The developmental stages of a species of Corycaeus (Copepoda: Cyclopoida) from Saanich Inlet, British Columbia

1978 ◽  
Vol 56 (1) ◽  
pp. 66-74 ◽  
Author(s):  
Victoria R. Gibson ◽  
George D. Grice
Keyword(s):  
British Columbia ◽  
Population Dynamics ◽  
Developmental Stages ◽  
Marine Ecosystems ◽  
Postembryonic Development ◽  
Cyclopoid Copepod ◽  
Saanich Inlet ◽  
Water Columns ◽  
Copepoda Cyclopoida

The postembryonic development of a species of the cyclopoid copepod genus Corycaeus from Saanich Inlet, British Columbia, is described and illustrated. Specimens were obtained from a large (40 000/m3) population of Corycaeus which developed in the control (unperturbated) enclosure of a Controlled Ecosystem Pollution Experiment studying the effects of copper on marine ecosystems. Population dynamics of the species in the 1700-m3 enclosed water columns are discussed.

Scattering of Underwater Sound in Saanich inlet, British Columbia

Nature ◽  
1962 ◽  
Vol 194 (4823) ◽  
pp. 36-37 ◽  
Author(s):  
B. M. BARY ◽  
W. E. BARRACLOUGH ◽  
R. HERLINVEAUX
Keyword(s):  
British Columbia ◽  
Underwater Sound ◽  
Saanich Inlet

scholarly journals Population dynamics of pre-imaginal stages of olive fruit fly Bactrocera oleae Gmel. (Diptera, Tephritidae) in the region of Bar (Montenegro)

2013 ◽  
Vol 28 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Tatjana Perovic ◽  
Snjezana Hrncic
Keyword(s):  
Population Dynamics ◽  
Developmental Stages ◽  
Fruit Fly ◽  
Bactrocera Oleae ◽  
Yield Reduction ◽  
Olive Fruit Fly ◽  
Application Timing ◽  
Olive Fruit ◽  
Fruit Drop

Olive fruit fly is the most harmful pest of olive fruits and important for oil production. Damage involves yield reduction as a consequence of premature fruit drop, but also a reduced quality of olive oil and olive products. There is little available data regarding the biology of Bactrocera oleae in Montenegro. Knowledge of the pest life cycle and development would improve optimization of insecticide application timing and protection of fruits, and reduce adverse effects on the environment. Investigation was conducted on the Zutica variety in an olive grove located in Bar during a three-year period. Population dynamics of the pre-imaginal stages and level of fruit infestation were monitored from mid-July until the end of October. The results of this three-year investigation showed that the beginning of infestation was always at the end of July. It was also found that, depending on environmental conditions, the level of infestation was low until the end of August. In September and October it multiplied, and reached maximum by the end of October. Regarding infestation structure, eggs and first instar larvae were the dominant developmental stages of the pest until the middle of September. From mid-September until mid-October all developmental stages (eggs, larvae, pupae) were equally present in infested fruits. Pupae, cocoons and abandoned galleries prevailed until the harvest.

The comparative ecology and evidence for resource partitioning in two pholidid fishes (Pisces: Pholididae) from southern British Columbia eelgrass beds

1985 ◽  
Vol 63 (1) ◽  
pp. 76-85 ◽  
Author(s):  
Grant W. Hughes
Keyword(s):  
British Columbia ◽  
Activity Patterns ◽  
Prey Type ◽  
Microhabitat Use ◽  
Similar Species ◽  
Intertidal Habitat ◽  
Comparative Ecology ◽  
Saanich Inlet ◽  
Breeding Habitats ◽  
Eelgrass Beds

A comparative analysis of the ecology of sympatrically occurring Pholis laeta and Pholis ornata was conducted in Saanich Inlet, British Columbia. Summer microhabitat use of eelgrass bed depths, intertidal habitat use, prey type, and characteristic location of prey taken differed in fish older than 1 year and may have facilitated the coexistence of these morphologically similar species. Prey sizes and activity patterns were similar between species. Winter segregation of the species during the breeding season may have reduced the possibility of hybridization. Competition for breeding habitats and differences in trophic apparatus may partly explain the observed patterns of resource use.

Genome-wide Assessment Elucidates Connectivity and the Evolutionary History of the Highly Dispersive Marine Invertebrate Littoraria Flava (Littorinidae:Gastropoda)

2020 ◽  
Author(s):  
Thainá Cortez ◽  
Rafael Viana Amaral ◽  
Thadeu Sobral-Souza ◽  
Sonia Andrade
Keyword(s):  
Population Dynamics ◽  
Species Distribution ◽  
Marine Invertebrate ◽  
Demographic History ◽  
Population Expansion ◽  
Marine Ecosystems ◽  
Assignment Test ◽  
Niche Modelling ◽  
Marine Gastropod ◽  
Haplotype Networks

Abstract Background: An important goal of population genetics studies in marine ecosystems is understanding how connectivity patterns, both spatial and temporal, are influenced by historical and evolutionary factors. When it comes to dispersion and connectivity in marine ecosystems, the role of historical and evolutionary factors over population dynamics andstructure still remains enigmatic. We evaluated the demographic history and population structure of Littoraria flava, a highly dispersive and widely distributed marine gastropod on the Brazilian intertidal zone, to predict the effects of such factors on intrapopulation divergence. To test the hypotheses that (1) the species has historically high levels of geneflow on a macrogeographic spatial scale and (2) the species distribution in rocky shores consists of subpopulations due to high degrees of environmental heterogeneity, we collected specimens along the Brazilian coastline and combined different sets of genetic markers (mitochondrial DNA, nuclear internal transcribed spacer 2, and single nucleotide polymorphisms) with niche-based modeling to predict species paleodistribution.Results: Low genetic structure was observed along the coastline, and all clustering and migration analyses supported the high gene flow over long distances hypothesis (> 3,000 km). Three genetic clusters were identified by the assignment test, each mostly composed of individuals from the three sampled regions. No fine-scale variation was observed for any location. The neutrality tests and the haplotype networks suggest that L. flava had experienced population bottleneck followed by population expansion. Both paleodistribution and coalescent simulations highlight that expansion events occurred in the Southeastern coastline during the Pleistocene interglacial cycles (21 kya).Conclusions: This is the first study on the South American coast that highlights the demographic history on a marine gastropod based on genomic markers associated with niche modelling. We found that climatic changes since the interglacial periods are potentially relevant drivers for the species distribution in the past. Our findings could enhance the understanding of the population dynamics under an evolutionary view for widely distributed non-model marine organisms.

A bioeconomic optimization approach for rebuilding marine communities: British Columbia case study

2009 ◽  
Vol 36 (4) ◽  
pp. 301-311 ◽  
Author(s):  
C. H. AINSWORTH ◽  
T. J. PITCHER
Keyword(s):  
British Columbia ◽  
Cost Benefit Analysis ◽  
Natural Capital ◽  
Cost Benefit ◽  
Single Species ◽  
Marine Ecosystems ◽  
Optimization Approach ◽  
Specific Biomass ◽  
Suitable Framework ◽  
Search Routine

SUMMARYMany marine ecosystems are depleted of living resources as a result of long-term overexploitation. Restoration plans should perhaps consider the entire ecosystem as opposed to single species, yet there is currently no suitable framework available for the design and comparison of whole-ecosystem restoration trajectories. This paper presents a novel addition to Ecopath with Ecosim's policy search routine, the ‘specific biomass’ objective function, which allows gaming scenarios to be run using selective fishing as a tool to rebuild depleted marine ecosystems or modify them into a preferred state. In this paper, restoration scenarios aimed to restore an ecosystem in Northern British Columbia to a state similar to the historic ecosystem of 1950 AD. Restoration plans that achieve restoration quickly tend to require a large sacrifice in fishery profits, while slower plans allow for continued harvest benefits. A convex relationship between profit and recovered biodiversity suggests that there may be an optimal rate of restoration. Cost-benefit analysis demonstrates that conservative restoration plans can offer a rate of return superior to bank interest when viewed as an investment in natural capital. Increasing the selectivity of fishing gear improves the economic outlook.

A new hydrozoan, Geomackiea zephyrolata gen. nov., sp. nov. (Anthomedusae: Pandeidae), from inland marine waters of British Columbia and Washington State

1985 ◽  
Vol 63 (9) ◽  
pp. 2172-2175
Author(s):  
Claudia E. Mills
Keyword(s):  
British Columbia ◽  
New Genus ◽  
Washington State ◽  
Marine Waters ◽  
Gonad Morphology ◽  
Saanich Inlet ◽  
The Family ◽  
Friday Harbor ◽  
Vertical Distributions

The hydromedusa Geomackiea zephyrolata gen. nov., sp. nov. is described and illustrated. It has been placed in the subfamily Protiarinae of the family Pandeidae on the basis of its stomach and gonad morphology and the four large perradial tentacles with conical basal bulbs. A new genus has been erected because the medusa is supplied with four broad interradial bulbs, each rimmed by up to eight closely packed solid tentaculae. A total of 29 specimens with bell heights of 0.9–3.5 mm have been collected in the plankton of Saanich Inlet, British Columbia, and Friday Harbor, Washington, between 1978 and 1981. Juvenile as well as adult specimens are described and the cnidome, gametes, seasonal and vertical distributions, and taxonomic affinities within the family Pandeidae are discussed.

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