Ecological criteria for evaluating candidate sites for marine reserves

Several schemes have been developed to help select the locations of marine reserves. All of them combine social, economic, and biological criteria, and few offer any guidance as to how to prioritize among the criteria identified. This can imply that the relative weights given to different criteria are unimportant. Where two sites are of equal value ecologically; then socioeconomic criteria should dominate the choice of which should be protected. However, in many cases, socioeconomic criteria are given equal or greater weight than ecological considerations in the choice of sites. This can lead to selection of reserves with little biological value that fail to meet many of the desired objectives. To avoid such a possibility, we develop a series of criteria that allow preliminary evaluation of candidate sites according to their relative biological values in advance of the application of socioeconomic criteria. We include criteria that,. while not strictly biological, have a strong influence on the species present or ecological processes. Out scheme enables sites to be assessed according to their biodiversity, the processes which underpin that diversity, and the processes that support fisheries and provide a spectrum of other services important to people. Criteria that capture biodiversity values include biogeographic representation, habitat representation and heterogeneity, and presence of species or populations of special interest (e.g., threatened species). Criteria that capture sustainability of biodiversity and fishery values include the size of reserves necessary to protect viable habitats, presence of exploitable species, vulnerable life stages, connectivity among reserves, links among ecosystems, and provision of ecosystem services to people. Criteria measuring human and natural threats enable candidate sites to be eliminated from consideration if risks are too great, but also help prioritize among sites where threats can be mitigated by protection. While our criteria can be applied to the design of reserve networks, they also enable choice of single reserves to be made in the context of the attributes of existing protected areas. The overall goal of our scheme is to promote the development of reserve networks that will maintain biodiversity and ecosystem functioning at large scales. The values of eco-system goods and services for people ultimately depend on meeting this objective.

Maailman merien mennyt loisto

Kirjallisuusarvostelu

Depositional environments for strata cored in CRP-3 (Cape Roberts Project), Victoria Land Basin, Antarctica: palaeoglaciological and palaeoclimatological inferences

Cape Roberts Project drill core 3 (CRP-3) was obtained from Roberts ridge, a sea-floor high located at 77°S, 12 km offshore from Cape Roberts in western McMurdo Sound, Antarctica. The recovered core is about 939 m long and comprises strata dated as being early Oligocene (possibly latest Eocene) in age, resting unconformably on ∼ 116 m of basement rocks consisting of Palaeozoic Beacon Supergroup sediments. The core includes ten facies commonly occuring in five major associations that are repeated in particular sequences throughout the core and which are interpreted as representing different depositional environments through time. Depositional systems inferred to be represented in the succession include: outer shelf, inner shelf, nearshore to shoreface each under iceberg influence, deltaic and/or grounding-line fan, and ice proximal-ice marginal-subglacial (mass flow/rainout diamictite/subglacial till) singly or in combination. The record is taken to represent the initial talus/alluvial fan setting of a glaciated rift margin adjacent to the block-uplifted Transantarctic Mountains. Development of a deltaic succession upcore was probably associated with the formation of palaeo-Mackay valley with temperate glaciers in its headwaters. At that stage glaciation was intense enough to support glaciers ending in the sea elsewhere along the coast, but a local glacier was fluctuating down to the sea by the time the youngest part of CRP-3 was being deposited. Changes in palaeoenvironmental interpretations in this youngest part of the core are used to estimate relative glacial proximity to the drillsite through time. These inferred glacial fluctuations are compared with the global δ18O and Mg/Ca curves to evaluate the potential of glacial fluctuations on Antarctica for influencing these records of global change. Although the comparisons are tentative at present, the records do have similarities, but there are also some differences that require further evaluation.

Recensão de: Adams, Roberts; Dominelli, Lena and Payne, Malcolm (Eds.), Social Work Futures: Crossing Boundaries, Transforming Practice, Hampshire, Palgrave, 2005.

Revista Lusófona de Ciências Sociais

New host records and localities of some Monogenea from brazilian marine fishes with scanning electron microscopy of Bicotylophora trachinoti (Mac Callum, 1921)

Bicotylophora trachinoti (Mac Callum, 1921) from Trachinotus carolinus L.; Pseudanthocotyloides heterocotyle (Van Beneden, 1871) from Cetengraulis edentulus (Cuvier), and Decapterus punctatus (Cuvier), new host records; Pseudomazocraes selene Hargis, 1957 from Selene vomer (L.) and Caranx latus Agassiz, new host record, are reported for the first time in Brazil from the coast of Rio de Janeiro State. The marine fishes Diplectrum sp. and Pomatomus saltatrix (L.) are respectively new host records for Pseudotagia cupida (Hargis, 1956) and Macrovalvitrema sinaloense Caballero & Bravo Hollis, 1955. Measurements, original figures and photos in scanning electron microscopy of B. trachinoti are presented. The egg with filaments is reffered for the first time in the genus Pseudanthocotyloides.

Grève de cheminots anglais, M. [le ministre du Travail George Henry] Roberts et sir David Shackleton [secrétaire permanent du ministère du Travail] quittant Downing Street : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 56199

Letter to William Collver or John Roberts, 1849

A letter to “my dear Mr. Collver and co.” The writer mentions the “circuit” that she has traveled, and a conference which she attended. In regard to the circuit, she talks about her interest in the Welland Canal. The references all seem to be religious in nature. She asks Mr. Collver how he likes the new preacher and says that in a letter that the preacher published in the newspaper he refers to the “breaking of Jordan Chapel”. She says that a society of teetotalers has been established in her town and they are known as “Sons of Temperance”. She also mentions “my man Brown” who was there but has left, leaving her to have the circuit by herself. She signs off with “I am yours affectionately [Eleanor Corman]. The second part of the letter is addressed to “my dear Mr. Roberts”. She asks him for some music that she would like, but cannot find in Kingston. She would like him to “come down and teach singing” this winter. She also asks him to give her regards to Mr. P. Beamer and family. She ends this part of the letter with “Nothing further yours affectionately [Eleanor Corman]”. There are 4 red postmarks on the outside of the letter and they are: Picton, July 31, 1849 Cobourg, August 2, 1849 St. Catharines, August 4, 1849 There is one other postmark which is too faded to be legible.

Letter to William Hamilton Merritt from George Roberts

Letter to William Hamilton Merritt from George Roberts who is looking for employment as a clerk (3 pages, handwritten), Dec. 3, 1856.