scholarly journals Hydrology, environment and ecological evolution of Lake Baiyangdian since 1960s

2020 ◽  
Vol 32 (5) ◽  
pp. 1333-1347
Author(s):  
YI Yujun ◽  
◽  
LIN Chuqiao ◽  
TANG Caihong
Keyword(s):  
Ecological Evolution ◽  
Lake Baiyangdian

scholarly journals Have Niche, Will Travel. New Means of Linking Diet and Ecomorphology Reveals Niche Conservatism in Freshwater Cottoid Fishes

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
T J Buser ◽  
D L Finnegan ◽  
A P Summers ◽  
M A Kolmann
Keyword(s):  
Niche Conservatism ◽  
Freshwater Species ◽  
Evolutionary Transitions ◽  
Adaptive Diversification ◽  
Functional Aspects ◽  
Ecological Evolution ◽  
Jaw Apparatus ◽  
Cottoid Fishes ◽  
Freshwater Habitats ◽  
Dietary Niche

Synopsis Evolutionary transitions between habitats have been catalysts for some of the most stunning examples of adaptive diversification, with novel niches and new resources providing ecological opportunity for such radiations. In aquatic animals, transitions from saltwater to freshwater habitats are rare, but occur often enough that in the Neotropics for example, marine-derived fishes contribute noticeably to regional ichthyofaunal diversity. Here, we investigate how morphology has evolved in a group of temperate fishes that contain a marine to freshwater transition: the sculpins (Percomorpha; Cottoidea). We devised a novel method for classifying dietary niche and relating functional aspects of prey to their predators. Coupled with functional measurements of the jaw apparatus in cottoids, we explored whether freshwater sculpins have fundamentally changed their niche after invading freshwater (niche lability) or if they retain a niche similar to their marine cousins (niche conservatism). Freshwater sculpins exhibit both phylogeographical and ecological signals of phylogenetic niche conservatism, meaning that regardless of habitat, sculpins fill similar niche roles in either saltwater or freshwater. Rather than competition guiding niche conservatism in freshwater cottoids, we argue that strong intrinsic constraints on morphological and ecological evolution are at play, contra to other studies of diversification in marine-derived freshwater fishes. However, several intertidal and subtidal sculpins as well as several pelagic freshwater species from Lake Baikal show remarkable departures from the typical sculpin bauplan. Our method of prey categorization provides an explicit, quantitative means of classifying dietary niche for macroevolutionary studies, rather than relying on somewhat arbitrary means used in previous literature.

Adsorption Characteristic Research of Sediments of Lake Baiyangdian

2014 ◽  
Vol 511-512 ◽  
pp. 55-58
Author(s):  
Zhe Qin ◽  
Qian Wang ◽  
Zheng Liu
Keyword(s):  
Adsorption Isotherm ◽  
Nitrogen Adsorption ◽  
Ammonia Nitrogen ◽  
Langmuir Adsorption Isotherm ◽  
Adsorption Characteristic ◽  
Langmuir Adsorption ◽  
Lake Baiyangdian ◽  
Object Of Study ◽  
Total Maximum ◽  
Adsorption Quantity

This paper regarded the sediments of Lake Baiyangdian as the object of study, researched and analyzed ammonia nitrogen adsorption characteristics of sediment samples. The results showed that: the sediments adsorption to ammonia nitrogen reached a state of equilibrium after 2.5h, The ammonia nitrogen adsorption rate was maximum in 0~10min. Sediment adsorption of ammonia nitrogen was higher as ammonia nitrogen liquid balance concentration increased. The adsorption isotherm curve of ammonia nitreogen can be fitted well by the Langmuir adsorption isotherm model. The total maximum adsorption quantity of ammonia nitrogen by the sediments of Lake Baiyangdian is between 54.12mg/kg to 240.12mg/kg.

scholarly journals Preface

1965 ◽  
Vol 249 (759) ◽  
pp. 258-258
Keyword(s):  
Geographical Distribution ◽  
Endemic Species ◽  
Scientific Interest ◽  
Ecological Stability ◽  
Ecological Balance ◽  
Tristan Da Cunha ◽  
Ecological Evolution ◽  
Gough Island ◽  
Island Group

The four islands of the Tristan da Cunha-Gough Island group are very isolated. They contain a unique fauna and flora. Knowledge of these is very incomplete in important respects. Such knowledge could not only help towards understanding the origins of the geographical distribution of plants and animals, it could also throw valuable light on the factors governing colonization of isolated regions. But it is not only the unique biota which is of scientific interest in these islands. We have here a natural ecological balance between the endemic species of an impoverished and therefore simple fauna and flora. Such islands could thus allow us to study with comparative ease the factors which control ecological stability; a study of the great importance to mankind today. Moreover, fortunately there have now been found in these islands evidence of datable remains of the geologically recent biota, so that there is a reasonable chance that we shall one day be able to trace the ecological evolution in time.

Studies in the Ecological Evolution of the Angiosperms.J. W. Bews

1929 ◽  
Vol 87 (2) ◽  
pp. 326-327
Author(s):  
H. C. Cowles
Keyword(s):  
Ecological Evolution

scholarly journals Emergent structure in a stochastic model of ecological evolution

2019 ◽  
Vol 401 ◽  
pp. 129-133 ◽  
Author(s):  
Ty N.F. Roach ◽  
James Nulton ◽  
Paolo Sibani ◽  
Forest Rohwer ◽  
Peter Salamon
Keyword(s):  
Stochastic Model ◽  
Ecological Evolution ◽  
Emergent Structure
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