An Investigation of the Distribution of the Mayfly Fauna of a Lancashire Stream

Harker, Janet E.

doi:10.2307/1686

Cited by 36 publications

(18 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Early summer emergence of Macronematinae could also result from selective pressure to reduce spate-induced mortality of late-instar larvae and pupae during the summer wet season. Declines in benthic macroinvertebrate abundance have been associated with spates elsewhere in Asia (Bishop, 1973;Bright, 1982), and Harker (1953) records that large mayflies are more likely to be damaged and crushed by rolling stones during spates than are small larvae. Even if reduction of pre-emergence mortality is the ultimate selective pressure leading to early summer emergence of Macronematinae, rising water temperature could still serve as a proximal cue.…”

Section: Discussionmentioning

confidence: 99%

Flight periods of aquatic insects from a Hong Kong forest stream i. Macronematinae (Hydropsychidae) and stenopsychidae (Trichoptera)

Dudgeon

1988

Aquatic Insects

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Flight periods of aquatic insects from a Hong Kong forest stream i. Macronematinae (Hydropsychidae) and stenopsychidae (Trichoptera)

Dudgeon

1988

Aquatic Insects

View full text Add to dashboard Cite

“…We found that Hydrophilidae (positively) and Trichoptera (negatively) were influenced by increasing coarseness of substrate, and Culicidae (negatively) by increasing proportion of the area occupied by aquatic macrophytes. Harker (1953) demonstrated that the relative abundances of certain species of Ephemeroptera in a stream corresponded to the relative depths of the localities. In our study, Macrobrachium occurred in greater numbers when the sampled habitat was deeper, but connection depth influenced Chironomidae (positively), Insecta pupae (positively), and Macrobrachium (negatively).…”

Section: Significance Of the Descriptors In The Polluted And Unpollutmentioning

confidence: 97%

Mining Pollution and the Diet of the Purple‐Striped Gudgeon Mogurnda mogurnda Richardson (Eleotridae) in the Finniss River, Northern Territory, Australia

Jeffree¹,

Williams²

1980

Ecological Monographs

View full text Add to dashboard Cite

During the dry season of 1974, collections of the purple—striped gudgeon Mogurnda mogurnda were taken from the Finniss River of the Northern Territory; during the wet season, this river receives acidic and metallic pollutants from the formerly mined area of Rum Jungle. The fish consumed a great variety of foods, with high abundances of Dytiscidae, Chironomidae, Ceratopogonidae, Trichoptera, Odonata, Copepoda, Decapoda, and Pisces. Within polluted and unpolluted zones of the river; the dietary abundances of some foods varied with the size of the consuming fish and with habitat descriptors. For no food was there a significant regression against habitat descriptors in both of the zones; this emphasizes that pollution effects are more complex than simply depression or raising the abundances of the dietary species. Five foods were more abundant in the diets of the polluted zone, and three in those of the unpolluted zone. The dietary abundances of two foods, both crustacean, increased in the polluted zone, compared to the unpolluted zone, through the dry season. Two categories of foods: (1) those obtaining oxygen directly from the atmosphere or via a film or bubble of air; and (2) the converse set (aquatic respirers), were contrasted for their usefulness in distinguishing between the zones, by both hierarchical agglomerative and discriminant function analyses. Aquatic respirers were the more effective. The polluted collections were more heterogeneous than the unpolluted ones in both the hierarchical and the discriminant analyses. One collection from the polluted zone was reclassified as unpolluted on the basis of its grouping behavior. The relevance for pollution studies of dietary analysis of euryphagous fish, rather than sampling aquatic fauna directly, is discussed in terms of food substitution, switching, strategies for abundance and recovery by the fauna, and possibly effects of the pollutants on the fish as an intervening collector. Downstream patterns of abundance of the invertebrate fauna in this study are broadly similar to those of other studies in which such chemically diverse metals as Pb, Zn, and Cu are the pollutants, but there are differences for some faunal components. Difficulties in the comparison and causal interpretation of results of pollution studies in the field stem from a lack of experimental data on tolerances to pollutants and causes of abundance of stream invertebrates. However, because of the great detail required in such data, more profit for purposes of prediction may derive from experimental multivariate studies on faunal assemblages.

show abstract

“…Die abfallende Aktivit/~t w~ihrend der ersten 5 Tage nach Einsetzen yon Ecdyonurus venosus in die Versuchsrinne, yon der BuTz [11] berichtet und die wir in den ersten Experimenten ebenfalls gefunden haben, lassen sich mindestens teilweise auf Temperaturschocks zuriickffihren. Auch HARmSR [35] berichtet yon vielen zerquetschten Larven, unter anderem von E. torre~ttis, als Folge eines Hochwassers. 2.5).…”

Section: Driflbeeinflussende Faktorenunclassified

The drift and its ecological significance. Experimental investigation onEcdyonurus venosus (Fabr.) in a stream model

Keller¹

1975

Schweiz. Z. Hydrologie

View full text Add to dashboard Cite

The Drift and its Ecological Significance. Expe~mental Investigation on Ecdyonurus venosus (Fabr.) in a Stream ModelWith one-factor experiments, the drift of larvae of Ecdyonurus venosus has been analysed in a stream model. The distances travelled by drifting animals as a function of water velocity have been determined, as well as some drift rhythms. Drift-inducing factors are principally scarecity of food (lack of periphyton) and movement of substrate. Induction of drift by small water velocities can be caused by insufficient oxygen supply. The typical drift minimum during the final larval instar is said to be caused by a pseudo-pupal stage. After temperature shocks of -4-5 oC respectively, the animals acclimate within 2 days. An increase in temperature induces a decrease in drift reates and vice versa. Sex, predation and competition do not influence drift. The mean flight range of the imagoes (flight-mill) is 2,794 m, the maximum upstream movement of the larvae 140 m/24 h.

show abstract

An Investigation of the Distribution of the Mayfly Fauna of a Lancashire Stream

Cited by 36 publications

References 5 publications

Flight periods of aquatic insects from a Hong Kong forest stream i. Macronematinae (Hydropsychidae) and stenopsychidae (Trichoptera)

Flight periods of aquatic insects from a Hong Kong forest stream i. Macronematinae (Hydropsychidae) and stenopsychidae (Trichoptera)

Mining Pollution and the Diet of the Purple‐Striped Gudgeon Mogurnda mogurnda Richardson (Eleotridae) in the Finniss River, Northern Territory, Australia

The drift and its ecological significance. Experimental investigation onEcdyonurus venosus (Fabr.) in a stream model

Contact Info

Product

Resources

About