scholarly journals Density-dependent foraging and mutual interference in blue crabs preying upon infaunal clams

1991 ◽  
Vol 72 ◽  
pp. 239-246 ◽  
Author(s):  
RA Mansour ◽  
RN Lipcius
Keyword(s):  
Mutual Interference ◽  
Blue Crabs ◽  
Density Dependent

BEHAVIOR OF THE PARASITOID PLEOLOPHUS BASIZONUS (HYMENOPTERA: ICHNEUMONIDAE) IN RESPONSE TO CHANGES IN HOST AND PARASITOID DENSITY

1972 ◽  
Vol 104 (1) ◽  
pp. 129-140 ◽  
Author(s):  
Peter W. Price
Keyword(s):  
Apparent Density ◽  
Mutual Interference ◽  
Egg Laying ◽  
Parasitoid Behavior ◽  
Density Dependent ◽  
Unparasitized Host ◽  
Adult Parasitoid ◽  
Escape Reaction ◽  
General Aspects

AbstractA synthesis of observations on density-dependent interactions in parasitoid populations is attempted, working from the particular aspects of discrimination against parasitized hosts and detailed observations on parasitoid behavior, to more general aspects of parasitoid ecology, dispersal, distribution, and response to host populations. Females of Pleolophus basizonus (Gravenhorst) are able to discriminate against parasitized hosts of Neodiprion swainei Middleton between narrow limits (mean densities of 0.4 to 1.4 eggs per cocoon) set by the probability of a female finding an unparasitized host. They show mutual interference in egg laying at high parasitoid:host ratios, and a density-dependent escape reaction to adult parasitoid density. These behaviors all result from the recognition of repellent trail odors left by searching females. Response of individual females to high parasitoid densities may therefore lead to dispersal, the occupation by the population of more, but not so favorable habitats, and an apparent density-independent response to host populations.

scholarly journals Density‐Dependent Settler‐Recruit‐Juvenile Relationships in Blue Crabs

1996 ◽  
Vol 66 (3) ◽  
pp. 277-300 ◽  
Author(s):  
Adele J. Pile ◽  
Romuald N. Lipcius ◽  
Jacques van Montfrans ◽  
Robert J. Orth
Keyword(s):  
Blue Crabs ◽  
Density Dependent

Urbanization impacts on production and recruitment of Fundulus heteroclitus in salt marsh creeks

2020 ◽  
Vol 645 ◽  
pp. 187-204
Author(s):  
PJ Rudershausen ◽  
JA Buckel
Keyword(s):  
Salt Marsh ◽  
Salt Marshes ◽  
Fundulus Heteroclitus ◽  
Multiple Factor Analysis ◽  
Southeastern Usa ◽  
Density Dependent ◽  
Dependent Relationship ◽  
Juvenile Abundance ◽  
The Relationship ◽  
Throw Trap

It is unclear how urbanization affects secondary biological production in estuaries in the southeastern USA. We estimated production of larval/juvenile Fundulus heteroclitus in salt marsh areas of North Carolina tidal creeks and tested for factors influencing production. F. heteroclitus were collected with a throw trap in salt marshes of 5 creeks subjected to a range of urbanization intensities. Multiple factor analysis (MFA) was used to reduce dimensionality of habitat and urbanization effects in the creeks and their watersheds. Production was then related to the first 2 dimensions of the MFA, month, and year. Lastly, we determined the relationship between creek-wide larval/juvenile production and abundance from spring and abundance of adults from autumn of the same year. Production in marsh (g m-2 d-1) varied between years and was negatively related to the MFA dimension that indexed salt marsh; higher rates of production were related to creeks with higher percentages of marsh. An asymptotic relationship was found between abundance of adults and creek-wide production of larvae/juveniles and an even stronger density-dependent relationship was found between abundance of adults and creek-wide larval/juvenile abundance. Results demonstrate (1) the ability of F. heteroclitus to maintain production within salt marsh in creeks with a lesser percentage of marsh as long as this habitat is not removed altogether and (2) a density-dependent link between age-0 production/abundance and subsequent adult recruitment. Given the relationship between production and marsh area, natural resource agencies should consider impacts of development on production when permitting construction in the southeastern USA.

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