Ecological Studies of Aquatic Insects: Size of Respiratory Organs in Relation to Environmental Conditions

Ecology ◽  
1924 ◽  
Vol 5 (3) ◽  
pp. 262-271 ◽  
Author(s):  
G. S. Dodds ◽  
Frederick L. Hisaw
Keyword(s):  
Environmental Conditions ◽  
Aquatic Insects ◽  
Ecological Studies

Ecological Studies on Aquatic Insects. III. Adaptations of Caddisfly Larvae to Swift Streams

Ecology ◽  
1925 ◽  
Vol 6 (2) ◽  
pp. 123-137 ◽  
Author(s):  
G. S. Dodds ◽  
Frederick L. Hisaw
Keyword(s):  
Aquatic Insects ◽  
Ecological Studies ◽  
Caddisfly Larvae

scholarly journals ECOLOGICAL STUDIES OF THE WHITE ROOT ROT OF LOQUAT TREES (2) THE RELATION BETWEEN THE ENVIRONMENTAL CONDITIONS AND THE INFECTION

1966 ◽  
Vol 12 ◽  
pp. 117-119
Author(s):  
Ryoh-ichi OHGUSHI ◽  
Takahiko OHTA ◽  
Toshikatsu NISHINO ◽  
Tsuyuji HIRANO
Keyword(s):  
Environmental Conditions ◽  
Root Rot ◽  
Ecological Studies ◽  
White Root Rot

scholarly journals Seed Dormancy Class and Ecophysiological Features of Veronicastrum sibiricum (L.) Pennell (Scrophulariaceae) Native to the Korea Peninsula

Plants ◽  
2022 ◽  
Vol 11 (2) ◽  
pp. 160
Author(s):  
Gyeong Ho Jang ◽  
Jae Min Chung ◽  
Yong Ha Rhie ◽  
Seung Youn Lee
Keyword(s):  
Seed Dormancy ◽  
Environmental Conditions ◽  
Laboratory Experiments ◽  
Mature Embryo ◽  
Cold Stratification ◽  
Perennial Species ◽  
Ecological Studies ◽  
Mass Propagation ◽  
Important Data ◽  
Physiological Dormancy

Veronicastrum sibiricum is a perennial species distributed in Korea, Japan, Manchuria, China, and Siberia. This study aimed to determine the requirements for germination and dormancy break of V. sibiricum seeds and to classify the kind of seed dormancy. Additionally, its class of dormancy was compared with other Veronicastrum and Veronica species. V. sibiricum seeds were permeable to water and had a mature embryo during seed dispersal. In field conditions, germination was prevented by physiological dormancy, which was, however, relieved by March of the next year, allowing the start of germination when suitable environmental conditions occurred. In laboratory experiments, the seeds treated with 0, 2, 4, 8, and 12 weeks of cold stratification (4 °C) germinated to 0, 79, 75, 72, and 66%, respectively. After the GA3 treatment (2.887 mM), ≥90% of the seeds germinated during the four incubation weeks at 20/10 °C. Thus, 2.887 mM GA3 and at least two weeks at 4 °C were effective in breaking physiological dormancy and initiating germination. Therefore, the V. sibiricum seeds showed non-deep physiological dormancy (PD). Previous research, which determined seed dormancy classes, revealed that Veronica taxa have PD, morphological (MD), or morphophysiological seed dormancy (MPD). The differences in the seed dormancy classes in the Veronicastrum-Veronica clade suggested that seed dormancy traits had diverged. The results provide important data for the evolutionary ecological studies of seed dormancy and seed-based mass propagation of V. sibiricum.

scholarly journals Molecular characterization reveals the complexity of previously overlooked coral-exosymbiont interactions and the implications for coral-guild ecology

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
H. Rouzé ◽  
M. Leray ◽  
H. Magalon ◽  
L. Penin ◽  
P. Gélin ◽  
...  
Keyword(s):  
Coral Reefs ◽  
Environmental Conditions ◽  
New Caledonia ◽  
Coral Host ◽  
Cryptic Diversity ◽  
Pocillopora Damicornis ◽  
Ecological Studies ◽  
Functional Roles ◽  
Associated Species ◽  
Interaction Webs

Abstract Several obligate associate crabs and shrimps species may co-occur and interact within a single coral host, leading to patterns of associations that can provide essential ecological services. However, knowledge of the dynamics of interactions in this system is limited, partly because identifying species involved in the network remains challenging. In this study, we assessed the diversity of the decapods involved in exosymbiotic assemblages for juvenile and adult Pocillopora damicornis types α and β on reefs of New Caledonia and Reunion Island. This approach revealed complex patterns of association at regional and local scales with a prevalence of assemblages involving crab-shrimp partnerships. Furthermore, the distinction of two lineages in the snapping shrimp Alpheus lottini complex, rarely recognized in ecological studies, reveals a key role for cryptic diversity in structuring communities of mutualists. The existence of partnerships between species that occurred more commonly than expected by chance suggests an increased advantage for the host or a better adaptation of associated species to local environmental conditions. The consideration of cryptic diversity helps to accurately describe the complexity of interaction webs for diverse systems such as coral reefs, as well as the functional roles of dominant associated species for the persistence of coral populations.

scholarly journals A review of the methods used for studies on parasitic fungi in natural plant communities

2014 ◽  
Vol 32 (2) ◽  
pp. 323-346
Author(s):  
Wiesław Mułenko
Keyword(s):  
Plant Communities ◽  
Environmental Conditions ◽  
Plant Density ◽  
Essential Element ◽  
Plant Distribution ◽  
Ecological Studies ◽  
Natural Plant ◽  
Parasitic Fungi ◽  
Total Information ◽  
Host Application

The purpose of this paper is to reconsider the methods used so Tar and to propose standardization of studies on the microparasitic fungi in natural plant communities. The method should meet the following requirements: demonstration of the relationships between the pathogen and host, application in different environmental conditions. enabling repetition of studies at different limes. giving comparable results. The object of the discussion is to search for such study procedures which give a total information about the occurrence of phytopathological fungi and their hosts in natural plant communities. This concerns, among other things. the following problems: estimation of the frequency of fungi. their distribution, the infection degree of their hosts as well as analysis of the occurrence of fungi in relation to plant distribution. The degree of plant density is an important factor determining the appearance of the disease and its evaluation should be an inseparable element in analysis of parasitism. The mycological-ecological studies, using permanent study areas seems to be indispensable. Research plots need not be literally permanent. Here, a system of permanent. precisely localized points can be used which allow each time reconstruction of areas determined carlier. The most essential element of such studies is to provide for oneself (and future researchers) repeatability of studies. i.e. return lo the same places and taking samples from the same areas.

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