
Vol 67 (1) ◽  
pp. 179-186 ◽  
Author(s):  
PS. D’Andrea ◽  
R. Gentile ◽  
LS. Maroja ◽  
FA. Fernandes ◽  
R. Coura ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Species Richness ◽  
Atlantic Forest ◽  
Small Mammal ◽  
Abundant Species ◽  
Common Species ◽  
Southeastern Brazil ◽  
Small Mammal Community ◽  
Population Sizes ◽  
Didelphis Aurita

This study reports 2 years of the population dynamics and reproduction of a small mammal community using the removal method. The study was conducted in a rural area of the Atlantic Forest, in Sumidouro, Rio de Janeiro State, Brazil. The population sizes, age structure and reproduction were studied for the four most common species in the study area. The overall diversity was 1.67 and ranged between 0.8 to 1.67. The species richness was 13 considering the whole study. The most abundant species were the rodents Nectomys squamipes (n = 133), Akodon cursor (n = 74), Oligoryzomys nigripes (n = 25) and the marsupials Didelphis aurita (n = 58) and Philander frenatus (n = 50). Seven other rodents were captured once: Necromys lasiurus, Akodon montensis, Sooretamys angouya, Oecomys catherine, Oxymycterus judex, Euryzygomatomys spinosus and Trinomys iheringi. There were higher peaks for diversity and species richness during the winter (dry) months, probably due to higher food availability. The marsupials had a seasonal reproduction with highest population sizes at the end of the rainy seasons. Nectomys squamipes reproduced mostly during rainy periods. Akodon cursor reproduced predominantly in the winter with the highest population peaks occurring during this season. The analysis of the population dynamics of the rodent species indicated that no species behaved as an agricultural pest, probably due to the heterogeneous landscape of high rotativity of vegetable cultivation. Rodent populations were more susceptible to the removal procedure than marsupial ones.

scholarly journals Comunidad de pequeños roedores en una milpa tradicional del centro de Yucatán, México.

2007 ◽  
Vol 11 (1) ◽  
pp. 57 ◽  
Author(s):  
José Cimé-Pool ◽  
Silvia F. Hernández-Betancourt ◽  
Juan Chablé-Santos
Keyword(s):  
Population Dynamics ◽  
Species Richness ◽  
Key Words ◽  
Plant Species ◽  
Small Mammals ◽  
Abundant Species ◽  
Small Rodent ◽  
Small Rodents ◽  
Palabras Clave ◽  
Cultivated Plant

Abstract. A small rodent species was studied in two agroecosystems from Yucatan: (1) a traditional cornfield and (2) an induced grassland. A total of 87 individuals of six species in two families (Heteromyidae y Cricetidae) were captured rendering an effort of  2,544 nights/trap. Heteromys gaumeri and Peromyscus yucatanicus were the most abundant species with 57.5% and 17.2% of total captures, respectively. Highest captures were recorded in the traditional cornfield and the highest species richness was obtained in the grassland. No significant differences in diversity were found between sites (p > 0.05). It seems that the cornfield plays an important role on both the diversity and population dynamics of small rodents because it presents the highest values in captures, density, recruitment, and in reproductive individuals. This may be related to a greater variety of cultivated plant species in this agroecosystem. Key words: Small mammals, rodents, Cornfield, Grassland, Yucatan, Mexico. Palabras clave: Pequeños mamíferos, roedores, milpa, pastizal, Yucatán, México.

scholarly journals Biotic stability mechanisms in Inner Mongolian grassland

2020 ◽  
Vol 287 (1928) ◽  
pp. 20200675
Author(s):  
Yonghui Wang ◽  
Xiaxia Niu ◽  
Liqing Zhao ◽  
Cunzhu Liang ◽  
Bailing Miao ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Species Richness ◽  
Experimental Studies ◽  
Species Abundance ◽  
Abundant Species ◽  
Community Stability ◽  
Natural Ecosystems ◽  
Separate Species ◽  
Mongolian Grassland ◽  
Biotic Stability

Biotic mechanisms associated with species diversity are expected to stabilize communities in theoretical and experimental studies but may be difficult to detect in natural communities exposed to large environmental variation. We investigated biotic stability mechanisms in a multi-site study across Inner Mongolian grassland characterized by large spatial variations in species richness and composition and temporal fluctuations in precipitation. We used a new additive-partitioning method to separate species synchrony and population dynamics within communities into different species-abundance groups. Community stability was independent of species richness but was regulated by species synchrony and population dynamics, especially of abundant species. Precipitation fluctuations synchronized population dynamics within communities, reducing their stability. Our results indicate generality of biotic stability mechanisms in natural ecosystems and suggest that for accurate predictions of community stability in changing environments uneven species composition should be considered by partitioning stabilizing mechanisms into different species-abundance groups.

scholarly journals The Relationship between Genus/Species Richness and Morphological Diversity among Subfamilies of Jewel Beetles

Insects ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 24
Author(s):  
Yi-Jie Tong ◽  
Hai-Dong Yang ◽  
Josh Jenkins Shaw ◽  
Xing-Ke Yang ◽  
Ming Bai
Keyword(s):  
Species Richness ◽  
Local Community ◽  
Morphological Diversity ◽  
Species Level ◽  
New Paradigm ◽  
Geometric Morphometric ◽  
Positive Correlation ◽  
The Status ◽  
Almost All ◽  
The Relationship

A positive correlation between the species richness and morphological diversity of some organisms has been found in almost all studies at the local community scale. However, this documented relationship has not always been consistent because of diverse niches and the status of an organism in an ecosystem. Global taxon sampling, new morphological approaches, and consideration of more taxonomic categories other than species level are possible methods to further investigate this contradiction. In this study, we proposed a new paradigm for higher taxa biodiversity analysis based on a cosmopolitan dataset. A total of 1106 species from around the world representing all subfamilies and 33% genera of Buprestidae (jewel beetles) were selected to test the correlation between morphological diversity (MD) and genus/species richness (GR/SR) among subfamilies. The MD was quantified by the contours of the pronotum and elytron in dorsal view based on a geometric morphometric approach. The positive correlation between MD and GR was found in all test combinations, but was irrelevant in the species-level test. Interestingly, the correlation between MD and GR was higher than MD and SR in both pronotum and elytron measurements. Additionally, the MD of the pronotum is obviously higher than the MD of the elytron. Our results demonstrate that the geometric morphometric approach could quite accurately reveal diversity patterns of the family Buprestidae. Future studies on different groups, using more characters, more analyses and detailed biological interpretations, are required to fully understand the relationship between MD and SR.

From the Tower of London to the Thomas More Society of Buenos Aires: “Give me thy grace, good Lord, to set the world at nought”

Moreana ◽  
2005 ◽  
Vol 42 (Number 164) (4) ◽  
pp. 187-206
Author(s):  
Clare M. Murphy
Keyword(s):  
Buenos Aires ◽  
Short History ◽  
Thomas More ◽  
Tower Of London ◽  
Hebrew Poetry ◽  
Prayer Book ◽  
The World ◽  
History Of ◽  
Book Of Hours ◽  
Almost All

The Thomas More Society of Buenos Aires begins or ends almost all its events by reciting in both English and Spanish a prayer written by More in the margins of his Book of Hours probably while he was a prisoner in the Tower of London. After a short history of what is called Thomas More’s Prayer Book, the author studies the prayer as a poem written in the form of a psalm according to the structure of Hebrew poetry, and looks at the poem’s content as a psalm of lament.

scholarly journals Sheep nemabiome diversity and its response to anthelmintic treatment in Swedish sheep herds

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Peter Halvarsson ◽  
Johan Höglund
Keyword(s):  
Species Richness ◽  
Diversity Index ◽  
Nematode Species ◽  
Abundant Species ◽  
Anthelmintic Treatment ◽  
Host Age ◽  
Larval Culture ◽  
Nematode Parasites ◽  
South Central ◽  
Nematode Diversity

Abstract Background A novel way to study the species composition and diversity of nematode parasites in livestock is to perform deep sequencing on composite samples containing a mixture of different species. Herein we describe for the first time the nematode community structures (nemabiomes) inhabiting Swedish sheep and how these are/were affected by host age and recent anthelmintic treatments. Methods A total of 158 fecal samples were collected (n = 35 in 2007 and n = 123 in 2013–2016) and cultured from groups of sheep on 61 commercial farms in the south-central part of the country where most animals are grazed. Among the samples, 2 × 44 (56%) were paired collections from the same groups pre- and post-treatment with anthelmintics such as macrocyclic lactones, benzimidazoles or levamisole. Samples were analyzed for their nemabiome using the PacBio platform followed by bioinformatic sequence analysis with SCATA. Species richness and diversity were calculated and analyzed in R. Results Nematode ITS2 sequences were found in all larval culture samples except two, even though the fecal egg counts were below the McMaster threshold in 20 samples. Sequencing yielded, on average, 1008 sequences per sample. In total, 16 operational taxonomical units (OTU), all with ≥ 98 % identity to sequences in the NCBI database, were recognized. The OTUs found represented nematode species of which ten are commonly associated with sheep. Multiple species were identified in all pre-anthelmintic treatment larval culture samples. No effects on nematode diversity were found in relation to host age. On the other hand, recent anthelmintic treatment lowered species richness, especially after use of ivermectin and albendazole. Interestingly, despite zero egg counts after use of levamisole, these samples still contained nematode DNA and especially H. contortus. Conclusions Our findings provide evidence that nemabiome analysis combined with diversity index analysis provides an objective methodology in the study of the efficacy of anthelmintic treatment as both high and low abundant species were detected.

scholarly journals New host and distribution expansion for Pterygodermatites (Multipectines) affinis

2016 ◽  
Vol 53 (1) ◽  
pp. 81-86 ◽  
Author(s):  
N. P. Scioscia ◽  
P. M. Beldomenico ◽  
G. M. Denegri
Keyword(s):  
Buenos Aires ◽  
Buenos Aires Province ◽  
New Host ◽  
Fecal Samples ◽  
First Report ◽  
First Case ◽  
Small Intestines

SummaryThe present study reports the first case of infection by Pterygodermatites affinis in Lycalopex gymnocercus, and the first report of this nematode in Argentina. Examining 80 foxes from Buenos Aires province, specimens of this species were recovered from 21.25 % of the small intestines and eggs were found in 7.5 % of the fecal samples.

scholarly journals Capture efficiency for small dominant mesozooplankters (Copepoda, Appendicularia) off Buenos Aires Province (34ºS-41ºS), Argentine Sea, using two plankton mesh sizes

2009 ◽  
Vol 57 (3) ◽  
pp. 205-214 ◽  
Author(s):  
Rosana Di Mauro ◽  
Fabiana Capitanio ◽  
María Delia Viñas
Keyword(s):  
Buenos Aires ◽  
Developmental Stages ◽  
Fish Larvae ◽  
Abundant Species ◽  
Accurate Estimation ◽  
Buenos Aires Province ◽  
Oikopleura Dioica ◽  
Great Loss ◽  
Argentine Sea ◽  
Significant Difference

Two plankton mesh sizes of 67 µm and 220 µm were compared to evaluate their efficiency in the capture of the smallest copepods and appendicularians present in the Buenos Aires coastal area (Argentine Sea). A total of 12 copepod species and one appendicularian species were recorded in this study. The copepods were separated into 4 groups: harpacticoids, cyclopoids, small calanoids and large calanoids and their developmental stages. Among the cyclopoids, Oithona nana was the most abundant species, being 96.29 % underestimated by the 220 µm mesh, whereas Microsetella norvegica dominated the harpacticoids and was captured exclusively by the smaller mesh. Similar results were found for copepodites I-III of small calanoids, whose net sampled underestimation reached 99.70%. On the other hand, no significant difference between meshes was found for adults and copepodites IV-V of small calanoids or any of the developmental stages of large calanoids. A great loss of biomass was observed for O. nana when applying the larger mesh. In regards to the appendicularian Oikopleura dioica, all size ranges below 1,000 µm length were better estimated by the 67 µm mesh in terms of abundance and biomass. Our results clearly show that the 67 µm mesh was more efficient in the capture of early stages of small copepods thus providing a more accurate estimation of the fish larvae prey field.

scholarly journals South east villages in the province of Buenos Aires, an approach to the study of its population dynamics

Huellas ◽  
2019 ◽  
Vol 23 (2) ◽  
pp. 169-190
Author(s):  
Claudia Andrea Mikkelsen ◽  
◽  
Guillermo Ángel Velázquez ◽  
◽  
◽  
...  
Keyword(s):  
Population Dynamics ◽  
Buenos Aires
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