TIMBER HARVEST TRANSFORMS ECOLOGICAL ROLES OF SALMON IN SOUTHEAST ALASKA RAIN FOREST STREAMS

2008 ◽  
Vol 18 (1) ◽  
pp. 4-11 ◽  
Author(s):  
Scott D. Tiegs ◽  
Dominic T. Chaloner ◽  
Peter Levi ◽  
Janine Rüegg ◽  
Jennifer L. Tank ◽  
...  
Keyword(s):  
Rain Forest ◽  
Timber Harvest ◽  
Southeast Alaska ◽  
Ecological Roles ◽  
Forest Streams

Shrimp abundance and habitat relationships in tropical rain-forest streams, Sarawak, Borneo

2003 ◽  
Vol 19 (4) ◽  
pp. 387-395 ◽  
Author(s):  
Tomoya Iwata ◽  
Mikio Inoue ◽  
Shigeru Nakano ◽  
Hitoshi Miyasaka ◽  
Atsushi Doi ◽  
...  
Keyword(s):  
Rain Forest ◽  
Tropical Rain Forest ◽  
Secondary Forest ◽  
High Water ◽  
Water Velocity ◽  
Primary Forest ◽  
Microhabitat Use ◽  
Secondary Forests ◽  
Habitat Differences ◽  
Forest Streams

Microhabitat use and habitat-abundance relationships of four freshwater shrimps, Atyopsis moluccensis, Macrobrachium pilimanus, Macrobrachium trompii and Macrobrachium neglectum, were surveyed in tropical streams running through primary and secondary forests in Borneo, East Malaysia. Underwater observations revealed that A. moluccensis preferred relatively high water velocity and a boulder substrate. Macrobrachium pilimanus also preferred high water velocity and a cobble substrate, whereas M. trompii occupied stream margins with slow current and fine substrates (from POM (particulate organic matter) to pebbles). In contrast, M. neglectum was distributed relatively evenly through the stream channel. The abundance of A. moluccensis, M. pilimanus and M. trompii in the stream reaches was best explained by the abundance of boulders, cobbles and POM, respectively, suggesting that the amount of preferred microhabitat is an important factor affecting shrimp abundances in the tropical rain-forest streams. The primary-forest reaches were dominated by coarse substrates, such as cobbles and boulders, while a great proportion of the streambeds in the secondary-forest reaches were covered with sand. Owing probably to such habitat differences, the abundance of both A. moluccensis and M. pilimanus, which preferred coarse substrates, was less in the secondary- than in the primary-forest reaches. These suggested that loss of preferred habitat, namely decreased coarse substrate availability, by sedimentation resulting from riparian deforestation had altered the shrimp assemblage structures.

Advances in Understanding Landscape Influences on Freshwater Habitats and Biological Assemblages

2019 ◽  
Keyword(s):  
Forested Wetlands ◽  
Timber Harvest ◽  
Large Wood ◽  
Catchment Scale ◽  
Southeast Alaska ◽  
Riparian Management ◽  
Freshwater Habitats ◽  
Study Sites ◽  
Landscape Attributes ◽  
Landscape Influences

<i>Abstract.</i>—Currently, much is known about influences of landscape attributes, including timber harvest practices, on large wood dynamics in streams. Comparatively, much less is known about influences of catchment attributes on Southeast Alaska streams, in part because of a historical lack of consistent catchment-scale data available for the region. As in forested regions elsewhere, large wood is an important resource to stream habitats and fishes in Southeast Alaska. Therefore, the purpose of this study was to characterize catchment-scale influences, including various timber harvest practices, on large wood in Southeast Alaska stream sites. We delineated local catchment boundaries for all stream reaches in the region and summarized landscape influences, including natural and harvest-related attributes in local and network catchments. Relative amounts of variation in four large wood habitat variables explained by natural versus harvest practice-related landscape attributes were evaluated to compare different influences on 28 randomly selected study sites. We used those results to predict variation in large wood variables from our sites through use of both natural and harvest practice-related catchment attributes to identify those that may be most influential to large wood. Natural characteristics, including catchment area, deciduous forests, forested wetlands, and catchment slope, all had significant influences on large wood variables, as did various measures of contemporary and historical timber harvest practices. We found that large wood length was positively related to conventional harvest after 1990, suggesting the potential effectiveness of contemporary logging regulations in protecting large wood characteristics. In our study, both natural and timber harvest practice-related attributes had measureable influences on stream habitat, underscoring the importance of considering catchment-scale attributes, including riparian management schemes, for managing Southeast Alaska streams.

VOLUME 19, NUMBER 4, JULY 2003 Shrimp abundance and habitat relationships in tropical rain-forest streams, Sarawak, Borneo

2003 ◽  
Vol 19 (05) ◽  
pp. 606 ◽  
Author(s):  
Tomoya Iwata ◽  
Mikio Inoue ◽  
Shigeru Nakano ◽  
Hitoshi Miyasaka ◽  
Atsushi Doi ◽  
...  
Keyword(s):  
Rain Forest ◽  
Tropical Rain Forest ◽  
Forest Streams ◽  
Shrimp Abundance

ABIOTIC CONTROLS ON LONG-TERM WINDTHROW DISTURBANCE AND TEMPERATE RAIN FOREST DYNAMICS IN SOUTHEAST ALASKA

Ecology ◽  
2001 ◽  
Vol 82 (10) ◽  
pp. 2749-2768 ◽  
Author(s):  
Marc G. Kramer ◽  
Andrew J. Hansen ◽  
Mark L. Taper ◽  
Everett J. Kissinger
Keyword(s):  
Forest Dynamics ◽  
Rain Forest ◽  
Southeast Alaska ◽  
Temperate Rain Forest ◽  
Abiotic Controls

Organization of a community of tadpoles in rain forest streams in Borneo

1986 ◽  
Vol 2 (3) ◽  
pp. 193-205 ◽  
Author(s):  
Robert F. Inger ◽  
Harold K. Voris ◽  
Karl J. Frogner
Keyword(s):  
Species Composition ◽  
Rain Forest ◽  
Reproductive Behaviour ◽  
Negative Association ◽  
Intermittent Streams ◽  
Strong Negative Association ◽  
Competitive Relations ◽  
Forest Streams ◽  
A Site ◽  
Behavioural Adaptations

ABSTRACTSamples of 29 distinct larval forms of anurans were collected in streams flowing through primary rain forest at Nanga Tekalit, Sarawak, at three periods spaced over 22 years. This assemblage of tadpoles lives in torrents, riffles, shingle areas, open pools, leaf drifts, protected side pools, potholes in rocky banks, bank seepages, and pools of small intermittent streams. Positive associations of species in types of microhabitats and co-occurrence within sites lead to recognition of four taxonomically heterogeneous groups: one concentrated in leaf drifts; one using riffles, shingle areas, and open pools; one concentrated in potholes; and one using side pools and potholes. Most pairs of larval forms having strong negative association are characterized by differences in morphology and feeding behaviour; they show little evidence of competitive relations. Between-sites variation in species composition differs among the types of microhabitats, leaf drifts showing the least amount of variation. Species composition within a site shows less change over intervals of 1–5 days than over intervals of 13–18 days. Variation in species composition is greater between sites than within sites over intervals of 9–31 days. Organization in this community seems to be effected by three factors: reproductive behaviour of adults and morphological and behavioural adaptations of tadpoles.

Length-weight relationships for 15 fish species from Atlantic rain forest streams, southeastern Brazil

2015 ◽  
Vol 31 (4) ◽  
pp. 809-810 ◽  
Author(s):  
M. R. da Costa ◽  
T. Moreti ◽  
W. Uehara ◽  
H. K. dos Santos ◽  
F. G. Araújo
Keyword(s):  
Fish Species ◽  
Rain Forest ◽  
Southeastern Brazil ◽  
Atlantic Rain Forest ◽  
Forest Streams
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