scholarly journals THE INFLUENCE OF MACROALGAE ON SEASONAL ABUNDANCE AND FEEDING PREFERENCE OF A SUBTIDAL SNAIL, LACUNA VINCTA (MONTAGU) (LITTORINIDAE) IN THE GULF OF MAINE

2002 ◽  
Vol 68 (1) ◽  
pp. 73-78 ◽  
Author(s):  
SUCHANA CHAVANICH ◽  
LARRY G. HARRIS
Keyword(s):  
Gulf Of Maine ◽  
Feeding Preference ◽  
Seasonal Abundance ◽  
Lacuna Vincta

Quantitative relationships between postlarval production and benthic recruitment in lobsters, Homarus americanus

1997 ◽  
Vol 48 (8) ◽  
pp. 729 ◽  
Author(s):  
Lewis S. Incze ◽  
Richard A. Wahle ◽  
J. Stanley Cobb
Keyword(s):  
Rhode Island ◽  
Annual Variation ◽  
Gulf Of Maine ◽  
Homarus Americanus ◽  
Seasonal Abundance ◽  
Moult Cycle ◽  
American Lobster ◽  
Temperature Dependent ◽  
Dependent Growth ◽  
Island Sound

Relationships between lobster postlarval supply and benthic recruitment were evaluated within and between oceanographically distinct segments of the range of the American lobster. Postlarvae (PL) were sampled by neuston nets in western Rhode Island Sound and the western Gulf of Maine, USA, from June to September 1989–95. Benthic lobsters were sampled in sublittoral cobble habitat by using a diver-operated airlift at the end of the settlement season. Average annual recruitment densities of young-of-year (YOY) lobsters ranged from 0.3 to 1.7 m-2. YOY recruitment was positively correlated between areas. Integrated seasonal abundance of postlarvae was often much greater in Rhode Island than Maine, but production estimates (PL 1000 m-2 season-1), calculated from moult cycle stages and temperature-dependent growth rates, differed by a factor of <0.5. PL production was positively correlated between areas and explained ≥81% of the annual variation in recruitment in each area and 90% for the two areas combined. In Maine, among-site differences in YOY recruitment persisted for a year after settlement and then began to lessen, at least in part because larger individuals moved into areas of initially lower recruitment

Intraplant habitat and feeding preference of two gastropod herbivores inhabiting the kelp Laminaria hyperborea

2002 ◽  
Vol 82 (2) ◽  
pp. 243-247 ◽  
Author(s):  
Gunilla B. Toth ◽  
Henrik Pavia
Keyword(s):  
Nitrogen Content ◽  
Food Preference ◽  
Chemical Defence ◽  
Habitat Choice ◽  
Feeding Preference ◽  
Laminaria Hyperborea ◽  
Tissue Samples ◽  
Lacuna Vincta ◽  
Phlorotannin Content ◽  
Tissue Nitrogen

The habitat and feeding preference of two gastropod mesoherbivore species, Ansates (Helcion) pellucida and Lacuna vincta, inhabiting the kelp Laminaria hyperborea were investigated by studying the distribution, habitat choice and food preference of the herbivores between new and old kelp fronds. Nitrogen content and chemical defence (phlorotannin) level of the kelp fronds were measured in order to determine whether they were correlated with the feeding preference of the herbivores. The habitat choice of Lacuna vincta was correlated with the food preference of this species, while the habitat choice of A. pellucida probably was due to some other factor, e.g. competition or mortality. Ansates pellucida preferred to reside on the old fronds of Laminaria hyperborea, but consumed an equal amount of both tissue types. Lacuna vincta, however, preferred the new Laminaria hyperborea fronds both as habitat and food. There was a large variation in the phlorotannin content among the tissue samples of L. hyperborea. However, there were no overall statistically significant differences in tissue nitrogen or phlorotannin content between the new and the old L. hyperborea fronds.

Neustonic postlarval American lobsters, Homarus americanus, in the western Gulf of Maine: spatial and interannual variations

2000 ◽  
Vol 57 (4) ◽  
pp. 755-765 ◽  
Author(s):  
Lewis S Incze ◽  
Peter Aas ◽  
Terri Ainaire ◽  
Marcia Bowen
Keyword(s):  
New Hampshire ◽  
Gulf Of Maine ◽  
Stage Iv ◽  
Homarus Americanus ◽  
Seasonal Abundance ◽  
Interannual Variations ◽  
Distributed Source ◽  
High Recruitment ◽  
Benthic Population

We examined the seasonal abundance of postlarval (PL) (stage IV) American lobsters, Homarus americanus, from neuston samples from 1989 to 1995 at Johns Bay, Maine, and Seabrook, New Hampshire, located 150 km apart in the western Gulf of Maine. The postlarval season at these sites began between approximately days of the year 180 and 210 and ranged from about 35 to 70 days in duration. Within years, start and end dates were similar for the two sites. Maximum concentrations from single tows exceeded 100 PL·1000 m-2, but 85% or more of the positive tows had concentrations <15 PL·1000 m-2 and more than half had <5 PL·1000 m-2. These concentrations occurred at high levels of the stock, were the source for continued high recruitment in the 1990s, and thereby form a benchmark for future measurements. Only one of the seven years showed a major decline in seasonal abundance, and it occurred at both sites. Of the remaining years, three had nearly identical integrated abundances at both sites (approximately 200 PL· 1000 m-2·year-1). A survey in the western Gulf of Maine caught postlarvae out to 56 km offshore at concentrations similar to the coastal samples, indicating a broadly distributed source of potential recruits to the benthic population.

STUDY ON DIVERSITY AND DISTRIBUTION OF ANTS (HYMENOPTERA: FORMICIDAE) IN URBAN AND PERIURBAN AREAS OF AURANGABAD CITY, MAHARASHTRA, INDIA

2017 ◽  
Vol 23 (2) ◽  
Author(s):  
S. D. CHATE ◽  
R. J. CHAVAN
Keyword(s):  
Rainy Season ◽  
Winter Season ◽  
Seasonal Abundance ◽  
Urban Region ◽  
Ant Community ◽  
Community Variation

The present study deals with the ant community variation in and around Aurangabad city. During the study total 16 species of ants belonging to twelve genera and four subfamilies were reported in eight habitat from urban and periurban regions. Abundance of ants was more in peri-urban region as compared to urban region. Subfamily myrmicinae was more dominant as compared to other subfamilies. Seasonal abundance of ants was seen to be more in winter season and less in rainy season.

Predicting bycatch hotspots based on suitable habitat derived from fishery-independent data

2020 ◽  
Vol 641 ◽  
pp. 159-175
Author(s):  
J Runnebaum ◽  
KR Tanaka ◽  
L Guan ◽  
J Cao ◽  
L O’Brien ◽  
...  
Keyword(s):  
Habitat Suitability ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Gulf Of Maine ◽  
Homarus Americanus ◽  
Management Tool ◽  
American Lobster ◽  
Suitable Habitat ◽  
Climate Conditions ◽  
Suitability Index

Bycatch remains a global problem in managing sustainable fisheries. A critical aspect of management is understanding the timing and spatial extent of bycatch. Fisheries management often relies on observed bycatch data, which are not always available due to a lack of reporting or observer coverage. Alternatively, analyzing the overlap in suitable habitat for the target and non-target species can provide a spatial management tool to understand where bycatch interactions are likely to occur. Potential bycatch hotspots based on suitable habitat were predicted for cusk Brosme brosme incidentally caught in the Gulf of Maine American lobster Homarus americanus fishery. Data from multiple fisheries-independent surveys were combined in a delta-generalized linear mixed model to generate spatially explicit density estimates for use in an independent habitat suitability index. The habitat suitability indices for American lobster and cusk were then compared to predict potential bycatch hotspot locations. Suitable habitat for American lobster has increased between 1980 and 2013 while suitable habitat for cusk decreased throughout most of the Gulf of Maine, except for Georges Basin and the Great South Channel. The proportion of overlap in suitable habitat varied interannually but decreased slightly in the spring and remained relatively stable in the fall over the time series. As Gulf of Maine temperatures continue to increase, the interactions between American lobster and cusk are predicted to decline as cusk habitat continues to constrict. This framework can contribute to fisheries managers’ understanding of changes in habitat overlap as climate conditions continue to change and alter where bycatch interactions could occur.

Movements and foraging habitats of great shearwaters Puffinus gravis in the Gulf of Maine

2017 ◽  
Vol 574 ◽  
pp. 211-226 ◽  
Author(s):  
KD Powers ◽  
DN Wiley ◽  
AJ Allyn ◽  
LJ Welch ◽  
RA Ronconi
Keyword(s):  
Gulf Of Maine
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