936 research outputs found
Interactive effects of losing key grazers and ecosystem engineers vary with environmental context
No full textLoss of biodiversity may cause significant changes to ecosystem structure and functioning. Evidence from long-term in situ removal experiments is rare but important in determining the effects of biodiversity loss against a background of environmental variation. Limpets and mussels are thought to be important in controlling community structure on wave-exposed shores in the UK: limpets as key grazers, mussels as ecosystem engineers. A long-term factorial removal experiment revealed interactive effects that varied between 2 shores in SW England. At one site (Harlyn), removing limpets caused a significant shift in community structure, but where limpets were lost, the presence or absence of mussels made little difference. Where limpets were present, however, the removal of mussels changed the structure and variability of the community. At the other site (Polzeath), the loss of mussels caused significant changes in community structure, and limpets played a less important role. At Harlyn, fucoid algae were abundant throughout the year. There were fewer algae at Polzeath, and cover was dominated by the summer bloom of ephemerals. At Harlyn, the limpets played a major role in controlling algae, but their effects were mediated by the presence of mussels. Other grazers were not able to fulfil their role. At Polzeath, mussels were far more important, and ephemeral algae grew on them regardless of the presence or loss of limpets. These findings emphasise the need to assess spatial and temporal variation in the effects of biodiversity loss and the importance of interactive effects of loss of multiple species from different functional groups
Essay piece by Jon Hawkins on an altercation that broke out in Portland\u27s Old
No full textEssay piece by Jon Hawkins on an altercation that broke out in Portland\u27s Old Port on Dec. 31 that was characterized by police as a riot. The author, who was the disc jockey at an Old Port pub that night and witnessed the incident, claims the 12 people arrested were reacting to excessive force being used by the police department
John Hawkins, Bignor Park, near Petworth, [Sussex], to James Edward Smith, at Sir Joseph Banks', Soho Square, London
No full textResiding at Bignor Park, former home of Charlotte Smith, "whose little poems on subjects of natural history must have engaged your attention", purchased from her sister [Catherine Ann] Dorset [(d 1816) children's author]. Pleased to hear of imminent publication of "Flora Graeca Prodromus" and satisfied with second part of first volume of "Flora Graeca" which is free from the errors in the first part. In reference to 'Briza elatior' clarifies use of Greek "or" instead of Latin "in" in forming names. Cautions Smith in use of Sommarera as a source for names as the vulgar modern Greek names are so "barbarous" that some are shamed into using names taken from Matthiolus [Pietro Andrea Mattioli (1501-1577)] and others and passing them off as the real names, although they are not strictly neo-grecian. List of Greek plant names [with Hawkins' corrections and comments]
John Hawkins, Bignor Park, near Petworth, [Sussex], to James Edward Smith, at Sir Joseph Banks', Soho Square, London
No full textResiding at Bignor Park, former home of Charlotte Smith, "whose little poems on subjects of natural history must have engaged your attention", purchased from her sister [Catherine Ann] Dorset [(d 1816) children's author]. Pleased to hear of imminent publication of "Flora Graeca Prodromus" and satisfied with second part of first volume of "Flora Graeca" which is free from the errors in the first part. In reference to 'Briza elatior' clarifies use of Greek "or" instead of Latin "in" in forming names. Cautions Smith in use of Sommarera as a source for names as the vulgar modern Greek names are so "barbarous" that some are shamed into using names taken from Matthiolus [Pietro Andrea Mattioli (1501-1577)] and others and passing them off as the real names, although they are not strictly neo-grecian. List of Greek plant names [with Hawkins' corrections and comments]
Consequences of climate-driven biodiversity changes for ecosystem functioning of North European rocky shores
No full textWe review how intertidal biodiversity is responding to globally driven climate change,
focusing on long-term data from rocky shores in the British Isles. Physical evidence of warming
around the British Isles is presented and, whilst there has been considerable fluctuation, sea surface
temperatures are at the highest levels recorded, surpassing previous warm periods (i.e. late 1950s).
Examples are given of species that have been advancing or retreating polewards over the last 50 to
100 yr. On rocky shores, the extent of poleward movement is idiosyncratic and dependent upon life
history characteristics, dispersal capabilities and habitat requirements. More southern, warm water
species have been recorded advancing than northern, cold water species retreating. Models have
been developed to predict likely assemblage composition based on future environmental scenarios.
We present qualitative and quantitative forecasts to explore the functional consequences of changes
in the identity, abundance and species richness of gastropod grazers and foundation species such as
barnacles and canopy-forming algae. We forecast that the balance of primary producers and secondary
consumers is likely to change along wave exposure gradients matching changes occurring
with latitude, thereby shifting the balance between export and import of primary production.
Increases in grazer and sessile invertebrate diversity are likely to be accompanied by decreasing
primary production by large canopy-forming fucoids. The reasons for such changes are discussed in
the context of emerging theory on the relationship between biodiversity and ecosystem functioning.
KEY WORDS: Climate change · Intertidal · Range shifts · Biodiversity · Ecosystem functioning ·
Northeast Atlanti
George Hawkins visiting Malabar Farm
No full textJoe Munroe captures George Hawkins having a laugh on Malabar Farm in this 1946 picture. Hawkins was the press and scheduling manager for famed author Louis Bromfield, who owned Malabar Farm in Lucas, Ohio. Munroe's career began in 1939 at the Cranbrook Academy of Art. He served in the Air Force during World War II and then joined Cincinnati-based Farm Quarterly magazine. Though raised in Detroit, agriculture became an important subject of Joe's photographs. He moved to California in 1955 and free-lanced, taking magazine assignments and selling his own work
Hawkins, Biography, and the Law
No full textSir John Hawkins was an attorney at the Court of King’s Bench and the Court of Common Pleas in the mid eighteenth century, and Chairman of the Middlesex Quarter Sessions. He was also the author of a major history of English music and the first greatLife of Samuel Johnson (1787). This essay explores ways in which Hawkins’ Life of Johnson is based in legal thought, especially with regard to his understanding of Johnson’s legacy to the former slave Francis Barber, and Johnson’s legal advocacy on behalf of the condemned clergyman William Dodd
Dataset supporting thesis titled: 'The roles of extreme and rising temperatures on individual, population and biogeographic responses of intertidal gastropods in the northeast Atlantic'
No full textData to accompany chapters 2, 3 and 4 of PhD thesis, where original data were collected as part of this thesis and belong to the student author.
Chapter 2 data include raw EnvLogger temperature data and relevant tide time data for Portuguese study sites. Chapter 3 data include laboratory experiment digitised specimen measurement data (wet weight, coma and recovery, mortalities), raw treatment experiment temperatures and both Looe and Brixham raw field temperature data. Chapter 4 data include laboratory specimen digitised measurement data (weight, size, mortality) and raw treatment temperature data.
Chapter 3 data is associated with the publication: Parry-Wilson, H. M., Fenberg, P. B., Hawkins, S. J., & Mieszkowska, N. (2024). Lethal and sub-lethal responses of rocky shore gastropods to extreme temperatures. Journal of Experimental Marine Biology and Ecology, 579, 152044.</span
Children Play Marbles at Central School
No full textRick Hawkins and Danny Sundquist take advantage of spring like weather to shoot a game of marbles.Standing: Steve Hirshio, Dean Abplanalp, Larry Gurele, Pauline Gurele, Reva Juke, Linda Sather and David White
- …
