The distribution of some plankton animals in the English Channel and approaches: ii. Surveys with the Gulf iii high-speed sampler, 1958-60

Abstract

SUMMARYComparison of the recent surveys with investigations back to 1903 confirms earlier suggestions of a general tendency towards an increase in southern forms (including south-western species) and a decrease in northern forms (including north-western species) in the western English Channel, although there has been considerable fluctuation from time to time. These and other biological changes in the area during the past 58 years are believed to be largely a result of rising temperatures and a consequent general shifting of boundaries of distribution. There appears to be no real evidence that the changes in plankton distribution are due to a change in fertility in the water or of variation in strength of inflow of oceanic water. However, these aspects cannot be separated from the changes that have taken place in populations of fish, and will be discussed further in a later paper.

Horizontal and vertical distribution of cirripede cyprid larvae in an upwelling system off the Portuguese coast

“…They were not found > 40 km from the coast, a maximum dispersal range similar to that found for cyprids of coastal species in other geographical areas (Southward 1962, Ardisson et al 1990). Neuston net sampling was not carried out on the WP-2 grid, but the surface layer has been shown in other studies (Le Fèvre & Bourget 1991, Rawlinson et al 2005, and in neuston sampling at the fixed station, to be where high numbers of cyprids can be found.…”

Hydroclimatic relationships with planktonic time series from 1975 to 1992 in the North Sea off Gravelines, France

“…5h) showed a clearly recognizable yearly cycle. The geographical distribution of this chaetognath is more coastal (Oresland 1983) than that of Sagitta elegans, which is also considered to be a good descriptor of long-term climatic fluctuations, from the research conducted by Russell (1935Russell ( , 1936Russell ( , 1939 and Southward (1962Southward ( , 1980Southward ( , 1984. This coastal species is widely distributed: it is found in the North Sea and the Channel, as well as in the Mediterranean Sea (Dallot 1978) and the Black Sea (Furnestin 1958).…”

New alien barnacles in the Azores and some remarks on the invasive potential of Balanidae

“…Hawaii, see Matsui et al 1964). It is a typical fouling species introduced in Europe about 100 years ago and is well established in waters of reduced salinity in the Mediterranean and in the southern Bay of Biscay (Southward 1962). A. eburneus (Fig.…”