Population structure of the barnacle, Semibalanus balanoides (Cirripedia, Thoracica), across intertidal environmental stress gradients in northern Nova Scotia, Canada

Crustaceana ◽  
2008 ◽  
Vol 81 (6) ◽  
pp. 725-736 ◽  
Author(s):  
Ricardo Scrosati ◽  
Elizabeth Macpherson
Keyword(s):  
Population Structure ◽  
Nova Scotia ◽  
Environmental Stress ◽  
Semibalanus Balanoides ◽  
Stress Gradients

Tracking environmental stress gradients using three biotic integrity indices: Advantages of a locally-developed traits-based approach

2013 ◽  
Vol 34 ◽  
pp. 560-570 ◽  
Author(s):  
I.F. Rodil ◽  
A.M. Lohrer ◽  
J.E. Hewitt ◽  
M. Townsend ◽  
S.F. Thrush ◽  
...  
Keyword(s):  
Environmental Stress ◽  
Biotic Integrity ◽  
Stress Gradients

Relationship Between Destructive Grazing by the Sea Urchin, Strongylocentrotus droebachiensis, and the Abundance of American Lobster, Homarus americanus, on the Atlantic Coast of Nova Scotia

1981 ◽  
Vol 38 (11) ◽  
pp. 1339-1349 ◽  
Author(s):  
W. G. Wharton ◽  
K. H. Mann
Keyword(s):  
Population Structure ◽  
Nova Scotia ◽  
Sea Urchins ◽  
Atlantic Coast ◽  
Homarus Americanus ◽  
Strongylocentrotus Droebachiensis ◽  
American Lobster ◽  
History Of ◽  
Kelp Bed ◽  
The Relationship

Relationships between percentage cover of macroalgae, population structure of sea urchins (Strongylocentrotus droebachiensis), and the history of the lobster fishery were examined at nine sites distributed along the Atlantic coast of Nova Scotia from Guysborough County in the northeast to Pubnico in the southwest. At Pubnico there was dense algal cover and a small number of urchins living in crevices, and at Cape Sable there was an area of transition, but at all other sites there were urchin-dominated barren grounds. When the population structure of the urchins was compared with that previously observed in St. Margaret's Bay before, during, and after destruction of beds of kelp (Laminaria spp. and Agarum) by overgrazing, it was concluded that kelp bed destruction occurred on the coast north of Halifax prior to 1970, and on the coast south of Halifax after 1970. From the records of American lobster (Homarus americanus) catches it was concluded that a critical decline in catches at each site occurred a few years after kelp bed destruction. Information from various sources is synthesized into a coherent theory of the relationship between lobsters, other predators, sea urchins, and kelp.Key words: lobsters, Homarus americanus; sea urchins, Strongylocentrotus droebachiensis; destructive grazing, kelp, Laminaria, Agarum

Biodiversity effects on ecosystem functioning change along environmental stress gradients

2013 ◽  
Vol 16 (4) ◽  
pp. 568-569 ◽  
Author(s):  
Bastian Steudel ◽  
Andy Hector ◽  
Thomas Friedl ◽  
Christian Löfke ◽  
Maike Lorenz ◽  
...  
Keyword(s):  
Environmental Stress ◽  
Ecosystem Functioning ◽  
Stress Gradients ◽  
Biodiversity Effects

Biodiversity effects on ecosystem functioning change along environmental stress gradients

2012 ◽  
Vol 15 (12) ◽  
pp. 1397-1405 ◽  
Author(s):  
Bastian Steudel ◽  
Andy Hector ◽  
Thomas Friedl ◽  
Christian Löfke ◽  
Maike Lorenz ◽  
...  
Keyword(s):  
Environmental Stress ◽  
Ecosystem Functioning ◽  
Stress Gradients ◽  
Biodiversity Effects

Barnacle recruitment on ice-scoured shores in eastern Canada

2008 ◽  
Vol 88 (2) ◽  
pp. 289-291 ◽  
Author(s):  
Elizabeth A. MacPherson ◽  
Ricardo Scrosati ◽  
Patrick Chareka
Keyword(s):  
Nova Scotia ◽  
Sea Ice ◽  
Structural Complexity ◽  
Semibalanus Balanoides ◽  
Eastern Canada ◽  
Lawrence Estuary ◽  
Selective Pressures ◽  
Larval Behaviour ◽  
Recruitment Patterns ◽  
St Lawrence Estuary

Previous observations in the St Lawrence Estuary (eastern Canada) suggested that larvae of intertidal barnacles (Semibalanus balanoides) would settle almost exclusively inside crevices on shores that are scoured by sea ice every winter. It was suggested that the strong ice scour in winter on that coast (which removes organisms outside of crevices) would select for such a larval behaviour. We tested the generality of this pattern by sampling other ice-scoured shores within the Gulf of St Lawrence system. In particular, we surveyed a shore in Nova Scotia where exposed habitats (subjected to strong ice scour in winter) are interspersed with sheltered habitats (which suffer milder ice scour). Such a topographical complexity might allow for the coastal larval pool to contain a proportion of larvae that have no particular settlement preference for crevices, as selective pressures for such a behaviour would be minimal in ice-sheltered habitats. Consistently with this notion, barnacle recruits (which appear after the winter ice melts) occurred abundantly both inside and outside of crevices across the shore in the spring seasons of 2005 and 2006. Average recruit density on rocky surfaces ranged between 337 and 588 recruits dm−2, depending on the habitat. It is therefore possible that barnacle recruitment patterns on ice-scoured shores may be affected indirectly by the structural complexity of the coast.

Sign in / Sign up

Export Citation Format

Share Document