Linking performance trait stability with species distribution: the case ofArtemisiaand its close relatives in northern China

2015 ◽  
Vol 27 (1) ◽  
pp. 123-132 ◽  
Author(s):  
Xuejun Yang ◽  
Zhenying Huang ◽  
David L. Venable ◽  
Lei Wang ◽  
Keliang Zhang ◽  
...  
Keyword(s):  
Species Distribution ◽  
Northern China ◽  
Performance Trait ◽  
Trait Stability ◽  
Close Relatives

Geographic pattern and effects of climate and taxonomy on nonstructural carbohydrates of Artemisia species and their close relatives across northern China

2015 ◽  
Vol 125 (3) ◽  
pp. 337-348 ◽  
Author(s):  
Xuejun Yang ◽  
Zhenying Huang ◽  
Keliang Zhang ◽  
J. Hans C. Cornelissen
Keyword(s):  
Northern China ◽  
Nonstructural Carbohydrates ◽  
Geographic Pattern ◽  
Artemisia Species ◽  
Close Relatives

Temporal distributions of microplankton populations and relationships to environmental conditions in Jiaozhou Bay, northern China

2012 ◽  
Vol 93 (1) ◽  
pp. 13-26 ◽  
Author(s):  
Yong Jiang ◽  
Henglong Xu ◽  
Mingzhuang Zhu ◽  
Khaled A.S. Al-Rasheid
Keyword(s):  
Species Distribution ◽  
Environmental Conditions ◽  
Environmental Changes ◽  
Temporal Dynamics ◽  
Skeletonema Costatum ◽  
Jiaozhou Bay ◽  
Northern China ◽  
Marine Ecosystems ◽  
Temporal Variations ◽  
Alexandrium Tamarense

To analyse temporal distributions of microplankton populations and relationships to environmental conditions in marine ecosystems, a dataset of microplankton communities was investigated using a range of statistical methods. A total of 164 microplankton species comprising 100 microalgae and 64 ciliates were identified from 120 samples, respectively. Both planktonic microalga and ciliate assemblages showed temporal patterns and were significantly correlated between their temporal variations in abundance. The microplankton communities were characterized by 14 ciliates (e.g. Strombidium sulcatum, Tintinnopsis tubulosoides and Strombidium cheshiri) and 18 microalgae (e.g. Skeletonema costatum and Alexandrium tamarense). Multiple regression analyses showed that the interspecies correlations among these dominant species represented a complex network with a clear seasonal shift. Temporal pattern of microplankton communities was significantly correlated with the environmental variables such as temperature, salinity and nitrate nitrogen. The results suggest the clear species distribution and temporal dynamics of microplankton communities in response to environmental changes, and multivariate statistical approaches were a useful tool to reveal the species distribution patterns and complex microplanktonic interspecies correlations in marine ecosystems.

Climatic effects on plant species distribution within the forest-steppe ecotone in northern China

2014 ◽  
Vol 18 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Hongyan Liu ◽  
Yi Yin ◽  
Qiuyi Wang ◽  
Siyuan He
Keyword(s):  
Plant Species ◽  
Species Distribution ◽  
Northern China ◽  
Forest Steppe ◽  
Climatic Effects

scholarly journals C:N:P stoichiometry ofArtemisiaspecies and close relatives across northern China: unravelling effects of climate, soil and taxonomy

2015 ◽  
Vol 103 (4) ◽  
pp. 1020-1031 ◽  
Author(s):  
Xuejun Yang ◽  
Zhenying Huang ◽  
Keliang Zhang ◽  
Johannes H. C. Cornelissen
Keyword(s):  
Northern China ◽  
C:N:P Stoichiometry ◽  
Close Relatives

scholarly journals A find of mollusks Watsonella crosbyi Grabau (Gastropoda: Helcionelliformes) in the Botomian of China

2019 ◽  
Vol 488 (6) ◽  
pp. 624-629
Author(s):  
P. Y. Parkhaev
Keyword(s):  
Species Distribution ◽  
Siberian Platform ◽  
Lower Cambrian ◽  
Northern China ◽  
Shaanxi Province ◽  
Time Range ◽  
Significant Time ◽  
Mollusk Species

The mollusk species Watsonella crosbyi Grabau, 1900 is found among other mollusks in the Lower Botomian strata of the Xinji Formation on the Northern China Platform (Shaanxi Province). Taxonomically the mollusks assemblage is extremely similar to those from the Mernmerna Formation, Parara Limestone, and Sellick Hill Formation of Southern Australia, Bastion Formation of Laurentia, and the uppermost Emyaksin Formation of the Siberian Platform. All these starta can be aged as Early Botomian. The new find of Watsonella crosbyi confirms the significant time range of the species distribution (Tommotian-Botomian) and raises doubts in newly proposed correlations of the Lower Cambrian of Southern Australia pushing down the previously determined age of the formations for one or even two ages older.

Epidendrum machinense (Orchidaceae: Laeliinae), a new species from Colombia

Phytotaxa ◽  
2020 ◽  
Vol 435 (1) ◽  
pp. 33-40
Author(s):  
MILTON RINCÓN-GONZÁLEZ ◽  
MARÍA FERNANDA ESCALANTE
Keyword(s):  
New Species ◽  
Species Distribution ◽  
Conservation Status ◽  
Central Andes ◽  
The Third ◽  
Close Relatives ◽  
A New Species

A new species of Epidendrum from central Andes of Colombia is described and illustrated. Epidendrum machinense belongs to the Mancum group, Stenoglossum subgroup; being only the third species known to belong to that subgroup. The new species is characterized by having larger plants with respect to its close relatives, bearing 50–80 flowers per inflorescence, the flowers are resupinate due to drooping of the rachis, rather than the twisting of the pedicel; the petals are 3–veined, yellow tinged purple-brown, with completely yellow apices, the lip is white with numerous wine-red spots, 3–lobed, with broadly hamate lateral lobes, and a mid-lobe with a rombic or bifid apex. Information on the species distribution, habitat and phenology, conservation status, and characters that distinguish it from the nearest species are provided, as well as an annotation on resupination in the Stenoglossum subgroup.

Species of the genus Sphaeronemoura (Plecoptera: Nemouridae) from continental China

Zootaxa ◽  
2009 ◽  
Vol 2004 (1) ◽  
pp. 59-64
Author(s):  
WEIHAI LI ◽  
DING YANG
Keyword(s):  
New Species ◽  
Northern China ◽  
Palaearctic Region ◽  
Fresh Material ◽  
Definition Of ◽  
Close Relatives ◽  
First Time ◽  
A New Species

The genus Sphaeronemoura is reported from the Palaearctic Region for the first time, accompanied with a new species added from northern China, Sphaeronemoura songshana sp. nov. Sphaeronemoura hamistyla (Wu, 1962) is redescribed and reillustrated for comparison based on the holotype and fresh material. Their relationships with close relatives are discussed. Unassociated females for one species are also described for further understanding of the genus under informal designation. Clarification or further definition of the generic characters and remarks on questions of Shimizu & Sivec (2001) are presented.

Assessing Person Fit With the Information Matrix Test

Methodology ◽  
2015 ◽  
Vol 11 (1) ◽  
pp. 3-12 ◽  
Author(s):  
Jochen Ranger ◽  
Jörg-Tobias Kuhn
Keyword(s):  
Simulation Study ◽  
Type I Error ◽  
Information Matrix ◽  
Small Samples ◽  
Type I ◽  
Person Fit ◽  
Power Of The Test ◽  
Order Expansion ◽  
Trait Stability ◽  
Information Matrix Test

In this manuscript, a new approach to the analysis of person fit is presented that is based on the information matrix test of White (1982) . This test can be interpreted as a test of trait stability during the measurement situation. The test follows approximately a χ2-distribution. In small samples, the approximation can be improved by a higher-order expansion. The performance of the test is explored in a simulation study. This simulation study suggests that the test adheres to the nominal Type-I error rate well, although it tends to be conservative in very short scales. The power of the test is compared to the power of four alternative tests of person fit. This comparison corroborates that the power of the information matrix test is similar to the power of the alternative tests. Advantages and areas of application of the information matrix test are discussed.

Social Integration of African international students in Northern China

2008 ◽  
Author(s):  
Lawani Ajibike Omolola
Keyword(s):  
International Students ◽  
Social Integration ◽  
Northern China
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