Author: Graham EpsteinPublisher:
ISBN:
Category :
Languages : en
Pages : 219
Book Description
The Ecology, Impact and Management Feasibility of the Invasive Kelp Undaria Pinnatifida in the UK.
Author: Graham EpsteinThe Ecology of the Invasive Kelp Undaria Pinnatifida
Author: Rocío Suárez JiménezPublisher:
ISBN:
Category : Aquatic ecology
Languages : en
Pages : 189
Book Description
Finally, field studies revealed that U. pinnatifida provides a comparable habitat to the also morphologically simple macroalgae Xiphophora gladiata and Marginariella spp., but hosts only 1/4 of the density of invertebrates compared to morphologically complex species such as Carpophyllum spp., Cystophora spp. and Sargassum sinclarii. The findings reveal that the role of U. pinnatifida as a habitat and food for the native fauna varies across ecosystems and among invertebrate species but is was generally similar to some of the native macroalgae it was compared to. This work has also demonstrated that knowledge of traits specific to faunal species (i.e. trophic position, habitat use, etc.) and macroalgae (i.e. chemistry, biomechanics, morphology, etc.) need to be considered when predicting the effects of invasive species.
Alien Species Alert
Author: Inger WallentinusPublisher:
ISBN:
Category : Biodiversity conservation
Languages : en
Pages : 46
Book Description
Factors Influencing the Establishment and Phenology of the Invasive Kelp Undaria Pinnatifida in Northern New Zealand
Author: Kate JamesPublisher:
ISBN:
Category : Invasive plants
Languages : en
Pages : 127
Book Description
Macroalgal invasions can change the structure and function of benthic habitat, dominating space, altering primary productivity, nutrient cycles, and community composition. This is a serious concern for receiving environments. A major determinant of the geographic distribution of macroalgal species is water temperature. Investigating the population ecology, genetic variation and factors controlling the density and spread of invasive macroalgae towards the extent of their thermal distribution limits can therefore provide important insights into the potential range and ecological impacts both now and with future climate change. The kelp Undaria pinnatifida is a prolific and cosmopolitan invasive species. Undaria has invaded countries around the world across a variety of temperature regimes. Undaria displays a variable phenology at introduced locations; it is a winter annual in its native range, but sporophyte presence can vary from annual to year-round across its invasive range. Information is lacking on how Undaria phenology and impacts manifest under warm-temperate conditions. This work studies Undaria in northern New Zealand, one of the warmest-water populations in the world. I investigated how water temperature influenced the phenology and distribution of Undaria. In addition I examined some attributes of the invasion process for warm-water populations; I looked at the role mussel aquaculture plays in influencing the spread of Undaria to native habitats, how disturbance might facilitate the spread of Undaria to subtidal reefs, and the genetic composition of populations in northern New Zealand. Monitoring over three growth seasons revealed how Undaria in northern New Zealand displayed an annual growth cycle. Recruitment occurred when temperatures dropped below ~15 oC and density was minimal at temperatures above 20 oC. Sporophyte size and growth rates were comparable to those of cooler water populations but the seasonal cycle was compressed into a shorter timeframe. Undaria was found to proliferate on mussel farms and low numbers were found on reefs adjacent to farms, in shallow habitats lacking native macroalgal canopies. Undaria was rare in deeper habitats dominated by native macroalgal canopies, experimental canopy removal did not facilitate the spread of Undaria into these habitats at the site examined. This suggests that native canopy-forming species are not the sole factor prohibiting the invasion of Undaria to subtidal reef sites in this region. Genetic analysis of Undaria from all known populations in the North Island revealed very low genetic diversity in northern New Zealand. The presence of a single haplotype in northeastern New Zealand may indicate a particularly warm-tolerant strain and suggests thermal preadaptation may influence invasion success. An investigation into the global distribution and associated phenology of Undaria, and how this related to water temperature regimes, demonstrated how Undaria only occurred where winter temperatures dropped below ~15 oC and that persistent year-round populations were only present at sites where summer temperatures did not exceed 20 oC. This analysis also revealed that there are extensive areas of the world where Undaria does not occur that have temperature regimes suitable for Undaria colonisation. Such areas are potentially at risk from future invasion based on current temperature regimes. These thermal limits for Undaria indicate that populations in northern New Zealand are towards the limit of its distribution, with winter temperatures close to 15 oC, Undaria is unable to withstand warmer winter temperatures. Ocean warming is likely to restrict the potential geographic distribution of Undaria, particularly where winter temperatures exceed 15 oC. Increases in summer temperatures, which prolong the period during the year when temperatures exceed 20 oC, will reduce the annual persistence of Undaria. A limited annual presence of sporophytes at warmer locations may reduce the ecological impacts of Undaria invasion as compared to cooler water locations where sporophytes persist for a longer portion of the year.
An Assessment of the Distribution of the Invasive Algae Undaria Pinnatifida Around Jersey, Its Potential Ecological Consequences and Management Options
Author: Christopher D. PirieEvaluating the Impact of the Invasive Kelp Undaria Pinnatifida on Native California Kelps Egregia Menziesii and Macrocystis Pyrifera
Author: Marla Elaine RanellettiPublisher:
ISBN:
Category :
Languages : en
Pages : 200
Book Description
Range Expansion Mechanisms of the Invasive Kelp Undaria Pinnatifida
Author: Merle BollenFifty Years of Invasion Ecology
Author: David M. RichardsonPublisher: John Wiley & Sons
ISBN: 1444335855
Category : Science
Languages : en
Pages : 459
Book Description
Invasion ecology is the study of the causes and consequences of the introduction of organisms to areas outside their native range. Interest in this field has exploded in the past few decades. Explaining why and how organisms are moved around the world, how and why some become established and invade, and how best to manage invasive species in the face of global change are all crucial issues that interest biogeographers, ecologists and environmental managers in all parts of the world. This book brings together the insights of more than 50 authors to examine the origins, foundations, current dimensions and potential trajectories of invasion ecology. It revisits key tenets of the foundations of invasion ecology, including contributions of pioneering naturalists of the 19th century, including Charles Darwin and British ecologist Charles Elton, whose 1958 monograph on invasive species is widely acknowledged as having focussed scientific attention on biological invasions.
Handbook of Alien Species in Europe
Author: Delivering Alien Invasive SpeciesPublisher: Springer Science & Business Media
ISBN: 1402082800
Category : Science
Languages : en
Pages : 421
Book Description
Biological invasions by alien (non-native) species are widely recognized as a significant component of human-caused global environmental change and the second most important cause of biodiversity decline. Alien species threaten many European ecosystems and have serious environmental, economic and health impacts. The DAISIE (Delivering Alien Invasive Species Inventories for Europe) project has now brought together all available information on alien species in Europe (terrestrial, aquatic and marine) and from all taxa (fungi, plants, animals). Thus for the first time, an overview and assessment of biological invasions in the Pan-European region is finally possible. The Handbook of Alien Species in Europe summarises the major findings of this groundbreaking research and addresses the invasion trends, pathways, and both economic as well as ecological impact for eight major taxonomic groups. Approximately 11.000 alien species recorded in Europe are listed, and fact sheets for 100 of the most invasive alien species are included, each with a distribution map and colour illustration. The book is complemented by a regularly updated internet database providing free additional information. With its highly interdisciplinary approach, DAISIE and its Handbook will be the basis for future scientific investigations as well as management and control of alien invasive species in Europe.
Biological Invasions
Author: Wolfgang NentwigPublisher: Springer Science & Business Media
ISBN: 3540369201
Category : Science
Languages : en
Pages : 444
Book Description
This new volume on Biological Invasions deals with both plants and animals, differing from previous books by extending from the level of individual species to an ecosystem and global level. Topics of highest societal relevance, such as the impact of genetically modified organisms, are interlinked with more conventional ecological aspects, including biodiversity. The combination of these approaches is new and makes compelling reading for researchers and environmentalists.