Exploring The Expansion Impact And A Control Option For European Green Crab Populations In Prince Edward Island Atlantic Canada

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Exploring the Expansion, Impact and a Control Option for European Green Crab Populations in Prince Edward Island, Atlantic Canada

Author : Luke Anthony Poirier
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (118 download)

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Book Synopsis Exploring the Expansion, Impact and a Control Option for European Green Crab Populations in Prince Edward Island, Atlantic Canada by : Luke Anthony Poirier

Download or read book Exploring the Expansion, Impact and a Control Option for European Green Crab Populations in Prince Edward Island, Atlantic Canada written by Luke Anthony Poirier and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the world's most successful marine invaders, the European green crab (Carcinus maenas), continues to spread and invade the coastlines of Atlantic Canada. In Prince Edward Island in particular, populations have continued to expand since the late 1990s. In areas like these, there is a distinct need to document this species' expansion into new habitats, to monitor its impacts on important native species, and to develop innovative mitigation strategies to control some of its effects. This thesis addressed the large information gap that still exists on this species' effect in the Atlantic Canadian region by focusing on four main areas: First, I explored over a decade of green crab population expansion records along Prince Edward Island's main shorelines. Second, I surveyed and examined the effects of green crabs on vulnerable size classes of an important shellfish species, the American oyster (Crassostrea virginica). Third, I performed a preliminary study into the occurrence and synchrony of molting in green crabs, identifying suitable physical features of pre-molting crabs as a first step for developing a soft-shell crab industry. And fourth, I developed and tested a novel bycatch reduction device to be used with fyke nets to facilitate the implementation of the aforementioned directed fishery for this species. Samples collected during the years 2000-2013 indicated that green crab expansion rates on Prince Edward Island vary spatially and temporarily. Expansion rates were higher along the south shore than the north shore of the island, and it was hypothesized that this dissimilarity was possibly related to the higher availability of suitable habitat along the south shore. The speed of the spread was such that it seemed more likely related to the benthic movement of juvenile and adult crabs than associated to larval spread or new anthropogenic vectors. With regards to green crab impacts, multiple oyster bed surveys conducted in 2014 measured mortality levels of vulnerable size classes of oysters. These surveys revealed that the probability of mortality of small oysters was higher in areas where green crabs were present. This probability decreased in the presence of other food sources (i.e. mussel beds), a result likely linked to green crab prey preferences. Field experiments using inclusion/exclusion cages indicated that the odds of oyster mortality was higher in inclusion cages than in the open environment and exclusion cages. These results suggested that at least some of the mortality of oysters could be attributed to green crab predation. With the recent implementation of a fishery for green crab as a potential mitigation strategy, there is a need for a marketable product to prompt fishermen to harvest green crabs. A soft-shell green crab product modelled after the Venetian "moleche" is expected to provide a lucrative incentive beyond the existing hard shell bait market. The examination of the timing and characteristics of molting revealed that synchronized "molting windows" or times of increased molting occur in the early summer for male green crabs. Recorded molting rates in the laboratory and the field were as high as 75% and 60%, respectively. External physical characteristics such as the presence of a "halo" on the episternites of the carapace, were deemed a reliable indicator that a crab would molt within 3 weeks. Although these results were preliminary in nature, they were promising and suggested that further studies be performed on the potential scaling up of these results. Fyke nets are a natural choice for a directed fishery of green crabs, as this type of gear is readily available and used locally, primarily for American eel (Anguilla rostrata). These nets are also a variant of the fyke net used in Italy to fish for a similar species of crab (Carcinus aestuarii) during its molting season. However, before fyke nets can be used in a directed fishery for green crab in Atlantic Canada, bycatch must be reduced. A novel Bycatch Reduction Device (BRD) for fyke nets was therefore developed and evaluated. Bycatch numbers and diversity, including three key commercial species, were significantly lower in the BRD equipped nets. Overall, the results of this thesis advance green crab research in the region, especially with regards to the quantification of impacts and development of mitigation measures. Further research questions as a result of my thesis work are identified and briefly discussed.

Impacts of Newly Established Non-indigenous Green Crab (Carcinus Maenas) on Native Fauna in Placentia Bay, Newfoundland

Author : Melanie Anne Rossong
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (132 download)

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Book Synopsis Impacts of Newly Established Non-indigenous Green Crab (Carcinus Maenas) on Native Fauna in Placentia Bay, Newfoundland by : Melanie Anne Rossong

Download or read book Impacts of Newly Established Non-indigenous Green Crab (Carcinus Maenas) on Native Fauna in Placentia Bay, Newfoundland written by Melanie Anne Rossong and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent invasion of the European green crab (Carcinus maenas) populations in Placentia Bay, Newfoundland and Labrador (NL) raises great concern about potential impacts on local fisheries and native biodiversity. Green crab are highly adaptable and in both native and invaded areas, green crab are well established predators that can outcompete other similarly sized decapods. The main objectives of this thesis were to: 1) identify the native species that green crab compete with for resources; 2) determine the depths and substrate types in which these interactions likely occur; 3) assess the indirect effects of green crab on native crustaceans and their changes in behavior; 4) assess the impacts of green crab on benthic community structure; 5) compare the NL population with other Atlantic Canadian populations in terms of competitive abilities; and 6) compare morphological features of the NL population with other Atlantic Canadian populations. I found that green crab overlap in space and diet with both rock crab (Cancer irroratus) and American lobster (Homarus americanus), potentially leading to a shift in habitat. Laboratory studies on naïve juvenile lobster also suggested shifts in behavior related to green crab, in that lobster decreased foraging activity and increased shelter use in the presence of green crab. Benthic community analyses showed fewer species in mud, sand, and eelgrass sites heavily populated by green crab compared to sites without green crab, although results depended on the taxa involved and I could not eliminate environmental differences through a short term caging study. Foraging ability of green crab varied in intraspecific competition experiments, with populations from NL and Prince Edward Island dominating longer-established populations from Nova Scotia and New Brunswick. Additional studies excluded claw size as a factor driving these results and behavioral differences likely reflected differences in invasion time and population genetics. Overall, green crab in Placentia Bay appear to be altering community structure of benthic invertebrates through predation and they also appear to indirectly impact native crustaceans through competition.

Global Invader

Author : Sylvia Behrens Yamada
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.:/5 (319 download)

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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.

Ecophysiology of the European Green Crab (Carcinus maenas) and Related Species

Author : Dirk Weihrauch
Publisher : Elsevier
ISBN 13 : 0323996957
Total Pages : 310 pages
Book Rating : 4.3/5 (239 download)

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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

Holistic Approaches for Invasive Species Management

Author : Bobbie Buzzell
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (128 download)

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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.

Predator-prey Interactions Between the European Green Crab (Carcinus Maenas) and Bivalves Native to Prince Edward Island

Author : Tyler R. Pickering
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (118 download)

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Book Synopsis Predator-prey Interactions Between the European Green Crab (Carcinus Maenas) and Bivalves Native to Prince Edward Island by : Tyler R. Pickering

Download or read book Predator-prey Interactions Between the European Green Crab (Carcinus Maenas) and Bivalves Native to Prince Edward Island written by Tyler R. Pickering and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Under that size threshold, oysters remain highly vulnerable and require management measures in order to secure their sustainability. As green crabs continue to spread in PEI and the Gulf of St. Lawrence, further mitigations strategies are likely to be needed. The results presented in this thesis provide the foundation for future developments of these mitigation strategies.

The Effect of Temperature on Phenotypes of the Invasive European Green Crab

Author :
Publisher :
ISBN 13 :
Total Pages : 179 pages
Book Rating : 4.:/5 (92 download)

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Book Synopsis The Effect of Temperature on Phenotypes of the Invasive European Green Crab by :

Download or read book The Effect of Temperature on Phenotypes of the Invasive European Green Crab written by and published by . This book was released on 2013 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Invasion physiology is an emerging field that endeavors to understand the influence of physiological traits on the establishment of non-native species in novel environments. The invasive European green crab,Carcinus maenas, is one of the world's most successful aquatic invaders, and is currently distributed across temperate marine ecosystems globally. The work presented here explored the thermal physiology of this species, and has highlighted several physiological traits that have likely influenced establishment success. Intraspecific comparisons of crabs sampled from the northern and southern edges of their recipient, or invaded range on the west coast of North America have identified both organismal and cellular physiological difference with respect to upper and lower thermal tolerances. Crabs sampled from British Columbia, Canada (BC) had a significantly lower mean upper thermal tolerance threshold and heat shock protein synthesis, Hsp70, compared to their warm acclimated conspecifics sampled from California (CA). These differential physiologic responses may be rooted in the disparate natural thermal habitats that each population occupies within their respective environments. The ability of this species to extend its current range limits was also investigated. Range expansion to the south has been limited, and is likely restricted by this species lack of adaptation to warmer temperatures. Because range expansion has been chiefly northward, characterizing this species' response to cold stress can identify whether colder temperatures poleward may limit further range expansion. Cold tolerance capacity was determined in the laboratory, and crabs sampled from Vancouver Island, British Columbia were able to withstand the over-wintering thermal regime that occurs in Sitka, Alaska, a site that is currently beyond the range limits of this species. Furthermore, intraspecific assessments found that the cold acclimated BC population exposed to cold shock significantly down regulated protein levels of cyclin D1, cell cycle modulator. Distinct differences in carapace width (CW) were detected along the thermal gradient present in the green crabs' range. This variation in body size was utilized to the test the temperature size rule hypothesis for ectotherms. Simply stated, the temperature size rule is the tendency for ectotherms to develop slower but mature to a larger body sizes at cooler temperatures. The results supported this hypothesis as crabs sampled from the warm portion of the range were found to be smaller than crabs sampled from the colder portion of the range. This pattern was detected along the native range as well. Differences in body size have the potential to influence the scope of invasion; larger individuals are generally more fecund and longer lived, which can increase both the intensity and frequency of larval dispersal that could further propel range expansion. The physiologic properties that the green crab possesses which may influence invasion success were examined using peer-reviewed literature with the aim of determining if these physiological traits confer invasion success across taxa. This analysis tested four hypotheses: 1) Broad geographic temperature tolerances (thermal width) confer a higher upper thermal tolerance threshold when comparing invasive and native species. 2) The upper thermal extreme experienced in nature is correlated with upper thermal tolerance threshold. 3) Protein chaperone expression, a cellular mechanism underlying thermal tolerance threshold, is greater in invasive organisms than in native ones. 4) Acclimation to higher temperatures can promote a greater range of thermal tolerance for invasives compared to natives. These preliminary results generally support the four stated hypotheses, and provide a solid foundation for further studies to explore and identify physiologic traits that facilitate invasion success. Overall, these studies investigated the thermal physiology of Carcinus maenasfrom an invasive metapopulation and have brought about significant advances in our understanding of what physiologic traits correlate to invasion success in this species. In addition, the data presented here can aid resource managers in identifying habitats, based on thermal tolerance measurements that fit the criteria for invasion. Understanding how invasive organisms vary with respect to thermal tolerance can aid our understanding the patterns and processes of species invasions.

Reproduction in a Recently Established Population of Green Crab, Carcinus Maenas, in Placentia Bay and Juvenile Targeted Mitigation to Prevent Mussel Aquaculture as a Vector for Introduction and Spread

Download Reproduction in a Recently Established Population of Green Crab, Carcinus Maenas, in Placentia Bay and Juvenile Targeted Mitigation to Prevent Mussel Aquaculture as a Vector for Introduction and Spread PDF Online Free

Author : Kiley Morgan Best
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (131 download)

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Book Synopsis Reproduction in a Recently Established Population of Green Crab, Carcinus Maenas, in Placentia Bay and Juvenile Targeted Mitigation to Prevent Mussel Aquaculture as a Vector for Introduction and Spread by : Kiley Morgan Best

Download or read book Reproduction in a Recently Established Population of Green Crab, Carcinus Maenas, in Placentia Bay and Juvenile Targeted Mitigation to Prevent Mussel Aquaculture as a Vector for Introduction and Spread written by Kiley Morgan Best and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Invasive species are organisms that are introduced to a new environment via natural or anthropogenic means and cause damage to the native biota through interactions with the native species and habitat. Aquatic invasive species (AIS) in marine coastal ecosystems can thrive in coastal areas in their native and non-native ranges as they have fewer natural barriers to contain spread versus terrestrial environments. AIS spread via vessel traffic, movement of industrial and recreational equipment and currents, weather events, and other organisms in their fluid environment. Generally, invasive species have the ability to tolerate extreme and restrictive conditions with means to make adjustments to their survival strategies to survive and establish populations in areas outside of their native ranges. In this study, we look at the reproductive strategies of the European green crab (Carcinus maenas) in recently invaded cold-tolerant populations in Newfoundland. We estimate size minimums for physiological maturity in males and females, timing for mating behaviors, duration of each stage of egg development and timing of larval release in females. This information has been used to establish minimum size thresholds for pilot mitigation efforts in the area and will continue to help pinpoint the best times of year to target a particular life stage for this region. Comparisons to other non-native green crab populations in Atlantic Canada are made to elucidate some of the strategic changes they have made in these environments. This information can be used in targeting different life stages in efforts to control already established populations in Newfoundland and prevent spread and establishment to new areas. This information is then used to pinpoint a vulnerable (likely to settle in and around mussel seed lines of the aquaculture industry) life stage of juvenile green crab to target via mitigation. This was investigated by exposing juveniles to a series of heated salt water immersion treatments. Experiments confirmed that exposing juvenile green crab to heated salt water for no longer than 1 minute at 45°C is sufficient to cull the crab while not causing any significant physiological stress to mussel seed. This information and subsequent control measures are valuable to the mussel aquaculture industry, stakeholders and managers for designing plans for future control of this invasive species.

In the Wrong Place - Alien Marine Crustaceans: Distribution, Biology and Impacts

Author : Bella S. Galil
Publisher : Springer Science & Business Media
ISBN 13 : 9400705913
Total Pages : 714 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis In the Wrong Place - Alien Marine Crustaceans: Distribution, Biology and Impacts by : Bella S. Galil

Download or read book In the Wrong Place - Alien Marine Crustaceans: Distribution, Biology and Impacts written by Bella S. Galil and published by Springer Science & Business Media. This book was released on 2011-04-01 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt: In The Wrong Place: Alien Marine Crustaceans - Distribution, Biology And Impacts provides a unique view into the remarkable story of how shrimps, crabs, and lobsters – and their many relatives – have been distributed around the world by human activity, and the profound implications of this global reorganization of biodiversity for marine conservation biology. Many crustaceans form the base of marine food chains, and are often prominent predators and competitors acting as ecological engineers in marine ecosystems. Commencing in the 1800s global commerce began to move hundreds – perhaps thousands – of species of marine crustaceans across oceans and between continents, both intentionally and unintentionally. This book tells the story of these invasions from Arctic waters to tropical shores, highlighting not only the importance and impact of all prominent crustacean invasions in the world's oceans, but also the commercial exploitation of invasive crabs and shrimps. Topics explored for the first time in one volume include the historical roots of man's impact on crustacean biogeography, the global dispersal of crabs, barnacle invasions, insights into the potential scale of tropical invasions, the history of the world's most widely cultured shrimp, the invasive history and management of red king crabs in Norway, Chinese mitten crabs in England, and American blue crabs in Europe, the evolutionary ecology of green crabs, and many other subjects as well, touching upon all ocean shores.

Interactions in the Marine Benthos

Author : Stephen J. Hawkins
Publisher : Cambridge University Press
ISBN 13 : 110841608X
Total Pages : 535 pages
Book Rating : 4.1/5 (84 download)

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Book Synopsis Interactions in the Marine Benthos by : Stephen J. Hawkins

Download or read book Interactions in the Marine Benthos written by Stephen J. Hawkins and published by Cambridge University Press. This book was released on 2019-08-29 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive account of how abiotic and biotic interactions shape patterns of coastal marine biodiversity and ecosystem processes globally.

Projecting Range Expansion of Invasive European Green Crabs (Carcinus Maenas) to Alaska

Author : Anson Hemingway Hines
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (191 download)

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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.

Dissertation Abstracts International

Author :
Publisher :
ISBN 13 :
Total Pages : 806 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Dissertation Abstracts International by :

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Distribution and Biological Characteristics of European Green Crab, Carcinus Maenas, in British Columbia, 2006-2013

Author : G. E. Gillespie
Publisher :
ISBN 13 : 9781100255361
Total Pages : 88 pages
Book Rating : 4.2/5 (553 download)

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Book Synopsis Distribution and Biological Characteristics of European Green Crab, Carcinus Maenas, in British Columbia, 2006-2013 by : G. E. Gillespie

Download or read book Distribution and Biological Characteristics of European Green Crab, Carcinus Maenas, in British Columbia, 2006-2013 written by G. E. Gillespie and published by . This book was released on 2015 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The European Green Crab, Carcinus maenas is native to coastal areas from northern Europe to North Africa. It is also a highly invasive species worldwide with reproductive populations in Australia, South Africa, North America and South America. In British Columbia, European Green Crabs were surveyed from 2006 to 2013. Data collected during annual surveys was used to elucidate C. maenas distribution, life history, growth and reproductive habits on the coast of British Columbia. Niche overlap with local crabs and other marine species was described in order to understand ecological impacts on native species by the establishment of C. maenas in British Columbia. In this document, methods and results related to location and catch rates, crab sizes, sex ratio and eggs, shell condition and colour, age structure and recruitment, native crab species, and bycatch are presented.--Includes text from document.

A Biological Synopsis of the European Green Crab, Carcinus Maenas

Author : Gregory John Klassen
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (213 download)

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Book Synopsis A Biological Synopsis of the European Green Crab, Carcinus Maenas by : Gregory John Klassen

Download or read book A Biological Synopsis of the European Green Crab, Carcinus Maenas written by Gregory John Klassen and published by . This book was released on 2007 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Study of Green Crab (Carcinus Maenas) Interactions, Cannibalism, and a First Approach to Model the Effects of Harvesting on Its Populations

Download A Study of Green Crab (Carcinus Maenas) Interactions, Cannibalism, and a First Approach to Model the Effects of Harvesting on Its Populations PDF Online Free

Author : Hannah B. Gehrels
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (118 download)

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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.

Distribution and Biological Characteristics of European Green Crab, Carcinus Maenas, in British Columbia, 2006-2013

Author : Graham E. Gillespie
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (922 download)

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Book Synopsis Distribution and Biological Characteristics of European Green Crab, Carcinus Maenas, in British Columbia, 2006-2013 by : Graham E. Gillespie

Download or read book Distribution and Biological Characteristics of European Green Crab, Carcinus Maenas, in British Columbia, 2006-2013 written by Graham E. Gillespie and published by . This book was released on 2015 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Green Crab Cookbook

Author : Mary Parks
Publisher : Green Crab R&d
ISBN 13 : 9780578427942
Total Pages : 128 pages
Book Rating : 4.4/5 (279 download)

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Book Synopsis The Green Crab Cookbook by : Mary Parks

Download or read book The Green Crab Cookbook written by Mary Parks and published by Green Crab R&d. This book was released on 2019-02-04 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Green Crab Cookbook explores the culinary potential behind one of the world's worst invasive species: The European Green Crab. Learn about Venetian techniques for preparing soft-shell green crabs with or how to craft a delicious ginger caviar pâté.