Seasonal Changes in the Meiofauna Population of an Intertidal Sand Beach

1972 ◽  
Vol 52 (2) ◽  
pp. 389-403 ◽  
Author(s):  
Roger P. Harris
Keyword(s):  
Seasonal Changes ◽  
Population Based ◽  
Sand Beach ◽  
Intertidal Sand ◽  
Regular Sampling ◽  
Total Meiofauna

In spite of the increasing interest in the ecology of interstitial meiofauna (Fenchel, Jansson & Thun, 1967; Gray & Rieger, 1971;Jansson, 1968; Renaud-Debyser, 1963; Renaud-Debyser & Salvat, 1963; Schmidt, 1968,1969) little is known about the seasonal changes that occur in interstitial populations. A number of seasonal studies have been made of groups within the meiofauna–for example, tardigrades (Pollock, 1970) and nematodes (Skoolmun & Gerlach, 1971). However, Schmidt (1968, 1969) provides the only information for a total meiofauna population based on regular sampling over a complete year's cycle.

scholarly journals Seasonal Changes in Lung Function in a Farming Population

2000 ◽  
Vol 7 (4) ◽  
pp. 320-325 ◽  
Author(s):  
Ambikaipakan Senthilselvan ◽  
James A Dosman ◽  
Karen M Semchuk ◽  
Helen H McDuffie ◽  
Allan J Cessna ◽  
...  
Keyword(s):  
Pulmonary Function ◽  
Seasonal Changes ◽  
Pesticide Exposure ◽  
Respiratory Health ◽  
Longitudinal Design ◽  
Winter Season ◽  
Occupational Exposures ◽  
Population Based ◽  
Forced Expiratory Volume ◽  
Farm Residents

OBJECTIVE:To assess the changes in respiratory health from winter to summer seasons in a rural population.DESIGN:A longitudinal design was used in the study.SETTING:A population-based study was conducted as part of the Environmental Pesticide Exposure and Human Health component of the Prairie Ecosystem Study (PECOS) in southwestern Saskatchewan.PATIENTS:In the winter season, 358 patients participated in the study. Of these patients, 234 returned for the second assessment during the summer season. After excluding 34 children aged 17 years and under, 200 adult patients were available for analysis.MEASUREMENTS:Questionnaires were used to obtain information on demographic factors, smoking habits, occupational and environmental exposures, and respiratory conditions. Pulmonary function measurements were obtained using a volume displacement spirometer.RESULTS:Mean ages (± SD) of the 106 men and 94 women participating in the study were 50.1±13.3 and 49.0±13.1 years, respectively. Mean percentage changes in maximal midexpiratory flow rate from winter to summer assessments indicated an improvement for town residents and a decline for farm residents. Mean percentage changes in the ratio of forced expiratory volume in 1 s to forced vital capacity indicated an improvement for town residents who were not engaged in farming, and increasing declines for town residents engaged in farming, farm residents not engaged in farming and farm residents engaged in farming.CONCLUSIONS:Seasonal changes occurred in measurements of pulmonary function between winter and summer seasons; these changes may be related to the environmental or occupational exposures experienced by the participants during the study.

Life Histories and Breeding Patterns of Three Intertidal Sand Beach Isopods

1991 ◽  
Vol 12 (2) ◽  
pp. 105-121 ◽  
Author(s):  
AN M. C. DE Ruyck ◽  
Theodore E. Donn ◽  
Anton McLachlan
Keyword(s):  
Life Histories ◽  
Sand Beach ◽  
Intertidal Sand

Molluscan assemblages on an intertidal sandflat in Princess Royal Harbour, Westren Austrailia

1980 ◽  
Vol 31 (4) ◽  
pp. 499 ◽  
Author(s):  
FE Wells ◽  
D Roberts
Keyword(s):  
Rocky Shores ◽  
Sand Beach ◽  
Sandy Shores ◽  
Intertidal Sand ◽  
Intertidal Zonation ◽  
Tide Level ◽  
Intertidal Sandflat ◽  
Molluscan Fauna ◽  
Zonation Patterns

The molluscan fauna of an intertidal sand beach in Princess Royal Harbour, W.A.. is divided into two associations. The upper association, located between +0.10 and +0.59 m relative to tidal datum, is characterized by Hydrococcus graniformis and Batillariella estuarina. The lower assemblage, between +0.09 and -0.29 m is dominated numerically by Zeacumantus diemenensis and Katelysia scalarina. The assemblages are equivalent to the midlittoral- and sublittoral-fringe groupings described on both sandy and rocky shores by other authors. There is no supralittoral-fringe component in the molluscan fauna ofprincess Royal Harbour. The break between the two assemblages occurs at + 0.1 m, just below the minimum tide level in the area. Possible reasons for the zonation patterns are discussed and compared with other studies of intertidal zonation on sandy shores.

Horizontal and Vertical Distribution of the Interstitial Harpacticoid Copepods of a Sandy Beach by Roger

1972 ◽  
Vol 52 (2) ◽  
pp. 375-387 ◽  
Author(s):  
P. Harris
Keyword(s):  
Vertical Distribution ◽  
Physical Environment ◽  
Seasonal Changes ◽  
Sandy Beach ◽  
Subsequent Paper ◽  
Vertical Zonation ◽  
Sand Beach ◽  
Harpacticoid Copepods ◽  
Copepod Population ◽  
Horizontal And Vertical Distribution

In a previous paper (Harris, 1972) the meiofauna of an exposed sand beach at Whitsand Bay, Cornwall, was described in relation to the physical environment. During this study special emphasis was placed on the harpacticoid copepods, of which 13 species were recorded on the beach. In the present paper the horizontal and vertical zonation of the copepod species on the beach is described. An account of seasonal changes in the copepod population will be given in a subsequent paper.

scholarly journals Factors affecting seasonal changes in blood pressure in North India: A population based four-seasons study

2018 ◽  
Vol 70 (3) ◽  
pp. 360-367 ◽  
Author(s):  
Abhishek Goyal ◽  
Naved Aslam ◽  
Shaminder Kaur ◽  
R.K. Soni ◽  
Vandana Midha ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Seasonal Changes ◽  
Population Based ◽  
North India ◽  
Factors Affecting ◽  
Four Seasons

scholarly journals Using movement behaviour to define biological seasons for woodland caribou

Rangifer ◽  
2012 ◽  
Vol 32 (2) ◽  
pp. 295 ◽  
Author(s):  
Tyler D. Rudolph ◽  
Pierre Drapeau
Keyword(s):  
Seasonal Changes ◽  
Polynomial Regression ◽  
Population Based ◽  
Mixed Effects ◽  
Movement Behaviour ◽  
Temporal Window ◽  
Data Set ◽  
Pooled Data ◽  
Terrestrial Mammals ◽  
Sample Quantiles

Terrestrial mammals are strongly influenced by seasonal changes in environmental conditions. Studies of animal space use behaviour are therefore inherently seasonal in nature. We propose an individual-based quantitative method for identifying seasonal shifts in caribou movement behaviour and we demonstrate its use in determining the onset of the winter, spring dispersal, and calving seasons. Using pooled data for the population we demonstrate an alternate approach using polynomial regression with mixed effects. We then compare individual onset dates with population-based estimates and those adopted by expert consensus for our study area. Distributions of individual-based onset dates were normally distributed with prominent modes; however, there was considerable variation in individual onset times. Population-based estimates were closer to the peaks of individual estimates than were expert-based estimates, which fell outside the onetailed 90% and 95% sample quantiles of individually-fitted distributions for spring and winter, respectively. Both expertand population-based estimates were later for winter and earlier for both spring and calving than were individual-based estimates. We discuss the potential consequences of neglecting to corroborate conventionally used dates with observed seasonal trends in movement behaviour. In closing, we recommend researchers adopt an individual-based quantitative approach and a variable temporal window for data set extraction.

The activity of three intertidal sand beach isopods (flabellifera: cirolanidae)

1991 ◽  
Vol 146 (2) ◽  
pp. 163-180 ◽  
Author(s):  
An M.C. De Ruyck ◽  
Anton McLachlan ◽  
Theodore E. Donn
Keyword(s):  
Sand Beach ◽  
Intertidal Sand
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