scholarly journals Contrasting life histories of the predatory cladocerans Leptodora kindtii and Bythotrephes longimanus

2005 ◽  
Vol 27 (6) ◽  
pp. 569-585 ◽  
Author(s):  
Donn K. Branstrator
Keyword(s):  
Life Histories ◽  
Bythotrephes Longimanus ◽  
Leptodora Kindtii

scholarly journals Leptodora kindtii Population Dynamics in the Island Region of Western Lake Erie before and after the Invasion of the Predacious Cladoceran Bythotrephes longimanus

2016 ◽  
Vol 116 (2) ◽  
pp. 1
Author(s):  
K. E. Simpson ◽  
W J Edwards ◽  
Douglas Donald Kane
Keyword(s):  
Native Species ◽  
Lake Erie ◽  
Niche Overlap ◽  
Current Data ◽  
Bythotrephes Longimanus ◽  
Western Basin ◽  
Leptodora Kindtii ◽  
Western Lake ◽  
Before And After ◽  
Marked Decline

Competition among native and non-native species can cause decreases in population size and production of both species.  The native predaceous crustacean zooplankter Leptodora kindtii shares a similar niche with the invasive Bythotrephes longimanus in Lake Erie.  This niche overlap may contribute to the decline in abundance and production of Leptodora in the western basin of Lake Erie.  Historical (1946) and recent (2006) data were used to determine if the decline in Leptodora abundance and production was associated with the effects of Bythotrephes, which invaded Lake Erie in the mid-1980’s.  Pre-invasion abundances and lengths of L. kindtii were compared with current data (2006).  A change in prey community abundance, composition and dynamics were observed, relative to pre-invasion, with a marked decline in.abundance and size of L. kindtii after the invasion of Bythotrephes. Competition for food and direct predation are two explanations, among others, for the declines observed in L. kindtii size, abundance and production that have occurred since B. longimanus invasion.

Temporal and spatial separation allow coexistence of predatory cladocerans: Leptodora kindtii, Bythotrephes longimanus and Cercopagis pengoi, in southeastern Lake Michigan

2010 ◽  
Vol 36 ◽  
pp. 65-73 ◽  
Author(s):  
Joann F. Cavaletto ◽  
Henry A. Vanderploeg ◽  
Radka Pichlová-Ptáčníková ◽  
Steven A. Pothoven ◽  
James R. Liebig ◽  
...  
Keyword(s):  
Lake Michigan ◽  
Spatial Separation ◽  
Bythotrephes Longimanus ◽  
Cercopagis Pengoi ◽  
Leptodora Kindtii ◽  
Temporal And Spatial

Hypoxia modifies planktivore–zooplankton interactions in Lake Erie

2012 ◽  
Vol 69 (12) ◽  
pp. 2018-2028 ◽  
Author(s):  
Steven A. Pothoven ◽  
Henry A. Vanderploeg ◽  
Tomas O. Höök ◽  
Stuart A. Ludsin
Keyword(s):  
Lake Erie ◽  
Osmerus Mordax ◽  
Large Prey ◽  
Bythotrephes Longimanus ◽  
Rainbow Smelt ◽  
Leptodora Kindtii ◽  
Vertical Distributions ◽  
Consumption Rates ◽  
High Concentrations ◽  
Zooplankton Production

We evaluated vertical distributions of fish and zooplankton, planktivore consumption, and prey production in Lake Erie during 2005 to determine how hypolimnetic hypoxia alters fish (i.e., rainbow smelt (Osmerus mordax) and emerald shiners (Notropis atherinoides)) and invertebrate planktivore (i.e., Bythotrephes longimanus and Leptodora kindtii) relationships with their mesozooplankton prey. Hypoxia concentrated 45%–76% of fish into a narrow (<2 m) metalimnetic layer, but only 3%–13% of zooplankton production was in this layer. The epilimnion may have served to some degree as a refuge for mesozooplankton because high temperatures may have excluded rainbow smelt. High concentrations of fish above the hypolimnion likely resulted in increased competition for large prey (i.e., predatory claodcerans). Although hypoxia did not result in overall high predation demands by planktivores relative to total zooplankton production, planktivore consumption rates within the metalimnion exceeded zooplankton production in that layer.

The North American invasive zooplanktivore Bythotrephes longimanus is less hypoxia-tolerant than the native Leptodora kindtii

2017 ◽  
Vol 74 (6) ◽  
pp. 824-832 ◽  
Author(s):  
Michael L. Sorensen ◽  
Donn K. Branstrator
Keyword(s):  
Climate Change ◽  
Landscape Scale ◽  
Tolerance Limit ◽  
Hypoxia Tolerance ◽  
Bythotrephes Longimanus ◽  
Water Flea ◽  
Leptodora Kindtii ◽  
The North ◽  
Species Survival ◽  
Predatory Cladoceran

The predatory cladoceran Bythotrephes longimanus (spiny water flea) has been invading lakes and damaging food webs across the central part of North America since the early 1980s. To understand its niche and that of the taxonomically related and native predatory cladoceran Leptodora kindtii, we investigated species survival after 12 h exposures to low dissolved oxygen (DO) concentrations in the laboratory. Bythotrephes longimanus (n = 690) exhibited a hypoxia tolerance limit (LC50) of 1.65 mg·L−1 DO (95% confidence interval: 1.59, 1.72 mg·L−1) and was significantly less tolerant of hypoxia than L. kindtii (n = 380), which exhibited an LC50 of 0.58 mg·L−1 DO (0.51, 0.65 mg·L−1). These lab-based physiological results are consistent with landscape-scale observations that B. longimanus successfully invades primarily mesotrophic and oligotrophic lakes, while L. kindtii inhabits a wider range of lakes that includes eutrophic ones. Climate change throughout the 21st century may increase the occurrence and severity of hypoxia in the hypolimnia of lakes and may provide a growing barrier to B. longimanus invasion.

Life Histories of Patients With Chronic Ulcerative Colitis: A Review of 2,000 Cases

1950 ◽  
Vol 16 (1) ◽  
pp. 25-38 ◽  
Author(s):  
Wyman P. Sloan ◽  
F. Arnold Bargen ◽  
Robert P. Gage
Keyword(s):  
Ulcerative Colitis ◽  
Chronic Ulcerative Colitis ◽  
Life Histories

Power and politics in migration narrative methodology: Research with young Congolese migrants in Uganda

2009 ◽  
Vol 6 (2) ◽  
pp. 131-141 ◽  
Author(s):  
Christina Clark-Kazak
Keyword(s):  
Qualitative Research ◽  
Young People ◽  
Life Histories ◽  
Narrative Research ◽  
Power Dynamics ◽  
Methodological Issues ◽  
Personal Boundaries ◽  
Migration Narratives ◽  
Narrative Methodology

This paper explores the power dynamics inherent in qualitative research involving migration narratives. Drawing on the author’s experiences collecting life histories and constructing narratives of Congolese young people in Uganda, this article addresses the ethical and methodological issues of representivity, ownership, anonymity and confidentiality. It also explores the importance of investment in relationships in migration narrative research, but also the difficulties that arise when professional and personal boundaries become blurred.

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