Distribution Patterns and Population Dynamics of the Micro-Arthropods of a Desert Soil in Southern California

10.2307/3470 ◽  
1972 ◽  
Vol 41 (2) ◽  
pp. 291 ◽  
Author(s):  
John A. Wallwork
Keyword(s):  
Population Dynamics ◽  
Southern California ◽  
Distribution Patterns ◽  
Desert Soil

scholarly journals Sixty-five years of northern anchovy population studies in the southern California Current: a review and suggestion for sensible management

2020 ◽  
Vol 77 (2) ◽  
pp. 486-499 ◽  
Author(s):  
William J Sydeman ◽  
Simon Dedman ◽  
Marisol García-Reyes ◽  
Sarah Ann Thompson ◽  
Julie A Thayer ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Southern California ◽  
Stock Assessment ◽  
California Current ◽  
Ecosystem Functions ◽  
Abundance Estimate ◽  
Harvest Control Rule ◽  
Northern Anchovy ◽  
Upwelling Intensity ◽  
Recovery Dynamics

Abstract The central stock of northern anchovy (CSNA; Engraulis mordax), the most abundant small pelagic fish in the southern California Current, is key to ecosystem functions. We review drivers of its population dynamics in relation to management. Springtime upwelling intensity lagged by 2 years co-varied positively with CSNA biomass, as did the abundance of Pacific sardine (Sardinops sagax; weakly negative). CSNA population dynamics indicate the need for a multi-species stock assessment, but given serious challenges with modelling population collapse and recovery dynamics, and its moderate fisheries, we suggest that sensible management could be a simple 2-tier harvest control rule designed to emphasize the key trophic role of CSNA in the ecosystem while maintaining moderate socio-economic services. We recommend a monitoring fishery of no more than 5 KMT year−1 split between central and southern California when the stock falls below the long-term median abundance estimate of 380 KMT across the California portion of its range, and a catch limit of 25 KMT year−1 when the stock is above this reference point. This rule would be precautionary, serving to maintain the most important small pelagic forage in the ecosystem, various fisheries interests, and information streams when the population is in a collapsed state.

scholarly journals Larval Population Dynamics of Culicoides variipennis (Diptera: Ceratopogonidae) in Southern California

1987 ◽  
Vol 24 (5) ◽  
pp. 566-574 ◽  
Author(s):  
Bradley A. Mullens ◽  
Keh-Shin Lip
Keyword(s):  
Population Dynamics ◽  
Southern California ◽  
Larval Population ◽  
Culicoides Variipennis

Radiolarian vertical distribution patterns across the Southern California current

1995 ◽  
Vol 42 (2) ◽  
pp. 191-231 ◽  
Author(s):  
Stanley A. Kling ◽  
Demetrio Boltovskoy
Keyword(s):  
Vertical Distribution ◽  
Southern California ◽  
California Current ◽  
Distribution Patterns

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.

Descriptions of species of Acrobeles von Linstow, 1877 (Nematoda, Rhabditida, Cephalobidae) from Kelso Dunes, Mojave National Preserve, California, USA

Zootaxa ◽  
2019 ◽  
Vol 4651 (2) ◽  
pp. 330-350
Author(s):  
SVEN BOSTRÖM ◽  
OLEKSANDR HOLOVACHOV
Keyword(s):  
Species Identification ◽  
Rare Species ◽  
Southern California ◽  
Distribution Patterns ◽  
Morphological Data ◽  
New Material ◽  
Type Population ◽  
National Preserve ◽  
First Time

Populations of three rare species of the genus Acrobeles are described from the Kelso Dunes area, Mojave National Preserve, southern California. One population is identified as belonging to A. undulatus and is compared with the type population from Venezuela and one population from Iran. Males of this species are described for the first time. Another population identified as belonging to A. ornatus is compared with the type population from Colorado, USA. Specimens identified as belonging to A. dimorphus are compared with the type population from Namibia. Descriptions of the new material add morphological data important for species identification, broaden the diagnosis of Acrobeles and increase the distribution patterns of these three species. 

Sign in / Sign up

Export Citation Format

Share Document