The importance of night-time observations for determining habitat preferences of stream biota

Johnson, Sherri L.; Covich, Alan P.

doi:10.1002/(sici)1099-1646(200001/02)16:1<91::aid-rrr568>3.0.co;2-v

Cited by 47 publications

(44 citation statements)

References 36 publications

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“…Findings that a freshwater palaemonid and an atyid were nocturnal concur with other reports of these taxa (e.g. Johnson and Covich 2000;Short 2004). Earlyjuvenile-phase M. australasica and G. bispinosus were diurnal, whereas, large fishes ([5 cm) were crepuscular or nocturnal.…”

Section: Discussionsupporting

confidence: 90%

“…That large M. australasica and G. bispinosus were nocturnal, conforms to patterns The current study in conjunction with others highlights the importance of night-time activity of large Australian aquatic fauna and in particular adult phase percichthyids (Pen and Potter 1990;Crook et al 2001;Pusey and Kennard 2001;Ebner and Lintermans 2007;Thiem et al 2008). Consequently, we join Johnson and Covich (2000) in recommending caution when interpreting models of stream habitatuse based exclusively on diurnal surveys (e.g. Maddock et al 2004;Boys and Thoms 2006).…”

Section: Discussionmentioning

confidence: 99%

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In-stream behaviour of threatened fishes and their food organisms based on remote video monitoring

Ebner¹,

Clear²,

Godschalx³

et al. 2008

Aquat Ecol

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Can remote underwater video be used to investigate the in-stream behaviour of small fishes and decapods? Diel activity of two threatened freshwater fishes (Macquaria australasica and Gadopsis bispinosus), a palaemonid prawn and an atyid shrimp, was established from remote underwater video in a pool of an upland stream in the current study. Decapods and large fishes ([5 cm TL) were nocturnal, whereas, small fishes (\5 cm TL) were diurnal. The suitability of using underwater video to quantify short-term (seconds) behavioural interaction among individuals was also demonstrated, with earlyjuvenile-phase Gadopsis bispinosus exhibiting interference competition on 35% of occasions when two or more individuals were observed. This study demonstrates that remote underwater video is useful for observing the in-stream behaviour of threatened freshwater fauna where other techniques are not viable, and presents sub-sampling of video as a means of reducing video processing time in assessing fish diel activity patterns.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

In-stream behaviour of threatened fishes and their food organisms based on remote video monitoring

Ebner¹,

Clear²,

Godschalx³

et al. 2008

Aquat Ecol

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“…To describe diel activity patterns (Helfman 1978;Johnson and Covich 2000;Copp 2008) I established two 1.5 x 3.0 m plots (long axis upstream-downstream), searched them at various times over several days and recorded number and identity of P.acerus and Gastromyzon spp. A dive light was used for night searches.…”

Section: Study Area and Methodsmentioning

confidence: 99%

Comparative habitat use by grazing fishes in a Bornean stream

Sheldon

2011

Environ Biol Fish

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Habitat use by four grazing fishes in a rainforest stream was determined by direct observation (snorkeling) and microhabitat measurements for individual fish. Significant species heterogeneity (P<0.004) occurred along two principal component gradients of velocity, depth and substrate and most pairwise species contrasts were significant. Abundant Paracrossochilus acerus (Cyprinidae) occupied the slower, deeper end of the gradient and Gastromyzon punctulatus (Balitoridae) the fast, shallow end with common G. cranbrooki and rare G. aeroides intermediate. However, overlap was substantial and as many as three species grazed on a single rock with no apparent interaction. All species were primarily dayactive. Incomplete experiments suggest the fishes rapidly abandon rocks with reduced algal cover. Frequent spates with high discharge, turbidity and bedload movement disturbed the river. Disturbance, rather than biotic interactions, may be the dominant factor in the ecology of these fishes.

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“…Previous experimental approaches on day/night changes in aquatic macroinvertebrate assemblages have focused mainly on specific species, such as freshwater crustaceans (Johnson and Covich, 2000;Elliot 2005a), EphemeropteraPlecoptera-Trichoptera taxa (Elliot, 2000(Elliot, , 2002 or gastropods (Lombardo et al, 2010). Likewise, marine and transitional (e.g., Guest et al, 2003) or lentic and temporary ecosystems (Marklund et al, 2001;Florencio et al, 2011) have been previously investigated, but less is known about riverine ecosystems and the entire stream macroinvertebrate community (see Copp et al, 2005, for an example in England).…”

Section: Introductionmentioning

confidence: 99%

Change does not happen overnight: a case study on stream macroinvertebrates

Guareschi

Laini

Fenoglio

et al. 2016

Knowl. Manag. Aquat. Ecosyst.

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-The influence of day/night conditions on individual animal/plant species has been widely studied, but diel cycle studies of the entire stream macroinvertebrate community are extremely rare. This study explored potential dissimilarities between daytime and nighttime macroinvertebrate assemblages by extensive fieldwork conducted in the Lemme stream, a natural water course of NW Italy. Here numerous structural and functional metrics (richness, abundance, biomass, indicator taxa, composition, biomonitoring values and feeding groups) were evaluated at the family level. Small-scale environmental variables were investigated to understand possible differences between macroinvertebrate assemblages in the daytime/nighttime. After collecting and identifying 21 459 organisms of 50 taxa, Chironomidae (Diptera) was the most abundant under both day and night conditions. Our findings stressed that similar results and biological information on daytime/nighttime data were obtained. No marked differences could be related to various factors: heterotrophic condition of small-order streams, presence of aquatic predators under night and day conditions, absence of taxa with a specific phototaxis. Of all the environmental variables, velocity was always the most important in both situations, with some differences detected in the importance of the second variable (riverbed substrate diameter). This research, and future studies on different conditions and geographic areas, will contribute knowledge on stream macroinvertebrate diel activity, and provide useful information about efficient sampling strategies.Key-words: aquatic ecology / diel cycle / lotic systems / aggregation / benthic invertebrates Résumé -Le changement ne survient pas dans une nuit : étude sur la communauté de macro-invertébrés d'un cours d'eau. L'influence des conditions jour/nuit sur les espèces animales et végétales a été largement étudiée, tandis que les études à propos du cycle diurne de l'entier de la communauté des macro-invertébrées fluviales sont extrêmement rares. Dans le cadre de cette étude, les différences potentielles entre les assemblages de macro-invertébrés lors du jour et de la nuit ont été explorées grâce à un travail de terrain très appuyé. L'expérience a été conduite près du Lemme, un cours d'eau naturel situé dans le nord-ouest de l'Italie où des nombreux indicateurs structurels et fonctionnels (richesse, abondance, biomasse, taxons indicateurs, composition, valeurs de biosurveillance et groupes d'alimentation) ont été évalués au niveau Famille. Les variables environnementales à petite échelle ont été évaluées aussi dans le but de comprendre les différences possibles entre les assemblages de macro-invertébrés durant le jour et la nuit. Un total de 21 459 organismes appartenant à 50 taxons ont été collectés et identifiés, montrant que le Chironomidae (Diptera) est le plus présent le jour comme la nuit. Nos trouvailles nous ont montré que des résultats similaires ont été obtenus dans des conditions diurnes comme nocturnes. L'absence de différ...

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The importance of night-time observations for determining habitat preferences of stream biota

Cited by 47 publications

References 36 publications

In-stream behaviour of threatened fishes and their food organisms based on remote video monitoring

In-stream behaviour of threatened fishes and their food organisms based on remote video monitoring

Comparative habitat use by grazing fishes in a Bornean stream

Change does not happen overnight: a case study on stream macroinvertebrates

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