title: Comparative boat electrofishing surveys of Lake Waahi in 2007 and 2011

authors: Tempero, Grant Wayne

abstract: We conducted boat electrofishing surveys of Lake Waahi, which is located to the west of Huntly and flows into the Waikato River. The purpose of this was to repeat surveys that took place on 7 March 2007 and 26 March 2011 concerning the density and distribution pattern fish species within the lake. Due to wind and possibly low water clarity, catch rates were lower in 2011 than those found in 2007 as we only caught 108 fish in 2011 compared to 493 in 2007. Species composition included three native species and five introduced species. Native species caught were common smelt, common bully and shortfin eel and introduced species were perch, rudd, goldfish, catfish and koi carp, gambusia were also sighted but not captured.

text: Comparative boat electrofishing surveys of Lake Waahi in 2007 and 2011 We conducted boat electrofishing surveys of Lake Waahi, which is located to the west of Huntly and flows into the Waikato River. The purpose of this was to repeat surveys that took place on 7 March 2007 and 26 March 2011 concerning the density and distribution pattern fish species within the lake. Due to wind and possibly low water clarity, catch rates were lower in 2011 than those found in 2007 as we only caught 108 fish in 2011 compared to 493 in 2007. Species composition included three native species and five introduced species. Native species caught were common smelt, common bully and shortfin eel and introduced species were perch, rudd, goldfish, catfish and koi carp, gambusia were also sighted but not captured.

year: 2011-05-05

title: Testing the synchroneity of pollen signals using tephrostratigraphy

authors: Newnham, Rewi M.

subjects: pollen signals

abstract: Since the advent of radiocarbon dating, the concept of synchronous pollen-vegetation events extending across broad regions such as the British Isles, which had emerged from earlier pollen-stratigraphic studies, has been largely refuted. Nevertheless the assumption that pollen profiles within a geographically coherent area should exhibit broadly comparable and synchronous pollen signals still holds currency among some palynologists. This assumption is tested here by comparing pollen spectra between lateglacial and postglacial sites in northern New Zealand, until recently unaffected by human activity, where independent correlations are obtained by tephrochronology. At sites of similar size, morphology, and depositional environment within the same phytogeomorphic region, it is possible to achieve accurate palynological correlations, provided local taxa and those representing ecologically disparate source species are omitted from the pollen datasets. However, anomalous correlations may still occur and are more likely when sites with different depositional environments or at greater distances are compared. These results suggest that the concept of synchronous pollen signals, even between nearby sites with similar depositional setting, is not universally applicable and it is possible that erroneous palynostratigraphic correlations have been made in the past.

text: Testing the synchroneity of pollen signals using tephrostratigraphy Since the advent of radiocarbon dating, the concept of synchronous pollen-vegetation events extending across broad regions such as the British Isles, which had emerged from earlier pollen-stratigraphic studies, has been largely refuted. Nevertheless the assumption that pollen profiles within a geographically coherent area should exhibit broadly comparable and synchronous pollen signals still holds currency among some palynologists. This assumption is tested here by comparing pollen spectra between lateglacial and postglacial sites in northern New Zealand, until recently unaffected by human activity, where independent correlations are obtained by tephrochronology. At sites of similar size, morphology, and depositional environment within the same phytogeomorphic region, it is possible to achieve accurate palynological correlations, provided local taxa and those representing ecologically disparate source species are omitted from the pollen datasets. However, anomalous correlations may still occur and are more likely when sites with different depositional environments or at greater distances are compared. These results suggest that the concept of synchronous pollen signals, even between nearby sites with similar depositional setting, is not universally applicable and it is possible that erroneous palynostratigraphic correlations have been made in the past.

year: 1999

title: Biological flora of New Zealand 11. Eleochairs spacelata, kuta, paopao, bamboo spike sedge.

authors: Kapa, Mieke M

subjects: cultural

abstract: Information relevant to the ecology and morphology of Eleocharis sphacelata (Cyperaceae) available through published and unpublished sources is assembled and reviewed. Eleocharis sphacelata is a freshwater wetland sedge found growing at the edge of lake margins, swamps, lagoons, and bogs within New Zealand, Australia, and Papua New Guinea. It is a perennial rhizomatous herb, with tall green cylindrical culms rising from submerged rhizomes generally buried under water in aerobic soils. A tendency to dominate the deepwater margins makes E. sphacelata crucial to the ecology of this habitat as a source of food, shelter, and protection for invertebrates, birds, and fish. Eleocharis sphacelata is commonly named giant spike-rush, kuta, or paopao. Māori have traditionally used the plant for clothing and warm coverings within whare (houses). Recent interest comes from its use in restoration plantings and constructed wetlands.

text: Biological flora of New Zealand 11. Eleochairs spacelata, kuta, paopao, bamboo spike sedge. Information relevant to the ecology and morphology of Eleocharis sphacelata (Cyperaceae) available through published and unpublished sources is assembled and reviewed. Eleocharis sphacelata is a freshwater wetland sedge found growing at the edge of lake margins, swamps, lagoons, and bogs within New Zealand, Australia, and Papua New Guinea. It is a perennial rhizomatous herb, with tall green cylindrical culms rising from submerged rhizomes generally buried under water in aerobic soils. A tendency to dominate the deepwater margins makes E. sphacelata crucial to the ecology of this habitat as a source of food, shelter, and protection for invertebrates, birds, and fish. Eleocharis sphacelata is commonly named giant spike-rush, kuta, or paopao. Māori have traditionally used the plant for clothing and warm coverings within whare (houses). Recent interest comes from its use in restoration plantings and constructed wetlands.

year: 2009