scholarly journals Size composition and seasonal changes in abundance of juvenile sole, Solea solea, in the Severn Estuary and Inner Bristol Channel

1987 ◽  
Vol 67 (3) ◽  
pp. 561-569 ◽  
Author(s):  
P. N. Claridge ◽  
I. C. Potter
Keyword(s):  
Body Size ◽  
Relative Abundance ◽  
Seasonal Changes ◽  
Size Composition ◽  
Marine Species ◽  
Severn Estuary ◽  
Resultant Data ◽  
Solea Solea ◽  
The Times ◽  
Seasonal Data

During a period of five years in the mid-1970s, fish were collected at weekly intervals from the Severn Estuary and Bristol Channel. The resultant data on the abundance and lengths of these fish have provided valuable information on the times when the juveniles of several marine species are recruited into the estuary and on their pattern of growth during the first years of life (Claridge & Gardner, 1977; Titmus, Claridge & Potter, 1978; Claridge & Potter, 1983, 1984, 1985; Potter & Claridge, 1985). One of the marine species found in the Severn Estuary for which no seasonal data on density or body size have been presented is the sole, Solea solea (L.), whose relative abundance ranked it amongst the top ten species in two of the five years of our study (Claridge, Potter & Hardisty, 1986).

scholarly journals Structure of three subtropical bat assemblages (Chiroptera) in the Andean rainforests of Argentina

Mammalia ◽  
2016 ◽  
Vol 80 (1) ◽  
Author(s):  
Mariano S. Sánchez
Keyword(s):  
Species Richness ◽  
Relative Abundance ◽  
Seasonal Changes ◽  
Common Species ◽  
Guild Structure ◽  
Trophic Guild ◽  
Long Tail ◽  
Mist Net ◽  
Yungas Forests

AbstractI evaluated bat assemblages in terms of species richness, relative abundance, trophic guild structure, and seasonal changes at three sites along of the Southern Yungas forests. A total of 854 individuals were captured, representing 25 species of three families, with an effort of 27,138 m of mist net opened per hour. Subtropical assemblages showed a similar structure to those from tropical landmark, with a dominance of frugivorous Phyllostomid; in addition, a few species were abundant, followed by a long tail of less common species. However, subtropical sites differed due to the dominance of the genus

scholarly journals Associations between Childhood Body Size, Composition, Blood Pressure and Adult Cardiac Structure: The Fels Longitudinal Study

PLoS ONE ◽  
2014 ◽  
Vol 9 (9) ◽  
pp. e106333 ◽  
Author(s):  
Roy T. Sabo ◽  
Miao-Shan Yen ◽  
Stephen Daniels ◽  
Shumei S. Sun
Keyword(s):  
Blood Pressure ◽  
Body Size ◽  
Longitudinal Study ◽  
Size Composition ◽  
Cardiac Structure

The Swift Fox in Rangeland and Cropland in Western Kansas: Relative Abundance, Mortality, and Body Size

2000 ◽  
Vol 45 (2) ◽  
pp. 221 ◽  
Author(s):  
Raymond S. Matlack ◽  
Philip S. Gipson ◽  
Donald W. Kaufman
Keyword(s):  
Body Size ◽  
Relative Abundance ◽  
Swift Fox

Occurrence and relative abundance of mosquitoes in stormwater retention facilities in North Carolina, USA

2006 ◽  
Vol 54 (6-7) ◽  
pp. 315-321 ◽  
Author(s):  
W.F. Hunt ◽  
C.S. Apperson ◽  
S.G. Kennedy ◽  
B.A. Harrison ◽  
W.G. Lord
Keyword(s):  
North Carolina ◽  
Relative Abundance ◽  
Seasonal Changes ◽  
Stormwater Management ◽  
Biological Diversity ◽  
Mosquito Species ◽  
Structural Complexity ◽  
Different Types ◽  
Retention Structures ◽  
Stormwater Retention

Throughout the 2004 mosquito season, 52 stormwater retention facilities were sampled to characterize the seasonal occurrence and relative abundance of mosquito species in relation to the structural complexity and biological diversity of the facilities. The three different types of facilities included standard wet ponds (n=20), innovative ponds (n=14), and wetland ponds (n=18). All retention structures were sampled at the beginning, middle and end of the mosquito season so that seasonal changes in mosquito production could be characterized. Overall samplings, mosquitoes were collected from 34% of the retention structures. Fourteen species representing 7 genera were collected, but only 5 species (Culex erraticus, Cx. territans, Anophelesquadrimaculatus, An. punctipennis and Uranotaenia sapphirina) were commonly collected in all three types of stormwater management facilities. In general, the seasonal prevalence and relative abundance of mosquito species did not vary among three types of retention structures. A significant association (P<0.01) between the presence of mosquito larvae or pupae and the absence of mosquitofish was found for innovative and wetland stormwater retention facilities but not for standard retention facilities (P>0.05).

Seasonal Distribution and Abundance of Dugongs in the Western-Gulf-of-Carpentaria

1989 ◽  
Vol 16 (2) ◽  
pp. 141 ◽  
Author(s):  
P Bayliss ◽  
WJ Freeland
Keyword(s):  
Relative Density ◽  
Relative Abundance ◽  
Coastal Waters ◽  
Seasonal Changes ◽  
Aboriginal People ◽  
Dry Season ◽  
Seasonal Distribution ◽  
Wet Season ◽  
Aerial Surveys ◽  
The 1960S

Aerial surveys of coastal waters (27 216 km2) in the western Gulf of Carpentaria during the dry season of 1984 and wet season of 1985 indicated no major seasonal changes in distribution and relative abundance of dugongs. Minimum population size in the dry season was estimated as 16 816 � 2946 (standard error), with a relative density of 0.62 k 0.11 km-2, and that for the wet season 16 846 + 3257, with a relative density of 0.62 � 0.12 km-2. The estimates exclude 5% of observations which could have been either dugongs or Irrawaddy dolphins, and were corrected for submerged dugongs and those missed on the surface. Dugongs were unevenly distributed over the study area, and neither mean group size nor proportion of calves varied between seasons. Dugong abundance was correlated with area of available seagrass. The catch rate of dugongs by Aboriginal people off Numbulwar decreased six-fold between the 1960s and 1985 (60 to 10 p.a.), possibly due to excessive hunting.

scholarly journals Seasonal changes in body size and oil sac volume of three planktonic copepods, Paracalanus parvus (Claus, 1863), Pseudocalanus newmani Frost, 1989 and Oithona similis Claus, 1866, in a temperate embayment: what controls their seasonality?

Crustaceana ◽  
2014 ◽  
Vol 87 (3) ◽  
pp. 364-375 ◽  
Author(s):  
Daichi Arima ◽  
Atsushi Yamaguchi ◽  
Yoshiyuki Abe ◽  
Kohei Matsuno ◽  
Rui Saito ◽  
...  
Keyword(s):  
Body Size ◽  
Seasonal Changes ◽  
Primary Energy ◽  
Specific Pattern ◽  
Peak Period ◽  
Oithona Similis ◽  
Warm Summer ◽  
Cold Spring ◽  
Species Specific ◽  
Paracalanus Parvus

Seasonal changes in body size (prosome length: PL) and oil sac volume (OSV) of the three most numerically abundant copepods in Ishikari Bay, northern Sea of Japan, Paracalanus parvus (Claus, 1863), Pseudocalanus newmani Frost, 1989 and Oithona similis Claus, 1866, were studied using monthly samples collected through vertical hauls of a 100-μm mesh NORPAC net from March, 2001 to May, 2002. Seasonal changes in PL were common for the three species and were more pronounced during a cold spring. PL was negatively correlated with temperature, and this relationship was described well using the Bělehrádek equation. Seasonal changes in OSV exhibited a species-specific pattern, i.e., OSV was greater during a warm summer for P. parvus and was greater during a cold spring for P. newmani and O. similis. The OSV peak period corresponded with the optimal thermal season of each species. The relative OSV to prosome volume of the small copepods (0.6-0.8%) was substantially lower than that of the large copepods (20-32%). These facts suggest that the oil sac of small copepods is not used for overwintering or diapauses or during periods of food scarcity, but is instead used as the primary energy source for reproduction, which occurs during the optimum thermal season of each species.

Body size, energetics, and the Ordovician restructuring of marine ecosystems

Paleobiology ◽  
2008 ◽  
Vol 34 (3) ◽  
pp. 342-359 ◽  
Author(s):  
Seth Finnegan ◽  
Mary L. Droser
Keyword(s):  
Body Size ◽  
Relative Abundance ◽  
Late Ordovician ◽  
Depositional Environments ◽  
Data Set ◽  
Widespread Occurrence ◽  
Trade Offs ◽  
Shallow Subtidal ◽  
Ecological Dominance ◽  
Benthic Ecosystems

Major shifts in ecological dominance are one of the most conspicuous but poorly understood features of the fossil record. Here we examine one of the most prominent such shifts, the Ordovician shift from trilobite to brachiopod dominance of benthic ecosystems. Using an integrated database of high-resolution paleoecological samples and body size data, we show that while the average local richness and relative abundance of trilobites declined significantly through the Ordovician, the estimated standing biomass of trilobites, and by implication the amount of energy that they used, remained relatively invariant. This is attributable to an increase in the average body size of trilobite species in our data set, and especially to the widespread occurrence of the exceptionally large Middle-Late Ordovician trilobite genus Isotelus. Brachiopods increase in both mean body size and relative abundance throughout the Ordovician, so that estimates of brachiopod biomass and energetic use increase substantially between the Early and Late Ordovician. Although the data set includes a range of depositional environments, similar trends are observed in both shallow subtidal and deep subtidal settings. These results suggest that diversification of the Paleozoic Fauna did not come at the energetic expense of the Cambrian Fauna. The declining relative abundance of trilobites may reflect a combination of numerical dilution and the necessary energetic trade-offs between body size and abundance.

scholarly journals Seasonal Changes in the Ovary of the Immature Hake, Merlucius merluccius L.

1935 ◽  
Vol 20 (2) ◽  
pp. 443-461 ◽  
Author(s):  
C. F. Hickling
Keyword(s):  
Seasonal Variation ◽  
Seasonal Change ◽  
Relative Abundance ◽  
Seasonal Changes ◽  
Average Diameter ◽  
Ovarian Cycle ◽  
Growth Rings ◽  
Skeletal Structures ◽  
Somatic Tissues ◽  
Spawning Cycle

A seasonal variation is found in the ovaries of immature hake (Merlucius merluccius L.).There appears to be a seasonal change in the rate at which young eggs are formed from resting oocytes, as indicated (1) by the change in the relative abundance of nuclei in synapsis, and (2) by the change in the average diameter of the eggs in the egg-stock in the ovary. These processes show considerable correspondence in their season of incidence with the ovarian cycle of the mature and adolescent fish.A physiological rhythm has now been detected in both somatic tissues and gonad in the immature hake, which foreshadows the physiological rhythm associated with the spawning cycle in the mature hake. The implication of this on the question of the formation of “growth-rings” in the skeletal structures is briefly discussed.

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