On the distribution patterns and population dynamics of sublittoral and profundal oligochaeta fauna from Lake Banyoles (Catalonia, NE Spain)

Hydrobiologia ◽  
1994 ◽  
Vol 278 (1-3) ◽  
pp. 139-149 ◽  
Author(s):  
M. Rieradevall ◽  
M. Real
Keyword(s):  
Population Dynamics ◽  
Distribution Patterns ◽  
Ne Spain

scholarly journals Shifting trends: Detecting changes in cetacean population dynamics in shifting habitat

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251522
Author(s):  
Charlotte Boyd ◽  
André E. Punt
Keyword(s):  
Population Dynamics ◽  
Population Size ◽  
Wildlife Conservation ◽  
Population Change ◽  
Stock Assessment ◽  
Distance Sampling ◽  
Distribution Patterns ◽  
Population Trend ◽  
Mobile Species ◽  
Population Size Estimates

The ability to monitor population dynamics and detect major changes in population trend is essential for wildlife conservation and management. However, this is often challenging for cetaceans as surveys typically cover only a portion of a population’s range and conventional stock assessment methods cannot then distinguish whether apparent changes in abundance reflect real changes in population size or shifts in distribution. We developed and tested methods for estimating population size and trend and detecting changes in population trend in the context of shifting habitat by integrating additional data into distance-sampling analysis. Previous research has shown that incorporating habitat information can improve population size estimates for highly mobile species with dynamic spatial distributions. Here, using simulated datasets representative of a large whale population, we demonstrate that incorporating individual mark-recapture data can increase the accuracy and precision of trend estimation and the power to distinguish whether apparent changes in abundance reflect changes in population trend or distribution shifts. We recommend that similar simulation studies are conducted for specific cetacean populations to assess the potential for detecting changes in population dynamics given available data. This approach is especially important wherever population change may be confounded with long-term change in distribution patterns associated with regime shifts or climate change.

Fruit dispersal of two dipterocarp species in a Malaysian rain forest

2001 ◽  
Vol 17 (6) ◽  
pp. 911-917 ◽  
Author(s):  
NORIYUKI OSADA ◽  
HIROSHI TAKEDA ◽  
AKIO FURUKAWA ◽  
MUHAMAD AWANG
Keyword(s):  
Population Dynamics ◽  
Seed Dispersal ◽  
Rain Forest ◽  
Distribution Patterns ◽  
Dispersal Patterns ◽  
Fruit Dispersal

Seed dispersal is the predominant mobile stage for sessile plants, and critically affects the distribution patterns of the species (Nathan & Muller-Landau 2000). Thus, seed dispersal patterns are important in understanding the population dynamics of the species.

Distribution patterns and population dynamics of the pandalid shrimp Plesionika izumiae (Decapoda, Caridea) in a unique semi-enclosed deep-water bay environment

Crustaceana ◽  
2018 ◽  
Vol 91 (9) ◽  
pp. 1073-1096 ◽  
Author(s):  
J. Ohtomi ◽  
F. Ahamed ◽  
M. Mosaddequr Rahman ◽  
H. Fukushima
Keyword(s):  
Population Dynamics ◽  
Deep Water ◽  
Seasonal Pattern ◽  
Maximum Size ◽  
Distribution Patterns ◽  
Catch Per Unit Effort ◽  
Bottom Water Temperature ◽  
History Of ◽  
Clear Shift ◽  
Steep Slopes

Abstract The pandalid shrimp Plesionika izumiae Omori, 1971 has a wide bathymetric distribution in the coastal waters and the upper continental slope of west Pacific regions. The distribution patterns and population dynamics of P. izumiae were studied in a unique semi-enclosed deep-water bay, Kagoshima Bay, southern Japan, with very steep slopes on both sides. Plesionika izumiae shows a wide spatial distribution in the bay with the majority of the individuals inhabiting the channel area with sediments of almost equal portions of silt and sand, as well as in the bay head with a silty sediment. There were no significant relationships between bottom water temperature or salinity and the distribution patterns of this shrimp, but the sediment characteristics and water depth might appear to influence the distribution patterns of P. izumiae. The distribution patterns with progression of age reveal the dynamics of the P. izumiae population, which was studied by selecting one cohort from each sex and tracing them throughout their life cycle, resulting in similar patterns being shown for both sexes. Juveniles (at the age of 5.7 months) occurred throughout the distribution areas; however, there was a low catch per unit effort (CPUE) even in the main spawning grounds, probably from due to the ongoing recruitment process. The substantial increment in CPUE at the age of 8.4 months throughout the distribution areas likely indicate the stock to be fully recruited by then. A clear shift in CPUE of these cohorts was observed at the ages of 11.6 months and 14.3 months, from the deeper areas towards the shallower areas of the bay, possibly suggesting spawning migration. Individuals approaching their maximum size and longevity were found mostly in the deeper waters. A marked seasonal pattern in CPUE was noted with higher values recorded in summer and lower in winter, which could possibly be related to the life history of the shrimp.

Distribution patterns and population dynamics of adult mosquitoes (diptera: culicidae) in southern israel

1987 ◽  
Vol 77 (3) ◽  
pp. 477-486 ◽  
Author(s):  
J. Margalit ◽  
Ch. Dimentman ◽  
J. Danon
Keyword(s):  
Population Dynamics ◽  
Species Composition ◽  
New Records ◽  
Mosquito Species ◽  
Distribution Patterns ◽  
Abundant Species ◽  
Total Catch ◽  
Spatial And Temporal Patterns ◽  
Aedes Detritus ◽  
First Time

AbstractThe species composition and population dynamics of mosquito adults trapped at 76 sites in southern Israel are described. Almost 200 000 specimens representing 23 species were collected. Five species, Aedes detritus (Haliday), Culiseta subochrea (Edwards), Culex antennatus (Becker), Cx. martinii Medschid and Cx. poicilipes (Theobald), are new records for this area, with Cx. poicilipes being recorded for the first time outside Africa. Six types of distribution patterns were discerned. The most abundant species was Cx. pipiens L. (79·7% of the total catch) followed by Ae. caspius (Pallas) (10%), Anopheles sergentii (Theobald) (2·1%), An. tenebrosus Dönitz (1·8%) and Cx. perexiguus Theobald (1·3%). All other species found each made up less than 1%. The spatial and temporal patterns of mosquito species in southern Israel are discussed.

Use of75Se tracer and autoradiographic techniques in the study of schistosomiasis

Parasitology ◽  
1988 ◽  
Vol 97 (3) ◽  
pp. 489-502 ◽  
Author(s):  
S. K. Chandiwana
Keyword(s):  
Population Dynamics ◽  
Natural Waters ◽  
Distribution Patterns ◽  
Quantitative Information ◽  
Laboratory Animals ◽  
Snail Population ◽  
Recovery Techniques ◽  
Transmission Ecology ◽  
Main Shortcoming ◽  
Host Tissues

SummaryThe paper provides an overview of recent studies on the use of75Se to tag larval schistosomes and to monitor their migration and distribution patterns in naive mice and those previously exposed to cercariae. The principles and techniques of radioassay and autoradiography in studying various aspects of75Se-labelled larval schistosomes are described. The main shortcoming of radioassay in monitoring location and movement of labelled schistosomula is that some of the label dissociates from the schistosomula and accumulates in host tissues, notably the liver. Dissociated label is indistinguishable from schistosomula-bound label making monitoring of parasite migration extremely difficult. This difficulty is overcome by compressed tissue autoradiography where labelled schistosomula can be seen as reduced silver foci on an autoradiographic film, whereas dissociated label is too diffusely distributed to produce such reduced silver foci. Furthermore, using autoradiography, quantitative information on parasite migration in normal and immunized laboratory animals can be obtained that would be impossible using traditional recovery techniques. In addition to using75Se tracer in migration studies, the radio-isotope has potential for elucidating various aspects of schistosome transmission ecology and snail population dynamics in natural waters.

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