Seasonal Changes in Body Size and Male Genital Structures of Procladius choreus (Diptera: Chironomidae: Tanypodinae)

1998 ◽  
Vol 20 (3) ◽  
pp. 165-172 ◽  
Author(s):  
Tadashi Kobayashi
Keyword(s):  
Body Size ◽  
Seasonal Changes ◽  
Male Genital

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.

scholarly journals Is body size important? Seasonal changes in morphology in two grass-feeding Abacarus mites

2017 ◽  
Vol 72 (4) ◽  
pp. 317-328 ◽  
Author(s):  
Alicja Laska ◽  
Brian G. Rector ◽  
Lechosław Kuczyński ◽  
Anna Skoracka
Keyword(s):  
Body Size ◽  
Seasonal Changes

scholarly journals Evolution of sexual dimorphism and Rensch’s rule in the beetle genusLimnebius(Hydraenidae): is sexual selection opportunistic?

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3060 ◽  
Author(s):  
Andrey Rudoy ◽  
Ignacio Ribera
Keyword(s):  
Sexual Selection ◽  
Body Size ◽  
General Pattern ◽  
Strong Support ◽  
Male Body ◽  
Rensch’S Rule ◽  
Male Body Size ◽  
Rensch's Rule ◽  
The Individual ◽  
Male Genital

Sexual size dimorphism (SSD) is widespread among animals, with larger females usually attributed to an optimization of resources in reproduction and larger males to sexual selection. A general pattern in the evolution of SSD is Rensch’s rule, which states that SSD increases with body size in species with larger males but decreases when females are larger. We studied the evolution of SSD in the genusLimnebius(Coleoptera, Hydraenidae), measuring SSD and male genital size and complexity of ca. 80% of its 150 species and reconstructing its evolution in a molecular phylogeny with 71 species. We found strong support for a higher evolutionary lability of male body size, which had an overall positive allometry with respect to females and higher evolutionary rates measured over the individual branches of the phylogeny. Increases in SSD were associated to increases in body size, but there were some exceptions with an increase associated to changes in only one sex. Secondary sexual characters (SSC) in the external morphology of males appeared several times independently, generally on species that had already increased their size. There was an overall significant correlation between SSD, male body size and male genital size and complexity, although some lineages with complex genitalia had low SSD, and some small species with complex genitalia had no SSD. Our results suggest that the origin of the higher evolutionary variance of male body size may be due to lack of constraints rather than to sexual selection, that may start to act in species with already larger males due to random variation.

scholarly journals Seasonal changes in the body size of two rotifer species living in activated sludge follow the Temperature‐Size Rule

2014 ◽  
Vol 4 (24) ◽  
pp. 4678-4689 ◽  
Author(s):  
Anna Kiełbasa ◽  
Aleksandra Walczyńska ◽  
Edyta Fiałkowska ◽  
Agnieszka Pajdak‐Stós ◽  
Jan Kozłowski
Keyword(s):  
Body Size ◽  
Activated Sludge ◽  
Seasonal Changes ◽  
The Body ◽  
Rotifer Species

Seasonal changes in body size, sexual size dimorphism and sex ratio in relation to mating system in an adult odonate community

2010 ◽  
Vol 25 (1) ◽  
pp. 59-75 ◽  
Author(s):  
Jesús Wong-Muñoz ◽  
Alex Córdoba-Aguilar ◽  
Raúl Cueva del Castillo ◽  
Martín A. Serrano-Meneses ◽  
John Payne
Keyword(s):  
Body Size ◽  
Sex Ratio ◽  
Mating System ◽  
Seasonal Changes ◽  
Sexual Size Dimorphism ◽  
Size Dimorphism

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).

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