The Body Size-Population Density Relationship in Tropical Rocky Intertidal Communities

10.2307/5949 ◽  
1997 ◽  
Vol 66 (4) ◽  
pp. 557 ◽  
Author(s):  
Sergio A. Navarrete ◽  
Bruce A. Menge
Keyword(s):  
Body Size ◽  
Population Density ◽  
The Body ◽  
Rocky Intertidal ◽  
Intertidal Communities ◽  
Density Relationship ◽  
Size Population

Scaling Population Density to Body Size in Rocky Intertidal Communities

Science ◽  
1990 ◽  
Vol 250 (4984) ◽  
pp. 1125-1127 ◽  
Author(s):  
P. A. Marquet ◽  
S. A. Navarrete ◽  
J. C. Castilla
Keyword(s):  
Body Size ◽  
Population Density ◽  
Rocky Intertidal ◽  
Intertidal Communities

Regional analysis of body size and population density in stream fish assemblages: testing predictions of the energetic equivalence rule

2002 ◽  
Vol 59 (8) ◽  
pp. 1350-1360 ◽  
Author(s):  
Jason H Knouft
Keyword(s):  
Body Size ◽  
Population Density ◽  
Density Distribution ◽  
Fish Assemblages ◽  
The Body ◽  
Bergmann’S Rule ◽  
Stream Fish ◽  
Bergmann's Rule ◽  
Size Population ◽  
Stream Fish Assemblages

The energetic equivalence rule predicts that body mass (W) and population density (β) within an assemblage are negatively correlated and will exhibit a W–0.75 = β relationship. Bergmann's rule predicts that body size among species will increase with increasing latitude. If species body size increases with latitude, the shape of the body size – population density distribution among assemblages may also vary. This change in the body size – population density distribution, when viewed in the context of the energetic equivalence rule, may indicate an alteration in the use of available energy by individuals of different sizes within an assemblage. Twenty-eight streams were sampled across four geographically distinct regions to determine if stream fish assemblages conform to the prediction of the energetic equivalence rule. Body size in stream fish assemblages did not support the pattern predicted by Bergmann's rule, but rather was negatively correlated with latitude. Stream fish assemblages generally did not conform to the relationship predicted by the energetic equivalence rule. Moreover, these results, coupled with the predictions of the energetic equivalence rule, suggest that larger individuals tended to control a disproportionately greater amount of energy than smaller individuals in stream fish assemblages, which may be partially due to predation pressure on smaller individuals.

scholarly journals Antler and Body Size in Black-Tailed Deer: An Analysis of Cohort Effects

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Johanna C. Thalmann ◽  
R. Terry Bowyer ◽  
Ken A. Aho ◽  
Floyd W. Weckerly ◽  
Dale R. McCullough
Keyword(s):  
Body Size ◽  
Population Density ◽  
Odocoileus Hemionus ◽  
The Body ◽  
Cohort Effects ◽  
Odocoileus Hemionus Columbianus ◽  
Extrinsic Factors ◽  
Large Herbivores ◽  
Female Population ◽  
Antler Size

For long-lived species, environmental factors experienced early in life can have lasting effects persisting into adulthood. Large herbivores can be susceptible to cohort-wide declines in fitness as a result of decreases in forage availability, because of extrinsic factors, including extreme climate or high population densities. To examine effects of cohort-specific extrinsic factors on size of adults, we performed a retrospective analysis on harvest data of 450 male black-tailed deer (Odocoileus hemionus columbianus) over 19 years in central California, USA. We determined that population density of females had a more dominant effect than did precipitation on body size of males. Harvest of female deer resulted in increases in the overall size of males, even though a 6-year drought occurred during that treatment period. Body size was most influenced by female population density early in life, while antler size was highly affected by both weather early in life and the year directly before harvest. This study provides insights that improve our understanding of the role of cohort effects in body and antler size by cervids; and, in particular, that reduction in female population density can have a profound effect on the body and antler size of male deer.

Body size, population density and factors regulating suspension-cultured blue mussel (Mytilusspp.) populations

2010 ◽  
Vol 23 (3) ◽  
pp. 247-254 ◽  
Author(s):  
Marcel Fréchette ◽  
Myriam Lachance-Bernard ◽  
Gaétan Daigle
Keyword(s):  
Body Size ◽  
Population Density ◽  
Blue Mussel ◽  
Size Population

scholarly journals Relationships between the Pathogen Erysiphe alphitoides, the Phytophagous Mite Schizotetranychus garmani (Acari: Tetranychidae) and the Predatory Mite Euseius finlandicus (Acari: Phytoseiidae) in Oak

Insects ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 981
Author(s):  
Slobodan Milanović ◽  
Katarina Mladenović ◽  
Bojan Stojnić ◽  
Alejandro Solla ◽  
Ivan Milenković ◽  
...  
Keyword(s):  
Body Size ◽  
Powdery Mildew ◽  
Population Density ◽  
The Body ◽  
Pedunculate Oak ◽  
Adult Size ◽  
Phytophagous Mite ◽  
Euseius Finlandicus ◽  
Erysiphe Alphitoides ◽  
The Impact

Food webs on forest trees include plant pathogens, arthropods, and their natural enemies. To increase the understanding of the impact of a plant pathogen on herbivore-natural enemy interactions, we studied the powdery mildew fungus Erysiphe alphitoides, the phytophagous mite Schizotetranychus garmani, and the predatory and mycophagous mite Euseius finlandicus in pedunculate oak (Quercus robur) leaves. In June, July and August of 2016, we assessed the severity of powdery mildew, mite population density and adult female mite size in 30 trees in three forests near Belgrade, Serbia. In August, the infection severity of E. alphitoides related positively to the population density of S. garmani and negatively to the body size of S. garmani females. Throughout the vegetative season, the infection severity of E. alphitoides related positively to the population density of E. finlandicus but not to its body size. The effect of E. alphitoides on the population density and adult size of S. garmani was not mediated by the population density of E. finlandicus, and vice versa. Interactions were consistent in all forests and varied with the summer month. Our findings indicate that E. alphitoides can influence the average body size and population densities of prey and predatory mites studied, irrespective of predator-prey relationships.

Body Size, Population Density, and the Energetic Equivalence Rule

10.2307/5894 ◽  
1995 ◽  
Vol 64 (3) ◽  
pp. 325 ◽  
Author(s):  
Pablo A. Marquet ◽  
Sergio A. Navarrete ◽  
Juan C. Castilla
Keyword(s):  
Body Size ◽  
Population Density ◽  
Size Population

Life history and reproductive biology of the invasive amphipod Melita palmata (Amphipoda: Melitidae) in the Mar Chiquita coastal lagoon, Argentina

2006 ◽  
Vol 86 (6) ◽  
pp. 1381-1387 ◽  
Author(s):  
S. Obenat ◽  
E. Spivak ◽  
L. Garrido
Keyword(s):  
Life History ◽  
Body Size ◽  
Population Density ◽  
Sex Ratio ◽  
Reproductive Biology ◽  
Coastal Lagoon ◽  
Brood Size ◽  
Maximum Size ◽  
The Body ◽  
Invasive Amphipod

The life history and reproductive biology of the gammaridean amphipod Melita palmata was studied in the Mar Chiquita coastal lagoon (Argentina). The animals were collected fortnightly or monthly from Ficopomatus enigmaticus reefs from December 2000 to March 2002. The population density reached a maximum of 1556.67±1560 ind/m3 (mean±SD) in March 2001, decreased dramatically after intense rainfalls in winter 2001, and had a minimum value of 141.67±27.54 ind/m3 (mean±SD) in March 2002. Size differed significantly between sexes. The maximum size of males was 11.5 mm and this was 1.4 times longer than the length of females. The average sex ratio (0.44) did not differ significantly from an expected 1:1 value. Ovigerous females were present from December to March, when the temperature was above 18°C. The body size of ovigerous females ranged from 2.9 to 6.81 mm. There was a positive correlation between the brood size and body length of ovigerous females, and the maximum number of eggs per female was ten. Recruitment took place during the whole breeding season; juveniles recruited at the beginning of the season matured at the end of the same season, those recruited late would probably reach maturity in the following season.

The Body Size of Headstarted and Wild Juvenile European Pond Turtles (Emys orbicularis)

2017 ◽  
Vol 25 (2) ◽  
pp. 161
Author(s):  
Sławomir Mitrus ◽  
Bartłomiej Najbar ◽  
Adam Kotowicz ◽  
Anna Najbar
Keyword(s):  
Body Size ◽  
The Body ◽  
Emys Orbicularis

scholarly journals First record of Pachycrocuta brevirostris (Gervais, 1850) from Ukraine on the background of the European occurrence of the species

2021 ◽  
Author(s):  
Adrian Marciszak ◽  
Yuriy Semenov ◽  
Piotr Portnicki ◽  
Tamara Derkach
Keyword(s):  
Body Size ◽  
First Record ◽  
The Body ◽  
Crocuta Crocuta ◽  
Early Pleistocene ◽  
Eastern Asia ◽  
South Eastern

AbstractCranial material ofPachycrocuta brevirostrisfrom the late Early Pleistocene site of Nogaisk is the first record of this species in Ukraine. This large hyena was a representative of the Tamanian faunal complex and a single specialised scavenger in these faunas. The revisited European records list ofP.brevirostrisdocumented the presence of this species in 101 sites, dated in the range of 3.5–0.4 Ma. This species first disappeared in Africa, survived in Europe until ca. 0.8–0.7 Ma, and its last, relict occurrence was known from south-eastern Asia. The main reason of extinction ofP.brevirostrisprobably was the competition withCrocuta crocuta. The cave hyena was smaller, but its teeth were proportionally larger to the body size, better adapted to crushing bones and slicing meat, and could also hunt united in larger groups.

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