Geomorphological features drive spatiotemporal dynamics of young‐of‐the‐year brown trout populations in a large New Zealand river catchment

2020 ◽  
Vol 65 (8) ◽  
pp. 1392-1400
Author(s):  
Pavel B. Mikheev ◽  
Matt G. Jarvis ◽  
Christoph D. Matthaei ◽  
Travis Ingram ◽  
Andrey I. Nikiforov ◽  
...  
Keyword(s):  
New Zealand ◽  
Brown Trout ◽  
Spatiotemporal Dynamics ◽  
River Catchment ◽  
Young Of The Year ◽  
Geomorphological Features

Landcover Classification in the Taieri River Catchment, New Zealand: A Focus on the Riparian Zone

1999 ◽  
Vol 14 (3) ◽  
pp. 10-16 ◽  
Author(s):  
Chris J. Arbuckle ◽  
Alexander D. Huryn ◽  
Steven A. Israel
Keyword(s):  
New Zealand ◽  
Riparian Zone ◽  
River Catchment ◽  
Landcover Classification

scholarly journals Co-Management in Theory and Practice: Co-Managing the Waipaˉ River

2021 ◽  
pp. 325-357
Author(s):  
Meg Parsons ◽  
Karen Fisher ◽  
Roa Petra Crease
Keyword(s):  
Decision Making ◽  
New Zealand ◽  
Environmental Justice ◽  
Sustainable Management ◽  
Theory And Practice ◽  
River Catchment ◽  
Aotearoa New Zealand ◽  
Equitable Sharing ◽  
Research Findings ◽  
Formal Recognition

AbstractIn Aotearoa New Zealand, co-management initiatives are increasingly commonplace and are intended to improve sustainable management of environments as well as foster more equitable sharing of power between the settler-state and Indigenous Māori iwi (tribes). In this chapter we examine one such co-management arrangement that recognises and includes Ngāti Maniapoto iwi in decision-making about their ancestral river (the upper section of the Waipā River Catchment) and whether the implementation of initiative translated into tangible benefits for the iwi. Our research findings highlight how co-management agreement is perceived as overwhelming positive by both government and Ngāti Maniapoto representatives. However iwi note that they still face substantive barriers to achieving environmental justice (including the lack of formal recognition of their authority and power, and limited resourcing).

scholarly journals Spatial distribution of soil moisture over 6 and 30cm depth, Mahurangi river catchment, New Zealand

2003 ◽  
Vol 276 (1-4) ◽  
pp. 254-274 ◽  
Author(s):  
David J. Wilson ◽  
Andrew W. Western ◽  
Rodger B. Grayson ◽  
Aaron A. Berg ◽  
Mary S. Lear ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Soil Moisture ◽  
New Zealand ◽  
River Catchment

Prey Fish Dynamics and Salmonine Predator Growth in Lake Ontario, 1978–84

1987 ◽  
Vol 44 (S2) ◽  
pp. s390-s403 ◽  
Author(s):  
Robert O'Gorman ◽  
Roger A. Bergstedt ◽  
Thomas H. Eckert
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Coho Salmon ◽  
Causal Relation ◽  
Lake Ontario ◽  
First Year ◽  
Osmerus Mordax ◽  
Rainbow Smelt ◽  
Poor Growth ◽  
Young Of The Year

The size of hatchery-reared brown trout (Salmo trutta) and coho salmon (Oncorhynchus kisutch), 1 yr after release in Lake Ontario, declined when the stocking of salmonines was increased between 1978 and 1984. The principal prey species, alewife (Alosa pseudoharengus) and rainbow smelt (Osmerus mordax), failed to show the expected, predator-induced downturn in abundance. Instead, rainbow smelt remained moderately abundant and alewives very abundant. During this period, alewife year-classes were small, survival of yearling alewives was poor, growth of young-of-the-year of both alewives and rainbow smelt was slow (growth of most older alewives ceased), and rainbow smelt numbers gradually increased (the much larger alewife population presumably buffered older rainbow smelt from predation by large piscivores). When adult alewife numbers were halved by a winter die-off, the subsequent year-class of alewives was large and growth of brown trout during their first year in the lake increased. This suggested a causal relation between abundance of young alewives and brown trout growth. In the first year coho salmon were at liberty, their growth was related to abundance of young-of-the-year alewives; in their second year it was related to the abundance of yearling alewives and the condition of adult alewives. We hypothesize that abundant adult alewives suppressed production of young-of-the-year fish (necessary prey for salmonines during their first year in the lake) through competition for limited zooplankton production, and thus impeded the transfer of energy from the lowest trophic level to young salmonine predators.

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