caa a22 4500 469074582 CHVBK 20180323132931.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00129706 doi (NATIONALLICENCE)springer-10.1007/BF00129706 Effects of changing spatial scale on acoustic observations of patchiness in the Gulf Stream [Elektronische Daten] [R. Nero, J. Magnuson] We examine the influence of spatial scale on studies of nektonic patchiness at the north edge of the Gulf Stream by altering the grain size of acoustic cross sections and applying a patch-finding algorithm. From original ‘pictures' of 180 pixels deep by 540-1260 pixels long, we averaged depth and length, to give 9 scales ranging from fine grain (1 m vertical × 25 m horizontal sized pixels) to coarse grain (12 m × 300 m sized pixels). Measures of overall echo intensity within patches were the most predictable and showed little change with scale. Measures of variability of the echo within patches showed simple negative trends with scale and were best measured at fine spatial scales. Patch size and shape related variables have a more complex relationship with scale with differences between day and night transects more pronounced at intermediate scales. This suggests behavioral patch forming mechanisms within the nekton occur at a specific grain size (4 m vertical × 100 m horizontal) within the Gulf Stream front. SPB Academic Publishing bv, 1992 patchiness nationallicence nekton nationallicence Gulf Stream nationallicence acoustics nationallicence scale nationallicence Nero R. Center for Limnology, 680 North Park St., WI 53706, Madison, USA aut Magnuson J. Center for Limnology, 680 North Park St., WI 53706, Madison, USA aut Landscape Ecology Kluwer Academic Publishers 6/4(1992-03-01), 279-291 0921-2973 6:4<279 1992 6 10980 https://doi.org/10.1007/BF00129706 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00129706 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nero R. Center for Limnology, 680 North Park St., WI 53706, Madison, USA aut NATIONALLICENCE 700 1- Magnuson J. Center for Limnology, 680 North Park St., WI 53706, Madison, USA aut NATIONALLICENCE 773 0- Landscape Ecology Kluwer Academic Publishers 6/4(1992-03-01), 279-291 0921-2973 6:4<279 1992 6 10980 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer