Population structure, habitat preferences, feeding strategies, and diet of the brittle star Ophiopholis aculeata in nearshore and offshore habitats of the northwest Atlantic

2021 ◽  
Vol 140 (3) ◽  
Author(s):  
Fanny Volage ◽  
Jean‐François Hamel ◽  
Annie Mercier
Keyword(s):  
Population Structure ◽  
Habitat Preferences ◽  
Brittle Star ◽  
Feeding Strategies ◽  
Northwest Atlantic

Evidence supporting panmixia in Greenland halibut (Reinhardtius hippoglossoides) in the Northwest Atlantic

2014 ◽  
Vol 71 (5) ◽  
pp. 763-774 ◽  
Author(s):  
Denis Roy ◽  
David C. Hardie ◽  
Margaret A. Treble ◽  
James D. Reist ◽  
Daniel E. Ruzzante
Keyword(s):  
Population Structure ◽  
Population Genetic ◽  
Conservation Strategies ◽  
Greenland Halibut ◽  
Northwest Atlantic ◽  
Population Genetic Differentiation ◽  
Conservation Implications ◽  
Greenland Halibut Reinhardtius Hippoglossoides ◽  
Reinhardtius Hippoglossoides ◽  
Species Specific

Assessment of population structure is critical to the design and implementation of sound management and conservation strategies. However, population structure must be assessed using markers attuned to population genetic processes such as genetic drift and gene flow, which reflect actual levels of reproductive isolation among putative genetic clusters. This is critical for highly exploited, commercial species that form the backbone of regional and local economies. Here, we show extremely low levels of population genetic differentiation among Greenland halibut (Reinhardtius hippoglossoides) collected from throughout the Northwest Atlantic, which cannot be statistically differentiated from panmixia using 12 species-specific polymorphic microsatellite markers. In contrast, some previous studies have demonstrated significant differences among individuals collected from various parts of the species’ range using a variety of both genetic and nongenetic techniques. In accordance with other reports and consistent with the species’ life history, we demonstrate that the most parsimonious explanation reconciling observed patterns is a repeated high degree of local differentiation of new recruits and colonizers originating from a common gene pool. Such a scenario has important conservation implications in terms of devising more appropriate strategies balancing species persistence and replenishment with sustainable resource use.

Population structure, movement and habitat preferences of the purple-spotted gudgeon, Mogurnda adspersa

2002 ◽  
Vol 53 (5) ◽  
pp. 909 ◽  
Author(s):  
George D. Boxall ◽  
John J. Sandberg ◽  
Frederieke J. Kroon
Keyword(s):  
Population Structure ◽  
Habitat Preference ◽  
Habitat Preferences ◽  
Pool Size ◽  
Habitat Characteristics ◽  
Effective Management ◽  
Prominent Feature ◽  
Management Options ◽  
Point Sampling ◽  
Far North

We examined the movement patterns and habitat preferences of Mogurnda adspersa in Pattersons Creek, a small, low-order, rainforest creek in Gillies Range State Forest, Far North Queensland, Australia. First, we conducted a capture and recapture study to document population structure and individual movements. Our results show that movement is a prominent feature of population behaviour of M. adspersa, with male gudgeons moving significantly more between pools than females, irrespective of gudgeon size. Second, we quantitatively described habitat characteristics of rainforest pools using point sampling. This data was then combined with capture data to describe the habitat preference of M. adspersa. Our results show that the number of gudgeons was positively related to pool size and decreased with increasing pool velocity. We discuss the results in light of effective management options for the species habitat in general, and Far North Queensland in particular.

Combining microsatellites and geometric morphometrics for the study of redfish (Sebastes spp.) population structure in the Northwest Atlantic

2014 ◽  
Vol 154 ◽  
pp. 102-119 ◽  
Author(s):  
Alexandra E. Valentin ◽  
Xavier Penin ◽  
Jean-Pierre Chanut ◽  
Don Power ◽  
Jean-Marie Sévigny
Keyword(s):  
Population Structure ◽  
Geometric Morphometrics ◽  
Northwest Atlantic

scholarly journals The Northwest Atlantic deep-sea red crab (Chaceon quinquedens) population before and after the onset of harvesting

2008 ◽  
Vol 65 (6) ◽  
pp. 862-872 ◽  
Author(s):  
Richard A. Wahle ◽  
Charlene E. Bergeron ◽  
Antonie S. Chute ◽  
Larry D. Jacobson ◽  
Yong Chen
Keyword(s):  
Population Structure ◽  
Adverse Effects ◽  
New England ◽  
Deep Sea ◽  
Carapace Width ◽  
Biological Information ◽  
Trawl Survey ◽  
Northwest Atlantic ◽  
Southern New England ◽  
Before And After

Abstract Wahle, R. A., Bergeron, C. E., Chute, A. S., Jacobson, L. D., and Chen, Y. 2008. The Northwest Atlantic deep-sea red crab (Chaceon quinquedens) population before and after the onset of harvesting. – ICES Journal of Marine Science, 65: 862–872. The population structure of deep-sea red crab (Chaceon quinquedens) in a nearly unexploited state is compared with its condition three decades later after more than a decade of sustained harvesting. Our study is based on a camera and net trawl survey conducted in 1974, which we repeated between 2003 and 2005 on the southern New England shelf break. Although the overall biomass of red crabs was estimated to be higher than in 1974, the abundance of large males, which are targeted by the fishery, was considerably lower. In particular, the biomass of large males (≥114 mm carapace width), considered in 1974 to be marketable, declined by 42%. Declines were most evident at depths and regions most accessible to the fishing fleet based in southern New England. With the change in fishery selectivity towards smaller male crabs, the abundance of currently harvestable crabs is about equal to 1974 levels. No declines were observed in the biomass of female and smaller male crabs not targeted by the fishery. Indeed, the abundance of juveniles appears considerably higher than in 1974. Perhaps, adverse effects on reproduction attributable to a reduction in the numbers of large males may be a consequence of fishing, but fishery impacts and productivity are difficult to assess because key biological information is lacking.

scholarly journals Foraminiferal stratigraphy and palaeoecological implications in turbidite-like deposits from the Early Tortonian (Late Miocene) of Greece

2007 ◽  
Vol 26 (2) ◽  
pp. 145-158 ◽  
Author(s):  
H. Drinia ◽  
A. Antonarakou ◽  
N. Tsaparas ◽  
M. D. Dermitzakis
Keyword(s):  
Habitat Preferences ◽  
High Energy ◽  
Environmental Stability ◽  
Ecological Niches ◽  
Feeding Strategies ◽  
Sedimentary Environments ◽  
Bottom Waters ◽  
Broad Variety ◽  
Consistent Picture ◽  
Of Greece

Abstract. The Lower Tortonian Ag. Giannis section, in Gavdos Island, Greece, consists of an outer neritic to upper bathyal, marly hemipelagic sequence which is interrupted by thick turbidite-like sandy deposits. During deposition of the marly intervals, reworking was considerably reduced.This paper contributes to knowledge concerning benthic foraminiferal response to dynamic sedimentary environments. Important palaeoecological information for benthic foraminiferal assemblages was gathered and analyzed in order to create a regionally consistent picture of the palaeoenvironment. Samples were analyzed statistically in order to identify the different palaeoenvironmental settings during turbiditic sedimentation. Undisturbed basal marls of the section are characterized by the predominance of a diversified Uvigerina striatissima assemblage typified by a broad variety of morphotypes with different inferred habitat preferences and feeding strategies, indicating rather well-oxygenated bottom waters. This environmental stability was subsequently disrupted by recurrent deposition of turbidite-like sands. A low-diversity Valvulineria complanata-Globobulimina sp. assemblage is dominant in this part of the succession, as these specialized endobenthic species could keep pace with high-energy sedimentary settings. Just above the turbidites, a “recolonization” fauna (Bolivina alata assemblage), composed entirely of infaunal elements is observed, indicating a nutrient-rich substrate. This oligotypic fauna is later replaced by a more diversified microfauna capable of occupying a wider range of ecological niches.

scholarly journals The blood sucking on human by Placobdella costata (O. F. Müller, 1846) (Hirudinida: Glossiphoniidae) - case study with notes on body form

2021 ◽  
Author(s):  
Joanna Cichocka ◽  
Aleksander Bielecki ◽  
Izabela Jablonska-Barna ◽  
Łukasz Krajewski ◽  
Katarzyna Topolska ◽  
...  
Keyword(s):  
Parental Care ◽  
Human Blood ◽  
Potential Role ◽  
Habitat Preferences ◽  
Feeding Strategies ◽  
Body Form ◽  
Blood Sucking

Abstract: 1. In our paper four events of blood sucking on human by Placobdella costata were described. 2. Human blood was sucked by both adults and juvenile specimens of P. costata. 3. The feeding strategies of juveniles under parental care are presented. 4. New data of juvenile specimens body form are presented. 5. Information on the potential role of mammals in species dispersion and habitat preferences of leeches are under consideration.

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