Microhabitat preferences of benthic invertebrates and the development of generalisedDeleatidiumspp. habitat suitability curves, applied to four New Zealand rivers

Abstract

(1991) Microhabitat preferences of benthic invertebrates and the development of generalised Deleatidium spp. habitat suitability curves, applied to four New Zealand rivers, New Zealand Journal of Marine and Freshwater Research, 25:2, 187-199, DOI: 10.1080/00288330.1991 Marine and Freshwater Research, 1991, Vol. 25: 187-199 0028-8330/2502- velocities, Potamopyrgus antipodarum and Chironomidae low to moderate velocities (0.0-0.75 m s -1 ), and all three were associated with a broad range of substrates. Deleatidium spp., Olingaferedayi, Hydrobiosidae, and Aphrophila neozelandica were found in a wide range of habitats. Velocity, depth, and substrate suitability curves developed for Deleatidium in each of the four rivers also demonstrated the broad habitat tolerances of this genus. Generalised suitability curves formed by enveloping, rather than averaging, curves from each of the rivers performed favourably when compared to models based on suitability curves developed for each river individually. Correlations between Deleatidium abundance and the joint suitability function, calculated from the generalised velocity, depth, and substrate curves, were significant but poor (r = 0.44-0.69) in each of the four rivers. The intercepts of the linear relationships between Deleatidium abundance and the joint preference factor were not significantly different from zero for three of the four rivers, suggesting that the preference functions are applicable to in-stream flow assessments.

Effects of hydraulic conditions and larval size on the microdistribution of Hydrobiosidae (Trichoptera) in two New Zealand rivers

“…The relatively high mobility of the larvae may enable them to adjust to rapidly changing hydraulic conditions in a river, and they might therefore be expected to exhibit strong relationships with hydraulic variables. However, Jowett et al (1991) found that, as a group, Hydrobiosidae larvae exhibited broad velocity and substrate preferences. The aim of the present study was to characterise the hydraulic conditions utilised by different Hydrobiosidae taxa in two New Zealand rivers, and to investigate whether species-or size-related variations in microdistribution occurred.…”

“…Hydraulic conditions may influence invertebrates directly, for example through the effects of lift and drag forces (Statzner 1988;Weissenberger et al 1991), and indirectly through the effects of water velocity on substrate particle size (Jowett et al 1991 ) and potential food supplies (e.g., periphyton : Biggs & Hickey 1994). Some groups of benthic invertebrates exhibit well-defined velocity preferences whereas others appear to be abundant over a wide range of conditions (Edington 1968;Gore 1978;Jowett et al 1991).…”

“…Hydraulic conditions may influence invertebrates directly, for example through the effects of lift and drag forces (Statzner 1988;Weissenberger et al 1991), and indirectly through the effects of water velocity on substrate particle size (Jowett et al 1991 ) and potential food supplies (e.g., periphyton : Biggs & Hickey 1994). Some groups of benthic invertebrates exhibit well-defined velocity preferences whereas others appear to be abundant over a wide range of conditions (Edington 1968;Gore 1978;Jowett et al 1991). Animals that are able to live successfully at high current velocities may do so by seeking refuge from drag in sublayers within the boundary layer (Vogel 1981;Statzner & Holm 1982), by modifying body orientation and posture (e.g., Weissenberger et al 1991), or by possessing specialised adaptations such as the suckers of Blephariceridae (Anderson & Wallace 1984), the large, sucker-like gills of some mayflies (Collier 1994), and the construction of heavier cases in some caddisflies (Webster & Webster 1943).…”

Réponses globales des invertébrés benthiques aux conditions d'habitat physique dans des cours d'eau salmonicoles : perspectives d'intégration dans des modèles habitat/poissons

“…Des courbes de préférence d'habitat ont été développés pour certaines espèces (GORE et JUDY, 1981 ;ORTH et MAUGHAN, 1983 ;MORIN et al, 1986 ;JOWETT et RICHARDSON, 1990 ;COTTA-RAMUSINO et al, 1991 ;JOWETT et al, 1991 ;COLLIER, 1993). Des modèles reliant les invertébrés à la distribution statistique des forces tractrices ont également été proposés (STATZNER et al, 1988).…”

Influence du compartiment trophique dans les réponses des populations de poissons aux variations artificielles de débit

“…In another natural expehment, five-to-ten fold increases in maximum summer invertebrate densities were observed in wet years (SCHLOSSER and EBEL, 1989) ; increases in blackfiies and net-spinning caddisfiies were attributed to increased velocity and organic matter input. Characterization of the required hydraulic conditions has been done for several insects (OSBORNE and HERRICKS, 1987 ;GORE, 1989 ;WETMORE et al, 1990 ;JOWETT et al, 1991). Net-spinning caddisfiies are more efficient at foraging under certain velocity conditions (GEORGIAN and THORP, 1992), which suggests one mechanism to partially explain observed variations.…”