Biological control of mass properties of surficial sediments: An example from Starr's Point Tidal Flat, Minas Basin, Bay of Fundy

1993 ◽  
pp. 360-377 ◽  
Author(s):  
Richard W. Faas ◽  
Harold A. Christian ◽  
Graham R. Daborn ◽  
Michael Brylinsky
Keyword(s):  
Biological Control ◽  
Tidal Flat ◽  
Bay Of Fundy ◽  
Surficial Sediments ◽  
Mass Properties

Impacts of Flounder Trawls on the Intertidal Habitat and Community of the Minas Basin, Bay of Fundy

1994 ◽  
Vol 51 (3) ◽  
pp. 650-661 ◽  
Author(s):  
Michael Brylinsky ◽  
Jamie Gibson ◽  
Donald C. Gordon Jr.
Keyword(s):  
Intertidal Zone ◽  
Benthic Diatoms ◽  
Bay Of Fundy ◽  
Intertidal Habitat ◽  
Intertidal Sediments ◽  
Surficial Sediments ◽  
Biological Impacts

Four experimental trawls were made at highwater over the intertidal zone of the Minas Basin and the effects assessed when the tide was out to determine the physical and biological impacts of groundfish trawling on the benthos. The trawl doors made furrows 30–85 cm wide and up to 5 cm deep. The rollers compressed surficial sediments but did not scour a depression. The bridle caused no obvious disturbance. Door furrows and roller marks remained visible for 2–7 mo. No significant impacts were observed on either benthic diatoms or macrobenthos. The macrobenthos was dominated by polychaetes, some of which may have the ability to take evasive action as a trawl approaches. There were few molluscs, crustaceans, or echinoderms present; these taxa have been shown to be more susceptible to trawling damage in studies done elsewhere. Nematode numbers were initially depressed in the door furrows but did recover with time. It is not known whether nematodes were killed or displaced but the latter is thought more likely. Overall, the impacts in this particular environment are judged to be minor, especially since the intertidal sediments of the Minas Basin are already exposed to similar natural stresses imposed by storms and winter ice.

scholarly journals Actuopaleoichnology of a modern Bay of Fundy macro-tidal flat: analogy with a Mississippian tidal flat deposit (Hartselle Sandstone) from Alabama

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6975
Author(s):  
Louis G. Zachos ◽  
Brian F. Platt
Keyword(s):  
Tidal Flat ◽  
Depositional Environment ◽  
Exposure Period ◽  
Hydrodynamic Characteristics ◽  
Bay Of Fundy ◽  
Grain Texture ◽  
Tidal Regime ◽  
Low Degree ◽  
High Degree ◽  
High Diversity

Trace fossil zonation in the Hartselle Sandstone of Mississippian age (Chesterian: Visean-Serpukhovian) exposed on Fielder Ridge, Alabama is compared with modern macro-tidal flat ichnocoenoses on the Bay of Fundy at Lubec, Maine, and demonstrated to be analogous by sedimentologic and ichnotaxonomic criteria. The modern flat has minimal influence from either waves or freshwater influx, and can be divided into five distinct ichnocoenoses, characterized by surface traces (epichnia) and four sedimentologic facies defined by gross grain texture or hydrodynamic characteristics, but lacking significant surface traces. Several characteristics of tidal flat deposits in a fetch-limited, marine (i.e., non-estuarine), meso- to macro-tidal regime can be used to recognize similar environments as old as the late Paleozoic. These criteria include (1) limited influence of wind and waves on the depositional environment, (2) lack of significant freshwater influence and therefore any persistent brackish environments, (3) a distinct spatial distribution of microenvironments defined by substrate and exposure period, (4) high diversity of epichnial traces directly associated with microenvironments across the tidal flat, (5) generally low degree of reworking of traces by bioturbation but high degree of reworking by tidal currents, and (6) preservation of traces of predation and scavenging behavior on an exposed surface. These features, together with the regional depositional pattern of the Hartselle Sandstone interpreted as tide-influenced bars and shoals, support a meso- to macro-tidal interpretation of the depositional environment.

scholarly journals Sediment Coarsening in Tidal Flats and Stable Coastline of the Abandoned Southern Yellow River Sub-Delta in Response to Fluvial Sediment Flux Decrease During the Past Decades

2021 ◽  
Vol 8 ◽  
Author(s):  
Lin Zeng ◽  
Chao Zhan ◽  
Qing Wang ◽  
Xianbin Liu ◽  
Longsheng Wang ◽  
...  
Keyword(s):  
Grain Size ◽  
Tidal Flat ◽  
Fine Particles ◽  
Yellow River ◽  
River Estuary ◽  
Ecological Impacts ◽  
Sediment Supply ◽  
Sediment Flux ◽  
Reverse Direction ◽  
Surficial Sediments

Due to remarkable reduction of sediment supply, the vulnerability of Yellow River deltaic system increased and ecological impacts occurred to some extent. To have a comprehensive and quantitative understanding of the morphological evolution of deltas, surficial sediments of tidal flat along the abandoned southern Yellow River sub-delta and two adjacent coastal units were systematically collected and evaluated by grain-size analysis in the study. The results reveal that surficial sediments of the abandoned southern Yellow River sub-delta have been coarsening significantly since the 1980s, as characterized by a decrease in both the mud content and the clay/mud ratio. In particular, the transition from cohesive to non-cohesive sediment was completed between 2007 and 2013. With a sharp decrease in sediment flux from the Yellow River estuary, the flood currents from the submarine coastal slope carry few fine particles into the tidal zone, whereas the ebb currents with reverse direction remove some fine particles from the tidal flat. This is a major cause of sediment coarsening in the tidal flat. As sediment coarsening, the coastline of the abandoned southern Yellow River sub-delta has remained stable. The significant change in the grain size of the tidal flat surficial sediments may have a profound impact on the future coastal geomorphic evolution.

Soil Temperature Variations on a Tidal Flat in Minas Basin, Bay of Fundy, Canada

1993 ◽  
Vol 36 (4) ◽  
pp. 345-357 ◽  
Author(s):  
M.C. Piccolo ◽  
G.M.E. Perillo ◽  
G.R. Daborn
Keyword(s):  
Soil Temperature ◽  
Tidal Flat ◽  
Bay Of Fundy ◽  
Temperature Variations

Electron investigations of rhabdovirus-like particles in mexican bean beetles and crickets

1978 ◽  
Vol 36 (2) ◽  
pp. 378-379
Author(s):  
J. R. Adams ◽  
G. J Tompkins ◽  
A. M. Heimpel ◽  
E. Dougherty
Keyword(s):  
Biological Control ◽  
Integrated Pest Management ◽  
Pest Management ◽  
Developmental Stages ◽  
Management Program ◽  
Acheta Domesticus ◽  
Epilachna Varivestis ◽  
House Cricket ◽  
Similar Morphology ◽  
Bean Beetle

As part of a continual search for potential pathogens of insects for use in biological control or on an integrated pest management program, two bacilliform virus-like particles (VLP) of similar morphology have been found in the Mexican bean beetle Epilachna varivestis Mulsant and the house cricket, Acheta domesticus (L. ).Tissues of diseased larvae and adults of E. varivestis and all developmental stages of A. domesticus were fixed according to procedures previously described. While the bean beetles displayed no external symptoms, the diseased crickets displayed a twitching and shaking of the metathoracic legs and a lowered rate of activity.Examinations of larvae and adult Mexican bean beetles collected in the field in 1976 and 1977 in Maryland and field collected specimens brought into the lab in the fall and reared through several generations revealed that specimens from each collection contained vesicles in the cytoplasm of the midgut filled with hundreds of these VLP's which were enveloped and measured approximately 16-25 nm x 55-110 nm, the shorter VLP's generally having the greater width (Fig. 1).

Cost-Benefit Reasoning About Biological Control

2007 ◽  
Author(s):  
Andrew E. Monroe ◽  
Corinne Zimmerman
Keyword(s):  
Biological Control ◽  
Cost Benefit

Yellow Brazilian Pepper-tree Leaf Galler (suggested common name) Calophya latiforceps Burckhardt (Insecta: Hemiptera: Calophyidae: Calophyinae)

EDIS ◽  
2017 ◽  
Vol 2017 (6) ◽  
Author(s):  
James P. Cuda ◽  
Patricia Prade ◽  
Carey R. Minteer-Killian
Keyword(s):  
Biological Control ◽  
North America ◽  
Natural Enemies ◽  
Host Plants ◽  
Classical Biological Control ◽  
Biological Control Agents ◽  
Pepper Tree ◽  
Brazilian Pepper ◽  
Close Relatives ◽  
Tree Leaf

In the late 1970s, Brazilian peppertree, Schinus terebinthifolia Raddi (Sapindales: Anacardiaceae), was targeted for classical biological control in Florida because its invasive properties (see Host Plants) are consistent with escape from natural enemies (Williams 1954), and there are no native Schinus spp. in North America. The lack of native close relatives should minimize the risk of damage to non-target plants from introduced biological control agents (Pemberton 2000). [...]

Biological control of postharvest fungal rots of rosaceous fruits using microbial antagonists and plant extracts - a review.

2016 ◽  
Vol 68 (1) ◽  
pp. 41-66 ◽  
Author(s):  
Shazia Parveen ◽  
Abdul Hamid Wani ◽  
Mohd Yaqub Bhat ◽  
Jahangir Abdullah Koka
Keyword(s):  
Biological Control ◽  
Plant Extracts
Sign in / Sign up

Export Citation Format

Share Document