Influence of stream characteristics and population size on downstream transport of freshwater mollusk environmental DNA

2020 ◽  
Author(s):  
Bernhard C Stoeckle ◽  
S Beggel ◽  
R Kuehn ◽  
Juergen Geist
Keyword(s):  
Population Size ◽  
Environmental Dna ◽  
Freshwater Mollusk ◽  
Stream Characteristics

scholarly journals Seasonal variation in environmental DNA in relation to population size and environmental factors

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Andrew S. Buxton ◽  
Jim J. Groombridge ◽  
Nurulhuda B. Zakaria ◽  
Richard A. Griffiths
Keyword(s):  
Seasonal Variation ◽  
Environmental Factors ◽  
Population Size ◽  
Environmental Dna

Statistical Processing of Different Sounds of Vocalizing Fish and Mammals to Estimate Their Population Size With Two Acoustic Sensors

2019 ◽  
Vol 53 (4) ◽  
pp. 68-80 ◽  
Author(s):  
Shaik Asif Hossain ◽  
Monir Hossen
Keyword(s):  
Population Size ◽  
Statistical Processing ◽  
Environmental Dna ◽  
Marine Species ◽  
Statistical Signal Processing ◽  
Fish Population ◽  
Processing Technique ◽  
Population Estimation ◽  
Human Interaction ◽  
Signal Processing Technique

AbstractFish and mammals have an enormous impact on marine ecosystems. A proper estimation of their population size is necessary, not only for their ecological values but also for commercial purposes. Most conventional techniques for estimating fish population are visual sampling techniques, the environmental DNA (eDNA) technique, minnow traps, the removal method of population estimation, and echo integration techniques, all of which are sometimes complex and costly, require human interaction, and can be harmful for marine species. In order to overcome these limitations, in this paper, a passive acoustic fishery monitoring technique is proposed as an alternative. The method is based on a statistical signal processing technique called “cross-correlation” and different types of sounds—namely, chirps, grunts, growls, clicks, and so forth—produced by fish and mammals. Our goal was not only to propose an efficient technique for fish population estimation but also to measure its performance for different fish sounds by using numerical simulations. From the analyses of simulated results, we found that the chirp sound-generating species produced better results than the other two types of sound-generating species—the grunt- and growl-generating species.

Reduction of spermatogonia and testosterone in rat testes flown on space lab-3

1986 ◽  
Vol 44 ◽  
pp. 248-249
Author(s):  
Delbert E. Philpott ◽  
W. Sapp ◽  
C. Williams ◽  
T. Fast ◽  
J. Stevenson ◽  
...  
Keyword(s):  
Social Interaction ◽  
Social Status ◽  
Population Size ◽  
Physiological Response ◽  
Social Rank ◽  
Reproductive Function ◽  
Testicular Development ◽  
Organ Weights ◽  
Reproductive Maturation ◽  
Metabolic Activities

Space Lab 3 (SL-3) was flown on Shuttle Challenger providing an opportunity to measure the effect of spaceflight on rat testes. Cannon developed the idea that organisms react to unfavorable conditions with highly integrated metabolic activities. Selye summarized the manifestations of physiological response to nonspecific stress and he pointed out that atrophy of the gonads always occurred. Many papers have been published showing the effects of social interaction, crowding, peck order and confinement. Flickinger showed delayed testicular development in subordinate roosters influenced by group numbers, social rank and social status. Christian reported increasing population size in mice resulted in adrenal hypertrophy, inhibition of reproductive maturation and loss of reproductive function in adults. Sex organ weights also declined. Two male dogs were flown on Cosmos 110 for 22 days. Fedorova reported an increase of 30 to 70% atypical spermatozoa consisting of tail curling and/or the absence of a tail.

Estimating Population Size and the Number of Duplicates on Two Lists Based only on Birth Dates

2013 ◽  
Author(s):  
Eugene Laska ◽  
Morris Meisner ◽  
Carole Siegel
Keyword(s):  
Population Size

Effective population size of the critically endangered east Australian grey nurse shark Carcharias taurus

2019 ◽  
Vol 610 ◽  
pp. 137-148 ◽  
Author(s):  
S Reid-Anderson ◽  
K Bilgmann ◽  
A Stow
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Critically Endangered ◽  
Effective Population ◽  
Nurse Shark ◽  
Carcharias Taurus

Channel Pattern Variability and Stream Characteristics: A Study of Tulsi and Bhogawati River using Geoinformatics

2011 ◽  
Vol 4 (7) ◽  
pp. 253-255
Author(s):  
Jagdish B Sapkale ◽  
◽  
Vidya A Chougule
Keyword(s):  
Channel Pattern ◽  
Stream Characteristics ◽  
Pattern Variability

An Artificial Immune System with Feedback Mechanisms for Effective Handling of Population Size

2010 ◽  
Vol E93-A (2) ◽  
pp. 532-541 ◽  
Author(s):  
Shangce GAO ◽  
Rong-Long WANG ◽  
Masahiro ISHII ◽  
Zheng TANG
Keyword(s):  
Immune System ◽  
Population Size ◽  
Artificial Immune System ◽  
Artificial Immune ◽  
Feedback Mechanisms
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