Distribution and Seasonal Population Changes of Campecopea Hirsuta [Isopoda: Flabellifera]

Jaera nordmanni (Rathke) occurs abundantly beneath stones and algae in freshwater streams (McCartan & Slinn, 1953), brackish water pools (Naylor & Slinn, 1958), and estuaries (Naylor, Slinn & Spooner, 1961; Harvey, Jones & Naylor, 1973). The species is widely distributed and ranges from the Black and Mediterranean Seas south to the Azores, and north to the west coast of Scotland (Naylor, 1972). Three forms of J. nordmanni have been described (Lemercier, 1958, i960) of which only Jaera nordmanni nordica Lemercier has been recorded in Britain (Naylor, 1972; Jones & Fordy, 1973). The two other forms, Jaera nordmanni nordmanni Lemercier and Jaera nordmanni massiliensis Lemercier, have a more southerly distribution (Naylor, 1972), and can be separated from J. nordmanni nordica by differences in male sex characters (Lemercier, 1958, 1960; Jones & Fordy, 1973). Apart from some eco-physiological work (Naylor et al. 1961; Harvey et al. 1973) and a recent study with a scanning electron microscope (Jones & Fordy, 1973), little is known of the biology of J. nordmanni. The present paper reports on the breeding biology and seasonal population fluctuations of Jaera nordmanni nordica, and compares the results with a similar study on the members of the Jaera albifrons Leach group of species (Jones & Naylor, 1971) which are closely related to and often in competition with J. nordmanni.

Section: Discussionmentioning

confidence: 99%

Breeding Biology and Seasonal Population Changes ofJaera Nordmanni NordicaLemercier [Isopoda, Asellota]

Jones

1974

“…(Naylor, 1955(Naylor, ,1972Salemaa, 1979). Habitats where the presence of isopods has been reported include mussel beds, lichens, boulders, freshwater streams, brackish water pools, rock crevices, algae and among barnacles, ascidians and sponges (Harvey, 1968;Holdich, 1970Holdich, , 1976Jansen, 1971;Carefoot, 1973;Jones, 1974;Healy & O'Neill, 1984). The presence of isopods in macroalgaldominated communities is well documented in all tidal levels, often being the dominant faunistic group (Holdich, 1968(Holdich, , 1970Jansson & Matthiesen, 1971;Nicotri, 1980;Healy & O'Neill, 1984).…”

Section: Introductionmentioning

confidence: 99%

Distribution of intertidal isopods in relation to geographical changes in macroalgal cover in the Bay of Biscay

Arrontes

Anadón

1990

The distribution of intertidal isopods with respect to algal species was investigated over a range of 250 km on the shores of north Spain. A survey of 25 localities included three zones with a distinct composition of algal species: a western zone comprising shores facing Atlantic waters and the outer part of the Bay of Biscay; a narrow transition zone (about 70 km in length); and an eastern zone extending to the inner part of the Bay of Biscay. Thirty two isopod species were collected, 11 of which were present in high densities. Response to geographical change was observed to occur clearly in three species, Ischyromene lacazei, Idotea pelagica and /. baltica, and to a lesser degree in /. granulosa; the former two and the latter two were abundant in the eastern and western zones respectively. All four species were found to be closely associated with macroalgae species which display geographical changes in abundance (e.g. Laminaria ochroleuca and Comllina elongata). In addition, Idotea species were found to inhabit a reduced number of algal species compared with other European shores. Spanish shore of the Bay of Biscay probably constitutes the geographic limit of the distribution of the four species. A sampling artefact might also be responsible to some extent for the patterns of distribution observed. Differences in the physico-chemical properties of sea water along the coast and circulation of coastal waters are not thought to influence the distribution of isopods.

“…Despite being recorded from Wales and south-western England (Harvey, 1968), the Atlantic coasts of France (Hesse, 1873;Maury, 1929), Spain (Arrontes & Anado¨n, 1990), Portugal (present study), and north-west Africa (Monod, 1931a,b) only a few studies have been carried out on this species (Panouse, 1940;Tetart, 1962Tetart, , 1963Wieser, 1963;Harvey, 1968). No records are known from Madeira and C. hirsuta is recorded here for the ¢rst time from the Canary Islands and also from the Azores.…”

Section: Distributionmentioning

confidence: 99%

“…Found inhabiting the upper zones of exposed and semiexposed rocky shores, sometimes down to mid-tide level (Harvey, 1968). Usually found associated with crevices, empty barnacle tests and lichens (e.g.…”

Section: Ecologymentioning

confidence: 99%

“…As Omer-Cooper & Rawson (1934) pointed out, the fact that so few collectors work seriously in the region of the hightide mark means that C. hirsuta has not been recorded in many surveys of the rocky littoral. Monod (1931b) mentions C. hirsuta as occurring in Ireland, but there were no published localities in his work or elsewhere, and Harvey (1968) failed to ¢nd the species in western Ireland. Alan Myers has informed us (personal communication) that C. hirsuta does occur on rocky shores at Tragumna, Talispeen and Dunmanus Bay, all County Cork, Ireland, and it has been recently recorded from Lough Hyne (de Grave & Holmes, 1998).…”

Section: Distributionmentioning

confidence: 99%

See 1 more Smart Citation

Revision of the isopod crustacean genus Campecopea (Flabellifera: Sphaeromatidae) with discussion of the phylogenetic significance of dorsal processes

Bruce¹,

Holdich²

2002

The sphaeromatid crustacean isopod genus Campecopea is revised, a new diagnosis given and the genus Anoplocopea Racovitza, 1907, is placed in synonymy; the type species Campecopea hirsuta is redescribed and Campecopea lusitanica comb. nov. is recorded from the Canary Islands and Azores. The four species of Campecopea differ from each other principally in the presence or absence of a prominent posteriorly directed dorsal process on the male pereonite 6, the ornamentation of the posterior pereonites, the shape of the uropods and also the fine details of the dactylus accessory spine (smooth or serrate). The phylogenetic significance of dorsal process is re-evaluated here, and the character discussed in relation to Campecopea, Dynoides and Clianella, and several other sphaeromatid genera. It is regarded that the interpretation of this character as being of intrinsic generic merit has resulted in the over splitting of several genera and also the creation of paraphyletic genera. It is suggested that reappraisal of sphaeromatid generic characters in cladistic terms is a necessary first step in terms of establishing the monophyly of many sphaeromatid genera.