scholarly journals La vegetación del Valle de Tehuacán-Cuicatlán

2017 ◽  
pp. 25 ◽  
Author(s):  
Alfonso Valiente-Banuet ◽  
Alejandro Casas ◽  
Ariel Alcántara ◽  
Patricia Dávila ◽  
Noe Flores-Hernández ◽  
...  
Keyword(s):  
Environmental Gradients ◽  
Deciduous Forests ◽  
Aquatic Environments ◽  
Altitudinal Distribution ◽  
Species Dominance ◽  
Columnar Cacti ◽  
Plant Associations

The plant associations of the phytogeographic province of Tehuacán-Cuicatlán Valley are described and classified according to the species dominance and physiognomy based on field samplings of 500 m2. The altitudinal distribution of the associations was determined conducting 250 m2 samplings located every 100 m altitude in throughout five environmental gradients. A total of 29 plant associations were recognized including nine associations dominated by columnar cacti, four types of deciduous forests, three types of Izotal, and six type of shrublands. Mountainous arboreal vegetation includes five types of forests, as well as a Mountainous lzotal. The vegetation  associated to aquatic environments along rivers and springs include Galery forests and "Tulares". The pronounced heterogeneity of Tehuacan-Cuicatlán Valley determines the diversity and the distribution of the vegetation associations.

scholarly journals Plant Landscape and Models of French Atlantic Estuarine Systems. Extended Summary of the Doctoral Thesis

2021 ◽  
Vol 23 (1) ◽  
pp. 15-36
Author(s):  
Kevin Cianfaglione
Keyword(s):  
Predictive Model ◽  
Human Impacts ◽  
Environmental Gradients ◽  
Land Uses ◽  
Ecological Studies ◽  
Plant Associations ◽  
Vegetation Landscape ◽  
Estuarine Systems ◽  
Spatio Temporal ◽  
Vegetation Series

Abstract The present study proposes a theoretical common model of environmental gradients and functioning of vegetation and Plant Landscape of the French Atlantic estuarine systems. This model offers a basis to improve classification and ecological studies of estuarine systems, and to helps the monitoring and assessment of land uses, land forms transformation and human impacts, thanks to the develop of a spatio-temporal predictive model based on actual and potential vegetation following a dynamico-catenal approach. In eight selected estuaries, fieldworks was undertook for a total of 98,315 ha highlighting two vegetation series and four geopermaseries, corresponding to 131 plant associations, 60 alliances, 43 orders, and 28 classes. The vegetation of three representative estuaries was mapped, for a total of 74,433 ha. A synthetic scheme of estuary vegetation landscape is proposed, integrating geographical and ecological gradients as well as geomorphologic forms.

Diversity of Culicoides (Diptera: Ceratopogonidae) in Rural Settlements and Degraded Seasonal Deciduous Forests

2021 ◽  
Author(s):  
Maria da Conceição Abreu Bandeira ◽  
Allane Barros Cerqueira ◽  
Jorge Luiz Pinto Moraes ◽  
Reginaldo Peçanha Brazil ◽  
José Manuel Macário Rebêlo
Keyword(s):  
Deciduous Forests ◽  
Average Height ◽  
Degraded Forest ◽  
Rural Settlements ◽  
Natural Ecosystems ◽  
Natural Habitats ◽  
Biting Midges ◽  
Species Dominance ◽  
Rural Environments ◽  
Seasonal Forests

Abstract Biting midges are widespread in Brazilian natural ecosystems. However, deforestation and other activities that impact the environment are reducing natural habitats where biting midges proliferate. The objective of this study was to verify whether there is variation in the composition, richness, abundance, and seasonality of biting midges between wild and rural environments, in a forest area with intense deforestation. Biting midges were captured using 6 traps installed at an average height of 1.5 m in the peridomicile, intradomicile, and deciduous seasonal forests, once a month from May 2012 to April 2013. In total, 2,182 specimens of 13 species of the genus Culicoides were captured. Species richness was similar in the intradomicile (13 species), forest (12), and peridomicile (11), but species diversity was greater in the peridomicile (H’ = 0.803) compared with the intradomicile (H’ = 0.717) and forest (H’ = 0.687). The order of species dominance varied between the forest (Culicoides paucienfuscatus Barbosa > Culicoides leopodoi Ortiz > Culicoides foxi Ortiz > Culicoides ignacioi Forattini) and peridomicile + intradomicile habitats (C. paucienfuscatus > C. foxi > C. filariferus Hoffman > C. ignacioi). The activity of these dipterans was strongly influenced by meteorological variables, as biting midges are predominant in the rainy season (80.7% of specimens), when higher rainfall, relative humidity, and lower temperatures prevail. The abundance of biting midges was higher in the peridomicile + intradomicile (83.7% of specimens) compared with the degraded forest (16.3%), a result that reflects the loss of forest habitat due to intense and progressive deforestation.

Classification of birch forests of southern and middle taiga of the Komi Republic. I. Betuleta Herbosa

2001 ◽  
pp. 3-37 ◽  
Author(s):  
S. V. Degteva
Keyword(s):  
Komi Republic ◽  
Birch Forest ◽  
Middle Taiga ◽  
Herb Layer ◽  
Forest Types ◽  
Species Dominance ◽  
Plant Associations ◽  
Birch Forests

As a result of classification of the Komi Republic birch forests (within the southern and middle taiga subzones) the 5 birch forest types (grass, feathermoss, hairmoss, grass-peatmoss, and peatmoss), which are considered systems of associations in given type of habitat were distinguished. The birch stands of the grass type are considered in the present paper. The 16 plant associations are distinguished and characterized on the basis of species dominance in the herb layer and the combination of ecological-phytocoenotic groups of correlated species.

scholarly journals Spring weed communities of rice agrocoenoses in central Nepal

2016 ◽  
Vol 75 (1) ◽  
pp. 99-108 ◽  
Author(s):  
Arkadiusz Nowak ◽  
Sylwia Nowak ◽  
Marcin Nobis
Keyword(s):  
Rice Field ◽  
Habitat Preferences ◽  
Altitudinal Distribution ◽  
Central Nepal ◽  
Plant Associations ◽  
Weed Communities ◽  
Phytosociological Relevés ◽  
Discrimination Factors ◽  
Water Vegetation

AbstractRice field weed communities occurring in central Nepal are presented in this study. The research was focussed on the classification of segetal plant communities occurring in paddy fields, which had been poorly investigated from a geobotanical standpoint. In all, 108 phytosociological relevés were sampled, using the Braun-Blanquet method. The analyses classified the vegetation into 9 communities, including 7 associations and one subassociation. Four new plant associations and one new subassociation were proposed: Elatinetum triandro-ambiguae, Mazo pumili-Lindernietum ciliatae, Mazo pumili-Lindernietum ciliatae caesulietosum axillaris, Rotaletum rotundifoliae and Ammanietum pygmeae. Due to species composition and habitat preferences all phytocoenoses were included into the Oryzetea sativae class and the Ludwigion hyssopifolio- octovalvis alliance. As in other rice field phytocoenoses, the main discrimination factors for the plots are depth of water, soil trophy and species richness. The altitudinal distribution also has a significant influence and separates the Rotaletum rotundifoliae and Elatinetum triandro-ambiguae associations. The study shows that anthropogenic rice fields can harbour relatively rich rush and water vegetation. More than 80 species were noted in the vegetation plots. Several of them are considered to be extremely rare and have been recorded on the world Red List.

Revision of the Pantomorus albosignatus species group (Coleoptera: Curculionidae: Entiminae) from Mexico and Central America

Zootaxa ◽  
2020 ◽  
Vol 4819 (3) ◽  
pp. 557-570
Author(s):  
ANALIA A. LANTERI ◽  
MARIA GUADALUPE DEL RIO
Keyword(s):  
El Salvador ◽  
Species Group ◽  
Deciduous Forests ◽  
Pine Forests ◽  
Cloud Forests ◽  
Southern Mexico ◽  
Line Drawings ◽  
Plant Associations ◽  
Dichotomous Key ◽  
Tropical Deciduous Forests

Pantomorus albosignatus Boheman, 1840 (Entiminae: Naupactini), type species of the genus Pantomorus Schoenherr, 1840, is broadly distributed in Mexico, from Oaxaca and Veracruz to Chihuahua and Coahuila, and is probably related to P. parvulus Sharp 1891 (México: Oaxaca and Veracruz), P. andersoni sp. nov. (México: Guerrero), and P. crinitus (Boheman, 1840) (southern Mexico, El Salvador and Guatemala). The four species are small (5-8 mm), apterous, usually show a characteristic maculation and erect setae on the elytra, short antennae, vestigial to absent humeri, and well-developed, squamose corbels of the metatibiae, and are here referred to as the Pantomorus albosignatus species group. Our study was based on the examination of type material and about 500 specimens from different collections, and provides a dichotomous key, descriptions or redescriptions of the species, habitus photographs, line drawings of female and male genitalia, a map of distribution, new locality records and new plant associations. We propose that Pantomorus nobilis (Boheman 1840) is a new junior subjective synonym of P. crinitus (Boheman, 1840), and we designate lectotypes for the species Pantomorus albosignatus Boheman, P. parvulus Sharp, P. crinitus (Boheman), P. nobilis (Boheman) and P. affinis Sharp, 1891 (the latter is also a junior synonym of P. crinitus). Pantomorus albosignatus usually inhabits Acacia grasslands and cactus deserts of the Mexican Plateau, at higher elevations than remaining species; P. parvulus occurs in cloud forests and tropical deciduous forests of southern Mexico; P. crinitus in open oak pine forests, cloud forests and tropical deciduous forests of southern Mexico, Guatemala and El Salvador; and P. andersoni is endemic to the state of Guerrero, in Acacia-cactus woodlands.

Altitudinal distribution of bats in the Pol’ana Mts area (Central Slovakia)

Biologia ◽  
2006 ◽  
Vol 61 (5) ◽  
Author(s):  
Peter Kaňuch ◽  
Anton Krištín
Keyword(s):  
Species Number ◽  
Altitudinal Distribution ◽  
Species Dominance ◽  
Ecological Adaptations ◽  
Nyctalus Leisleri ◽  
Myotis Daubentonii ◽  
Reproductive Females ◽  
The Individual ◽  
Eptesicus Serotinus ◽  
Occurrence Of Species

AbstractIn May — August, bats were mist-netted along an altitudinal gradient of 350–1350 m a.s.l. in the Pol’ana Mts area, to verify the correlation of species number decrease and the increase in elevation, to find which species could be predictors of certain altitude levels and to compare the sexual occurrence of species in various altitudes. Seventeen bat species were recorded. The most abundant mist-netted species were Myotis daubentonii (16%), M. myotis (13%) and M. mystacinus (12%). Otherwise, the most frequently caught species were M. mystacinus (40%), Eptesicus serotinus, M. myotis (26%) and Nyctalus leisleri (23%). In this study at a local scale, from oak to spruce vegetation stages, decreasing number of species with increasing altitude was found. Species dominance of the individual altitudinal levels was significantly different (15 species up to 600 m a.s.l., six species over 1100 m a.s.l.). The results indicated that the occurrence of some bat species, due to their ecological adaptations, is more or less characteristic for higher or lower altitudes of the Western Carphathians. The “lowland” species were considered to be mainly E. serotinus, Pipistrellus pipistrellus, N. noctula, N. leisleri and M. daubentonii. In higher elevations (more than 850 m), the presence of reproductive females was not found, of all but one, N. noctula, of the “lowland” species which are breeding in the area. The “mountain” species were considered to be E. nilssonii and Plecotus auritus. The general occurrence and reproduction of M. mystacinus and Barbastella barbastellus, was not limited by elevation.

scholarly journals Phytoplankton Density and Diversity in the Waters around the Reclamation Area in Manado Beach

2013 ◽  
Vol 1 (3) ◽  
pp. 109
Author(s):  
Yulianti E Liwutang ◽  
Fransine B. Manginsela ◽  
Jan FWS Tamanampo
Keyword(s):  
Organic Matter ◽  
Aquatic Organisms ◽  
Diversity Indices ◽  
The Body ◽  
Aquatic Environments ◽  
Phytoplankton Species ◽  
Species Dominance ◽  
Reclamation Area ◽  
Ecological Parameters ◽  
Dominance Indices

ABSTRACT Phytoplankton is one of the most important aquatic organisms and has a major role in the cycle of life in the waters. Phytoplankton is able to do the process of photosynthesis to produce the organic matter utilized by other organisms living in aquatic environments. Phytoplankton can also be used as one of the ecological parameters that can describe the ecological conditions of the body of water and can be used as bio-indicators of pollution in the water. The purpose of this study is to obtain the types of phytoplankton in the waters around the reclamation area in Manado Beach, to know the diversity and density of phytoplankton species, and to determine the types of phytoplankton which are dominant according to the water depth. The phytoplankton found in the research site belonged to 27 genera. Station 1, 27 species were found in 5m depth, 19 species in 15m depth and 12 species in 30m depth. Station 2, 24 species were found in 5m depth, 20 species in 15m depth and 13 species in 30m depth. For index density, station 1 and 2 at a depth of 5 m has the highest density of 11 individuals/l and 12.333 Individuals/l. Diversity indices for stations 1 and 2 showed at a depth of 5 m, 2.954 and 2.891, respectively. The dominance indices at station 1 and station 2 showed that were no species dominance. Keywords : phytoplankton, density, diversity, reclamation area   ABSTRAK Fitoplankton  merupakan salah satu organisme perairan yang sangat penting dan mempunyai peran utama dalam siklus kehidupan di  perairan. Fitoplankton mampu melakukan proses fotosintesis untuk menghasilkan senyawa organik yang merupakan sumber energi yang dimanfaatkan oleh organisme lain yang hidup di lingkungan perairan. Fitoplankton juga dapat digunakan sebagai salah satu parameter ekologi yang dapat menggambarkan bagaimana kondisi ekologi suatu perairan dan dapat digunakan sebagai bio-indikator pencemaran dalam suatu perairan. Penelitian ini bertujuan untuk mendapatkan data jenis-jenis fitoplankton yang ada di perairan sekitar kawasan reklamasi Pantai Manado, mengetahui keanekaragaman dan kepadatan spesies fitoplankton dan mengetahui jenis-jenis fitoplankton yang dominan menurut kedalaman air. Jenis fitoplankton yang ditemukan di lokasi penelitian totalnya berjumlah 27 genus.   Stasiun 1, ditemukan 27 spesies di kedalaman 5m, 19 spesies di kedalaman 15m dan 12 spesies di kedalaman 30m. Stasiun 2, ditemukan 24 spesies di kedalaman 5m, 20 spesies di kedalaman 15m dan 13 spesies di kedalaman 30m.Untuk indeks kepadatan, stasiun 1 dan 2 di kedalaman 5 m memiliki kepadatan tertinggi yaitu 11 Ind/l dan 12,333 Ind/l. Indeks keanekaragaman untuk stasiun 1 dan 2 di kedalaman 5m yaitu 2,954 dan 2,891, indeks dominasi di stasiun 1 dan stasiun 2 menunjukkan tidak adanya dominasi spesies. Kata kunci : fitoplankton, kepadatan, keanekaragaman, kawasan reklamasi 1Bagian dari skripsi 2Mahasiswa Program Studi Manajemen Sumberdaya Perairan FPIK-UNSRAT 3Staf pengajar Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi

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