Oligochaetes from six tropical crater lakes in Central Mexico: species composition, density and biomass

AbstractBelow-ground herbivores have been poorly studied regardless of their importance for the establishment and composition of plant communities. In a subalpine grassland associated with a 3200-m-elevation pine forest in central Mexico, the composition and vertical and horizontal distribution of the macroarthropod root-feeding community was studied for 14 months. The root-feeding community included six species of Coleoptera and one species of Diptera. The dominant species were Phyllophaga spp. (subgenus Phytallus, "macrophylla" group) and Trachyploeomimus aff. spurcus Champion. Mean density and biomass of this community were 101 individuals and 3 g per square metre, respectively. These values were low when compared with those reported for other communities. Species were most abundant in the first 10 cm of the soil all year around. Dominant species showed a clumped horizontal distribution most of the year.

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The macrozoobenthos under clam farm (the Black Sea, Sevastopol region)

Marine Biological Journal ◽

10.21072/mbj.2018.03.1.02 ◽

2018 ◽

Vol 3 (1) ◽

pp. 9-22 ◽

Cited By ~ 1

Author(s):

N. A. Boltacheva ◽

M. V. Makarov ◽

L. V. Bondarenko ◽

M. A. Kovaleva

Keyword(s):

Species Diversity ◽

Species Composition ◽

Black Sea ◽

Rare Species ◽

Trophic Structure ◽

Bivalve Mollusk ◽

The Black Sea ◽

Density And Biomass

During 2015–2106 the macrozoobenthos under the clam farm located in the area of Sevastopol was investigated. The aim of the study is to consider species composition, density and biomass of macrozoobenthos in the area of the clam farm. The samples were taken using standard benthic techniques. Relatively low species diversity was observed, with 56 species of macrozoobenthos identified. The density was 500–975 ind. per m², the biomass varied from 0.8 to 381.1 g·m-2. The community of the bivalve mollusk Lucinella divaricata (Linnaeus, 1758) was found. Trophic structure of the community with high quantity of detritus feeders dominated by small polychaetes was determined. The dominating, typical and rare species were identified. Comparison with the data obtained in 1957 in Evpatoriya – Sevastopol area at the same depths and sediments was made.

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Current status and variation trend of seagrass beds in coastal water of Son Tra peninsula, Da Nang city

Tạp chí Khoa học và Công nghệ Biển ◽

10.15625/1859-3097/16405 ◽

2021 ◽

Vol 21 (2) ◽

pp. 183-189

Author(s):

Hoa Nguyen Xuan ◽

Nhu Thuy Nguyen Nhat ◽

Hieu Nguyen Trung

Keyword(s):

Species Composition ◽

Coastal Water ◽

Shoot Density ◽

Current Status ◽

Seagrass Beds ◽

Variation Trend ◽

Halophila Ovalis ◽

Density And Biomass ◽

Size And Structure

Species composition of seagrasses in coastal water of Son Tra peninsula was less diverse, with three species identified. Halophila ovalis was dominant. The seagrass beds are mainly distributed in Bai Nom and Bai But, with a total area of about 1 ha. The seagrass beds had been seriously degraded in both size and structure. Approximately 9 ha of seagrass beds (90% of total area) disappeared compared with data of 2005. Halophila ovalis had only been distributed at a depth of 2–3 m. Coverage, shoot density, and biomass of seagrass beds had also decreased.

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Cosmocerca acanthurum n. sp. (Nematoda: Cosmocercidae) in Pseudoeurycea leprosa and Chiropterotriton orculus from the Transmexican Volcanic Belt, Central Mexico, with a checklist of the helminth parasites of plethodontid salamanders

Zootaxa ◽

10.11646/zootaxa.1434.1.2 ◽

2007 ◽

Vol 1434 (1) ◽

pp. 27 ◽

Cited By ~ 6

Author(s):

J. FALCÓN-ORDAZ ◽

J. C. WINDFIELD-PÉREZ ◽

B. MENDOZA-GARFIAS ◽

G. PARRA-OLEA ◽

G. PÉREZ-PONCE DE LEÓN

Keyword(s):

Life History ◽

Species Composition ◽

Parasite Species ◽

Volcanic Belt ◽

Helminth Parasite ◽

Central Mexico ◽

Helminth Parasites ◽

Evolutionary Diversification ◽

Plethodontid Salamanders ◽

Host Parasite

Plethodontid salamanders represent a group of amphibians that show a great evolutionary diversification in México, however no study of their helminth parasites had been conducted thus far. In this paper, we describe Cosmocerca acanthurum n. sp. (Nematoda: Cosmocercidae) from the intestine of the plethodontid salamanders Pseudoeurycea leprosa and Chiropterotriton orculus from Llano Grande and Texcalyacac, Estado de México, in Central México. Cosmocerca acanthurum n. sp. is easily distinguished from all other species of Cosmocerca in that females possess a uniquely spined tail, a character no seen in congeners. In addition, we compiled all the information of helminth parasites of plethodontid salamanders, and we present it in the form of a checklist of both parasite-host, and host-parasite. A brief analysis of the helminth parasite species composition is presented regarding life-history and development characteristics of plethodontids.

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Structural Organization and Species Composition of a Lotic Periphyton Community in Response to Experimental Acidification

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f89-104 ◽

1989 ◽

Vol 46 (5) ◽

pp. 827-835 ◽

Cited By ~ 24

Author(s):

Dolors Planas ◽

Louise Lapierre ◽

Guy Moreau ◽

Martine Allard

Keyword(s):

Community Structure ◽

Species Composition ◽

Cell Density ◽

Structural Organization ◽

Spatial Organization ◽

Algal Cell ◽

Periphyton Community ◽

Experimental Acidification ◽

Density And Biomass ◽

And Control

Changes in species composition, richness, diversity, biomass (biovolume), and spatial community structure of a lotic periphyton community were observed under experimental acidification (mean pH 4.5) with and without aluminum, in troughs fed from an oligo-dystrophic creek (mean pH 6.7). in experimental and control troughs, the community was dominated by diatoms throughout the treatment. Achnanthes linearis was dominant in all troughs before treatment as well as in the control during the experiment. Eunotia pectinalis, which was rare in all troughs before treatment, became dominant in the acidified troughs. After 3 mo of acidification, algal cell density and biomass were respectively 30 and 40–70 times higher in the treated troughs as compared with that in the control. The Sow diversity (H = 1.45–2.30) characteristic of the control trough, increased to 3.3 in the treated troughs after 1 mo of acidification, but after 3 mo of experiment the diversity was slightly lower in experimental troughs. In the control trough, spatial organization of the community was characterized by monolayered arrangements during the whole experiment, in both acidified troughs (acid and acid plus aluminum) the community became multilayered (3–4 layers). The increased complexity of the community in the acidified troughs seemed to be related to a decrease in the abundance of grazers in the periphytic community, mainly the collector–gatherers Ephemeroptera and Orthocladiinae.

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Local adaptation in populations of a Brachionus group plicatilis cryptic species inhabiting three deep crater lakes in Central Mexico

Freshwater Biology ◽

10.1111/j.1365-2427.2012.02738.x ◽

2012 ◽

Vol 57 (4) ◽

pp. 728-740 ◽

Cited By ~ 22

Author(s):

JOSÉ ARTURO ALCÁNTARA-RODRÍGUEZ ◽

JORGE CIROS-PÉREZ ◽

ELIZABETH ORTEGA-MAYAGOITIA ◽

CARMEN R. SERRANIA-SOTO ◽

ELÍAS PIEDRA-IBARRA

Keyword(s):

Cryptic Species ◽

Local Adaptation ◽

Central Mexico ◽

Crater Lakes

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Comments on cladocerans of crater lakes of the Nevado de Toluca Volcano (Central Mexico), with the description of a new species, Alona manueli sp. nov.

Zootaxa ◽

10.11646/zootaxa.3647.2.10 ◽

2013 ◽

Vol 3647 (2) ◽

pp. 390 ◽

Cited By ~ 7

Author(s):

ARTEM Y. SINEV ◽

EDYTA ZAWISZA

Keyword(s):

New Species ◽

Central Mexico ◽

Crater Lakes ◽

Nevado De Toluca ◽

A New Species

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Radiocarbon Dating of Underwater Archaeological Objects from the Nevado de Toluca, Mexico

Radiocarbon ◽

10.1017/rdc.2017.106 ◽

2017 ◽

Vol 59 (6) ◽

pp. 1705-1712 ◽

Cited By ~ 3

Author(s):

M A Martínez-Carrillo ◽

C Solís ◽

I Hernández Bautista ◽

R Junco Sánchez ◽

M Rodríguez-Ceja ◽

...

Keyword(s):

Radiocarbon Dating ◽

Central Mexico ◽

Crater Lakes ◽

Spanish Conquest ◽

Long Duration ◽

Toluca Valley ◽

Nevado De Toluca ◽

Archaeological Objects ◽

La Luna

ABSTRACTThe Nevado de Toluca is a stratovolcano located in the southwest of the Toluca Valley in central Mexico. At a height of around 4200 m there are two crater lakes: El Sol and La Luna. Since Precolumbian times, people in the surrounding valleys carried out rituals and deposited offerings into the lakes. After the Spanish conquest, these rituals were kept alive clandestinely. Currently, reminiscent of Mesoamerican rituals subsist. Due to the long duration of the ritual at the Nevado de Toluca, it is important to date the materials recovered in the underwater and terrestrial archaeological explorations. This article proposes a chronology of Prehispanic ritual activities performed in the Nevado de Toluca based on the characterization and radiocarbon (14C) dating performed to materials from the volcano’s lakes.

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Recovery and succession of epiphytes in upper Amazonian fallows

Journal of Tropical Ecology ◽

10.1017/s0266467406003580 ◽

2006 ◽

Vol 22 (6) ◽

pp. 705-717 ◽

Cited By ~ 31

Author(s):

Ana-Maria Benavides ◽

Jan H. D. Wolf ◽

Joost F. Duivenvoorden

Keyword(s):

Species Richness ◽

Species Composition ◽

National Park ◽

Species Turnover ◽

Age Effect ◽

Forest Age ◽

Canonical Ordination ◽

Density And Biomass ◽

Lowland Amazonia

The species richness, number of plants, biomass, and species composition of holo- and hemi-epiphytes were recorded in fifty-six 0.04-ha plots, distributed over forest fallows of 2–30 y old and mature forests in lowland Amazonia (Amacayacu National Park, Colombia). A total of 9190 epiphytic plants representing 162 species were recorded on 4277 phorophytes. Seventy species were classified as holo-epiphyte and 85 as hemi-epiphyte. Aroids were most diverse (58 species) and represented 76% of the total recorded biomass. Anemochory was more dominant among holo-epiphytes and zoochory among hemi-epiphytes. The species richness, density and biomass of both holo- and hemi-epiphytes increased significantly from young fallows to old fallows and mature forests. Hemi-epiphytes had greater density and biomass than holo-epiphytes. In canonical ordination, forest age did not relate to the species composition of holo-epiphytes. However, for hemi-epiphytes, the age effect was significant, suggesting that species turnover takes place in the ageing fallows.

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Diversity of segetal weeds in pea (Pisum sativum L.) depending on crops chosen for a crop rotation system

Acta Agrobotanica ◽

10.5586/aa.2014.008 ◽

2014 ◽

Vol 67 (1) ◽

pp. 55-66 ◽

Cited By ~ 1

Author(s):

Marta K. Kostrzewska ◽

Magdalena Jastrzębska ◽

Kinga Treder ◽

Maria Wanic

Keyword(s):

Species Diversity ◽

Species Composition ◽

Crop Rotation ◽

Spring Barley ◽

Chenopodium Album ◽

Research Station ◽

Weed Species ◽

Rotation System ◽

Density And Biomass ◽

Dominance Indices

This study, lasting from 1999 to 2006, was conducted at the Research Station in Tomaszkowo, which belongs to the University of Warmia and Mazury in Olsztyn. The experiment was set up on brown rusty soil classified as good rye complex 5 in the Polish soil valuation system. The analysis comprised weeds in fields sown with pea cultivated in two four-field crop rotation systems with a different first crop: A. potato – spring barley – pea – spring barley; B. mixture of spring barley with pea – spring barley – pea – spring barley. Every year, at the 2–3 true leaf stage of pea, the species composition and density of individual weed species were determined; in addition, before harvesting the main crop, the dry matter of weeds was weighed. The results were used to analyze the constancy of weed taxa, species diversity, and the evenness and dominance indices, to determine the relationships between all biological indicators analyzed and weather conditions, and to calculate the indices of similarity, in terms of species composition, density and biomass of weeds, between the crop rotations compared.The species richness, density and biomass of weeds in fields with field pea were not differentiated by the choice of the initial crop in a given rotation system. In the spring, the total number of identified taxa was 28 and it increased to 36 before the harvest of pea plants. Chenopodium album and Echinochloa crus-galli were the most numerous. Chenopodium album, Echinochloa crus-galli, Sonchus arvensis, Fallopia convolvulus and Viola arvensis were constant in all treatments, regardless of what the first crop in rotation was or when the observations were made.The species diversity and the evenness and species dominance indices varied significantly between years and dates of observations. Species diversity calculated on the basis of the density of weed species was higher in the rotation with a mixture of cereals and legumes, while that calculated on the basis of weed biomass was higher in the system with potato. The similarity indices, which express the convergence of floristic composition as well as of the density and biomass of weeds growing in pea fields in the two crop rotation systems compared, were within a broad range (42–86%). The biodiversity of weed communities was more closely correlated to total precipitation than to air temperature.

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