A Structured Approach for Developing Indices of Biotic Integrity: Three Examples from Streams and Rivers in the Western USA Tập 136 Số 3 - Trang 718-735 - 2007
Thomas R. Whittier, Robert M. Hughes, John L. Stoddard, Gregg A. Lomnicky, David V. Peck, Alan T. Herlihy
AbstractIn the late 1990s the Environmental Monitoring and Assessment Program of
the U.S. Environmental Protection Agency developed a structured set of tests to
evaluate and facilitate selection of metrics for indices of biotic integrity
(IBIs). These IBIs were designed to be applicable across multistate regions as
part of a national assessment of all U.S. waters. Here, we present additional
steps... hiện toàn bộ
Sound Production by Atlantic Cod during Spawning Tập 135 Số 2 - Trang 529-538 - 2006
Sherrylynn Rowe, Jeffrey A. Hutchings
AbstractUsing captive groups of Atlantic cod Gadus morhua from two Northwest
Atlantic populations (western Scotian Shelf and southern Gulf of St. Lawrence),
we quantified the temporal patterns and behavioral contexts of sound production
during the spawning season. We found that sound production occurs most
frequently during the peak of the spawning period, particularly after the onset
of darkness.... hiện toàn bộ
Long‐Term Residence of Red Snapper on Artificial Reefs in the Northeastern Gulf of Mexico Tập 134 Số 2 - Trang 315-325 - 2005
Stephen T. Szedlmayer, Rebecca L. Schroepfer
AbstractRed snapper Lutjanus campechanus (N = 54) were tagged and tracked on 12
artificial reefs in the northeastern Gulf of Mexico. Fish were surgically
implanted with ultrasonic transmitters and monitored with Vemco remote receivers
and Sonotronics surface receivers from August 2000 to 2004. Four fish were
manually tracked from the surface overnight, and their positions were recorded
every hour ... hiện toàn bộ
A Revised Alverson and Carney Model for Estimating the Instantaneous Rate of Natural Mortality Tập 135 Số 3 - Trang 620-633 - 2006
Chang‐Ik Zhang, Bernard A. Megrey
AbstractThe Alverson and Carney (AC) model for estimating the instantaneous rate
of natural mortality (M) was reformulated to include β andt0parameters. The
revised Zhang and Megrey (ZM) model could be used for the estimation ofMinstead
of the AC model since von Bertalanffy and allometric growth parameters are
readily available for most exploited fish stocks. It was determined from the new
formula... hiện toàn bộ
Fine‐Scale Movements and Home Ranges of Red Snapper around Artificial Reefs in the Northern Gulf of Mexico Tập 143 Số 4 - Trang 988-998 - 2014
Maria N. Piraino, Stephen T. Szedlmayer
AbstractRed Snapper Lutjanus campechanus are generally associated with
artificial reef habitats in the northern Gulf of Mexico, but whether this
association results in fish production is still controversial. Information on
fine‐scale habitat use patterns would be helpful in evaluating this. Little is
known about the fine‐scale movement patterns of Red Snapper around artificial
reefs. The present s... hiện toàn bộ
Diel Feeding Patterns of Red Snapper on Artificial Reefs in the North‐Central Gulf of Mexico Tập 132 Số 6 - Trang 1186-1193 - 2003
Allyson Clair Ouzts, Stephen T. Szedlmayer
AbstractDiets of red snapper Lutjanus campechanus were compared among four diel
feeding periods (dawn, day, dusk, and night) and among three standard length
size‐classes: small (200–299 mm), medium (300–399 mm), and large (400–499 mm).
Fish were collected from August through October 2000 in the north‐central Gulf
of Mexico. A total of 432 stomachs were examined, of which 164 (37%) contained
prey. ... hiện toàn bộ
Do Beaver Dams Impede the Movement of Trout? Tập 142 Số 4 - Trang 1114-1125 - 2013
Ryan L. Lokteff, Brett B. Roper, Joseph M. Wheaton
AbstractDams created by North American beavers Castor canadensis (hereafter,
“beavers”) have numerous effects on stream habitat use by trout. Many of these
changes to the stream are seen as positive, and many stream restoration projects
seek either to reintroduce beavers or to mimic the habitat that they create. The
extent to which beaver dams act as movement barriers to salmonids and whether
succ... hiện toàn bộ
Red Snapper Reproductive Biology in the Southern Gulf of Mexico Tập 139 Số 4 - Trang 957-968 - 2010
Thierry Brulé, Teresa Colás‐Marrufo, Esperanza Pérez‐Díaz, Juan Carlos Sámano‐Zapata
AbstractSex ratio, size at maturity, reproductive periodicity, ovarian
development pattern, and spawning ground data for red snapper Lutjanus
campechanus from the southern Gulf of Mexico were analyzed to understand this
species' reproductive biology throughout its geographical distribution. Red
snapper were sampled in 1999 and 2000 from commercial fishery catches taken on
Campeche Bank at depths r... hiện toàn bộ