Arctic Ocean Bryozoa

Species richness of marine Bryozoa in the continental shelf and slope off Argentina (south‐west Atlantic)

“…On the contrary, the richest stations occurred mainly between 80 and 120 m depth (Fig. Previous studies on other bryozoan faunas have reported contradictory results, since species number was highest between 20 and 80 m in the Western Mediterranean (Ryland, 1970), between 50 and 100 m in the Arctic Ocean (Gontar & Denisenko, 1989), between 50 and 125 m in New England (Schopf, 1969), between 376 and 550 m off South Africa (Hayward & Cook, 1979), and showed either a trend to increase with increasing depth between 22 and 106 m in the English Channel (Grant & Hayward, 1985), or to decrease with increasing depth in a number of circum-Atlantic assemblages (McKinney & Jackson, 1989;Lidgard, 1990). Similarly, Lasta & Bremec (1997) found that the largest and richest scallop beds in the Argentine Sea were located along the 100-m isobath, an area where a high-productivity shelf-break front has been documented (Podestá, 1997).…”

Bryozoan biodiversity in the New Zealand region and implications for marine conservation

“…Previous studies have also observed that the relationship between measures of diversity and depth does not show a simple monotonic trend; rather it is closer to that of a log-normal distribution, where diversity peaks mostly on the shelf at 'moderate' or 'intermediate' depths. Maxima of bryozoan diversity (number of species per sample station) on the shelf have been observed to occur at water depths of 50-125 m in the northwest Atlantic Ocean (Schopf 1969a), 20-80 m in the western Mediterranean Sea (Gautier (1961) in Schopf 1969b), 50-100 m in the Arctic Ocean (Gontar and Denisenko (1989) in López Gappa 2000), 10-75 m in the north Atlantic Ocean (Clarke and Lidgard 2000) and 80-120 m in the southwest Atlantic (López Gappa 2000). Clearly there is a degree of consistency in the diversity-depth observation for continental-shelf environments, and there is a growing convergence towards a consistent explanation.…”

Spatial Patterns of Bryozoan Fauna Biodiversity and Issues of Biogeographic Regionalization of the Chukchi Sea

“…Comparison of the total number of bryozoan species identified in the Chukchi Sea with those found in other Arctic seas indicates that they are nearly equal in taxonomic richness (Gontar and Denisenko, 1989;Gontar 2001Gontar , 2004N. Denisenko, 2008N.…”

“…In recent years, a number of reviews (e.g., Kosobokova et al, 2011;Piepenburg et al, 2011;Josefson et al, 2013) have been based on an increasing number of field expeditions over the past two decades. However, the biodiversity and spatial distribution of bryozoans, in particular, still have not been estimated, although this group is one of the most diverse fauna in the Arctic (Gontar and Denisenko, 1989;Josefson et al, 2013). Chukchi Sea bryozoans were one of the poorest known Arctic faunal types (around 140 species; Kluge, 1962;Gontar and Denisenko, 1989;Gontar, 2001) until recent compilations by N. Denisenko (2008) and N. Denisenko and Kuklinski ABSTRACT.…”

“…However, the biodiversity and spatial distribution of bryozoans, in particular, still have not been estimated, although this group is one of the most diverse fauna in the Arctic (Gontar and Denisenko, 1989;Josefson et al, 2013). Chukchi Sea bryozoans were one of the poorest known Arctic faunal types (around 140 species; Kluge, 1962;Gontar and Denisenko, 1989;Gontar, 2001) until recent compilations by N. Denisenko (2008) and N. Denisenko and Kuklinski ABSTRACT. Based on extensive data from a variety of sources, including RussianAmerican Long-term Census of the Arctic expeditions in 2009 and 2012, this paper provides an update on the richness of bryozoans in the Chukchi Sea and evaluates the variation in bryozoan biodiversity along environmental gradients (e.g., depth, bottom water temperature, and bottom sediment composition).…”