Biology

Articles tagged with the topic ‘Biology’

Displaying 1 - 15 of 15

3089-1

L.R. Griffen, D. Skilling and R.T. Smith with J.G. Young

The 2015 Dumfriesshire Rookery Census: Including comparisons with the surveys of 1908, 1921, 1963, 1973, 1975, 1993, 2003, 2004, 2008 and 2010

Ornithology, Biology

TDGNHAS Series III, 89 (2015), 9(4.65 MB)

Abstract

A total of 13,135 rook nests in 350 rookeries were counted in the 43 parishes of Dumfriesshire in April and May 2015. Although this represents a decrease of 20 rookeries compared to the number recorded in 2010, nest numbers increased by 785 in that period. The average number of nests per rookery increased to 38; something that has not been recorded during either the period of rook population growth from 1921 to 1993 or the period of population decline from 1993 to 2010. For the first time, no rookeries of more than 200 nests were recorded in 2015, the maximum count being 187 nests (cf. 217 in 2010). The number of rookeries containing over 100 nests increased from 20 to 24 from 2010 to 2015 — the first time an increase in this rookery size class has been recorded since 1993. Although it is of concern that the distribution of breeding colonies has again declined, the apparent increase in the breeding population and the cessation of the historic decline is perhaps a cause for optimism regarding the fortunes of the rook in this county.

3079-2

A. Dalton

Preliminary Survey of the Macrophyte Flora of Loch Skeen, Dumfriesshire

Quaternary geology, Biology, Botany

TDGNHAS Series III, 79 (2005), 21(4.05 MB)

Abstract

Loch Skeen (or Skene, NT 171 165) is a moraine dammed loch lying in a NNW/SSE direction in an upland corrie basin. It lies within Grey Mare’s Tail SSSI, owned by the National Trust for Scotland. A description of the site is given by Mackinlay (2003). The

3078-31

N. Chisholm

The River Annan District Salmon Fishery Board River Management

Proceedings, Biology, Zoology

TDGNHAS Series III, 78 (2004), 156(4.91 MB)

Abstract

Summary of a lecture delivered to the Society on 19th March 2004 by Nick Chisholm, Environmental Manager to the River Annan District Salmon Fishery Board. The River Annan is unaffected by hydro-electric power schemes, unlike so many Highland rivers, and i

3021-31

R. Elmhurst

The Seashore

Biology

TDGNHAS Series III, 21 (1936-38), 323(WARNING very large file size: 68.9 MB)

Abstract

Mr Elmhurst gave a most interesting address on the various creatures that may be met with on an ordinary stretch of Scittish west coast seaboard, showing the difference in marine life on sandy, rocky, and other types of shore, and added a short account of

3020-5

J. Taylor

Genetics:The Science of Heredity [Summary only]

Biology

TDGNHAS Series III, 20 (1935-36), 35(WARNING very large file size: 60.71 MB)

Abstract

The lecturer described the discoveries of Mendel and some of his experiments in detail, and then explained briefly the principles of cell structure and the transmission of certain characteristics, e.g., sex.
The lecture was fully illustrated by diagrams