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The Role Of Predation By The Red Rock Crab Cancer Productus On The Invasive European Green Crab Carcinus Maenas In Yaquina Bay Oregon
Download The Role Of Predation By The Red Rock Crab Cancer Productus On The Invasive European Green Crab Carcinus Maenas In Yaquina Bay Oregon full books in PDF, epub, and Kindle. Read online The Role Of Predation By The Red Rock Crab Cancer Productus On The Invasive European Green Crab Carcinus Maenas In Yaquina Bay Oregon ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis The Role of Predation by the Red Rock Crab, Cancer Productus, on the Invasive European Green Crab, Carcinus Maenas, in Yaquina Bay, Oregon by : Christopher Erik Hunt
Download or read book The Role of Predation by the Red Rock Crab, Cancer Productus, on the Invasive European Green Crab, Carcinus Maenas, in Yaquina Bay, Oregon written by Christopher Erik Hunt and published by . This book was released on 2001 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Yaquina Bay, Oregon, I observed very little overlap in the distribution of the invasive green crab, Carcinus maenas, and the larger red rock crab, Cancer productus. Red rock crabs dominate the more saline, cooler lower estuary and green crabs, the less saline, warmer upper estuary. Because caged green crabs survive well in the lower estuary, I decided to test the hypothesis that red rock crabs prey on green crabs and thus contribute to their exclusion from the more physically benign lower estuary. A laboratory species interaction experiment was designed to determine whether red rock crabs prey on smaller green crabs at a higher rate than on smaller crabs of their own species. Crabs of both species were collected and sorted by weight into three size classes: small, medium and large. Small and medium crabs of both species were paired with green crabs or red rock crabs of various sizes. Crab pairs were housed in individual arenas and allowed to interact for seven days. When conspecifics were paired, mortality was less than 15 %, even in the presence of larger crabs. Smaller red rock crabs survived well in the presence of larger green crabs, but the reverse was not true. When small green crabs (60-67 mm carapace width) were matched with medium and large red rock crabs, their mortality increased to 52% and 76% respectively. A less dramatic pattern was observed for medium green crabs (73-80 mm) in the presence of medium and large C. productus. Thus on the West Coast of North America, the more aggressive red rock crab, Cancer productus, has the potential to reduce the abundance of Carcinus maenas in the more saline and cooler lower estuaries.
Book Synopsis Marine Bioinvasions: Patterns, Processes and Perspectives by : Judith Pederson
Download or read book Marine Bioinvasions: Patterns, Processes and Perspectives written by Judith Pederson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the global rate of marine introductions increases, exotic species exert greater economic and ecological impacts, affecting ecosystems and human health. The complexity of marine ecosystems challenges our ability to find easy solutions to prevention, management, and control of introductions. This book highlights issues of timely importance in marine bioinvasion science. Selected topics explore the potential evolutionary consequences and ecological impacts of introduced organisms, examine the feasibility of biological control, and describe patterns of introduction. These papers were presented at the Second International Conference on Marine Bioinvasions, which featured new marine invasion research from around the world. These papers should be of interest to scientists, students, and managers with an interest in marine bioinvasions and the application of knowledge to management concerns.
Book Synopsis Global Invader by : Sylvia Behrens Yamada
Download or read book Global Invader written by Sylvia Behrens Yamada and published by . This book was released on 2001 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Writing to educate those concerned with sea life in the Pacific Northwest, Yamada (zoology, Oregon State U., Corvallis) traces the generally devastating impact of the invasive European green crab with reference to research carried out in New England, California, Oregon, South Africa, Australia, and Tasmania. A full description of the biology and life history of the European green crab is provided, along with photos, glossary, list of references, and descriptive table of Pacific Northwest crabs. Annotation copyrighted by Book News, Inc., Portland, OR.
Book Synopsis השפעת מצבי פער בינאישי ומהות התפקיד המבוצע על התנהגות תחרותית של ילדים בשתי קבוצות גיל by :
Download or read book השפעת מצבי פער בינאישי ומהות התפקיד המבוצע על התנהגות תחרותית של ילדים בשתי קבוצות גיל written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Temperature and Predator Effects on Green Crabs (Carcinus Maenas) and Their Distribution in South Slough National Estuarine Research Reserve by :
Download or read book Temperature and Predator Effects on Green Crabs (Carcinus Maenas) and Their Distribution in South Slough National Estuarine Research Reserve written by and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The invasive green crab (Carcinus maenas) has increased in abundance and distribution among Oregon's estuaries. Its global success in establishing in new environments and tolerance for abiotic stressors, such as temperature, raises concern for C. maenas to negatively influence native crab species, especially given global climate change. To improve in predicting invasion impacts, this work analyzed the results from a controlled tank experiment at Portland State University and the field data on a population of C. maenas in South Slough National Estuarine Research Reserve (SSNERR). The aquarium experiment documented predation pressure on C. maenas across a range of temperatures (9° to 30°C) and predatory crabs Callinectes sapidus, Cancer productus, and, as a control C. maenas. The behavioral responses of prey C. maenas were observed across temperature and predator combinations. There were five categories of behavioral responses measured in time duration. The west Atlantic C. sapidus preyed heavily on C. maenas, especially at warmer water temperatures; however, east Pacific C. productus preyed much less on C. maenas and only at the cold temperatures, suggesting different trajectories of biotic resistance across the coasts as waters warm. Crab behavior aligned with the predation findings. For example, C. productus were most active at 9°C and all died at 27°C and higher. In tanks with C. productus, C. maenas were most aggressive at warm temperatures. In contrast C. maenas spent more time feeding at 9°C when in tanks with C. sapidus and, surprisingly, also with C. productus. Crab trap data from SSNERR was plotted on a map to identify surrounding habitat and bottom substrate of areas with high catch per unit effort (CPUE) of C. maenas in the last six years. Mean CPUE of C. maenas was below five throughout the SSNERR region with sites closest to the mouth of the estuary having the highest CPUE rates. Little structure was surrounding trapping sites; however, there was seagrass at sites with the highest CPUE of C. maenas. The mean CPUE difference of native species prior to (2002-2016) and following (2016-2021) C. maenas abundance increase in 2016 was compared to the mean CPUE of C. maenas in the last six years. Results indicated no correlation between the CPUE of C. maenas influencing the difference of CPUE of native crab species. The tolerance and predation avoidance demonstrated from prey C. maenas in warmer temperatures indicate their ability to acclimate and/or adapt in stressful climate change conditions of higher water temperatures. This is of concern due to the increasing potential to negatively affect Oregon native crab species, such as C. productus over time.
Book Synopsis Use of Tethered Prey for Estimating the Impact of the Invasive European Green Crab by : Laura L. Hauck
Download or read book Use of Tethered Prey for Estimating the Impact of the Invasive European Green Crab written by Laura L. Hauck and published by . This book was released on 2000 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various mollusks, including small bivalves and gastropod snails, are a common food source for intertidal crabs. Prey opening techniques used on hard-shell prey are dependent on claw size and morphology. For example, large, strong claws can crush a snail outright while smaller, weaker claws leave characteristic peels, pulls and upper whorl peels. It is therefore often possible to identify the predator responsible for a specific breakage pattern. A feeding study was conducted to "fingerprint" the shell opening techniques of the European green crab and five common native Pacific Northwest crab species on three size classes of the intertidal snail Littorina sitkana. A multiple linear regression analysis utilizing a statistical program resulted in an odds ratio that identified the crab species most likely to perform a given technique. For example, the green crab was 19 times more likely to utilize the pulling technique than a Dungeness crab, while the Dungeness crab primarily relied on crushing. The green crab was the only crab species to utilize an upper whorl peel technique. Shell breakage patterns found on snails tethered to predation lines at various sampling sites in Coos Bay and Yaquina Bay, Oregon, were then used to identify the size and species of foraging crab predators at those sites. A predation line is a tool designed to quantify the foraging impact upon small gastropod snails by various crab species in the intertidal zone. A given number of Littorina sitkana snails are attached to monofilament line with marine epoxy. These lines are then tied to metal rebar rods and left in the intertidal for one full tidal cycle. The fate of the snails on the lines is then scored as: live, attempted peel, peeled, pulled or crushed. The final results yield the overall crab foraging rate and indicate the most likely crab species responsible for the predation. This information can be very useful when comparing predation rates between sampling sites that host the invasive European green crab, and those sites that have not yet been invaded.
Book Synopsis The Impacts of the Introduced European Green Crab, Carcinus Maenas, on Selected Bivalves and Meiofaunal Communities by : Zasha A. Bassett
Download or read book The Impacts of the Introduced European Green Crab, Carcinus Maenas, on Selected Bivalves and Meiofaunal Communities written by Zasha A. Bassett and published by . This book was released on 2000 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ecophysiology of the European Green Crab (Carcinus maenas) and Related Species by : Dirk Weihrauch
Download or read book Ecophysiology of the European Green Crab (Carcinus maenas) and Related Species written by Dirk Weihrauch and published by Elsevier. This book was released on 2023-09-01 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ecophysiology of the Green Shore Crab (Carcinus maenas) and Related Species: Mechanisms Behind the Success of a Global Invader provides an in-depth perspective of this devastatingly invasive coastal species. During the last 175 years, Carcinus maenas has spread around the globe by human activities. Because of its ability to flourish in a wide variety of ecosystems and outcompete native species it has been listed as one of the top 100 worst global invaders. Written by international experts, this book focuses on Carcinus maenas and discusses other brachyurans with similar physiologies as comparisons, including control systems and mechanisms used. This book serves as a valuable resource for researchers in marine biology and invasive biology, as well as for university lecturers, government or environmental agencies. Gathers all information on ecological physiology of this important species into one place Discusses how this one species of crab has managed to be spread around the globe and survive in many different environments Features a chapter by First Nations members on how this species may impact indigenous fisheries and culture
Book Synopsis Optimal Prey Selection by Invasive European Green Crabs, Carcinus Maenas, and the Potential Impact on the Pacific Northwest's Commercial Oyster Industry by : R. S. Foster
Download or read book Optimal Prey Selection by Invasive European Green Crabs, Carcinus Maenas, and the Potential Impact on the Pacific Northwest's Commercial Oyster Industry written by R. S. Foster and published by . This book was released on 1999 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Holistic Approaches for Invasive Species Management by : Bobbie Buzzell
Download or read book Holistic Approaches for Invasive Species Management written by Bobbie Buzzell and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Establishment of the European green crab (Carcinus maenas) on the west coast United States has led to concerns regarding loss of eelgrass beds and influence on marine communities. To begin examining whether predators can potentially buffer green crab expansion, I studied river otter (Lontra canadensis) diet from scat remains and estimated green crab abundance from removal trapping efforts. River otter scats on the Wa'atch and Tsoo-Yess rivers, Washington, USA, were collected during August-September 2018 and April-September 2019. Hard remains of prey were reported as percent frequency of occurrence, and green crab prey were compared to monthly catch-per-unit-effort (CPUE). Scats collected from the Tsoo-Yess River contained no green crab, perhaps due to the relatively low abundance of green crab compared to other crustacean and fish prey. River otters consumed green crab in the Wa'atch River, but its low occurrence in their diet (0.7-5.2%) suggests that they were not an important prey source. However, I hypothesize that if green crab numbers increase there will be a subsequent increase in consumption by river otters and, as such, suggest documenting the population status of green crabs in both rivers, and conducting additional predator-prey diet studies to gauge the potential for long-term biotic resistance of green crab populations.
Book Synopsis European Green Crab (Carcinus Maenas) Predation on the American Oyster (Crassostrea Virginica) in the Bras D'Or Lakes by : Brittany A. Ellerbrok
Download or read book European Green Crab (Carcinus Maenas) Predation on the American Oyster (Crassostrea Virginica) in the Bras D'Or Lakes written by Brittany A. Ellerbrok and published by . This book was released on 2008 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Predator/prey-interactions of the Invasive Green Crab Carcinus Maenas (Crustacea: Decapoda: Brachyra) and Potential Prey Organisms (Littorina Spp; Mollusca Gastropoda) in Native and Invaded Habitats by : Gesa Schaefer
Download or read book Predator/prey-interactions of the Invasive Green Crab Carcinus Maenas (Crustacea: Decapoda: Brachyra) and Potential Prey Organisms (Littorina Spp; Mollusca Gastropoda) in Native and Invaded Habitats written by Gesa Schaefer and published by . This book was released on 2010 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Assessing Impacts of Green Crab (Carcinus Maenas) on the Abundance of American Lobster (Homarus Americaus) in Nature by : Mark Alan Wilcox
Download or read book Assessing Impacts of Green Crab (Carcinus Maenas) on the Abundance of American Lobster (Homarus Americaus) in Nature written by Mark Alan Wilcox and published by . This book was released on 2012 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prey Selection by Young Green Crabs (Carcinus Maenas), Rock Crabs (Cancer Irroratus) and American Lobsters (Homarus Americanus) in the Gulf of Maine by : Joseph Sungail
Download or read book Prey Selection by Young Green Crabs (Carcinus Maenas), Rock Crabs (Cancer Irroratus) and American Lobsters (Homarus Americanus) in the Gulf of Maine written by Joseph Sungail and published by . This book was released on 2010 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The intertidal zone in the Gulf of Maine supports large populations of three species of decapods. Young green crabs (Carcinus maenas), rock crabs (Cancer irroratus) and American lobsters (Homarus americanus) co-exist in close proximity and forage on similar prey species. Competition for prey resources could have major implications for the populations of these predators. This experimental study focuses on determining the potential for interspecific competition between these decapods for prey resources. Young green crabs (25 - 35 mm carapace width), rock crabs (25 - 35 mm carapace width) and American lobsters (25 - 35 mm carapace length) were collected along with the prey species blue mussels (Mytilus sp.), rock barnacles (Semibalanus balanoides) and common southern kelp (Saccarina latissima) from the intertidal of the southern section of Saco Bay in the Gulf of Maine.l Claw measurements were taken, prey size and prey species preference were tested and caloric value of prey was determined. Morphological measurements indicated that all three decapod species had different sized chela relative to body size. The three predators preferred similar sized mussels and barnacles, and had similar handling times for both of these prey species. None of the three predator species consumed measurable amounts of kelp. Rock crabs and lobsters preferentially selected mussels over barnacles, while green crabs consumed equal amounts of both prey species. The preferred mussel size was smaller than the calculated optimum while the optimal barnacle size was eaten. These results suggest that while green crabs, rock crabs and lobsters have differing claw morphologies, they select similar prey and consume prey at the same rate. Therefore there is a possibility of intense interspecific competition among these predators.
Book Synopsis Projecting Range Expansion of Invasive European Green Crabs (Carcinus Maenas) to Alaska by : Anson Hemingway Hines
Download or read book Projecting Range Expansion of Invasive European Green Crabs (Carcinus Maenas) to Alaska written by Anson Hemingway Hines and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The establishment of self-sustaining populations of the invasive species Carcinus maenas, or European green crab, in Alaska may be prevented by environmental conditions. Laboratory experiements measured temperature and salinity conditions required for successful development of green crab larvae to test this hypothesis.
Book Synopsis A Study of Green Crab (Carcinus Maenas) Interactions, Cannibalism, and a First Approach to Model the Effects of Harvesting on Its Populations by : Hannah B. Gehrels
Download or read book A Study of Green Crab (Carcinus Maenas) Interactions, Cannibalism, and a First Approach to Model the Effects of Harvesting on Its Populations written by Hannah B. Gehrels and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Green crabs (Carcinus maenas) have been extensively studied because of the negative impacts that they have on the ecosystems that they invade. However, there are still substantial gaps of knowledge about their interactions and population dynamics. As green crabs continue to invade new locations, it is important to gain a deeper understanding of these subject areas in order to prevent or mitigate further introductions or spread. This thesis aims to address these knowledge gaps by focusing on two main topics: (1) green crab predator-prey interactions with smaller conspecifics and a native counterpart, the mud crab (Dyspanopeus sayi), and (2) a first attempt using a model to predict green crab population dynamics and the potential effects of a removal program. First, I analysed long-term observational beach-seine data collected from the southern Gulf of St. Lawrence, and found that there was a negative association between native mud crabs and green crabs in this area. Then I used laboratory experiments to examine their predator-prey interactions and assessed the influence of habitat complexity on the outcome of these interactions. I found that green crab predators consumed almost twice as many mud crabs compared to juvenile green crabs in the two less structured habitats (no substrate or sandy substrate), but predation rates were statistically similar in oyster bed habitat. This study found that mud crab mortality was significantly affected by habitat type, whereas green crab mortality was not. I then focused on green crab cannibalism by adults on juveniles with similar laboratory experiments. In this study, I included habitat types that represented a wider range of structural complexity, and found that cannibalism rates declined with increasing habitat complexity. I also conducted field inclusion experiments that gathered similar results, though the differences were not significant. I identified knowledge gaps and areas of future research by gathering all the available information about green crab life stages. This population information was used to build a relatively simple stage-based population matrix model for green crabs. The outcome of the model estimated that a theoretical green crab population could increase by approximately 43%. The outcome of this model also suggested that even if adult survival is set to zero (representing intensive trapping and effective removal of adults), the population was still able to grow because numbers in the other life stages were abundant enough to feed and maintain the population growth rate. These results suggests that current removal programs that catch mostly adults have little-to-no effect on the population growth rate, indicating that harvesting alone is unlikely to result in a reduction of annual green crab abundance.
Book Synopsis Recent Trends in the Abundance of the Invasive Green Crab (Carcinus Maenas) in Bras D'Or Lakes and Eastern Nova Scotia Based on Trap Surveys by : M. J. Tremblay
Download or read book Recent Trends in the Abundance of the Invasive Green Crab (Carcinus Maenas) in Bras D'Or Lakes and Eastern Nova Scotia Based on Trap Surveys written by M. J. Tremblay and published by . This book was released on 2006 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trapping surveys for the invasive green crab (Carcinus maenas) were undertaken in Eastern Nova Scotia and in the Bras d'Or Lakes in 1999-2000 and 2005. Interviews were also conducted with fishermen and other coastal inhabitants. Green crab were widespread throughout the sampling area and showed no change in range over the time period. Green crab abundance either decreased or did not change between 1999-2000 and 2005. Catch rates of green crab in the Bras d'Or Lakes were lower in 2005 than the earlier period. The decline in green crab abundance in Bras d'Or Lakes was not clearly linked to lower water temperatures. Outside of the Bras d'Or Lakes, there were no significant differences in green crab catch rate between 1999-2000 and 2005.--Abstract.
